tct-3 programmable digital drop-insert e1 multiplexers

TCT-3

Programmable Digital Drop-Insert

E1 Multiplexers

WEBFIL‘S FLEXI MUX

Chapter 1

Webfil Fleximux Programmable

Digital Drop-Insert E1 Multiplexers

Webfil Fleximux

The Fleximux is a programmable Add/Drop multiplexing equipment

It combines voice and data traffic into a 2.048 Mbps stream. This equipment is manufactured and supplied by

Webfil Limited. The Add/Drop feature of the Fleximux is realized

through the use of a high performance time/space non-blocking cross-connect switch

It has four independently controlled serial time division multiplexed buses.

Conferencing of voice is done through a separate

digital signal processing circuit in digital format.

All the signaling information is handled by a

microcontroller.

Digital Conference is done on any three voice slots in

a separate digital signal processor.

Conference can be three way (full conference) or two

and half way(semi-conference) as required by the

user.

Webfil Fleximux

Basic Flexi-MUX Sub-rack / Front Panel

PS

U

Au

xilia

ry

PS

U

NE

TW

OR

K

INT

ER

FAC

E

Module

T

RIB

UT

AR

Y

Module

Slots for Channel Access Module

TS

1 to

TS

4

TS

5 to

TS

8

TS

9 to

TS

12

TS

13

to

TS

17

TS

18

to

TS

21

TS

22

to

TS

25

TS

26

to

TS

29

TS

30

& T

S 3

1

TS

30

& T

S 3

1

J2

J6

J1

J5

P23

J15

P32 P31 P30 P29 P28 P27 P26 P25 P24

NMS PORT

J13

J16

Port # B

External

Clock

Input

Power

Supply

Socket

Equipment

Earthing

Chl Chl Chl Chl Chl

17 13 9 5 1

to to to to to

20 16 12 8 4

Chl Chl Chl Chl

29 29 25 21

& & to to

30 30 28 24

Basic Flexi-MUX Sub-rack / Rear Panel

Port # A

OUT/75Ω OUT/120Ω IN/75Ω

IN/120

Ω

J10 J9

Port # C

Access to the 2 Mb ports are available from the back plane from the rear side

Separate connectors are available for 75 ohms &

120 ohms impedance matching

The back plane also provided a D-shell 9 pin

connector for interfacing the V-24/RS232 serial link of NMS

NMS can also be accessed from RJ11 jack located

at the front of NIM

Webfil Fleximux

System Architecture of Flexi-MUX

Network

Interface

Module

Tele signal

Inputs (4)

Tele

command

Outputs (2)

Network

Interfac

e RS232C/RJ11

Tributary

Module

Tributary

Port# A Port# B

Power Supply

HSB (1+1)

-48 V, DC

A: Adaptor Modules a. 4W/2W E&M b. Subscriber/Hotline Interface c. Exchange Interface

A

Voice

Interface

Low speed Data

1200-19.2K

V.24/RS232C

High Speed Data

64 Kbps

G.703/V.35/V.36

Broadband Data

nX64 Kbps

V.35/V.36 A A A A

IDSL

64/128 Kbps

“U” Interface

E1 Branching

2.048 Mbps

75/120 Ω

+5V +10V -10V

+80

V

Power Supply Module

The power supply unit operates from -48V supply

The input power is fed through a surge protector

and a filter section to protect the system from

high voltage spikes and lightening Spikes coming

along the power line

The out puts are +5V, ± 10V and +80V

Three outputs are mutually isolated with each other

The card has under-voltage and over-voltage alarm

for both input and output

Network Interface Module (NIM)

The Network Interface Module primarily takes care

of alarm acquisition function

It collects alarms from various internal and external

sources and responds to the queries and

commands issued by the Network Manager through

the ―Super Net‖ Network Management System

The Network Interface module is used for exchange

of information among the Network Manager, the

Tributary Module and the various access modules

interconnected via the back plane.

It has altogether four communication interfaces

for information exchange.

