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SHDSL Configuration GuideR8.2 and higher

Thomson Gateway


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Thomson GatewaySHDSL Configuration GuideR8.2 and higher


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Copyright

Copyright 1999-2006 Thomson. All rights reserved.

Distribution and copying of this document, use and communication of its contents is not permitted without written authorization

from Thomson. The content of this document is furnished for informational use only, may be subject to change without notice,and should not be construed as a commitment by Thomson. Thomson assumes no responsibility or liability for any errors orinaccuracies that may appear in this document.

Thomson Telecom BelgiumPrins Boudewijnlaan, 47B-2650 EdegemBelgium

http://www.thomson-broadband.com

Trademarks

The following trademarks are used in this document:

SpeedTouch is a trademark of Thomson.

DECT is a trademark of ETSI.

Bluetooth word mark and logos are owned by the Bluetooth SIG, Inc.

Ethernet is a trademark of Xerox Corporation.

Wi-Fi and the Wi-Fi logo are registered trademarks of the Wi-Fi Alliance. "Wi-Fi CERTIFIED", "Wi-Fi ZONE", "Wi-Fi Alli-ance", their respective logos and "Wi-Fi Protected Access" are trademarks of the Wi-Fi Alliance.

UPnP is a certification mark of the UPnP Implementers Corporation.

Microsoft, MS-DOS, Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corpo-ration in the United States and/or other countries.

Apple and Mac OS are registered trademarks of Apple Computer, Incorporated, registered in the United States andother countries.

UNIX is a registered trademark of UNIX System Laboratories, Incorporated.

Adobe, the Adobe logo, Acrobat and Acrobat Reader are trademarks or registered trademarks of Adobe Systems, Incor-porated, registered in the United States and/or other countries.

Other brands and product names may be trademarks or registered trademarks of their respective holders.

Document Information

Status: v2.0 (June 2008)Reference: E-DOC-CTC-20080313-0001Short Title: Config Guide: SHDSL R8.2 and higher
http://www.thomson-broadband.com/http://www.thomson-broadband.com/


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Contents

About this SHDSL Configuration Guide ................................... 1

1 Introduction.................................................................................. 3

2 SHDSL Overview ......................................................................... 5

2.1 Standard Compliancy ...................................................................................... 5

2.2 Transmission Convergence (TC) Layers .......................................................... 8

2.3 Capacity Characteristics ............................................................................... 10

3 Thomson SHDSL Devices ......................................................... 13

3.1 Portfolio Overview ........................................................................................ 13

3.2 Front Panel.................................................................................................... 14

3.3 Back Panel .................................................................................................... 15

3.4 LED Behaviour and Connector Layout .......................................................... 16

4 Configuring and Operating the SHDSL Interface ................... 19

4.1 Simple Back-to-Back Setup........................................................................... 20

4.2 SHDSL CLI 1-2-3 ............................................................................................ 25

4.3 CLI Reference ................................................................................................ 27

5 Modem Options .........................................................................35

5.1 Introduction .................................................................................................. 35

5.2 Modem-Option Reference ............................................................................. 36


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Contents


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About this SHDSL Configuration Guide

About this SHDSL Configuration Guide

Used Symbols

TerminologyGenerally, a Thomson Gateway of the SHDSL product portfolio will be referred to as a Thomson SHDSLdevice in this SHDSL Configuration Guide.

Typographical ConventionsFollowing typographical convention is used throughout this manual:

This sample text indicates a hyperlink to a Web site.

Example: For more information, visit us at www.thomson-broadband.com .

This sample text indicates an internal cross-reference.

Example: If you want to know more about guide, see 1 Introduction on page 7.

This sample text indicates an important content-related word.Example: To enter the network, you must authenticate yourself.

This sample text indicates a GUI element (commands on menus and buttons, dialog box elements, filenames, paths and folders).

Example: On the File menu, click Open to open a file.

Documentation and software updatesThomson continuously develops new solutions, but is also committed to improving its existing products.

For more information on Thomson's latest technological innovations, documents and software releases, visitus at http://www.thomson-broadband.com .

Disclaimer IP addressesAll Internet Protocol (IP) hosts that are part of examples in this document are assumed to be RFC1918Category 1 hosts. They require no access to hosts in other enterprises or the Internet at large.

As such, all IP addresses are assumed to be of type private and may not be used outside this private context.In addition, any use of actual IP addresses shown in documentation examples are inadvertent andconcomitant.

