fo mi [email protected]

FOMi-40High-Speed Fiber Optic Modem

with Remote Control

Version 1.0

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Innovative Access Solutions

FOMi-40 High-Speed Fiber Optic Modem with Remote Control

Version 1.0

Installation and Operation Manual

Notice

This manual contains information that is proprietary to RAD Data Communications Ltd. ("RAD"). No part of this publication may be reproduced in any form whatsoever without prior written approval by RAD Data Communications.

Right, title and interest, all information, copyrights, patents, know-how, trade secrets and other intellectual property or other proprietary rights relating to this manual and to the FOMi-40 and any software components contained therein are proprietary products of RAD protected under international copyright law and shall be and remain solely with RAD.

FOMi-40 is a registered trademark of RAD. No right, license, or interest to such trademark is granted hereunder, and you agree that no such right, license, or interest shall be asserted by you with respect to such trademark.

You shall not copy, reverse compile or reverse assemble all or any portion of the Manual or the FOMi-40. You are prohibited from, and shall not, directly or indirectly, develop, market, distribute, license, or sell any product that supports substantially similar functionality as the FOMi-40, based on or derived in any way from the FOMi-40. Your undertaking in this paragraph shall survive the termination of this Agreement.

This Agreement is effective upon your opening of the FOMi-40 package and shall continue until terminated. RAD may terminate this Agreement upon the breach by you of any term hereof. Upon such termination by RAD, you agree to return to RAD the FOMi-40 and all copies and portions thereof.

For further information contact RAD at the address below or contact your local distributor.

International Headquarters RAD Data Communications Ltd.

24 Raoul Wallenberg Street Tel Aviv 69719, Israel Tel: 972-3-6458181 Fax: 972-3-6498250, 6474436 E-mail: [email protected]

North America Headquarters RAD Data Communications Inc.

900 Corporate Drive Mahwah, NJ 07430, USA Tel: (201) 5291100, Toll free: 1-800-4447234 Fax: (201) 5295777 E-mail: [email protected]

© 1987–2007 RAD Data Communications Ltd. Publication No. 315-200-04/07

mailto:[email protected]


Limited Warranty

RAD warrants to DISTRIBUTOR that the hardware in the FOMi-40 to be delivered hereunder shall be free of defects in material and workmanship under normal use and service for a period of twelve (12) months following the date of shipment to DISTRIBUTOR.

If, during the warranty period, any component part of the equipment becomes defective by reason of material or workmanship, and DISTRIBUTOR immediately notifies RAD of such defect, RAD shall have the option to choose the appropriate corrective action: a) supply a replacement part, or b) request return of equipment to its plant for repair, or c) perform necessary repair at the equipment's location. In the event that RAD requests the return of equipment, each party shall pay one-way shipping costs.

RAD shall be released from all obligations under its warranty in the event that the equipment has been subjected to misuse, neglect, accident or improper installation, or if repairs or modifications were made by persons other than RAD's own authorized service personnel, unless such repairs by others were made with the written consent of RAD.

The above warranty is in lieu of all other warranties, expressed or implied. There are no warranties which extend beyond the face hereof, including, but not limited to, warranties of merchantability and fitness for a particular purpose, and in no event shall RAD be liable for consequential damages.

RAD shall not be liable to any person for any special or indirect damages, including, but not limited to, lost profits from any cause whatsoever arising from or in any way connected with the manufacture, sale, handling, repair, maintenance or use of the FOMi-40, and in no event shall RAD's liability exceed the purchase price of the FOMi-40.

DISTRIBUTOR shall be responsible to its customers for any and all warranties which it makes relating to FOMi-40 and for ensuring that replacements and other adjustments required in connection with the said warranties are satisfactory.

Software components in the FOMi-40 are provided "as is" and without warranty of any kind. RAD disclaims all warranties including the implied warranties of merchantability and fitness for a particular purpose. RAD shall not be liable for any loss of use, interruption of business or indirect, special, incidental or consequential damages of any kind. In spite of the above RAD shall do its best to provide error-free software products and shall offer free Software updates during the warranty period under this Agreement.

RAD's cumulative liability to you or any other party for any loss or damages resulting from any claims, demands, or actions arising out of or relating to this Agreement and the FOMi-40 shall not exceed the sum paid to RAD for the purchase of the FOMi-40. In no event shall RAD be liable for any indirect, incidental, consequential, special, or exemplary damages or lost profits, even if RAD has been advised of the possibility of such damages.

This Agreement shall be construed and governed in accordance with the laws of the State of Israel.

Product Disposal

To facilitate the reuse, recycling and other forms of recovery of waste equipment in protecting the environment, the owner of this RAD product is required to refrain from disposing of this product as unsorted municipal waste at the end of its life cycle. Upon termination of the unit’s use, customers should provide for its collection for reuse, recycling or other form of environmentally conscientious disposal.

General Safety Instructions

The following instructions serve as a general guide for the safe installation and operation of telecommunications products. Additional instructions, if applicable, are included inside the manual.

Safety Symbols

This symbol may appear on the equipment or in the text. It indicates potential safety hazards regarding product operation or maintenance to operator or service personnel.

Danger of electric shock! Avoid any contact with the marked surface while the product is energized or connected to outdoor telecommunication lines.

Protective earth: the marked lug or terminal should be connected to the building protective earth bus.

Some products may be equipped with a laser diode. In such cases, a label with the laser class and other warnings as applicable will be attached near the optical transmitter. The laser warning symbol may be also attached.

Please observe the following precautions:

• Before turning on the equipment, make sure that the fiber optic cable is intact and is connected to the transmitter.

• Do not attempt to adjust the laser drive current.

• Do not use broken or unterminated fiber-optic cables/connectors or look straight at the laser beam.

• The use of optical devices with the equipment will increase eye hazard.

• Use of controls, adjustments or performing procedures other than those specified herein, may result in hazardous radiation exposure.

ATTENTION: The laser beam may be invisible!

In some cases, the users may insert their own SFP laser transceivers into the product. Users are alerted that RAD cannot be held responsible for any damage that may result if non-compliant transceivers are used. In particular, users are warned to use only agency approved products that comply with the local laser safety regulations for Class 1 laser products.

Always observe standard safety precautions during installation, operation and maintenance of this product. Only qualified and authorized service personnel should carry out adjustment, maintenance or repairs to this product. No installation, adjustment, maintenance or repairs should be performed by either the operator or the user.

Warning

Warning

Handling Energized Products

General Safety Practices

Do not touch or tamper with the power supply when the power cord is connected. Line voltages may be present inside certain products even when the power switch (if installed) is in the OFF position or a fuse is blown. For DC-powered products, although the voltages levels are usually not hazardous, energy hazards may still exist.

Before working on equipment connected to power lines or telecommunication lines, remove jewelry or any other metallic object that may come into contact with energized parts.

Unless otherwise specified, all products are intended to be grounded during normal use. Grounding is provided by connecting the mains plug to a wall socket with a protective earth terminal. If an earth lug is provided on the product, it should be connected to the protective earth at all times, by a wire with a diameter of 18 AWG or wider. Rack-mounted equipment should be mounted only in earthed racks and cabinets.

Always make the ground connection first and disconnect it last. Do not connect telecommunication cables to ungrounded equipment. Make sure that all other cables are disconnected before disconnecting the ground.

Connecting AC Mains

Make sure that the electrical installation complies with local codes.

Always connect the AC plug to a wall socket with a protective ground.

The maximum permissible current capability of the branch distribution circuit that supplies power to the product is 16A. The circuit breaker in the building installation should have high breaking capacity and must operate at short-circuit current exceeding 35A.

Always connect the power cord first to the equipment and then to the wall socket. If a power switch is provided in the equipment, set it to the OFF position. If the power cord cannot be readily disconnected in case of emergency, make sure that a readily accessible circuit breaker or emergency switch is installed in the building installation.

In cases when the power distribution system is IT type, the switch must disconnect both poles simultaneously.

Connecting DC Power

Unless otherwise specified in the manual, the DC input to the equipment is floating in reference to the ground. Any single pole can be externally grounded.

Due to the high current capability of DC power systems, care should be taken when connecting the DC supply to avoid short-circuits and fire hazards.

DC units should be installed in a restricted access area, i.e. an area where access is authorized only to qualified service and maintenance personnel.

Make sure that the DC power supply is electrically isolated from any AC source and that the installation complies with the local codes.

The maximum permissible current capability of the branch distribution circuit that supplies power to the product is 16A. The circuit breaker in the building installation should have high breaking capacity and must operate at short-circuit current exceeding 35A.

Before connecting the DC supply wires, ensure that power is removed from the DC circuit. Locate the circuit breaker of the panel board that services the equipment and switch it to the OFF position. When connecting the DC supply wires, first connect the ground wire to the corresponding terminal, then the positive pole and last the negative pole. Switch the circuit breaker back to the ON position.

A readily accessible disconnect device that is suitably rated and approved should be incorporated in the building installation.

If the DC power supply is floating, the switch must disconnect both poles simultaneously.

Connecting Data and Telecommunications Cables

Data and telecommunication interfaces are classified according to their safety status.

The following table lists the status of several standard interfaces. If the status of a given port differs from the standard one, a notice will be given in the manual.

Ports Safety Status

V.11, V.28, V.35, V.36, RS-530, X.21, 10 BaseT, 100 BaseT, Unbalanced E1, E2, E3, STM, DS-2, DS-3, S-Interface ISDN, Analog voice E&M

SELV Safety Extra Low Voltage:

Ports which do not present a safety hazard. Usually up to 30 VAC or 60 VDC.

xDSL (without feeding voltage), Balanced E1, T1, Sub E1/T1

TNV-1 Telecommunication Network Voltage-1:

Ports whose normal operating voltage is within the limits of SELV, on which overvoltages from telecommunications networks are possible.

FXS (Foreign Exchange Subscriber) TNV-2 Telecommunication Network Voltage-2:

Ports whose normal operating voltage exceeds the limits of SELV (usually up to 120 VDC or telephone ringing voltages), on which overvoltages from telecommunication networks are not possible. These ports are not permitted to be directly connected to external telephone and data lines.

FXO (Foreign Exchange Office), xDSL (with feeding voltage), U-Interface ISDN

TNV-3 Telecommunication Network Voltage-3:

Ports whose normal operating voltage exceeds the limits of SELV (usually up to 120 VDC or telephone ringing voltages), on which overvoltages from telecommunication networks are possible.

Always connect a given port to a port of the same safety status. If in doubt, seek the assistance of a qualified safety engineer.

Always make sure that the equipment is grounded before connecting telecommunication cables. Do not disconnect the ground connection before disconnecting all telecommunications cables.

Some SELV and non-SELV circuits use the same connectors. Use caution when connecting cables. Extra caution should be exercised during thunderstorms.

When using shielded or coaxial cables, verify that there is a good ground connection at both ends. The earthing and bonding of the ground connections should comply with the local codes.

The telecommunication wiring in the building may be damaged or present a fire hazard in case of contact between exposed external wires and the AC power lines. In order to reduce the risk,

there are restrictions on the diameter of wires in the telecom cables, between the equipment and the mating connectors.

To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cords.

Pour réduire les risques s’incendie, utiliser seulement des conducteurs de télécommunications 26 AWG ou de section supérieure.

Some ports are suitable for connection to intra-building or non-exposed wiring or cabling only. In such cases, a notice will be given in the installation instructions.

Do not attempt to tamper with any carrier-provided equipment or connection hardware.

Electromagnetic Compatibility (EMC) The equipment is designed and approved to comply with the electromagnetic regulations of major regulatory bodies. The following instructions may enhance the performance of the equipment and will provide better protection against excessive emission and better immunity against disturbances.

A good earth connection is essential. When installing the equipment in a rack, make sure to remove all traces of paint from the mounting points. Use suitable lock-washers and torque. If an external grounding lug is provided, connect it to the earth bus using braided wire as short as possible.

The equipment is designed to comply with EMC requirements when connecting it with unshielded twisted pair (UTP) cables. However, the use of shielded wires is always recommended, especially for high-rate data. In some cases, when unshielded wires are used, ferrite cores should be installed on certain cables. In such cases, special instructions are provided in the manual.

Disconnect all wires which are not in permanent use, such as cables used for one-time configuration.

The compliance of the equipment with the regulations for conducted emission on the data lines is dependent on the cable quality. The emission is tested for UTP with 80 dB longitudinal conversion loss (LCL).

Unless otherwise specified or described in the manual, TNV-1 and TNV-3 ports provide secondary protection against surges on the data lines. Primary protectors should be provided in the building installation.

The equipment is designed to provide adequate protection against electro-static discharge (ESD). However, it is good working practice to use caution when connecting cables terminated with plastic connectors (without a grounded metal hood, such as flat cables) to sensitive data lines. Before connecting such cables, discharge yourself by touching earth ground or wear an ESD preventive wrist strap.