The network management system is realized

through two serial interfaces, one for external

NMS for interfacing the central supervisory

computer while the other is used for realizing the

NMS through the unused National bits of the 2

MB stream.

Other than these, the tributary unit is

interconnected through a serial link while the

access modules are interfaced through another

serial bus.

Network Interface Module(NIM)

Tributary Module & its functions

The Tributary Module is the heart of the system which

interfaces to the 2 Mbps stream and realizes the add-

drop function of the channel through digital cross-

connect

Extract the master clock (MCLK) of the Network from

the incoming 2 Mbps streams. The node is made

synchronized to the MCLK.

Synchronize the phase of the incoming 2 Mbps streams

and also that of the internal 2 Mb bus for local access.

Cross-connect 64 Kbps digital data along with signaling

data.

Perform PCM summing of Conference channels along with logical summing of corresponding signaling data.

Generate 2 Mbps internal TDM bus for channel units.

Generate 2 Mbps HDB-3 encoded interface signal

complying with ITU-T G.703.

Collect and analyze equipment and line faults and take necessary actions.


Control jitter to a limit well below the ITU-T limit

(G.823).

Report to Network Interface module about alarm status of E1 stream & module

Support a communication channel through the use of National bits of TS0 for Network Monitoring and Control.


Voice Access Module

The ultimate objective of the Flexi MUX is to add/drop

selective time slots from the time multiplexed 2 Mb

data stream for local access of voice and/or data.

Each access modules accommodates four channels

per card

The following standard interfaces are supported by

the Voice Access Module.

2W/4W E&M Interface

Subscriber Interface

Exchange Interface

Hot Line Interface

Voice Access modules(2W/4W E&M Interface)

For 4W interface circuit, the voice is extended through a

pair of balance line for both transmit and receive.

Separate line transformers are used for this purpose.

The impedance is matched for 600 ohms.

Signaling is provided by separate E and M leads.

M lead provides the incoming signaling which is sensed

by an opto-isolator.

Voice Access modules(2W/4W E&M Interface)

The user‘s equipment normally extends earth or no-

earth which is sensed by the opto-isolator against

the primary -48V.

E-lead provides the outgoing signaling and it

extends earth or no-earth through a transistor

acting as a solid- state switch.

For 2W interface of voice, both the trans and receive

voice is fed to the outgoing transformer working in

hybrid mode.

Subscriber interface is normally used for extending a

voice to the plain old telephone sets (POTS).

In this interface both the signaling and voice is sent

over one pair of wire.

The unit provides talk current from the primary – 48V

source for the operation of the telephone set.

Hook condition and dial pulses are sent by

interrupting the loop current in the handset.

The interface also has built-in ringer to buzz the

phone for incoming calls.

Voice Access modules (Subscriber interface/ Hotline interface)

Mode Jumper Pins

Subs E1, E2, E3, E5 2, 3

E4 3, 4

Hotline E1, E2, E3, E4, E5 1, 2

Hot line is basically subscriber to subscriber interface.

Depending on the off-hook status at one end, the ringer is

activated at the other end. The ringer is automatically

deactivated as soon as the handset is lifted.

After the conversation is over, both the user will have to

comeback to the on-hook condition to enable the ring

again. To make the subscriber work as hotline or vice versa

following jumper settings are to be done.

Voice Access modules (Subscriber interface/ Hotline interface)

This interface is used for interfacing the exchange

side of a subscriber line.

Depending on the hook status of the subscriber,

the exchange interface extends loop to the

exchange.

It basically emulates the function of the telephone

to the exchange and reproduces the voice and

signaling of the telephone set.

It also senses the ring and loop reversal condition

which is sent to the subscriber interface for

reproduction.

Voice Access modules (Exchange Interface)

One 64 Kbps data card caters for two 64 Kbps co-

directional data channel which conforms to ITU-T G703

requirement.

Each channel consists of a general purpose line

interface chip (XR-T6164).