A note provides additional information about a topic.

A caution warns you about potential problems or specific precautions that need to be taken.
http://www.thomson-broadband.com/http://www.thomson-broadband.com/http://www.thomson-broadband.com/http://www.thomson-broadband.com/http://www.thomson-broadband.com/http://www.thomson-broadband.com/


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About this SHDSL Co nfiguration Guide


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1| Introduction

1 Introduction

IntroductionSHDSL is short for Symmetric High-speed Digital Subscriber Line and is one of the several DSL flavoursoffered by telecommunication providers. Its main difference with the more popular Asymmetric DigitalSubscriber Line (ADSL) variant is that it provides symmetrical data rates.

The intention of this SHDSL Configuration Guide is the following:

Highlight the most important features and capabilities of Thomsons SHDSL product portfolio.

Provide a legend for back panel and connector layout.

Explain the relevant SHDSL aspects in detail.

Familiarize the reader with Thomsons SHDSL CLI and network OS via a simple back-to-back setup.

For in-depth SHDSL information, the interested reader is encouraged to read the relevant SHDSL standards,which are publicly available on the ITU-T website: www.itu.int/ITU-T/ . See also section 2.1 StandardCompliancy on page 5 for more information.

Inevitably, in explaining the operation and configuration of the Thomson SHDSL devices, certain higher layeraspects (bridging, routing, QoS, VLANs and so on) will be touched. These will be explained if necessary, butfor specific details the appropriate documentation must be consulted.

SHDSL featuresAll Thomson SHDSL devices support following SHDSL-specific features:

Flexible and cost-effective SHDSL product portfolio: 1-pair, 2-pair, 3-pair and 4-pair flavours.

Symmetrical data rates ranging from 192 kbps up to 5696 kbps per wire-pair.

Single hardware platform supporting two Transmission Convergence (TC) layers:ATM over SHDSL: ATM cells mapped in SHDSL framing.

EFM over SHDSL: Ethernet frames mapped in SHDSL framing.

In case the TC-layer is set to ATM, support of the optional SHDSL-bonding feature, referred to as (ATM)M-pair operation. Both the 2-wire/4-wire mode as well as the scalable M-pair mode are supported.

In case the TC-layer is set to EFM, support of the optional Physical Medium Entity Aggregation Function(PAF).

Full standard compliancy: ITU-T G.991.2, ITU-T G.994.1 and IEEE 802.3-2005.

Capable of operating in either Customer Premises Equipement (CPE) mode or Central Office (CO) mode:

CPE mode (default): to connect to SHDSL DSLAM lines.

CO mode: to cover back-to-back applications (one device in CPE mode connected to a second devicein CO mode).

Per default interoperable with the most important DSLAM vendors.

Extended interoperability achieved via modem options.

Support of following auto-detection mechanisms:

Automatic synchronization to a specific rate or within a specified range (192 kbps - 5696 kbps).

Auto-detection of the TC-layer (ATM/EFM).

Single pair or M-pair operation via the auto-wire option in both ATM and EFM.

Automatic detection of the master-pair in case of ATM M-pair operation.


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1| Introduction

TerminologyThis paragraph briefly describes several DSL-related terms that are used throughout this ConfigurationGuide:

DSL line : this term refers to a copper wire-pair that can be connected to a DSL modem.DSL link : this term refers to a DSL circuit in the SHDSL chip. Each DSL link is terminated on the back-panel connector and can be connected to a single DSL line. A device with one DSL link is also referred toas a single pair device. Similarly, a device with two DSL links is referred to as a 2-pair device, and so on.

DSL interface : Thomson SHDSL devices implement a logical DSL interface. Multiple DSL links can beadded to a single DSL interface. This way, the DSL interface can be used to refer to a single link ormultiple aggregated links.

DSL profile : this term refers to a set of configuration parameters that are applied to a single DSL interface.It is assumed that the configuration parameters that are part of a DSL profile only change sporadically.

Internal channel : this term refers to an internal communication channel between the SHDSL chip and thenetwork processor (NWP). A DSL interface is associated with an internal channel, via which it exchangesdata traffic with the network processor. In practice, this internal channel is realized via a Utopia bus.

ATM M-pair operation : multiple SHDSL links are assigned to a single DSL interface and as such constitutean ATM M-pair group. Data-traffic originating from the NWP will be byte interleaved over the members ofthe M-pair group via the SHDSL bonding technique.