Caution

Attention

FCC-15 User Information

This equipment has been tested and found to comply with the limits of the Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the Installation and Operation manual, may cause harmful interference to the radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Canadian Emission Requirements

This Class A digital apparatus meets all the requirements of the Canadian Interference-Causing Equipment Regulation.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

Warning per EN 55022 (CISPR-22)

This is a class A product. In a domestic environment, this product may cause radio interference, in which case the user will be required to take adequate measures.

Cet appareil est un appareil de Classe A. Dans un environnement résidentiel, cet appareil peut provoquer des brouillages radioélectriques. Dans ces cas, il peut être demandé à l’utilisateur de prendre les mesures appropriées.

Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses Gerätes Rundfunkströrungen auftreten, in welchen Fällen der Benutzer für entsprechende Gegenmaßnahmen verantwortlich ist.

Warning

Avertissement

Achtung

Declaration of Conformity

Manufacturer's Name: RAD Data Communications Ltd.

Manufacturer's Address: 24 Raoul Wallenberg St., Tel Aviv 69719, Israel

declares that the product:

Product Name: FOMi-40

conforms to the following standard(s) or other normative document(s):

EMC: EN 55022:1998 + Information technology equipment – Radio disturbance

A1:2000, A2:2003 characteristics – Limits and methods of measurement.

EN 55024:1998 + Information technology equipment – Immunity characteristics –

A1:2001, A2:2003 Limits and methods of measurement.

Safety: EN 60950-1:2001 Information technology equipment – Safety – Part 1: General requirements.

Supplementary Information:

The product herewith complies with the requirements of the EMC Directive 89/336/EEC, the Low Voltage Directive 73/23/EEC and the R&TTE Directive 99/5/EC for wired equipment. The product was tested in a typical configuration.

Tel Aviv, 28 July 2005

Haim Karshen

VP Quality

European Contact: RAD Data Communications GmbH, Otto-Hahn-Str. 28-30, 85521 Ottobrunn-Riemerling, Germany

FOMi-40 Ver. 1.0 Installing FOMi-40 1

Quick Start Guide

If you are familiar with fiber optic modems, use this guide to prepare FOMi-40 for operation.

1. Installing FOMi-40

Setting the Internal Jumper and Switch

Make sure that the power cord is disconnected before opening the unit case.

To make the internal settings:

1. Open the FOMi-40 case.

2. Set the CHASS GND jumper to CON.

3. Set the SW1 switch, as follows:

OLD: FOMi-40 is compatible with the older FOMi-40s (featuring software revision 1.01 or lower).

NEW: FOMi-40 is compatible with the newer FOMi-40s (featuring software revision higher than 1.01).

4. Close the FOMi-40 case.

Connecting the Interfaces

To connect the line:

Connect the fiber optic cables to the respective RX and TX connectors on the rear panel of FOMi-40.

To connect the DTE:

Connect the DTE to the appropriate DTE connector on the rear panel of FOMi-40.

Connecting the Power

To connect the AC power:

Connect the power cable to the connector on the FOMi-40 rear panel and then to the mains outlet.

Warning

Quick Start Guide Installation and Operation Manual

2 Configuring FOMi-40 FOMi-40 Ver. 1.0

To connect DC power:

Refer to the DC power supply connection supplement for instructions how to wire the DC cables. The DC supplement is provided on the technical documentation CD supplied with the unit.

2. Configuring FOMi-40

Configure FOMi-40 to the desired operation mode via the front panel LCD and buttons. The initial configuration of the FOMi-40 modem includes selection of the clock reference and operating data rate. Configuration must be performed for the local and remote modems.

Selecting the Clock Mode

Select the clock mode for both local and remote modem.

To select clock mode:

Scroll to CLKTYPE under LINE CONFIG and select the desired clock type of the modems (INT RCV, EXT RCV, RCV INT, or RCV EXT).

Selecting the Data Rate

Select the operation data rate.

To select data rate:

Scroll to BITRATE under LINE CONFIG and select the desired bit rate.

Selecting Remote Unit Type

Specify the type of the remote modem: FOM-40 or NEW (FOMi-40).

To select data rate:

Scroll to REM.M under LINE CONFIG and select the remote modem type.

FOMi-40 Ver. 1.0 i

Contents

Chapter 1. Introduction 1.1 Overview....................................................................................................................1-1

Versions .................................................................................................................1-1 Applications............................................................................................................1-2 Features .................................................................................................................1-3

Fiber Optic Interface ..........................................................................................1-3 DTE Interface .....................................................................................................1-3 Timing................................................................................................................1-3 Remote Management .........................................................................................1-3 Diagnostics ........................................................................................................1-3

1.2 Physical Description ...................................................................................................1-4 1.3 Functional Description................................................................................................1-5

Management ..........................................................................................................1-5 Timing ....................................................................................................................1-6 Backward Compatibility ...........................................................................................1-6

1.4 Technical Specification ...............................................................................................1-6

Chapter 2. Installation and Setup 2.1 Introduction...............................................................................................................2-1 2.2 Site Requirements and Prerequisites ..........................................................................2-2 2.3 Package Contents ......................................................................................................2-2 2.4 Installation Overview..................................................................................................2-2 2.5 Setting the Internal Jumper and Switch.......................................................................2-3

Opening the Case ...................................................................................................2-3 Setting the Jumper and Switch ................................................................................2-3 Closing the FOMi-40 Case .......................................................................................2-5

2.6 Connecting the Cables................................................................................................2-5 Connecting the Line................................................................................................2-5 Connecting the DTE ................................................................................................2-5 Connecting G.703 Codirectional Interface with TB Connector...................................2-6 Connecting the Power.............................................................................................2-6

AC Power Connection .........................................................................................2-6 DC Power Connection.........................................................................................2-6

Chapter 3. Operation 3.1 Turning FOMi-40 On...................................................................................................3-1 3.2 Front Panel Controls and Indicators ............................................................................3-1 3.3 Normal Indications .....................................................................................................3-4 3.4 FOMi-40 Configuration ...............................................................................................3-4 3.5 Turning FOMi-40 Off ..................................................................................................3-4

Chapter 4. Configuration 4.1 Menu Tree .................................................................................................................4-1 4.2 Main Screen ...............................................................................................................4-2

LCD Data Fields.......................................................................................................4-2 Front-Panel Buttons................................................................................................4-2

4.3 FOMi-40 Submenus....................................................................................................4-2

Table of Contents Installation and Operation Manual

ii FOMi-40 Ver. 1.0

STATUS Menu .........................................................................................................4-3 ALARM BUFFER Menu ..............................................................................................4-5 CONFIG MATCHING Menu.........................................................................................4-7 LINE CONFIG Menu ..................................................................................................4-9 Selecting the Clock Type .......................................................................................4-10

Setting the Bit Rate..........................................................................................4-12 Setting the REM MODEM (REM.M).....................................................................4-13

DTE CONFIG Menu.................................................................................................4-14 Configuring the LLB Command..........................................................................4-14 Configuring the RLB Command .........................................................................4-16

Test Menu ............................................................................................................4-17

Chapter 5. Configuring Typical Applications 5.1 Point-to-Point Application ..........................................................................................5-1 5.2 Central Site Application ..............................................................................................5-2 5.3 Interface Conversion Application ................................................................................5-3

Chapter 6. Troubleshooting and Diagnostics 6.1 TESTS Menu ...............................................................................................................6-1

Running the LLB Test ..............................................................................................6-2 Running the RLB Test..............................................................................................6-4 Running the LLB +BERT Test....................................................................................6-5 Running the RLB +BERT Test ...................................................................................6-7 Running the BER Test..............................................................................................6-9 Checking the LEDs ................................................................................................6-11

6.2 System Messages and Alarms...................................................................................6-12 System Messages .................................................................................................6-12 Alarms..................................................................................................................6-13

6.3 Loopback Tests ........................................................................................................6-14 Local Analog Loopback (LLB).................................................................................6-14 Remote Digital Loopback (RLB) .............................................................................6-15 Activating Loopbacks from Remote Location .........................................................6-16

6.4 Running an Internal BER Test....................................................................................6-17 6.5 Troubleshooting.......................................................................................................6-18 6.6 Frequently Asked Questions.....................................................................................6-19 6.7 Technical Support ....................................................................................................6-20

Appendix A. Pinouts Appendix B. IR-ETH/QN Interface Module Appendix C. IR-E1/G703 Interface Module Appendix D. IR-G.703/CO Interface Module Appendix E. IR-X.21B Interface Module

FOMi-40 Ver. 1.0 Overview 1-1

Chapter 1

Introduction

1.1 Overview

FOMi-40 is a synchronous high speed fiber optic modem, which enables secure communication between two data devices over a fiber optic link.

It provides high speed data link between computers, routers, multiplexers and other DTE devices.

Its’ functions include:

• Multimode or single mode operation

• Secure data transfer

• Immunity against electrical interference

• Protection from sparking and lightning.

In its simplest configuration, it can be used to transfer data between two stations connected point-to-point. In its advanced configuration, it can connect a remote site to a network hub.

Versions

FOMi-40 is available in several versions:

• FOMi-40/M – A master standalone version, which features a front panel LCD and buttons for controlling all management functions.

• FOMi-40/S – A slave unit with a blank panel and 20-pin connector. A portable control unit (PCU) connects to the front panel via this connector to enable all management functions supported in the master version. By disconnecting the PCU, unauthorized operation is prevented.

• Single modem and dual modem cards (FOMi-40C and FOMi-40CD) are available for the LRS-24, 19-inch modem rack with central SNMP management. Refer to FOMi-40C and FOMi-40CD installation and operation manuals for the detailed descriptions of these modem versions.

Chapter 1 Introduction Installation and Operation Manual

1-2 Overview FOMi-40 Ver. 1.0

Applications

Figure 1-1 illustrates point-to-point application using FOMi-40. This configuration is typically used to create a point-to-point interface between a server and a remote station. FOMi-40 master and slave units are connected over a dedicated fiber optic trunk. The FOMi-40 slave unit is connected to a PCU remote control unit. In this application, you can configure the link from either the local or remote side of the connection.

Figure 1-1. Point-to-Point Application

Figure 1-2 shows a network comprised of multiple point-to-point connections. In this application, each slave unit is connected to a FOMi-40C single modem card. All cards are mounted in the LRS-24 modem rack. The network described accommodates 12 links managed from a central SNMP management station.

Figure 1-2. Central Site Application with SNMP Management

Installation and Operation Manual Chapter 1 Introduction

FOMi-40 Ver. 1.0 Overview 1-3

Features

Fiber Optic Interface

Table 1-1 details fiber optic interface types supported by FOMi-40.

Table 1-1. Fiber Optic Interface Types

Wavelength

[nm]

Fiber Type

[μm]

Transmitter

Type

Power

[dBm]

Receiver

Sensitivity

[dBm]

Typical Max.

Range

[km] [mi]

850 62.5/125 multimode VCSEL -18 -38 5 3

1310 9/125 single mode Laser -13 -40 50 31

1550 9/125 single mode Laser -13 -40 100 62

DTE Interface

FOMi-40 operates at the twelve selectable data rates are: 56, 64, 112, 128, 256, 384, 512, 768, 1024, 1536, 1544, and 2048 kbps. This includes the 1544 kbps rate for T1 and 2048 kbps rate for E1 transmission.

FOMi-40 supports the following DTE interfaces:

• V.24/RS-232 (up to 64 kbps)

• RS-530

• V.35

• X.21

• V.36

• IR-G.703/CO (G.703 Codirectional, 64 kbps)

• IR-E1 (G.703 E1)

• T1 (1544 kbps only)

• IR-ETH/QN (Ethernet/Fast Ethernet bridge with VLAN support).

Timing

FOMi-40 transmit timing can be derived either internally, or externally. Possible external sources for the transmit timing are the data terminal or the receive signal. The receive timing is always regenerated from the receive signal.

Remote Management

FOMi-40 provides full management of both local and remote modems, real-time alerts on failures, diagnostic testing, and statistical information on system performance.

The operator manages both local and remote modems by accessing the front panel LCD and buttons.

The configuration parameters are stored in non-volatile memory.

Diagnostics

FOMi-40 features V.54 diagnostic capabilities for performing local analog and digital loopbacks and remote digital loopback. The local analog and remote digital loopbacks are controlled by front-panel pushbuttons or by a DTE interface for V.24, V.35 and RS-530 protocols.


1-4 Physical Description FOMi-40 Ver. 1.0

A front panel pushbutton generates an internal 511-bit pseudo-random test pattern (PATT), according to ITU V.52, for direct end-to-end integrity testing. When the test is running, the ERR indicator blinks for each bit error detected.

1.2 Physical Description

FOMi-40 is compact unit, intended for tabletop or 19-inch rack installation. Figure 1-3 illustrates the 3D view of FOMi-40 master and slave units.

Figure 1-3. FOMi-40 3-D View

The front panel includes seven LEDs, which display the status of power, data flow, control signals and diagnostics.

FOMi-40/M also includes LCD together with three buttons is used to display status (alarm) messages, and diagnostics of. You can also use the LCD and buttons to configure the unit. For details, refer to Chapter 4.