It contains both transmit and receive circuitry to interface

TTL signal either from or to a twisted pair cable in

conjunction with the XR-T6l64,

The XR-T6165 will form a ITU-T G.703 compatible 64

Kbps data adaptation unit, interfacing between 2048

Kbps PCM highway and a variable length twisted pair

cable.

Data Access modules (64 Kbps (G.703) data interface)

The Low Speed Data Module is primarily meant for

extending asynchronous low speed RS232C data

circuits through the flexi mux.

The module works in bit transparent mode and

acts as a data pipe irrespective of the data.

It can also work in synchronous mode in which

case the incoming and outgoing data will have to

be synchronized to the clock signal provided by

the module (contra directional data).

Data Access modules

(Low speed digital data module)

Each time slot of the 2 MB frame provides a bit rate of

64Kbps.Low speed data channels can very well be

accommodated into such a high bit rate channel. However, for better utilization of the information

bandwidth a V.110 sub-multiplexing format is used to

support multiple low speed data on a single time slot.

This module supports baud rate ranging from 600

baud to 19.2K baud. The no. of bits of a time slot

required is Up to 4800 baud

9600 baud

19.2K baud

1 bit

2 bits

4 bits

Time slots TS30 and TS31 are extended to slots

12&13 slots of sub rack

Data Access modules

(Low speed digital data module)

It creates a third tributary by cross connecting the required time slots from Trib-A or Trib-B to Trib-C.

By this module it is possible to create a spur link by diverting the required time slots without dropping channels at voice/data level.

All the NMS functions are available in spur link

Access modules / E1 branching module

Digital Subscriber Line Module

It is designed to provide ISDN basic rate access (2B+D) at U-interface

NX64 data Module

Designed to extend the WAN-based data network or video conferencing circuits through primary mux.

It works in synchronous mode with V.35 interface

with clock slaved from data communication equipment.

The module supports configuration from 64Kbps

(N=1) up to 1920Kbps(N=30)

Access modules

Webfil Super net Management System (WSMS) Version

4.0, is a window based network management system

(NMS)

Designed to configure and control FLEXIMUX Equipment.

It can process information, in real time mode, received

from all fleximux equipments connected in a network.

With the help of this software, one can also monitor health

of a particular equipment and network.

Network management & Supervision

Programmable Features

Configuration of different Access Module as per

Interface and requirement

Assignment of Channel Cross-connect table

Configuration of channel assignment for various

alarm conditions

Designation of external alarm as major/minor alarm


Monitoring Features

All recommended Tributary and system related alarms

Link performance with G.821 analysis

External Supervisory alarm status

Equipment temperature and input voltage

Diagnostic Features

Loop back facilities both at entire and fractional E1 level

Bypass facilities both at entire and fractional E1 level

Milli-Watt Tone (1KHz) Injection

Integrity of interface module in the equipment


Real time monitoring of network.

Execution of various Diagnostics &Tele commands

Configuration of Card Type & Parameters.

Configuration of Timeslots.

Status & Alarm history logging.

Viewing of logged data with specified query.

Performance monitoring of equipment and network.

Basic functions of WEBFIL

SUPERNET MANAGEMENT SYSTEM

The various information/command downloaded from the Network Management System (NMS)

Channel Cross-connect table

Interface Configuration table

Status Response command

Diagnostic command

Alarm History Upload command

Global Time-set command

The cross-connect table defines the configuration

of the multiplexer at a particular site.

It determines which of the 30 channels from the 2

MB bus to be dropped and which channels to be

passed through or which channels to be stopped.

The table also defines which are the channels to

be operated in conferencing mode.

The tables downloaded from the network manager

is stored in non-erasable Electrical Erasable Prom

(EEPROM).

Cross-connect table

Main

2M

Main

2M

Local

Main 2M

Main 2M

Local

Main 2M

Main 2M

Local

A

C

B A

C

B A B

Main 2M

Main 2M

Local

M ain 2M

Main 2M

Local

A

C

B A

C

B

onnCe

Cross-connect table Linear (point to point)

Conference Semi-Conference

Linear (point to point) Linear (point to point)

Six cross-connect tables are there to take care of the various conditions of the network.