EFM M-pair operation : multiple SHDSL links are assigned to a single DSL interace and as such constitutean EFM Physical medium entity Aggregation Function (PAF) group. Similar as with ATM M-pair, data-traffic originating from the NWP will be segmented over the members of the PAF group via the EFM PAFfunction. From a high level perspective, the intention of an ATM M-pair group or an EFM-PAF group isachieving a higher bandwidth for a given loop length or obtaining a longer reach for a given bandwidth.For this reason, the terms EFM-PAF, EFM M-pair and PAF group will be used interchangeably in theremainder of this document.

OverviewThe remainder of this SHDSL Configuration Guide is organized as follows:

Chapter 2 provides a short overview of the SHDSL standards. It briefly explains the operation of the ATM andEFM TC-layers and gives tentative figures of SHDSLs link capacity.

The next chapter describes Thomsons SHDSL product portfolio and explains the LED behaviour on the frontpanel and the connectors on the back panel.

Chapter 4 explains the configuration and operation of the Thomson SHDSL interface in detail, using theCommand-Line Interface (CLI). The description of a simple back-to-back setup helps the SHDSL beginner toget started, while the more experienced reader can find specific information in an alphabetic list of SHDSLCLI commands.

Finally, the last chapter pays special attention to Thomsons SHDSL modem options. These options aremainly intended to achieve interoperability in cases where the COs SHDSL implementation deviates fromstandard.

This results in the following chapters:

Topic Page

2 SHDSL Overview 5

3 Thomson SHDSL Devices 13

4 Configuring and Operating the SHDSL Interface 19

5 Modem Options 35


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2| SHDSL Overview

2 SHDSL Overview

OverviewThis chapter covers following topics:

2.1 Standard Compliancy

IntroductionThomsons SHDSL implementation attempts to be as compliant as possible with the relevant standards inforce at the time of product release. The main reason for this goal is to achieve as much interoperability withas many as possible counterparts.

In particular, Thomson SHDSL devices are compliant with:

ITU-T G.991.2 and its annexes, which mainly specify:

The SHDSL specific framing, line-coding and possible data rates.

The ATM TC-layer.The 2-wire/4-wire operation.

The more recent and scalable ATM M-pair operation.

ITU-T G.994.1 , which specifies the handshake procedures for DSL transceivers.

IEEE 802.3-2005 Clauses 56, 61 and 63, which specify:

The EFM TC-layer.

The EFM M-pair operation.

Specific aspects of ITU-T G.994.1 (G.Hs), which are needed for SHDSL EFM operation.

Topic Page

2.1 Standard Compliancy 5

2.2 Transmission Convergence (TC) Layers 8

2.3 Capacity Characteristics 10


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2| SHDSL Overview

ITU-T G.991.2SHDSL is mainly standardized by ITU-T Recommendation G.991.2. This recommendation is often abbreviatedas G.SHDSL. The latest standardization activities resulted in Annex F and G, which allow for higher data ratesand are referred to as G.SHDSL bis. This recommendation also specifies the optional 2-wire/4-wire operationand the more scalable M-pair mode, which are referred to as SHDSL bonding or simply G.Bond.

Following table provides an overview of the sections of ITU-T G.991.2 that are relevant to the ThomsonSHDSL devices:

ITU-T G.994.1SHDSL is a complex link layer and to use it in a flexible way, some form of auto-negotiation is needed. Forthis function, SHDSL transceivers rely on ITU-T Recommendation G.994.1, often abbreviated as G.Hs. Thisrecommendation specifies the mechanism and procedures that DSL transceivers must use to exchange theirindividual capabilities and to select a common mode of operation. The recommendation is an integral part ofthe start-up procedure for ITU-T G.991.2.