The back panel includes a power connector (AC or DC), a DTE interface connector, and a line connector. The FOMi-40 rear panel is described in greater detail, in Chapter 2.


FOMi-40 Ver. 1.0 Functional Description 1-5

1.3 Functional Description

This section contains functional descriptions of the FOMi-40 circuit blocks shown in Figure 1-4.

PowerSupply

DTEInterface

BERT

PLL

CDP

FiberOptic

TXTX

TXSFM

RXSFM

RXRX

LCD/PCUand

LEDs

CPU80C32

Xilinx

CDPScrambler

Descrambler

Figure 1-4. FOMi-40 Block Diagram

FOMi-40 converts electrical signals from the DTE into an optical signal. At the receive end of the fiber, the optical signal is converted back into an electrical signal in compliance with the appropriate interface.

FOMi-40 utilizes a Phase Locked Loop (PLL) circuit to recover jitter-free data and a clock reference from the optical signal.

Management

The modem uses an inband management channel for controlling and monitoring the remote unit. Both data and management are transmitted simultaneously over the same fiber link without interference.

Menu-driven software, available on the front panel, allows the user to soft select the monitoring and adjustment of local and remote units.

The front panel software menus allow the user to monitor and control the following parameters:

• Data rate (when set to internal or receive clock)

• Clock source

• Loopback activation

• Internal BER tester activation

• LED status of local and remote units

• Setting both local and remote units to factory default settings

• Real time alert of fault conditions.


1-6 Technical Specification FOMi-40 Ver. 1.0

Timing

The modulation timing circuit supplies the transmit clock timing signal to the encoder. Three timing sources are available:

• Internal – clock recovered from the modem's internal crystal oscillator

• External – clock recovered from the DTE

• Receive Loopback – clock recovered from the receive signal, looped back as a transmit clock.

Backward Compatibility

FOMi-40 is compatible with its older versions that feature previous software revisions. Refer to Setting the Internal Jumper and Switch in Chapter 2 for details.

1.4 Technical Specification

Optical Interface

Transmission Line Dual fiber optical cable

Specifications and Ranges

Refer to Table 1-1

Dynamic Range 28 dB

Modulation CDP

DTE Interface Transmission Rate 56, 64, 96, 112, 128, 192, 256, 384, 512, 768, 1024, 1536, 1544 and 2048 kbps

Interfaces and Connectors

• V.24 (RS-232), 25-pin D-type, female

• RS-530 (V.11/RS-422), 25-pin D-type, female

• V.35, 34-pin, female

• X.21, 15-pin D-type, female

• V.36, 37-pin D-type, female (via adapter cable)

• IR-G.703/CO (64 kbps), 5-clip terminal block or RJ-45

• T1 (1544 kbps only), RJ-45

• IR-ETH/QN, RJ-45

Diagnostics V.54 Loopbacks Local analog loopback (LLB): activated by management software or by the DTE interface signal (V.24, V.35 and RS-530 only)

Remote digital loopback (REM): activated by management software or by the DTE interface connector signal (V.24, V.35 and RS-530 only)


FOMi-40 Ver. 1.0 Technical Specification 1-7

Internal BERT Built-in pattern generator and tester, complies with ITU V.52

LEDs Check Activates the local LEDs for a 3-second period, from the front panel

Timing Receive Clock Derived from the receive signal

Transmit Clock Derived from three alternative sources:

• Internal

• External: from the attached DTE

• Receive: from the receive signal

Indicators PWR (green) Power

RTS (yellow) Request to Send

TD (yellow) Transmit Data

RD (yellow) Receive Data

DCD (yellow) Data Carrier Detected

TEST (red) Loopback Mode or BERT

ERR(red) BERT Error

Power AC Source 115 VAC or 230 VAC (±10%), 50 Hz to 60 Hz

DC Source 24 VDC (18 to 36 VDC) or-48 VDC (-36 to -72 VDC)

Power Consumption

5.5W max

Physical FOMi-40 Height: 4.4 cm (1.7 in) Width: 24.0 cm (9.6 in) Depth: 19.3 cm (7.6 in) Weight 1.4 kg (3.1 lb)

PCU (Portable Control Unit)

Height: 2.5 cm (0.98 in) Width: 13.0 cm (5.12 in) Depth: 6.5 cm (2.56 in) Weight: 220g (0.49 lb)

Environment Temperature 0°–50°C (32°–122°F)

Humidity 0 to 90%, non-condensing


1-8 Technical Specification FOMi-40 Ver. 1.0

FOMi-40 Ver. 1.0 Introduction 2-1

Chapter 2

Installation and Setup

2.1 Introduction

FOMi-40 is delivered completely assembled. It is designed for installation as a desktop unit or for mounting in a 19-inch rack.

FOMi-40 is delivered completely assembled. It is designed for tabletop or 19-inch rack installation. For rack installation instructions, refer to the rack mounting kit for 19-inch racks guide that comes with the RM kit.

After installing the unit, refer to Chapter 4 for detailed system configuration information and procedures for using the front panel controls.

Refer to Chapter 6 for troubleshooting and diagnostics information.

Internal settings, adjustment, maintenance, and repairs may be performed only by a skilled technician who is aware of the hazards involved.

Always observe standard safety precautions during installation, operation and maintenance of this product.

This module includes Class 1 lasers. For your safety:

• Do not look directly into the optical connectors while the unit is operating. The laser beam is invisible.

• Do not attempt to adjust the laser drive current.

The use of optical instruments with this product will increase eye hazard. Laser power up to 1 mW at 1300 nm and 1550 nm could be collected by an optical instrument.

Use of controls or adjustment or performing procedures other than those specified herein may result in hazardous radiation exposure.

Before installing the product, review Handling Energized Products at the beginning of the manual.

Warning

Note

Warning

Chapter 2 Installation and Setup Installation and Operation Manual

2-2 Installation Overview FOMi-40 Ver. 1.0

2.2 Site Requirements and Prerequisites

AC-powered FOMi-40 units should be installed within 1.5m (5 ft) of an easily-accessible grounded AC outlet capable of furnishing the required supply voltage, 115 VAC or 230 VAC, depending on the rated voltage of the unit.

DC-powered units require 24 VDC or -48 VDC power source, which must be adequately isolated from the mains supply.

Allow at least 90 cm (36 in) of frontal clearance for operating and maintenance access. Allow at least 10 cm (4 in) clearance at the rear of the unit for signal lines and interface cables.

The ambient operating temperature of FOMi-40 is 0°–50°C (32°–122°F) at relative humidity of up to 90%, non-condensing.

2.3 Package Contents

The package of the standalone FOMi-40 modem includes:

• One FOMi-40 standalone unit

• AC power cord or DC power supply connector kit

• CBL-530/449 adapter cable for the FOMi-40 units with V.36 interface

• Documentation CD

• RM-9 rack adapter kit (if ordered).

2.4 Installation Overview

FOMi-40 is designed for tabletop or bench installation, and is delivered completely assembled. No provisions are made for bolting the FOMi-40 to the tabletop

To install FOMi-40:

1. Determine the required configuration of FOMi-40, according to your application, and set the internal jumper and switch accordingly (see Setting the Jumper and Switch below).

2. Connect the DTE and fiber optic cables (see Connecting the Cables below).

3. Connect power to the unit (see Connecting the Power below).

Installation and Operation Manual Chapter 2 Installation and Setup

FOMi-40 Ver. 1.0 Setting the Internal Jumper and Switch 2-3

2.5 Setting the Internal Jumper and Switch

Opening the Case

To reach the internal jumper and switch of FOMi-40, it is necessary to open its case with a flat screwdriver.

Access to the inside of the FOMi-40 equipment is permitted only to authorized and qualified service personnel.

To avoid accidental electric shock, always disconnect the interface cables and the power cord before removing the unit from its casing.

Line voltages are present inside FOMi-40 when it is connected to power and/or to the lines. Moreover, under external fault conditions dangerous voltages may appear on the lines connected to the unit.

Any adjustment, maintenance, and repair of the opened equipment under voltage should be avoided as much as possible and, when absolutely necessary, should be carried out only by a skilled technician who is aware of the hazard involved. Capacitors inside the instrument may still be charged even after the instrument has been disconnected from its source of supply.

FOMi-40 contains components sensitive to electrostatic discharge (ESD). To prevent ESD damage, avoid touching the internal components. Before moving jumpers, touch the FOMi-40 frame.

To open the FOMi-40 case:

1. Disconnect all cables connected to FOMi-40.

2. Release the two rear panel screws and use them as levers to slide out the PCB interior of the unit.

Setting the Jumper and Switch

Figure 2-1 shows the FOMi-40 PCB layout.

Warning

Caution


2-4 Setting the Internal Jumper and Switch FOMi-40 Ver. 1.0

Optical InterfaceBoard

DTE InterfaceBoard

NEW

OLDSW

1

CHASS GND

JP1

CON

DIS

Figure 2-1. FOMi-40 PCB Layout

The JP1 located on the FOMi-40 PCB is the CHASSIS GND jumper designed for configuring the chassis ground. There are two possible settings of JP1:

• CON: the signal ground is connected to the chassis ground

• DIS: the signal ground is isolated from the chassis ground.

The default setting is CON.

The SW1 switch enables FOMi-40 to work opposite the FOMi-40 units that feature previous software revisions. There are two possible settings of SW1:

• OLD: FOMi-40 is compatible with the older FOMi-40s (featuring software revision 1.01 or lower).

• NEW: FOMi-40 is compatible with the newer FOMi-40s (featuring software revision higher than 1.01).

The default setting is NEW.

Installation and Operation Manual Chapter 2 Installation and Setup

FOMi-40 Ver. 1.0 Connecting the Cables 2-5

The FOMi-40 software revision is displayed in the upper right-hand corner of the LCD during the initialization of the unit.

Closing the FOMi-40 Case

After completing the internal settings, close the FOMi-40 case.

1. Slide the PCB interior back into case.

2. Tighten the two rear panel screws to fasten the PCB in the case.

2.6 Connecting the Cables

Figure 2-2 illustrates the rear panel of the standalone FOMi-40. The rear panel of FOMi-40 unit contains an AC, or DC, input power connector; a DTE interface connector; and TX and RX fiber optic connectors.

TX RXDTE

Figure 2-2. FOMi-40 Rear Panel(AC Version)

Connecting the Line

Two fiber optic SC, ST or FC/PC connectors are located on the rear panel and marked TX and RX.

To connect the fiber optic cables:

1. Remove the protective caps from the connectors and store them in a safe place for later use.

2. Connect the transmit fiber to the connector marked Tx and the receive fiber to the connector marked Rx.

3. At the remote unit connect the transmit fiber to Rx and the receive fiber to Tx.

Connecting the DTE

To connect the DTE interface, except G.703/CO/TB:

Press the end of the connector into the DTE interface connection on FOMi-40.

For more information on a particular DTE interface, see the appropriate appendix in this manual. If problems arise when connecting to the DTE interface, first check that the DTE interface is properly terminated.

Note


2-6 Connecting the Cables FOMi-40 Ver. 1.0

RAD recommends using a shielded twisted pair cable between FOMi-40 and the DTE (mainly for higher frequencies). The line receivers in FOMi-40 are 100Ω terminated (for X.21B and RS-530).

Connecting G.703 Codirectional Interface with TB Connector

1. Strip off about 1 cm of insulation from the wire and twist the loose wire ends together.

2. Insert a screwdriver into the square upper hole on the terminal block.

3. Raise the handle of the screwdriver to open the round lower hole.

4. Insert the stripped end of the wire into the round lower hole and then remove the screwdriver.

For safety reasons, it is advisable to set the CHASSIS GND jumper to the CON position when using the G.703 interface.

Connecting the Power

To connect the power to FOMi-40, refer to the appropriate section below, depending on your version of the unit (AC or DC).

The unit has no power switch. Operation starts when the power is applied to the rear panel POWER connector.

AC Power Connection

AC power should be supplied to FOMi-40 through the 1.5m (5 ft) standard power cable terminated by a standard 3-prong plug (see Figure 2-2). The cable is provided with the unit.

To connect AC power:

Connect the power cable to the connector on the FOMi-40 rear panel and then to the mains outlet.

The unit will be turned on automatically upon connection to the mains.

DC Power Connection

To connect DC power:

Refer to DC power supply connection supplement.

Note

Warning

Warning

FOMi-40 Ver. 1.0 Front Panel Controls and Indicators 3-1

Chapter 3

Operation

This chapter describes the FOMi-40 operational controls, indicators and their functions.

Make sure you have completed the installation procedures detailed in Chapter 2 before attempting to operate FOMi-40.

3.1 Turning FOMi-40 On

FOMi-40 is turned on as soon as power is connected. When power is connected, the PWR indicator lights up and remains lit as long as FOMi-40 receives power.

3.2 Front Panel Controls and Indicators

All controls and LED indicators are located on the FOMi-40 front panel. On the master unit of FOMi-40 and on the PCU, there are three buttons on the front panel – CURSOR, SCROLL and ENTER. These buttons allow you to perform any operation contained in the menu currently displayed on the front panel LCD, switch menus, change the system configuration, or monitor the system status.