Cross-connect table for normal operation

Alternate cross-connect table when A-tributary is

having major alarm. (Faulty – A)

Alternate cross-connect table when B-tributary is

having major alarm. (Faulty – B)

Modified cross-connect table when A-tributary

receives a remote alarm.(Remote – A)

Modified cross-connect table when B-tributary

receives a remote alarm.(Remote – B)

Digital Bypass.

Cross-Connect table

Normal configuration with monitoring and

master clock selection from End Terminal:

1 2 3

A D/I B A D/I B B ET A

A ET B

4 2 2

D/I A B D/I A B

3 3

D/I

A B D/I A B

1 1

A B ET ET A

4 4

A ET B ET A B

Clock (Internal)

NMS(Master &

internal)

Clock (Extracted)

Tributary ―A‖ master

NMS (Slave&

internal)

Clock (Extracted)

Tributary “A” master

NMS (Slave& internal)

Clock (Extracted)


NMS (Slave&

internal)

E1 Link

Normal configuration monitoring and master

clock selection from Drop/Insert Terminal:

2 1 3

AA DD//II BB

AA DD//II BB BB ETET AA AA ETET BB

4

ET ET D/I D/I A A B A B A B

Clock (Extracted)



Clock (Internal)

NMS (Master&

internal)

Clock (Extracted)

Tributary “B” master


Clock (Extracted)



E1 Link

Protected configuration of Flexi MUX Terminal with

monitoring and master clock selection from Any Terminal:

1 2 3 4

A D/I B A D/I B B ET A

A ET B

2 2

D/I A B D/I A B

3 3

D/I

A B D/I A B

1 1

A B ET ET A

4 4

A ET B ET A B

Clock (Internal)

NMS (Master&

internal)

Clock (Extracted)

Tributary ―A‖

master

Clock (Extracted)

Tributary ―A‖

master

Clock (Extracted)

Tributary ―A‖

master NMS (Slave& internal) NMS (Slave& internal) NMS (Slave&

internal)

Protected Network Configuration of Flexi MUX

Terminal with SDH systems

1

B ET A A D/I B

3

A D/I B

4

A ET B

SD

H

AD

M

SD

H

AD

M

SD

H

AD

M

SD

H

AD

M

E

1

Clock (Internal)

NMS (Master& internal) MUX set as Protected

E/T

Clock (Extracted)


Clock (Extracted)


NMS (Slave& internal) NMS (Slave&

internal)

Clock (Extracted)

Tributary ―A‖ master NMS (Slave& internal)

MUX set as Protected

E/T

E

1 E

1

E

1

P

1

P

2

STM # N Optical Link

2 P1 P2 P1 P

2 P

1

P

2

NM

S

Protected Network Configuration of Flexi MUX

Terminal with SDH systems

1

B ET A A D/I B

3

D/I A B

4

A ET B

SD

H

AD

M

SD

H

AD

M

SD

H

AD

M

SD

H

AD

M

E

1

STM # N Optical Link 2

Port # B)

NMS (Master& internal

MUX set as D/I Mode

enabling Port # B

Clock (Extracted)

Tributary ―A‖ master NMS (Slave&

internal)

Clock (Internal)


internal)

Clock (Extracted)


internal)

MUX set as D/I Mode

enabling Port # B

E

1 E

1

E

1

P

1

P

2 P1 P2

P1

P

2 P

1

P

2

NMS Clock (Extracted

from

E1

Link

E1

Branching

Link

NM

S

Typical Network Configuration of Flexi MUX Terminal

E1

Ring

E1 Branch

NM

S

Typical Network Configuration of Flexi MUX Terminal

Various alarm information in NIM card

Tributary alarms (both for Tributary A & B):

i) RXF (2 Mb loss) – major alarm

ii)

iii)

iv)

v)

vi)

LOS (loss of sync.) – major alarm

RMA (Remote multi-frame alarm) – minor

BER (Bit error rate) alarm – major alarm

RA (Remote alarm) – minor alarm

System related alarms:

i)CNFG (Configuration error)

NMS :- When NMS is connected to the network, this

LED blinks.