The Thomson SHDSL devices are compliant with following standard:

Standard Title Popular term

ITU-T G.991.2 (12/2003) Single-pair high-speed digital subscriber line (SHDSL)transceivers

Annex A Regional requirements - Region 1 (North America) G.SHDSL

Annex B Regional requirements - Region 2 (Europe)

Annex E.9 TPS-TC for ATM transportAnnex F Region 1 requirements for payload data rates up to

5696 kbpsG.SHDSL bis

Clause 8.2 Data interleaving in M-pair mode G.Bond

ITU-T G.991.2 Am. 1 (07/2004) Single-pair high-speed digital subscriber line (SHDSL)transceivers Amendment 1

ITU-T G.991.2 Am. 2 (02/2005) Single-pair high-speed digital subscriber line (SHDSL)transceivers Amendment 2

Annex G Region 2 requirements for payload data rates up to5696 kbps

G.SHDSL bis

Standard Title Popular term

ITU-T G.994.1 (02/2007) Handshake procedures for digital subscriber line(DSL) transceivers

G.Hs


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2| SHDSL Overview

IEEE 802.3-2005IEEE 802.3-2005 Clause 56 introduces Ethernet in the First Mile (EFM). Several physical layers are specified foroptical fiber media, voice grade copper pairs and passive optical networks (PONs). It also introduces anOperations, Administration and Maintenance (OAM) mechanism to be used on point-to-point Ethernet links(E-OAM). Clause 61 specifies items common to the 10PASS-TS and 2BASE-TL EFM systems which apply tovoice grade copper media. This clause also specifies the optional PAF function. Clause 63 is 2BASE-TLspecific, which is the EFM system used in combination with SHDSL modulation.

Following IEEE 802.3-2005 clauses are relevant to the Thomson SHDSL devices:

Standard Title

IEEE 802.3-2005 (12/2005) Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD)access method and physical layer specifications

Clause 56 Introduction to Ethernet for subscriber access networks (Ethernet in the FirstMile)

Clause 61 Physical Coding Sublayer (PCS), Transmission Convergence (TC) sublayer,and common specifications, type 10PASS-TS and type 2BASE-TL

Clause 63 Physical Medium Attachment (PMA) and Physical Medium Dependent(PMD), type 2BASE-TL


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2| SHDSL Overview

2.2 Transmission Convergence (TC) Layers

IntroductionThomson SHDSL devices support two Transmission Convergence (TC) layers: the traditional AsynchronousTransfer Mode (ATM) TC and the newer Ethernet in the First Mile (EFM) TC.

A single platform such as the SHNT-F is capable of operating in any of the following configurations:

ATM TC on top of a single SHDSL link.

ATM TC on top of multiple SHDSL links configured in a single SHDSL 4-wire group or a scalable SHDSLM-pair group.

EFM TC on top of a single SHDSL link.

EFM TC configured in a PAF group consisting of at least one and possibly multiple SHDSL links.

The remainder of this section briefly explains each combination and enumerates the main advantages anddisadvantages.

ATM TC - Single pairIn case the ATM TC-layer is enabled on a single SHDSL link, a stream of 53 byte ATM cells is converted into anoctet stream which is fed into the SHDSL transceiver.

Advantages:

ATM is a well proven technology.

This solution is multiprotocol, e.g. PPPoE over ATM, PPP over ATM (PPPoA) or Ethernet over ATM(ETHoA).

Disadvantages:

Fixed 5 byte cell overhead + variable AAL5/fixed RFC 1483 overhead.

ATM TC - M-pairIf multiple SHDSL links are assigned to a DSL interface, then it can operate in 4-wire mode or in the scalableM-pair mode. In this case, the cell stream is byte-interleaved over the two pairs (4-wire mode) or over the Mpairs (M-pair mode). This aggregation method is sometimes referred to as SHDSL bonding. This techniquerequires that the SHDSL links within the bonding group are all in data mode and synchronized to the samerate.

Advantages:

Deployed and proven track record.

No extra overhead due to M-pair operation.Disadvantages:

The links must synchronize to the same rate.

All links must be simultaneously up.


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2| SHDSL Overview

EFM TC - Single pairIn case the EFM TC-layer is enabled on a single SHDSL link, a stream of variable-sized Ethernet frames is firstconverted into 64 byte EFM fragments. Next, these fragments are 64/65-octet encoded and fed into theSHDSL transceiver. This mechanism is also referred to as basic EFM framing.

Advantages:

Very low encapsulation overhead.

Disadvantages:

This solution is single protocol, i.e. Ethernet only (including PPPoE).

EFM TC - M-pairIf multiple SHDSL links are assigned to a DSL interface, a so-called PAF group is formed. Prior to applyingbasic EFM framing, Ethernet frames are segmented in PAF segments. The individual PAF segments areforwarded to any of the available SHDSL links within the PAF group. Each SHDSL link performs the further

EFM processing similar as for basic EFM framing.Advantages:

For data transport it is sufficient that a single link is in showtime.