An LCD appears on the front panel of the FOMi-40 master version and on the PCU. Each row contains 16 characters to display the current user menu. The slave version features a proprietary 20-pin connector for attaching the PCU to the unit.

Figure 3-1 and Figure 3-2 show the front panels of the FOMi-40 master version and PCU control unit, respectively. Control functions are common for both units.

Chapter 3 Operation Installation and Operation Manual

3-2 Front Panel Controls and Indicators FOMi-40 Ver. 1.0

ERRTESTDCDRD

CURSOR SCROLL ENTER

TDRTSPWRFOMi-40 FOMi-40 REV X.XX

INITIALIZATION

7

8 9 10 11

654321

Figure 3-1. FOMi-40 Master Front Panel

FOMi-40 REV X.XX

INITIALIZATION

PCUCONTROL UNIT

CURSOR SCROLL ENTER

8 9 10 11

Figure 3-2. PCU Front Panel

Figure 3-3 shows the front panel of the FOMi-40 slave version. Indicator functions are identical to those featured on the master version and are indicated by the same numbers used in Figure 3-1.

ERR

CONTROL

TESTDCDRDTDRTSPWRFOMi-40

7

12

654321

Figure 3-3. FOMi-40 Slave Front Panel

Installation and Operation Manual Chapter 3 Operation

FOMi-40 Ver. 1.0 Front Panel Controls and Indicators 3-3

Table 3-1 explains each of the FOMi-40 LEDs and buttons. Explanations given here apply to all units pictured. Their numbers under the heading "Item" correspond to the identification numbers shown in Figure 3-1, Figure 3-2 and Figure 3-3.

Table 3-1. FOMi-40 Front Panel Controls and Indicators

Item Type Function

1 PWR Green LED On – Power is ON

2 RTS Yellow LED On – DTE activates Request To Send

3 TD Yellow LED On – Steady SPACE is being transmitted

Blinks – Data is being transmitted

4 RD Yellow LED On – Steady SPACE is being received

Blinks – Data is being received

Not active when the RLB is active

5 DCD Yellow LED On – A valid received line signal is present.

6 TEST Red LED On – The unit is in any of the two loopback modes and/or when

BERT is activated.

7 ERR Red LED On when an alarm is initiated.

Blinks whenever an error is detected in BER tests.

Blinks at a rate of 20 times per second if a frequency hopping

occurs (see System Messages and Alarms in Chapter 4).

8 CURSOR Button Enables the user to move the cursor position through the menu

screens and fields.

9 SCROLL Button Enables the user to scroll between the current menu field options.

10 ENTER Button Selects the current field option and updates both local and

remote modem databases.

11 LCD display Displays the current menu screen and cursor position.

12 CONTROL 20-pin male

connector

Attaches PCU to slave unit.

Chapter 3 Operation Installation and Operation Manual

3-4 Turning FOMi-40 Off FOMi-40 Ver. 1.0

3.3 Normal Indications

Table 3-2 describes front panel indicator activity during the FOMi-40 operation.

Table 3-2. FOMi-40 Indicator Activity

Indicator Status

PWR On

LCD Display Displays opening screen: "FOMi-40 Rev X.XX INITIALIZING"

ERR OFF when connected to remote modem;

Blinks when the line is disconnected.

TEST OFF

TD Depends on the DTE data transmission

RD Depends on the remote DTE data transmission

RTS Depends on the DTE RTS signal status

DCD Depends on the synchronization between the local and the remote

modems. ON when the modems are synchronized.

3.4 FOMi-40 Configuration

All configuration activities are performed from the front panel of FOMi-40. For more information on configuration, see Chapter 4.

3.5 Turning FOMi-40 Off

To turn off the modem, remove the power cord from the power source.

FOMi-40 Ver. 1.0 Menu Tree 4-1

Chapter 4

Configuration

This chapter describes how to configure FOMi-40.

The FOMi-40 front panel LCD and buttons enable the user to control and monitor both local and remote modems using menu-driven software.

4.1 Menu Tree

The main operational menu is comprised of six submenus. Submenus are displayed on the LCD one after the other in a cyclic order. The menu tree is illustrated in the following figures.

Figure 4-1. Main Menu Tree

Chapter 4 Configuration Installation and Operation Manual

4-2 FOMi-40 Submenus FOMi-40 Ver. 1.0

4.2 Main Screen

Following initialization, the main operational screen appears on the front panel LCD. Figure 4-2 shows the FOMi-40 main LCD display screen during normal operation. As shown, the LCD consists of four data fields.

Menu Type LOC/REM

Menu Options Parameters

Figure 4-2. LCD Fields

LCD Data Fields

The function of the data fields is as follows:

MENU Type Scrolls through the available control menus

LOC/REM Toggles between controlling and monitoring the local modem or the remote modem

Menu Options Indicates the control and monitoring options of each control menu

Parameters Sets the parameter for the controllable menu options.

Front-Panel Buttons

Menus are accessed and operations are activated via the three control buttons on the FOMi-40 front panel. The three basic control functions are:

CURSOR Selects the field

SCROLL Scrolls through the field options, and allows you to make changes at the current field

ENTER Confirms and accepts a selected option.

4.3 FOMi-40 Submenus

Six submenus are available for configuring and operating FOMi-40.

STATUS Enables the user to monitor the current status of the modem, i.e. local or remote.

ALARM BUFFER Informs the user of modem alarms.

CONFIG MATCHING Enables the user to fast match the line configuration according to the parameters of the local unit or according to the parameters of the remote unit. This menu appears only if there is a mismatch between the line settings of the local and remote modems (see CONFIG MATCHING Menu below).

Installation and Operation Manual Chapter 4 Configuration

FOMi-40 Ver. 1.0 FOMi-40 Submenus 4-3

LINE CONFIG Is used to configure the line parameters.

DTE CONFIG Is used to configure both local and remote DTE.

TESTS Enables the user to perform several diagnostic tests on the local modem and on the remote modem.

The following sections detail procedures to perform the main operations of each submenu. The menus are listed in the order in which they appear on the LCD.

An asterisk (*) in any of the menus indicates the presently set value.

STATUS Menu

Figure 4-3. Status Menu

The STATUS menu enables user to monitor the current status of the local or remote modem.

To access any of the functions of the STATUS menu:

1. Press the CURSOR button to move to the Menu Type field.

2. Press the SCROLL button until STATUS is displayed.

Menu Type

TESTS REMDTE CONFIGLINE CONFIGALARM BUFFERSTATUS

LOC

LOC/REM

Menu Options Parameters

Figure 4-4. STATUS Menu

Note



3. Press the CURSOR button to move to the LOC/REM field.

4. Press the SCROLL button to toggle between local modem and remote modem (if management is not active, the remote modem will not be displayed).

5. Press the CURSOR button to move to the Menu Options field.

6. Press the SCROLL button to scroll through the menu options, to reach the desired option:

Select BITRATE to display the line bit rate in the Parameters field (see Figure 4-5).

Select CLKTYPE to display the currently used clock type in the Parameters field.

Select INTERFACE to display the type of the connected interface (between the modem and the DTE) in the Parameters field.

Select FO-INTRF (Fiber Optic Interface) to display the type of the fiber optic interface in the Parameters field.

Select REM to display the remote modem type in the Parameters field.

Select TEST to display the test which is currently being performed. For an explanation on how to view and run tests, see Error! Bookmark not defined. on page Error!. The displayed tests are:

Table 4-1. Test Displays

Display Test Performed Performed By

NONE No test being performed

LLB LLB test Local unit

RLB RLB test Local unit

LLB + BERT LLB + BERT test Local unit

RLB + BERT RLB + BERT test Local unit

BERT BERT test Local unit

DTE -> LLB LLB test Local DTE

DTE -> RLB RLB test Local DTE

REMOTE TEST To find out which specific test is run,

scroll to: STATUS → REM → TEST

Remote unit

LEDS CHECK LEDS CHECK test Local unit



STATUS

REM.MTEST

FO-INTRFINTERFACECLKTYPEBITRATE

LOC

BITRATE

Figure 4-5. STATUS → BITRATE Menu

ALARM BUFFER Menu

Figure 4-6. Alarm Buffer Menu

The modem's alarms are stored in the alarm buffer. If the ERR indicator lights up and you wish to identify the problem, you can view the alarm buffer.



To view the alarm buffer:

1. Press the CURSOR button to move to the Menu field.

2. Press the SCROLL button until ALARM BUFFER is displayed.

ALARM BUFFER

DTE CONFIGTESTS

LINE CONFIGINTERFACEALARM BUFFERSTATUS

REM

MENU OPTIONS

Figure 4-7. ALARM BUFFER Menu


4. Press the SCROLL button to toggle between the local and the remote modem. (If management is not active, the remote modem will not be displayed).

5. If there is a problem, its cause will be displayed in the Menu Options field. If the failure has more than one cause, scroll through the field, using the SCROLL button to monitor all the causes.

The possible causes of failure (which will be displayed in the Menu Options field) are:

Config Mismatch

Line Disconnect

DCD Loss

No Management

NVRAM failed

No Interface

No Fiber Interface

Illegal Ext CLK

XILINX failed

FREQ. Hopping

Def. Rate 64K/1544K/2048K

IR Rate Mismatch.

Figure 4-8 shows an example of the FOMi-40 alarm (DCD Loss), stored in the alarm buffer. Refer to Chapter 4 for detailed description of failure types and how to handle them.



ALARM BUFFER

NVRAM FAILEDNO INTERFACENO FIBER INTERFACEILLEGAL EXT CLKXILINX FAILEDFREQ. HOPPINGDEF. RATE 64K/1544K/2048KIR RATE MISMATCH

NO MANAGEMENTDCD LOSSLINE DISCONNECTCONFIG MISMATCH

REM

DCD LOSS

Figure 4-8. DCD LOSS Alarm Display

CONFIG MATCHING Menu

The Config Matching menu is available only if there is a mismatch between the line settings of the local and remote modems. From this menu, you can configure both modems to the same parameters.

In case of a configuration mismatch, the following screen appears:

ALARM BUFFER LOC

CONFIG MISMATCH

Figure 4-9. CONFIG MISMATCH Display

To match the configuration of the two modems:

1. Press the SCROLL button to display the following screen:



ALARM BUFFER

LOCCONFIG MISMATCH

LOCREM

Figure 4-10. CONFIG MATCHING Menu

2. Press the CURSOR button to reach the Parameters field. Using the SCROLL button, select the unit with the desired configuration settings.

3. Press the ENTER button to configure the units (a WAIT ... message will be displayed on the LCD, for a short while, while the units are configured). The unit returns to the ALARM BUFFER menu and the CONFIG MISMATCH failure alarm is erased.

Both the local and the remote modems store configuration settings. Some of the parameters stored in a unit's configuration memory are the parameters of the DTE interface of the local modem and the remote modem. When the CONFIG MATCHING function is selected, identical parameters are set for both modems.



LINE CONFIG Menu

Figure 4-11. Line Config Menu

The LINE CONFIG menu enables you to configure the line parameters. You can configure both the local modem and the remote modem, provided that both modems are connected and management is active.

When the above conditions are met, the message "WAIT..." is displayed. At this time, the local modem sends new settings to the remote modem and receives acknowledgment. Once the acknowledgment is received, the "WAIT..." message disappears and the new setting is displayed with an asterisk next to it.

Alternatively, If only the local modem is connected, or if the management is not active, you can configure the local modem only. In such a case, the message LOC CONFIG ONLY will appear briefly on the LCD, for each parameter you set.

If while trying to configure your system, the party on the other side of the line is trying to modify the configuration, the message "U R BEING CONFIG" appears on the LCD. Under this condition, you will not be able to modify the system configuration. You will be able to modify the configuration only when the other party finishes configuration procedure, and either:



• One minute has passed since the other party finished and the system returns back to STATUS,

or

• The other party scrolled out of the LINE CONFIG menu.

Selecting the Clock Type

You must select the clock type for both the local and remote modem.

FOMi-40 uses the settings INT RCV, EXT RCV, RCV INT, and RCV EXT to designate the clock type as follows:

Table 4-2. FOMi-40 Clock Type Settings

Clock Type Setting Clock at This Modem A Clock at Opposite Modem B

INT RCV Sourced from modem A Taken from line

RCV INT Taken from line Sourced from modem B

EXT RCV Comes from DTE A interface Taken from line

RCV EXT Taken from line Comes from DTE B interface

The following applications illustrate FOMi-40 clock type settings:

Figure 4-12. FOMi-40 Clock Type Settings

FOMi-40 with the Ethernet interface module IR-ETH/QN does not support the external clock.