BYP :- When the MUX is bypassed by NMS

command, this LED glows.

LED

STATUS

RED

AIS (Alarm indication signal/all ones) – major alarm

RED

AMBER

RED

AMBER

RED

GREEN

AMBER

RED

VARIOUS ALARM INFORMATION IN TRIBUTARY MODULE

TAF: Tributary A failure – loss of 2 Mb signal from A side

TBF: Tributary B failure – loss of 2 Mb signal from B side

INT CLK: Equipment is running in Internal Clock mode

DIG BYP: NMS has activated the digital bypass command

LPBK A: The Tributary A loopback command is activated through

NMS

LPBK B: The Tributary B loopback command is activated through

NMS

Indication Diagnosis Remarks

PSUOK-green steady Input and output voltages are

OK

PSU ERR — yellow steady

Any of the output voltages

has under voltage.

Power supply card maybe

faulty.

Shutdown — red steady

Power supply is shutdown

due to input under voltage or

overvoltage or output over-

voltage.

Line over-voltage or

under- voltage condition

may have occurred.

Otherwise, any short

circuit on the o/p side.

ALARMS

Power Supply card

NIM & TRIBUTARY CARD Indications Diagnosis Remarks

Sys OK –

green steady

Sys OK -

green steady

Indicates that there is no

alarm in the link

A Port

RXF - red

steady

TAF — red

steady

2 Mb loss in A-port.

If the alarm RXF goes off on

loopback, it indicates a failure in

the transmission side.

If the cable connection is OK, then

problem may be with Tributary

card.

AIS - red

steady All ones in A-port. Transmission link failure.

LOS—red

steady

LOS indicates a frame or

multiframe loss.

If the alarm RXF goes off on

Loopback, it indicates a failure in

the transmission side. Otherwise

If

the cable connection is OK, the

problem may be with tributary card.

BER—red

steady

Steady glow of BER

alarm indicates bit error

of more than 1 error bit

in 1000 bits

Probable cause lies with link

performance. If link is OK, then

problem may be with Tributary card.

BER - red

blinking

Blinking BER indicates

bit error greater than

1X10-6 but less than

1X10-3

Probable cause lies with link

performance. If link is OK, then

problem may be with Tributary card.

RA - amber Remote Alarm. Far end problem.

RMA -

amber

steady

Remote Multiframe

Alarm indicates a MF

loss.

Far end multiframe loss. If RMA comes

with RA then adjacent station problem.

B Port

Same alarm,

indication and

diagnosis as A—Port

CNFG alarm blinks when there

Card parameter not

properly configured or

downloaded.

is mismatch between the types

CNYG — red blinking of cards actually plugged in our

MUX and configuration

programmed from NMS.

NIM & TRIBUTARY CARD

Indication Diagnosis Remarks

INT/EXT clock – amber

steady

INT/EXT clock LED glows when system runs with its own clock or external clock and remains off when it extracts from another.

DIG BYP – amber steady

DIG BYP LED glows when DIG BYP

command is executed from NMS.

LPBK A – amber steady

LPBK A glows steadily when local

loopback A command is executed from

NMS and blinks when remote loopback

A command is given.

LPBK B – steady

LPBK B glows steadily when local loopback B command is executed from NMS and blinks when remote loopback B command is given.

NIM & TRIBUTARY CARD

Connecting FLEXIMUX to your NMS (desktop/laptop)

Installation NMs software in your PC

Webfil Supernet management System To

The NMS Startup Screen appears

The Main Menu System :

Setup Equipment Monitor Control History

Help

Qui

t Yes

No Equipment

Local

Network

Single Equipment

All Equipment

Equipment Status

G821 Status

List

Activate/De-activate

Legend Setup

Cross connect Card

parameter

Show

Print

Change Password

User Account

Network Download Clock

Edit Network

Default Settings

Terminal

Global

Description of Menu & Functionality

Creating network in NMS

.