To set the clock type:


2. Press the SCROLL button until LINE CONFIG is displayed.

Note



LINE CONFIG

MENU OPTIONS

STATUSALARM BUFFERLINE CONFIGDTE CONFIGTESTS

Figure 4-13. LINE CONFIG Menu


4. Press the SCROLL button until CLKTYPE is displayed.

LINE CONFIG

CLKTYPE

CLKTYPEBITRATEREM. M

Figure 4-14. CLKTYPE Menu

5. Press the CURSOR button to move to the Parameters field.

6. Press the SCROLL button to display the desired clock type (INT RCV, EXT RCV, RCV INT, or RCV EXT).

7. Press the ENTER button to set your choice.

If you have selected the clock type to be EXT RCV or RCV EXT, the bit rate of both the local and remote modems will be set to AUTO. This state will then be displayed in the Parameters field of the LINE CONFIG, BITRATE menu.

At the same time, the device measures the frequency of the external clock. If the rate is one of those supported by the device, it will be displayed in the Parameters field of the STATUS, BITRATE menu. If the clock rate is not supported by the device, the Parameters field of the STATUS, BITRATE menu will display AUTO and the alarm ILLEGAL EXT CLK will be stored and displayed in the alarm buffer.

If the MANAGEMENT is active, the external clock report is sent to the remote unit, which also displays the same parameters as the local unit.



LINE CONFIG

CLKTYPE *INT RCV

INT RCVEXT RCVRCV INTRCV EXT

Figure 4-15. Selecting the Clock Type

Setting the Bit Rate

FOMi-40 enables you to select the bit rate between the local modem and the remote mode in INT RCV or RCV INT only. Fourteen bit rates are available: 56, 64, 96, 112, 128, 192, 256, 384, 512, 768, 1024, 1536, 1544 and 2048 kbps.

To set the bit rate:




4. Press the SCROLL button, until BITRATE is displayed.

LINE CONFIG LOC

BITRATE


Figure 4-16. BITRATE Menu



To select a bit rate from the BITRATE menu:


2. Using the SCROLL button select the required bit rate in the Parameters field.


LINE CONFIG

*56BITRATE

15442048

51276810241536

128192256384

566496112

Figure 4-17. Selecting the Bit Rate

Setting the REM MODEM (REM.M)

FOMi-40 allows you to select a remote modem type. The available choices are FOM-40 (old version) or NEW (FOMi-40).

To select a remote modem type:




4. Press the SCROLL button until REM.M is displayed.

LINE CONFIG

REM. M


Figure 4-18. REM. M Menu


6. Use the SCROLL button to select the desired modem.




LINE CONFIG

REM. M NEW

NEWFOM-40

Figure 4-19. Selecting the Remote Modem Type

DTE CONFIG Menu

Figure 4-20. DTE Config Menu

The DTE CONFIG menu enables you to configure the system control signals. From this menu you can enable or disable the Local Loopback (LLB) and Remote Loopback (RLB) to be initiated from the DTE.

Parameters are set using the same procedure used previously from the LINE CONFIG menu.

Configuring the LLB Command

Enabling the LLB command from the DTE CONFIG menu allows activation of the loopback test from the DTE. (See the TESTS menu below for a description of the LLB test.)

To enable the LLB test from the DTE:


2. Press the SCROLL button until DTE CONFIG is displayed.


4. Press the SCROLL button to select either the local modem or the remote modem.



DTE CONFIG

MENU OPTIONS

REM

LOCDTE CONFIGLINE CONFIGALARM BUFFERSTATUS

REMTESTS

Figure 4-21. DTE CONFIG Menu


6. Press the SCROLL until LLB is displayed.

DTE CONFIG

LLB

REM

RLBLLB

Figure 4-22. DTE CONFIG → LLB Menu


8. Use the SCROLL button to toggle between ENABLE and DISABLE.

9. Press the ENTER button to set your choice. When an LLB test is initiated by the DTE, the STATUS TEST menu displays DTE→LLB in the Parameters field.

While this test is running, the LINE CONFIG menu and the TEST menu are masked. Line parameters cannot be modified and no other tests can be initiated. The DTE→LLB test performance will terminate if the LLB option is disabled, or if the DTE completes the test request. When the test is stopped, you can once again modify line parameters and initiate other tests.



DTE CONFIG

LLB

REM

*ENABLE

DISABLEENABLE

Figure 4-23. Enabling or Disabling LLB from DTE

Configuring the RLB Command

The RLB command enables you to run a remote loopback test from the DTE, in order to test both the local modem and the line to the remote modem.

To enable the RLB test from the DTE:


2. Press the SCROLL button until DTE CONFIG is displayed.

3. Press the CURSOR button to move to the MENU OPTIONS field.

4. Press the SCROLL button until RLB is selected.

DTE CONFIG

RLB

REM

RLBLLB

Figure 4-24. DTE CONFIG → RLB Menu


6. Use the SCROLL button to toggle between ENABLE and DISABLE.

7. Press the ENTER button to set your choice. When an RLB test is initiated from the DTE, the STATUS, TEST menu will display DTE→RLB in the Parameters field. While this test is running, the LINE CONFIG menu, and the TEST menu are masked. Line parameters cannot be modified and no other test can be initiated. The DTE→RLB test performance will terminate when the RLB option is disabled, or when the DTE completes the test request. When the test is stopped, you can once again modify the line parameters and initiate other tests.



DTE CONFIG

RLB

REM

*ENABLE

DISABLEENABLE

Figure 4-25. Enabling or Disabling RLB from DTE

Test Menu

Figure 4-26. Tests Menu

The Test Menu, the description of how to use it, and the tests that can be run are described in Chapter 6.

FOMi-40 Ver. 1.0 Point-to-Point Application 5-1

Chapter 5

Configuring Typical Applications

FOMi-40 fiber optic modem provides a long range data link for connecting computers, routers, multiplexers and other data communication devices. This section contains procedures for configuring FOMi-40 in the following applications:

• Point-to-point application for connecting the communication ports of two computer hosts

• Central site application with SNMP management for connecting multiple computers in a network administered from a central management station

• Interface conversion application, using an interface conversion device to convert electrical levels to modem TTL levels (Ethernet, G.703 E1, and X.21).

5.1 Point-to-Point Application

FOMi-40 may be used in the point-to-point application to connect the communication ports of two computers (see Figure 5-1).

Figure 5-1. Point-to-Point Application

To connect the communication ports of two computers:

1. Set the internal jumper and switch of the local FOMi-40, as follows:

Set the J1 jumper to CON.

Set the S1 switch to OLD, if the remote FOMi-40 software revision is 1.01 or lower; or set the switch to NEW, if the software revision is higher than 1.01.

2. Repeat step 1 for the remote FOMi-40.

3. Install FOMi-40 at the local site by making all connections to the local computer communications port and to the site fiber optic infrastructure.

4. Install FOMi-40 at the remote site by making all connections to remote computer communications port and to the site fiber optic infrastructure.

5. Connect FOMi-40 to the power source; repeat for the remote unit.

Chapter 5 Configuring Typical Applications Installation and Operation Manual

5-2 Central Site Application FOMi-40 Ver. 1.0

Observe front panel indicator activity at power-up to verify that the units are operating properly.

6. Configure the master and slave units following the procedures detailed in Chapter 3.

5.2 Central Site Application

Figure 5-2 below shows a network comprised of multiple point-to-point connections. In this application, each remote unit connects to a FOMi-40C card. All cards are mounted in the LRS-24 modem rack. The network described here accommodates 12 links managed from a central SNMP management station.

Figure 5-2. Central Site Application with SNMP Management

To install FOMi-40 in the central site application with SNMP management:

1. Prepare the central site installation by providing an LRS-24 hub containing up to 12 FOMi-40C high speed fiber optic modems.

2. Install FOMi-40C at the local site by making all connections to the local computer communications port and to the site fiber optic infrastructure.

3. Install FOMi-40 at the remote site by making all connections to remote computer communications port and to the site fiber optic infrastructure.

4. Connect the LRS-24 modem rack to the power source.

5. Connect the remote FOMi-40 units to the power source.

6. Observe front panel indicator activity at power-up to verify that the units are operating properly.

7. Connect the SNMP management station to the LRS-24 modem rack.

8. Configure the lines connecting the central site and remote computers from the SNMP management station; follow the procedures detailed in the manual for the SNMP management software.

Installation and Operation Manual Chapter 5 Configuring Typical Applications

FOMi-40 Ver. 1.0 Interface Conversion Application 5-3

5.3 Interface Conversion Application

The FOMi-40 high speed fiber optic modem can be ordered with optional conversion modules that convert electrical signals to TTL modem levels, as shown in Figure 5-3. Conversion modules are available for the Ethernet, G.703 Codirectional, G.703 E1 or X.21 protocols (refer to Appendix B, Appendix C, Appendix D, Appendix E and Appendix F for additional information).

FOMi-40 FOMi-40

Fiber Optic Cable

Figure 5-3. Ethernet Interface Conversion Application

To install FOMi-40 in the interface conversion application:

1. Open the FOMi-40 case to gain access to the interface module board.

2. Set the module internal jumpers or DIP switches according to you application requirements; you can remove the interface module by releasing the screws fastening it to the FOMi-40 board.

3. Reinstall the interface module and close the FOMi-40 case.

4. Connect the DTE and line interfaces for both local and remote FOMi-40 units.

5. Power up the local and remote units.

6. Observe front panel LEDs activity at power-up to verify that the units are operating properly (the Ethernet interface module contains additional LEDs for the LAN activity indications).

Chapter 5 Configuring Typical Applications Installation and Operation Manual

5-4 Interface Conversion Application FOMi-40 Ver. 1.0

FOMi-40 Ver. 1.0 TESTS Menu 6-1

Chapter 6

Troubleshooting and Diagnostics

This chapter describes the Test Menu, how to check normal system operation, to isolate faulty equipment or cables and to identify other sources of system malfunction.

6.1 TESTS Menu

Figure 6-1. Tests Menu

The TESTS menu enables you to test the modems connected to your network equipment, including local and remote modems. You can activate the following tests from this menu:

• LLB Test to test the local modem by creating a local loopback

• RLB Test to test both modems and the line between them

• LLB + BERT to measure the Bit Error Rate (BER)

• RLB + BERT to measure the Bit Error Rate (BER)

• BERT to measure the Bit Error Rate (BER)

• LEDs CHECK to test the modem LEDs.

When a test is running from the TESTS menu, the LCD displays additional management information, including:

• Type of test

• BER is displayed on the LCD of the local modem (if the remote modem is set to the appropriate TEST menu, BER will also be displayed on its LCD).

When a test with BER measurement is performed, the LCD functions differently. The BER display erases part of the menu. Therefore, in order to restore the

Chapter 6 Troubleshooting and Diagnostics Installation and Operation Manual

6-2 TESTS Menu FOMi-40 Ver. 1.0

Parameters field you must press the CURSOR button and then to press the SCROLL button to switch to OFF.

When MANAGEMENT is inactive, only local tests can be performed (LEDs CHECK, LLB, LLB + BERT, BERT).

Running the LLB Test

The LLB test enables you to run a local loopback in order to test the local modem.

To run the LLB test:


2. Press the SCROLL button until TESTS is displayed.


4. Press the SCROLL button to select the local modem or the remote modem.

TESTS

MENU OPTIONS

REM

PARAMETERS

ALARM BUFFERLINE CONFIG

LOCREMDTE CONFIG

TESTS

STATUS

Figure 6-2. TESTS Menu (LLB)

5. Press the CURSOR button to move the Menu Options field.

6. Press the SCROLL button until LLB is displayed.

Installation and Operation Manual Chapter 6 Troubleshooting and Diagnostics


TESTS

LLB

LOC

PARAMETERS

RLBLLB+BERT

LOCREM

RLB+BERTBERTLEDS CHECK

LLB

Figure 6-3. LLB Test Menu


8. Use the SCROLL button to toggle between ON and OFF.

TESTS

LLB

LOC

ON

LOC

ON

REM

OFF

Figure 6-4. Activating LLB Test

9. To start the LLB test, press the ENTER button when ON is displayed. The message WAIT... will be displayed on the local modem screen, and then an asterisk will appear next to the ON indication.

10. To stop the test, press the SCROLL button until OFF is displayed and then press the ENTER button. The message WAIT... will be displayed on the local modem screen, and then an asterisk will appear next to the OFF indication and the test will be terminated.



Running the RLB Test

The RLB test enables you to run a remote loopback, in order to test both modems and the line between the modems.

TESTS

MENU OPTIONS

REM

PARAMETERS

ALARM BUFFERLINE CONFIG

LOCREMDTE CONFIG

TESTS

STATUS

Figure 6-5. TESTS Menu (RLB)

To run the RLB test:






6. Press the SCROLL button until RLB is displayed.

TESTS

RLB

LOC

PARAMETERS

RLBLLB+BERT

LOCREM


LLB

Figure 6-6. RLB Test Menu



7. Press the CURSOR button to move to Parameters field.

8. Press the SCROLL button to toggle between ON and OFF.

TESTS

RLB

LOC

ON

LOC

ON

REM

OFF

Figure 6-7. Activating RLB Test

9. To start the RLB test, press the ENTER button when ON is displayed. The message WAIT... will be displayed on the local modem screen, and then an asterisk will appear next to the ON indication.

10. To stop the test, press the SCROLL button until OFF is displayed and then press the ENTER button. The message WAIT... appears on the local modem screen, followed by an asterisk next to the OFF indication. The test then terminates.

Running the LLB +BERT Test

The LLB +BERT test enables you to initiate a local loopback in order to the local modem. This test will also measure the BER and will display it on the Menu Options field.

To run the LLB+BERT test:






6. Press the SCROLL button until LLB+BERT is displayed.



TESTS

LLB+BERT

REM

PARAMETERS

RLBLLB+BERT

REMLOC


LLB

Figure 6-8. LLB + BERT Menu



TESTS

LLB+BERT ON

LOC

ON

REM

REM

OFF

Figure 6-9. Activating LLB + BERT Test

9. To start the LLB+ BERT test, press the ENTER button when "ON" is displayed. The message WAIT... appears on the local modem screen, followed by an asterisk next to the ON indication. The ERR LED will blink whenever an error is detected and the BER will be displayed on the LCD of both modems.



TESTS

0.00E-9 ON

LOCREM

REM

Figure 6-10. LLB + BERT Test Display


Running the RLB +BERT Test

The RLB +BERT test enables you to initiate a remote loopback in order to test both modems and the line between them. This test will also measure the BER and will display it in the Menu Options field.

To run the RLB+BERT test:






6. Press the SCROLL button until RLB+BERT is displayed.



TESTS

RLB+BERT

LOC

PARAMETERS

RLBLLB+BERT

REMLOC


LLB

Figure 6-11. RLB + BERT Menu



TESTS

RLB+BERT ON

LOC

ON

REM

REM

OFF

Figure 6-12. Activating RLB + BERT Test

9. To start the RLB+ BERT test, press the ENTER button when ON is displayed. The message WAIT... appears on the local modem screen, followed by an asterisk next to the ON indication. The ERR LED will blink whenever an error is detected and the BER will be displayed on the LCD of both modems in the Menu Options field.



TESTS

0.00E-9 ON

LOCREM

REM

Figure 6-13. RLB + BERT Test Display


Be aware that if you try to initiate a new test while a test is still running, the new current test will stop and a new test will start.

Running the BER Test

The BER test is initiated by the user from the local modem. For this test, the modem's internal 511 pattern generator generates a message. The message is sent to the remote modem, and from the remote modem is returned by the remote DTE. When this test is performed, the remote DTE must be in a 511 mode of operation. The local DTE is disabled whenever this test is running.

To run BER test:







TESTS

RLB+BERT PARAMETERS

RLBLLB+BERT

REM

REM

LOC


LLB

Figure 6-14. BERT Menu


6. Press the SCROLL button until BERT is displayed.


8. Use the SCROLL button to toggle between ON and OFF.

TESTS

BERT ON

LOC

ON

REM

REM

OFF

Figure 6-15. Activating BER Test

9. To start the BER test, press the ENTER button when "ON" is displayed. The message WAIT... appears on the local modem screen, followed by an asterisk next to the ON indication. The ERR LED will blink whenever an error is detected and the BER will be displayed on the LCD of both modems.




TESTS

0.00E-9 ON

LOCREM

REM

Figure 6-16. BER Test Display

If you try to initiate a new test (except for BER test) from the local modem or the remote modem, while a test is still running, the TEST ALREADY ON message will appear on the LCD and the new test will not be initiated.

BER tests are the only tests that can be initiated simultaneously from both ends of the line. Each party can initialize his own test and each LCD will display the BERT in the Menu Options field.

Checking the LEDs

The LED check enables you to verify that the LED indicators on the front panel of the modem are operating.

To check the LEDs:






6. Press the SCROLL button until LEDS CHECK is displayed.

Note


6-12 System Messages and Alarms FOMi-40 Ver. 1.0

TESTS

LEDS CHECK PARAMETERS

RLBLLB+BERT

REM

REM

LOC


LLB

Figure 6-17. LEDS CHECK Menu

7. Press the ENTER button to start the LEDs check. All the LEDs initially light for three seconds and then return to their normal operation.

The following applies whenever one of the tests discussed in this section is running:

• The LINE CONFIG menu is disabled and you will be unable to modify the line settings

• In order to start another test, you must stop the test currently running and only then enable a new test

• If you try to start a new test while a test is still running, the TEST ALREADY ON message will be displayed on the LCD

• If you try to run a test while a test is run by the party on the other side of the line, the TEST ALREADY ON message will be displayed on the LCD.

6.2 System Messages and Alarms

System Messages

FOMi-40 responds in real-time to changes in system status. The system messages listed in Table 6-1 override the current menu display and appear, for approximately two seconds on the FOMi-40 front panel LCD.


FOMi-40 Ver. 1.0 System Messages and Alarms 6-13

Table 6-1. FOMi-40 System Messages

Message Meaning

WAIT... The system is updating the database at this time and no other actions can be

taken

U R BEING CONFIG Parameters are being configured by the party at the other side of the line (the

remote modem)

LOC CONFIG ONLY The parameter is modified on the local modem only, since the management

channel is not available

TEST ALREADY ON Activation of test is not valid because another test is performed

NO AUTHORIZATION When configured opposite FOMi-40C, there is no authorization to change

parameters

Alarms

FOMi-40 contains a buffer, which stores the system alarms. When a record of an alarm, or several alarms is stored in the alarm buffer, the ERR LED indicator lights up. Once the alarm's buffer is cleared, the ERR LED turns off. Table 6-2 lists the messages, which can be stored in the FOMi-40 alarm buffer.

Table 6-2. FOMi-40 Alarms

Alarms Description

CONFIG MISMATCH There is a mismatch between the line configuration of both modems

LINE DISCONNECT Warning that line is disconnected; there is no management and DCD overtime

DCD LOSS Line is disconnected

NO MANAGEMENT Management channel is not available

XILINX FAILED The FPGA loaded incorrectly

FREQ. HOPPING When there is no DCD and no management channel for 10 seconds, the modem

"hops" between three frequencies (64 kbps, 1544 kbps and 2048 kbps). The ERR

LED blinks at a rate of 20 times per second to issue a warning

DEF. RATE

64K/1544K/2048K

When the modem "hops" between three frequencies and locks on to one of the

frequencies, a warning about the locked frequency is issued.

NVRAM FAILED The internal modem NVRAM failed

NO INTERFACE The modem does not detect any DTE interface

NO FIBER INTR The modem does not detect any fiber optic interface

ILLEGAL EXT CLK The clock rate detected by the modem is not supported by the modem

IR RATE MISMATCH There are matching rates for each DTE interface. A warning is issued when an

incorrect rate is selected for DTE interface


6-14 Loopback Tests FOMi-40 Ver. 1.0

6.3 Loopback Tests

FOMi-40 supports several types of loopback tests for checking the operation of the data system equipment and its line circuits. These loopbacks test communication between connected equipment, internal circuitry of the local modem and the circuitry of the remote modem.

Before running the loopback tests:

• Verify that the DTE is operating properly and can be used for a test. Do not perform tests with faulty equipment.

• Ensure that all units are powered up and are configured correctly.

Loopback tests are best performed in the order presented in this section.

Local Analog Loopback (LLB)

The local analog loopback (LLB) test checks the performance of the local FOMi-40 modem, the local DTE and the connections between them. It is performed separately at the local and the remote site.

To run an LLB:

Activate the LLB loopback

When LLB is initiated, the TEST LED lights up to indicate that the FOMi-40 digital interface is now operationally connected to the adjacent DTE via most of the modem circuits (see Figure 6-18).

This test can also be activated via the appropriate pin on the DTE interface.

Activation of an LLB via the appropriate pin on the DTE is not available when using X.21B, G.703 or Ethernet interfaces.

If a fault is detected, repeat the LLB test using external BERT equipment. If the BER test indicates an error-free data stream, but the test using DTE indicates a fault, verify that the cable between the DTE and FOMi-40 is not faulty or improperly connected. If the problem persists, follow the DTE manufacturer's test procedures to isolate the fault.

To identify a problem in the communication line:

Perform the LLB test at the remote end of the line.

If both LLB tests are error-free, the fault is in the communication link or in the line interface.

Note


FOMi-40 Ver. 1.0 Loopback Tests 6-15

DTE

FOMi-40

LineInterface

Data

Data

Transmit

Receive

Clock

Clock

Figure 6-18. Local FOMi-40 in Analog Loopback (LLB)

Remote Digital Loopback (RLB)

The remote digital loopback (RLB) test checks the performance of both the local and the remote FOMi-40 units, as well as their connecting lines. The remote digital loopback sets a loop at the remote FOMi-40 modem from the terminal coupled to the local unit (see Figure 6-19).

To run an RLB

Activate the remote digital loopback to initiate loopback at the remote FOMi-40 .

When RLB is initiated, the TEST indicator should light up at both the local and remote units.

This test can also be activated via the appropriate pin on the DTE.

Activation of an RLB via the appropriate pin on the digital interface is not available when using X.21B, G.703 or Ethernet interfaces.

If the RLB test indicates a fault, but the LLB test (see above) was successful in both and remote modems, then the line or line circuits on one side of the line are not functioning properly.

Note


6-16 Loopback Tests FOMi-40 Ver. 1.0

Data

ClockFiber

Fiber

Fiber

FiberClock

Data Receive

ReceiveTransmit

Transmit

LocalDTE

Local FOMi-40 Remote FOMi-40

RemoteDTE

Figure 6-19. FOMi-40 in Remote Digital Loopback (RLB)

Activating Loopbacks from Remote Location

Both LLB and RLB loopbacks can be activated from the remote modem. This option is mainly used when there is an authorized technician at the local site and an unskilled user on the other side.

To activate a loopback from a remote location:

1. Select the remote modem loopback option on the FOMi-40 front panel or PCU.

2. Activate the LLB or RLB loopback (see Chapter 3 for activation instructions). The TEST indicator should light up (see Figure 6-20 and Figure 6-21 for diagnostic loopback data flow).

The remote user should transmit a test data flow and use his own data equipment to check the integrity of the return flow.

Receive

Receive

LocalDTE


Fiber Fiber

Fiber Fiber

Transmit

TransmitData

DataClock

Clock

RemoteDTE

Figure 6-20. Activating the LLB at the Remote Modem


FOMi-40 Ver. 1.0 Running an Internal BER Test 6-17

Receive

ReceiveTransmit

Transmit

Data

Data

Clock

Clock


Fiber Fiber

Fiber Fiber

RemoteDTE

LocalDTE

Figure 6-21. Activating the RLB at the Remote Modem

6.4 Running an Internal BER Test

FOMi-40 has a built-in BER tester and pattern generator. Together with the V.54 diagnostic loops and a remote BER tester, you can verify normal system operation and isolate faulty equipment in the event of system failure.

The pattern generator activates automatically when you enable the BER tester. It sends a 511 pattern according to the ITU V.52 standard. If errors are detected by the BER tester, the ERR LED indicator blinks or remains ON. Figure 6-22 illustrates the data flow for the operation of the internal BER tester and the pattern generator.


Fiber Fiber Receive

TransmitFiber Fiber

ERR

PatternGenerator

PatternTester

LocalDTE

RemoteDTE

Figure 6-22. Running BER Test

The BER test can be activated simultaneously on both the local modem and the remote modem. This allows you to check the integrity of the link from both sides of the application at the same time.


6-18 Troubleshooting FOMi-40 Ver. 1.0

6.5 Troubleshooting

This section lists some possible failures, and describes their symptoms and the corrective measures the user should take in order to overcome these failures.

Table 6-3 lists the failures and the required corrective actions.

Table 6-3. Troubleshooting Chart

No. Symptom Possible Failure Corrective Action

1 Power LED is Off. Blown fuses Replace the fuses.

The fuse on a standalone AC unit is on

the rear panel.

On a standalone DC unit the fuses are

on the PCB, close to the power input

connector.

2 ERR LED is lit and CONFIG

MISMATCH alarm is stored in

the alarm buffer.

The parameters set for

both modems are not

identical.

Set the parameters on both modems

by using the CONFIG MATCHING option

or manually parameter by parameter.

3 ERR LED is lit and LINE

DISCONNECT alarm is stored in

the alarm buffer.

The line between the

modems is not

connected properly.

Check that the line is properly

connected.

4 ERR LED is lit and DCD LOSS

alarm is stored in the alarm

buffer.


modems is not

connected properly.


connected.

5 ERR LED is lit and NO

MANAGEMENT alarm is stored in

the alarm buffer.


modems is connected

improperly; or modem is

in FOM-40 (I Type-No).


connected.

6 ERR LED is lit and NVRAM

FAILED alarm is stored in the

alarm buffer.

Hardware failure Replace the unit.

7 ERR LED is lit and NO INTERFACE

alarm is stored in the alarm

buffer.

No DTE interface, or a

DTE interface, which is

not supported by the

modem.

Connect a DTE interface, which is

supported by the modem.

8 ERR LED is lit and NO FIBER

INTERFACE alarm is stored in

the alarm buffer.