To

monit

Cli

Monitoring of network status la UIPMENT

pment

Maintenance &trouble shooting of network

1.First, select Equipment

Address from the Dropdown

List.

2.Click one of the Control

Command options

and follow on screen

message if any.

3.Click OK and Yes to

confirm.

From the popup screen :

1. Select equipment address :

Maintenance &trouble shooting of network VVIiewing Equipment History :

PUNCOM V-MUX - 0100

Chapter 2

Primary E1 Add/Drop Multiplexer VMX - 0100

PCM1

(2

Mbps)

30 TS

PCM2

(2

Mbps)

30 TS

40 ports

(only 30 usable)

Block diagram of Puncom VMUX - 0100

PUNCOM VMUX 0100

VMX-0100 is 2 Mbps, 30 Channel, highly flexible Add/

Drop Multiplexer with following features:

Provides 40 Voice/data ports.

Supports ISDN compatible U interface port. Supports Nx64 (V.35/G.703) Sync data with ‗N‘ max = 30

Provides 10 Three Party Plus 8 Four Party

Conferences.

VMX - 0100 Features

Provides a variety of fully programmable voice &

data ports.

Fully programmable Locally and Remotely through

NMS.

Synchronization to different user selectable Clock

Sources.

Line cards are slot Independent.

Compliant to all relevant ITU-T recommendations

VMX - 0100 Features

VMX-0100 shelf has 14 slots.

First 4 slots are called reserved slots and these slots

are used for placing power supply & control cards.

Remaining 10 slots (from slot no. 5 to 14) are called

universal slots & these universal slots are used for

placing the user interface cards.

Slot 1 Power Supply (PSU) Card #1

Slot 2 Power Supply (PSU) Card #2 Redundant

Slot 3 TME Card

Slot 4 Loop Protection (LPC) Card (Optional)

Slot 5-14 User Interface Cards (Line Cards)

VMX – 0100 Shelf Arrangement

Front View of VMX-0100

Rear view of VMX-0100

Rear View of VMX-0100

An 8-position DIP switch has been provided on the

motherboard to set the equipment ID.

With 8 positions maximum of 256 ( 28 ) IDs can be

set.

This ID is required for the NMS operation & forms

the address of the NMS basic frame.

E.g. ID of Mux = 101, the equivalent binary code is

(01100101), accordingly DIP switch position is

changed.

Equipment ID

PSU (Power Supply Unit)

Power Supply in the VMX-0100 is DC-DC converter

based on SMPS technology.

Redundant PSU placed in slot no.2

Also generates the 75V rms, 25Hz. ring signal

required for the FXS card.

The input output specifications are as under:

Input:

-36 V to -72V (-48V nominal)

Output:

+5V

+12V

-12V

PWR

O/P FAIL

OFF

ON

- 48V

- 48V

RET

+ 5V

GND

+ 12V

- 12V

PSU

ITEM DESCRIPTION

ON/OFF

SWITCH

Turns the power ON/OFF.

UP Position OFF,

Down Position ON. Power Green LED glows when –

48V input is present.

Output

Fail

LED

Red LED lights when any

of the output voltages i.e.

+5V, +12V or –12V fail.

Monitoring

points

Monitoring points for

input -48V, -48V return,

+5V, Ground, +12V & -

12V

PSU (Power Supply Unit)

HEALTH LED

P1 LOCAL ALARM LED

P2 LOCAL ALARM LED

P1 REMOTE ALARM LED P2

REMOTE ALARM LED CLOCK

ALARM LED

TEST MODE LED NMS POLL TX

LED NMS POLL RX LED

NMT RS-232 CONNECTOR

NMS RS-232 CONNECTOR

NMS ETHERNET CONNECTOR

HEALTH

P1 LCL P2 LCL P1

RMT P2 RMT

CLOCK TES

T

TD NMS

RD NMS

NMS

NMT

NMS

TME

TME (Two Megabit Ethernet) Card

Main controller card

2 Mb generation

Conference piggy on this

card

NVRAM (for storing

programming)

NMS / NMT interface

Clock generation

Item LED

Status LED Function

HEALTH Blinking (Green/Red)

ON Red

Card is working OK.