No fiber optic interface,

or a fiber optic interface,

which is not supported

by the modem.

Connect a fiber optic interface, which

is supported by the modem.

9 ERR LED is lit up an ILLEGAL EXT

CLK alarm is stored in the Alarm

Buffer.

There is no external clock

or the external clock

frequency is not

supported by the

modem.

Check that an external clock is

connected to the modem and that its

frequency is one of those supported

by the modem.


FOMi-40 Ver. 1.0 Frequently Asked Questions 6-19

No. Symptom Possible Failure Corrective Action

10 ERR LED is lit up and XILINX

FAILED alarm is stored in the

Alarm Buffer.

Hardware failure Replace the unit.

11 On Power-Up Power LED lights

up and ERR LED blinks in a rate

of 20 times per second.

Line disconnected. The

modem switched to

frequency hopping

(64 kbps, 1544 kbps,

2048 kbps).

Check the line.

12 ERR LED is lit up and IR RATE

MISMATCH alarm is stored in

the Alarm Buffer.

The rate set for modem

does not match the DTE

interface.

Change the rate so that it matches the

DTE interface.

6.6 Frequently Asked Questions

This section contains some of the questions asked most frequently of FOMi-40 technical support.

Q. What is the maximum range of the FOMi-40 modem?

This depends on the properties of the fiber optic line used. In general, the output power of a modem with a 1550 nm laser will be -12 dBm; the receiver sensitivity is -40 dBm. Therefore, the optical budget will be 28 dBm. Deduct 3 dB for the aging factor, and you net an optical budget of 25 dB.

Now, if you use a single mode 9/125 fiber with an attenuation factor of 0.2–0.3 dB/km, you get a maximum range of 83–125 km. This range tends to decrease when the optical fiber is spliced or when connectors are added to the line.

In summary, the optical budget considers the following six factors:

• The power of the laser

• The sensitivity of the receiver

• An adjustment for aging

• The attenuation factor characteristic of the fiber optic line you are using

• An adjustment for connectors and splices in the line as installed.


6-20 Technical Support FOMi-40 Ver. 1.0

Q. How precise is the FOMi-40 clock in ppm? Please answer for external and internal clock functions?

• External clock: FOMi-40 can handle an external clock signal with a precision of ±100 ppm.

• Internal clock: When FOMi-40 is in internal clock mode, it provides a clock with a precision of ±0 ppm. This is due to the final calibration process it undergoes in the lab before shipment.

Q. Can I use a FOMi-40 with a multimode 850 nm interface with single mode (1310 nm or 850 nm) infrastructure?

Do not use the 850 nm optical interface with single mode optical fiber.

However, you can use FOMi-40 with a 1310 nm or 1550 nm interface with:

• Single mode fiber at any distance

• Multimode fiber at long distances (at short distances, there will be a problem with saturation).

6.7 Technical Support

Technical support for this product can be obtained from the local distributor from whom it was purchased.

For further information, please contact the RAD distributor nearest you or one of RAD's offices worldwide. This information can be found at www.rad.com (offices – About RAD > Worldwide Offices; distributors – Where to Buy > End Users).

http://www.rad.com/

FOMi-40 Ver. 1.0 V.24, V.35, X.21 and RS-530 DTE Interface Connectors A-1

Appendix A

Pinouts

A.1 V.24, V.35, X.21 and RS-530 DTE Interface Connectors

Table A-1 lists the pin assignments of the V.24/RS-232, V.35, X.21 and RS-530 interface connectors.

Table A-1. DTE Interface Signal Assignments

V.24 V.35 RS-530 X.21 Description Signal

Function DB-25

Standalone

and Card

Cage

DB-25

Card

Cage

34-Pin

Standalone

Pin Circuit

DB-25

Standalone and

Card Cage

Pin Circuit

DB-25

Card

Cage

DB-15

Standalone

Pin Circuit

(Function)

Protective

Ground

1 1 A Frame 101 1 1 1 ----

(Shield)

Chassis Ground. It

may be isolated

from Signal

Ground.

Signal

Ground

7 7 B Signal 102

GND

7 AB 7 8 ----

(GND)

Common signal

and DC power

supply ground.

Transmitted

Data

2 9

11

P TD(A) 103

S TD(B) 103

2 BA(A)

14 BA(B)

2

14

2 T(A)

9 T(B)

(Transmit)

Serial digital data

from DTE. In sync

applications, the

data translations

must occur on the

rising edge of the

transmit clock.

Received

Data

3 12

13

R RD(A) 104

T RD(B) 104

3 BB(A)

16 BB(B)

3

16

4 R(A)

11 R(B)

(Receive)

Serial output

from the modem

receiver. In sync

applications, the

data translations

occur on the

rising edge of

the clock.

Appendix A Pinouts Installation and Operation Manual

A-2 V.24, V.35, X.21 and RS-530 DTE Interface Connectors FOMi-40 Ver. 1.0


Function DB-25

Standalone

and Card

Cage

DB-25

Card

Cage

34-Pin

Standalone

Pin Circuit

DB-25

Standalone and

Card Cage

Pin Circuit

DB-25

Card

Cage

DB-15

Standalone

Pin Circuit

(Function)

Request to

Send

4 4 C RTS 105 4 CA(A)

19 CA(B)

4

19

3 C(A)

10 C(B)

(Control)

A positive level to

FOMi-40 when

data transmission

is desired.

Clear to Send 5 5 D CTS 106 5 CB(A)

13 CB(B)

A positive level

from FOMi-40 with

delay, after receipt

of Request to

Send, and when

FOMi-40 is ready

to transmit.

Data Set

Ready

6 6 E DSR

107

6 CC(A)

22 CC(B)

A positive level

from FOMi-40

when power is on,

and FOMi-40 is (a)

not in DIGITAL

LOOP mode, or (b)

has not received a

REMOTE LOOPBACK

signal from the

remote unit.

Data

Terminal

Ready

20 20 H DTR 108 20 CD(A)

23 CD(B)

Not used

Carrier

Detect

8 8 F DCD 109 8 CF(A)

10 CF(B)

8

10

5 I(A)

12 I(B)

(Indication)

A positive level

from FOMi-40,

except when a loss

of the received

signal is detected

or when Data Set

Ready is negative.

External

Transmit

Clock

24 19

16

U SCTE(A) 113

W SCTE(B) 113

24 DA(A)

11 DA(B)

24

11

7 (A)

14 (B)

A serial data rate

clock input from

the data source.

Positive clock

translations must

correspond to data

transmissions.

Installation and Operation Manual Appendix A Pinouts

FOMi-40 Ver. 1.0 V.24, V.35, X.21 and RS-530 DTE Interface Connectors A-3


Function DB-25

Standalone

and Card

Cage

DB-25

Card

Cage

34-Pin

Standalone

Pin Circuit

DB-25

Standalone and

Card Cage

Pin Circuit

DB-25

Card

Cage

DB-15

Standalone

Pin Circuit

(Function)

Transmit

Clock

15 14

10

Y SCT(A) 114

a SCT(B) 114

15 DB(A)

12 DB(B)

15

12

6 S(A)

13 S(B)

(Signal Timing)

A transmit data

rate clock for use

by an external data

source. Positive

clock translations

correspond to data

translations.

Receive Clock 17 23

22

V SCR(A) 115

X SCR(B) 115

17 DD(A)

9 DD(B)

A receive data rate

clock output used

by an external data

sink. Positive clock

translations

correspond to data

translations.

Local Analog

Loop

18 18 L and j 18 LL A control signal

input, which, when

on, sets FOMi-40

into Local Analog

Loopback

(V.54 Loop 3).

Remote

Digital Loop

21 21 N and h 21 RL A control signal

input which, when

on, commands

FOMi-40 to send a

remote Loopback

command (V.54

Loop 2) to the

remote FOMi-40.

Test Indicator 25 25 n and k 25 TM A Control Signal

output from

FOMi-40; positive

during any test

mode.

Appendix A Pinouts Installation and Operation Manual

A-4 V.36 Interface Connector FOMi-40 Ver. 1.0

A.2 V.36 Interface Connector

The FOMi-40 V.36 interface is provided via an adapter cable converting between 25-pin RS-530 connector and 37-pin V.36 connector. Table A-2 lists the cable wiring.

Table A-2. Cable Converting between RS-530 and V.36 Interfaces, Pin Assignment

Signal Function V.36 RS-530

Pin Circuit Pin Circuit

Protective Ground 1 Shield 1

Signal Ground 19 SG 7 AB

DTE Common Return 37 SC

DCE Common Return 20 RC

Transmitted Data 4

22

SD (A)

SD (B)

2

14

BA (A)

BA (B)

Received Data 6

24

RD (A)

RD (B)

3

16

BB (A)

BB (B)

Request to Send 7

25

RS (A)

RS (B)

4

19

CA (A)

CA (B)

Clear to Send 9

27

CS (A)

CS (B)

5

13

CB (A)

CB (B)

Data Set Ready 11

29

DM (A)

DM (B)

6

22

CC (A)

CC (B)

Data Terminal Ready 12

30

TR (A)

TR (B)

20

23

CD (A)

CD (B)

Carrier Detect 13

31

RR (A)

RR (B)

8

10

CF (A)

CF (B)

External Transmit

Clock

17

35

TT (A)

TT (B)

24

11

DA (A)

DA (B)

Transmit Clock 5

23

ST (A)

ST (B)

15

12

DB (A)

DB (B)

Receive Clock 8

26

RT (A)

RT (B)

17

9

DD (A)

DD (B)

Local Analog

Loopback

10 LL 18 LL

Remote Loopback 14 RL 21 RL

Test Indicator 18 TM 25 TM

FOMi-40 Ver. 1.0 Introduction B-1

Appendix B

IR-ETH/QN Interface Module

B.1 Introduction

The IR-ETH/QN interface module includes a high performance self-learning Fast Ethernet bridge, which is connected to the LAN via a single 10BaseT or 100BaseT port, operating in full- or half-duplex and providing simple and cost-effective interconnection between 10/100BaseT LANs. The IR-ETH/QN interface module also supports IEEE 802.1/P frames and IEEE 802.1/Q frames, enabling VLAN applications.

The module automatically learns MAC addresses of the LAN to which it is connected. Its LAN table stores up to 1,024 addresses with 5-minute automatic aging.

Filtering and forwarding is performed at the maximum theoretical rate of 150,000 packets per second (wire speed). The buffer with 0.512 Mbit SRAM can hold 85 frames with a throughput latency of one frame. The forwarding of the multicast messages from LAN to WAN can be disabled.

Figure B-1 shows a typical application using FOMi-40 with IR-ETH/QN module.

FOMi-40 FOMi-40

Fiber Optic Cable

Figure B-1. Typical Application of FOMi-40 with IR-ETH/QN Module

Appendix B IR-ETH/QN Interface Module Installation and Operation Manual

B-2 Technical Specifications FOMi-40 Ver. 1.0

B.2 IR-ETH/QN Connector

Figure B-2 shows the rear panel of FOMi-40, equipped with IR-ETH/QN module. Table B-1 lists the module's RJ-45 connector pinout.

TX RX

ACT LINK 100M

IR-ETH/QN

Figure B-2. Rear Panel of FOMi-40 with IR-ETH/QN Module

Table B-1. RJ-45 Connector Pinout

Pin Signal Function

1 RD (+) Receive Data (positive)

2 RD (-) Receive Data (negative)

3 TD (+) Transmit Data (positive)

6 TD (-) Transmit Data (negative)

B.3 Technical Specifications

Bridge LAN Table 1,024 MAC addresses

Aging 5 minute, automatic

Filtering and Forwarding Rate

150,000 packets per second

Buffer Size 85 frames

Delay 1 frame

LAN Standard IEEE 802.3/Ethernet V.2, IEEE 802.1q (relevant parts), 802.1p, 802.3x

Data Rate • 10BaseT: 10 Mbps (20 Mbps in full-duplex)

• 100BaseT: 100 Mbps (200 Mbps in full-duplex)

Transmission Line 4-wire, Category 5 UTP, 19 AWG to 26 AWG

Installation and Operation Manual Appendix B IR-ETH/QN Interface Module

FOMi-40 Ver. 1.0 Installation and Operation B-3

Line Code • 10BaseT: Manchester

• 100BaseT: MLT3

Connector RJ-45

WAN Protocol Point-to-point

Data Rate Up to 2048 kbps

B.4 Installation and Operation

To set the internal switch on the IR-ETH/QN interface board, you have to open the FOMi-40 case. Figure B-3 illustrates default settings of the SW1 and SW2 DIP switches, as detailed in Table B-2 and Table B-3

SW2 ON

5.6.

4.3.2. AN

FDXBPRMULNC

1. 100

SW1

5.

7.6.

8.

4.3.2. LC1

LC2FLCNC

NCNC

NC

1. MDI

ON

Figure B-3. Location of DIP Switches SW1 and SW2

Setting the DIP Switches

Configure the IR-ETH/QN module by setting the DIP switches SW1 and SW2 in accordance with Figure B-3, Table B-2 and Table B-3.

To make the changes effective, you have to restart the FOMi-40 unit by turning it off and on.

Note


B-4 Installation and Operation FOMi-40 Ver. 1.0

Table B-2. DIP SW1 Switch Settings

Section Name Description Settings (Factory setting in bold)

1 MDI Enables or disables

automatic MDI/MDIX

crossover

ON – Automatic MDI/MDIX crossover is enabled

OFF – Automatic MDI/MDIX crossover is disabled

Note: Automatic MDI/MDIX crossover function is available only if the autonegotiation is enabled (see Table B-3).

2 LC1 – Permanently set OFF at the factory

3 LC2 – Permanently set ON at the factory

4 FLC Enables or disables flow

control

ON – Flow control is enabled

OFF – Flow control is disabled

5-8 NC – Permanently set OFF at the factory

Sections 2, 3, 5, 6, 7 and 8 of the SW1 DIP switch are factory-set and must not be moved by the user.

Table B-3. DIP Switch SW2 Settings

Section Name Description Settings (Factory setting in bold)

1 100 Selects the LAN speed ON – LAN speed is set to 10 Mbps

OFF – LAN speed is set to 100 Mbps

2 AN Controls the LAN

autonegotiation

ON – LAN autonegotiation is disabled

OFF – LAN autonegotiation is enabled

3 FDX Selects the LAN mode ON – LAN half duplex mode

OFF – LAN full duplex mode

4 BPR Controls the backpressure ON – Backpressure is enabled

OFF – Backpressure is disabled

5 MUL Controls LAN to WAN

multicasting

ON – Multicast messages from LAN to WAN are not blocked

OFF – Multicast messages from LAN to WAN are blocked

6 NC – –

• Section 6 of the SW2 DIP switch is factory-set and must not be moved by the user.

• When autonegotiation is enabled, LAN speed and LAN mode are configured automatically (sections 1 and 3 are disabled).

Note

Note

Installation and Operation Manual Appendix B IR-ETH/QN Interface Module

FOMi-40 Ver. 1.0 Installation and Operation B-5

LED Indicators

Table B-4 lists the IR-ETH/QN rear-panel LED indicators and describes their functions.

Table B-4. LED Indicators

LED Name Color Description Location

LINK Green ON – LAN is connected to the IR-ETH/QN module Connector

ACT Yellow ON – LAN is receiving/transmitting data Connector

100M Green ON – LAN is operating at 100 Mbps

OFF – LAN is operating at 10 Mbps

Panel

The front panel RTS LED indicates the LAN speed:

• ON – LAN speed is 10 Mbps (full- or half-duplex) • OFF – LAN speed is 100 Mbps (full- or half-duplex).

Connecting the LAN

Use either a straight cable or a cross cable for the LAN connection. Use a cross cable when connecting to a port that does not implement the crossover function internally. Otherwise, use a straight cable.

Hubs usually implement the crossover function internally, while NICs and other devices do not.

Note

Note


B-6 Installation and Operation FOMi-40 Ver. 1.0

FOMi-40 Ver. 1.0 IR-E1/G703 Connector Options C-1

Appendix C

IR-E1/G703 Interface Module

IR-E1/G703 is an interface module for the FOMi-40 modems that converts G.703 E1 unframed signals to TTL levels. The converted data is sent over the modem link using the modem's modulation technique. It is then converted back at the other end into G.703 E1 at 2048 kbps signals.

C.1 IR-E1/G703 Connector Options

The IR-E1/G703 interface module fits into a standalone modem, and is available with two types of physical connections: RJ-45 for balanced twisted pair connection and BNC for unbalanced coaxial connection. Figure C-1 illustrates the FOMi-40 rear panel with IR-E1/G703 interface module. Table C-1 lists the RJ-45 connector pinout.

TX RX

G.703 E1

TX OUT RX IN

Figure C-1. Rear Panel of FOMi-40 with IR-E1/G703 Module

Table C-1. RJ-45 Connector Pinout

Pin Name Function

1 RX (+) Receive Data Positive

2 RX (-) Receive Data Negative

4 TD (+) Transmit Data Positive

5 TD (-) Transmit Data Negative

Appendix C IR-E1/G703 Interface Module Installation and Operation Manual

C-2 Configuring IR-E1/G703 FOMi-40 Ver. 1.0

C.2 Configuring IR-E1/G703

Figure C-2 illustrates the IR-E1/G703 interface module layout. Table C-2 describes the IR-E1/G703 jumper settings.

JP1

JP4

JP3

JP7

JP5

JP6

JP2

RX CHAS

TX CHAS

DIS

DIS

BAL

BAL

UBAL

UBAL

EXT INT/RCV

CON

CON

Figure C-2. IR-E1/G703 Layout

Table C-2. IR-E1/G703 Module Jumper Settings

Jumper Function Settings (Factory setting in bold)

JP1

RX CHAS

Controls connection between the RX

BNC shield and the chassis ground

CON – BNC receive shield is connected to the

chassis ground

DIS – BNC receive shield is disconnected from the

chassis ground

JP3

TX CHAS

Controls connection between the TX

BNC shield and the chassis ground

CON – BNC transmit shield is connected to the

chassis ground

DIS – BNC transmit shield is disconnected from

the chassis ground

JP2, JP4, JP5, JP6

BAL/UBAL

Select between the IR-E1/G703

interface type

BAL – Balanced 120Ω RJ-45 connection

UBAL – Unbalanced 75Ω BNC connection

JP7

Clock Mode

Selects the clock source for the IR-

E1/G703 module

INT/RCV – IR-E1/G703 module receives clock from

the modem

EXT – IR-E1/G703 module receives clock from the

E1 network

Note: Use only default (EXT) setting for all clock modes.

FOMi-40 Ver. 1.0 Introduction D-1

Appendix D

IR-G.703/CO Interface Module

D.1 Introduction

IR-G.703/CO is an interface module for RAD modems, converting G.703 64 kbps codirectional signals to TTL levels. The converted data is sent over the modem link using the modem modulation technique and converted back at the other end into G.703 64 kbps codirectional signals, or into any other digital interface signal possible. IR-G.703/CO is available with two types of physical connections: a terminal block or an RJ-45 (see Table D-1 for the RJ-45 connector pinout).

Figure D-1 illustrates the rear panel of the FOMi-40 modem equipped with the IR-G.703/CO interface module.

TX RX

XMTRCVGND

Figure D-1. Rear Panel of FOMi-40 with IR-G.703/CO Module

Table D-1. RJ-45 Connector Pinouts

Pin Function

3 RCV (+)

6 RCV (-)

4 XMT (+)

5 XMT (-)

2 GND

For the G.703 codirectional interface, byte sync is not kept end-to-end. A violation bit that is inserted every 8 bits does not appear in the same location at the remote side.

Note

Appendix D IR-G.703/CO Interface Module Installation and Operation Manual

D-2 Selecting the IR-G.703/CO Timing FOMi-40 Ver. 1.0

D.2 Selecting the IR-G.703/CO Timing

The IR-G.703/CO interface module can operate with EXT or INT/RCV timing to match the clock reference of the FOMi-40 modem. The clock selection is made via the JP1 jumper located on the module board (see Figure D-2).

JP1INT/RCV

EXT

Figure D-2. JP1 Location on the IR-G.703/CO Board

EXT Timing

The EXT clock is used in applications, where the system timing is provided by the G.703 network. The IR-G.703/CO module has an internal buffer to compensate for the phase delay introduced to the system by the line delay between the two modems. The buffer is an 8-bit FIFO connected as shown in Figure D-3.

You must configure the IR-G.703/CO module to the EXT clock if the FOMi-40 modem is also set to the external timing.

Timing Source

TX DataTX

TX

RX

RXRX Data

G.703Codirectional

64 kbps Network

FIFO

EXT Clock Mode RCV Clock Mode

Clock In

ClockOut

Modem A Modem B

ClockRecoveryData

DataCLK

ClockRecovery

FIFO

IR-G.703 Module

ClockRecovery

Figure D-3. IR-G.703/CO EXT Timing

Installation and Operation Manual Appendix D IR-G.703/CO Interface Module

FOMi-40 Ver. 1.0 Selecting the IR-G.703/CO Timing D-3

INT/RCV Timing

The INT/RCV clock is used in applications where the G.703 codirectional 64 kbps equipment connected to the modem recovers the clock signal from the modem link. This mode is used mainly when the attached equipment has a G.703 codirectional interface, but is not able to produce clock signals. The module has an 8-bit FIFO buffer to compensate for the phase delay introduced by the G.703 device. Figure D-4 illustrates the buffer connection and the required application setup.

You must configure the IR-G.703/CO module to the INT/RCV clock if the FOMi-40 modem is set to the internal or receive timing.

TX

RX RX Data

TX Data

TX

RX

INT or RCVClock Mode

EXT, INT or RCVClock Mode

(Depending on theattached network)

Modem A

Equipmentwith G.703Interface

LINKSide

G.703Side

DTESide

INT/RCV Clock Mode

Modem B

Clock In

ClockOut

IR-G.703 Module

Data

ClockRecovery

FIFO

ClockRecovery

DataCLK

FIFO

Figure D-4. IR-G.703/CO INT/RCV Timing

Appendix D IR-G.703/CO Interface Module Installation and Operation Manual

D-4 Selecting the IR-G.703/CO Timing FOMi-40 Ver. 1.0

FOMi-40 Ver. 1.0 Introduction E-1

Appendix E

IR-X.21B Interface Module

E.1 Introduction

IR-X.21B is an interface module for RAD modems, converting X.21 signals to TTL levels. The converted data is sent over the modem link, using the modem modulation technique, and is converted back at the other end into X.21 signals, or into any other digital interface signal.

Figure E-1 shows a typical application of FOMi-40 with IR-X.21B interface module.

FOMi-40 FOMi-40

Fiber Optic Cable

Router Router

X.21 X.21

Figure E-1. Typical Application of FOMi-40 with IR-X.21B Module

Standalone FOMi-40 Connector

Figure E-2 shows the rear panel of FOMi-40 equipped with the IR-X.21B interface module. Table E-1 lists the module DB-15 connector pin assignment.

TX RX

Figure E-2. Rear Panel of FOMi-40 with IR-X.21B Module

Table E-1. IR-X.21B Connector Pin Assignment

Pin ID Function

1 Shield Chassis connection

2 A Transmit signal A

3 A Control A

4 A Receive A

5 A Indication A

6 A Signal timing A

Appendix E IR-X.21B Interface Module Installation and Operation Manual

E-2 Selecting the IR-X.21B Timing FOMi-40 Ver. 1.0

Pin ID Function

7 A External Timing

8 GND Common

9 B Transmit B

10 B Control B

11 B Receive B

12 B Indication B

13 B Signal Timing B

14 B External Timing

E.2 Selecting the IR-X.21B Timing

IR-X.21B interface module supports two clock modes:

• EXT (External)

• INT/LBT (Internal/Receive).

You must set the IR-X.21B clock to match the timing you have selected for the FOMi-40 modem. The clock settings are made via the JP2 jumper located on the IR-X.21B board, as shown in Figure E-3.

JP2

EXT INT/LBT

Figure E-3. IR-X.21B Module Layout

Installation and Operation Manual Appendix E IR-X.21B Interface Module

FOMi-40 Ver. 1.0 Selecting the IR-X.21B Timing E-3

EXT Clock Mode

The EXT clock mode is used in applications of X.21 networks where the system timing is provided by the X.21 network. The IR-X.21B module has an internal 16-bit FIFO buffer to compensate for the phase delay introduced to the system by the line delay between the two modems. Figure E-4 illustrates the buffer connection and the flow of the receive, transmit and clock signals.

When the FOMi-40 modem operates in the external clock, you must set the IR-X.21B JP2 jumper to EXT.

IR-X.21B

Modem DTE

TXDTXD

TXC

ETC

ETC

RXC

RXD RXD

Signal Timing (RXC)

(2, 9)

(7, 14)

(4, 11)

(6, 13)

FIFO Buffer

Rx

FIFO Buffer

Tx

Figure E-4. EXT Timing Mode

INT/LBT Clock Mode

The INT/LBT clock mode is used in applications where the IR-X.21B side uses the clock signal from the modem link. This mode is used mainly when the attached equipment has an X.21 interface, but no ability to produce clock signals. The module has a 16-bit FIFO buffer to compensate for the phase delay introduced by the X.21 device. Figure E-5 illustrates the buffer connection and the flow of the receive, transmit and clock signals.

When the FOMi-40 modem operates in the internal or receive clock, you must set the IR-X.21B JP2 jumper to INT/RCV.

IR-X.21B

Modem DTE

TXDTXD

TXC

RXC

RXD RXD

Signal Timing (RXC)

(2, 9)

(4, 11)

(6, 13)

FIFO Buffer

Rx

FIFO Buffer

Tx

Figure E-5. INT/LBT Timing Mode

Appendix E IR-X.21B Interface Module Installation and Operation Manual

E-4 Selecting the IR-X.21B Timing FOMi-40 Ver. 1.0

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