Card hardware has gone faulty.

P1 LCL ON

Fast Blinking

Fast Blinking

Fast Blinking

Slow Blinking

Slow Blinking

PCM1 Loss of Signal

PCM1 Frame Sync. Loss

PCM1 Multi-frame Sync. Loss

PCM1 CRC Frame Sync. Loss

PCM1 error rate > E103


P2 LCL ON

Fast Blinking

Fast Blinking

Fast Blinking

Slow Blinking

Slow Blinking

PCM2 Loss of Signal

PCM2 Frame Sync. Loss

PCM2 Multi-frame Sync. Loss

PCM2 CRC Frame Sync. Loss



LED indications on TME card

P1 RMT ON

Slow Blinking

Slow Blinking

Slow Blinking

PCM1 Receive AIS (All 1s)

PCM1 Receive Remote FSL

PCM1 Receive Remote MFSL

PCM1 Receive AIS in TS16

P2 RMT ON

Slow Blinking

Slow Blinking

Slow Blinking

PCM2 Receive AIS (All 1s)

PCM2 Receive Remote FSL

PCM2 Receive Remote MFSL

PCM2 Receive AIS in TS16

CLOCK Blinking

ON

Slips

Selected Clock Fail

TEST ON

Card in diagnostics or Loop back Mode

TD NMS Blinking NMS Polls Transmitted

RD NMS Blinking NMS Polls Received


NMS Ethernet

Connector

RJ-45 Connector for connection to NMS on LAN.

NMT

Connector

DB9 female, for

connection to NMT.

Connector pin allocation

is described in this

section later. This port

is configured as DCE.

NMT

Connector

NMS RS-232

Connector

DB9 female, for

connection to PC-Based

NMS, Connector Pin

allocation is described in

this section later. This

port is configured as

DCE.

NMS RS-232

Connector


Three cards for all VF Interfaces:

E&M 2W/4W

Exchange Interface (FXO)

Hot Line / Subscriber Interface (FXS)

All VF ports are programmable for gain setting and

interface selection.

Remote and Local loop backs for easy network

diagnosis.

Line cards (VF Interfaces)

Omnibus Voice Circuits are defined as the circuits

(in the network) where all the participants can

listen and talk simultaneously.

Although as a protocol/ for intelligible

communications only one person talks at a time.

Omnibus Voice Circuits are Implemented by

using conferencing facility in individual

multiplexers.

Omnibus Voice Circuit (Using E & M card )

MUX

3-Party Conferencing 4-Party Conferencing

MUX

+ +

MUX

MUX

+

Omnibus Circuits using PD MUX Conferencing

DTMF selective signaling is used to ring any

particular station or a group.

Remote stations can call the controller using voice

calling.

As the signal gets added at every station, local

cable noise is also added to the conference.

Poor cabling or very long-links can cause DTMF

signaling to fail, and render the circuit useless.

Omnibus circuits should be preferably setup on 4

wire basis as even small echo due to poor return

loss on 2 wire devices can cause DTMF signaling

to fail.

General Features of Omnibus Circuits

4 Wire E&M Trunk And FXO-FXS

Remote Subscriber Extension Applications

MUX MUX MUX

4W

E&M

4W

E&M

FXS E&M FXO E&M

Exchange A Exchange B

GDT card (G.703 Data card): This card provides 4 channels of G703

Data interface for 64 Kbps data

applications like PRS, UTS

DAC card (Data Acquisition card):

This Card has the features of

System voltages monitoring like PSU

voltage.

8 auxiliary dry contacts for controlling 8

tasks.

6 analogue inputs for monitoring the

environmental parameters like

temperature.

Other Interface Cards

Use of LPC and 2 E1s at every station

for all time-slots protection

Switching in LPC in case of failure of E1/ OFC cut

between terminal station and immediate next station

Switching in LPC in case of failure of E1/ OFC cut

between two intermediate stations

In case of multiple cable cuts in a single protected section,

the stations on either side of the isolated section (section

isolated by two cable faults) get directly connected.

Multiple Cuts Scenario:

Isolation and overreach problems

Configuration of PD MUX using NMS Software

Set laptop / PC‘s (in which NMS software is

installed) IP address as 10.X.Y.Z (where X,Y, Z can

be any number from 1 to 255), Subnet mask as

255.0.0.0 & no default gateway.

Mux IP address is 10.10.10.1 We can access Mux

locally through this IP on any internet browser.

Set MUX ID & add this ID on NMS

User name is ―web‖ & password is ―web‖ too

There are 4 routing tables to store programming. By

default Routing table no. 1 is active.

There are 5 types of clocks - PCM 1, PCM 2,

internal, external & data.

Network Layout

Configuring a Location

Configuring Alarms

Troubleshooting chart for Puncom’s Mux

Alarm Condition Possible Cause Action Suggested

PSU‘s ―PWR‖ LED

ON

& ―O/P FAIL‖ LED off

Normal condition of the card No action required.

PSU‘s ―PWR‖ LED off The power cable for the PSU on the

motherboard is not connected /

corresponding MCB on BTP is off.

Connect the power cable / switch on

the MCB / check the connections on

BTP.

PSU‘s ―O/P FAIL‖

LED

red

One or more of the PSU‘s output

has failed Replace the PSU.

TME‘s ―Health‖ LED

blinking Red-Green &

all other LEDs off

(except TDNMS

blinking)

Normal condition of the card No action required.

TME‘s ―Health‖

LED red

permanently

TME has gone faulty

Replace TME & program

accordingly.

P1 / P2 ―Local‖ LED

ON

Problem in STM See the Rx port of STM. If it‘s red, the

fibre has broken or cross connects not

configured in STM. Check STM / fibre.

Mux has hanged Reset the Mux by switching it OFF & then

ON & wait for few minutes. The alarm

should go. If it doesn‘t go to next step.

Wiring between Mux & STM (via DDF)

has become loose or has broken up.

Check wiring between Mux & STM.

Correct it, if found loose. Still problem

persists, change TME card.

P1 / P2 ―Remote‖ LED

glows

Problem at remote site i.e. next station

to which P1 / P2 (as the case may be)

is connected or fiber break.

Check other station for faults / rectify fibre

break.

P1 / P2 ―Local‖ LED

blinking

Errors at the local site Wiring may be loose between STM & Mux

P1 / P2 ―Remote‖ LED

blinking

Errors at the remote site Wiring may be loose between STM & Mux

on the other site to which P1/P2 is

connected.

Clock LED blinking /

permanently glowing

Blinking implies slips & permanently

glowing means clock has failed

Check clock settings through NMS.

Settings may be wrong or primary clock

has failed

Test LED glowing

Card in diagnostics or Loop back Mode

Remove the loopback 1

Troubleshooting

TDNMS LED blinking NMS is working No action required

LPC Health LED green LPC is working ok No action required

LPC

glows ―P

1

fail‖ LED P1 has broken & system is working on

protection if TME is normal

Correct the primary link connected to P1

as early as possible. (If TME is normal)

LPC

glows ―P

2

fail‖ LED P2 has broken & system is working on

protection if TME is normal

Correct the primary link connected to P2

as early as possible. (If TME is normal)

Health LED of any line

card like

E&M,FXO,FXS blinking

Card‘s hardware is OK but it is not

configured by main TME card

Configure the card through NMS


card like

E&M,FXO,FXS green

Card is working OK No action required


card like

E&M,FXO,FXS red

Card has gone faulty Replace the card

Test LED of any line

card like E&M,FXO,FXS green

The respective port is in loopback

mode

Remove the loopback through NMS for

normal working of the port

Troubleshooting

Thank you

tct-3 programmable digital drop-insert e1 multiplexers

Documents