Links that are part of a PAF group may synchronize to different rates, which may differ to a ratio of four.

Disadvantages:

Slightly higher overhead if compared to basic EFM framing

Utopia data busIn order to support the two TC-layers (ATM and EFM) on a single hardware platform, the Utopia bus isselected as data bus for the communication between the SHDSL chip and the NWP. This Utopia bus enablesthe customer to seamlessly switch between the two TC-layers.

The Utopia data bus is an ATM bus, implying that in case of EFM mode an ATM layer is still used internally.The SHDSL chip terminates the ATM layer and expects to receive the data traffic on a PVC with address 0.32(VPI.VCI). For more information, see Internal operation on page 26 .


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2| SHDSL Overview

2.3 Capacity Characteristics

IntroductionThis section gives an idea of the maximum link capacity of a Thomson SHDSL device in case the TC-layer isset to EFM.

Two cases should be considered:

EFM TC - Single pair

EFM TC - M-pair

G.SHDSL offers symmetrical data rates from 192 kbps up to 2312 kbps in 64 kbps increments. If G.SHDSL bisis used, symmetrical data rates from 768 kbps up to 5696 kbps can be achieved, again in 64 kbps increments.These values apply to a single DSL link. If multiple DSL links are used, the aggregated bandwidth can be up to22.8 Mbps (four DSL links). However, the overhead due to EFM framing or the EFM M-pair operation mustalso be taken into account.

EFM TC - Single pairFollowing table shows the maximum link capacity of a single DSL link for different (untagged) Ethernet framesizes. We assume that the DSL link has a fixed bandwidth of 5696 kbps.

EFM TC - M-pairFollowing table shows the maximum link capacity of a PAF group with two DSL links for different (untagged)Ethernet frame sizes and different PAF fragment sizes. We assume that the PAF group contains two DSL links,each with a fixed bandwidth of 5696 kbps. This results in an aggregated bandwidth of 11 392 kbps.

Ethernet frame size (bytes) Maximum link capacity (fps) Encapsulation efficiency (%)

64 10 028 90

128 5 235 94

256 2 676 96

512 1 353 97

1024 680 98

1518 459 98

Disclaimer : the values in this table are for information purposes only. Actual results may vary,depending on many factors (e.g. noise environment, distance to DSLAM, DSLAM configuration andothers).

Ethernet framesize (bytes)

Maximum link capacity (fps)

PFS = 64 PFS = 128 PFS = 256 PFS = 512

64 19 243 19 243 19 243 19 243

128 9 687 10 245 10 245 10 245

256 4 860 5 141 5 294 5 294

512 2 434 2 575 2 652 2 692


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2| SHDSL Overview

1024 1 217 1 289 1 327 1 347

1518 824 868 895 909

PFS is short for PAF Fragment Size (octets). By default, the PFS is set to 256 octets.

Disclaimer : the values in this table are for information purposes only. Actual results may vary,depending on many factors (e.g. noise environment, distance to DSLAM, DSLAM configuration andothers).

Ethernet framesize (bytes)

Maximum link capacity (fps)

PFS = 64 PFS = 128 PFS = 256 PFS = 512


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3| Thomson SHDSL Devices

3 Thomson SHDSL Devices


3.1 Portfolio Overview

SHDSL product portfolioThis document is applicable to following Thomson SHDSL devices:

TG605s

ST620s

TG628s

Product capabilities and limitsFollowing table lists the capabilities and the upper limits for the different SHDSL devices:

Topic Page

3.1 Portfolio Overview 13

3.2 Front Panel 14

3.3 Back Panel 15

3.4 LED Behaviour and Connector Layout 16

Capabilities TG605s(1-pair)

TG605s(2-pair)

ST620s TG628s

Board Mnemonic (name) SHNT-G SHNT-G SHNT-D SHNT-F

Product ID (PID) 1 0 0 0

Maximum number of DSL links 1 2 2 4

Maximum number of DSL interfaces 1 1 1 1

Maximum number of DSL profiles 2 4 4 4

For more information on the terminology used in this table, see Terminology on page 4 .


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3| Thomson SHDSL D evices

3.2 Front Panel

LayoutThe following illustration shows the front panel of a Thomson SHDSL device (TG628s):

LEDsThe Thomson SHDSL device is equipped with a number of LEDs on its front panel, indicating the state of thedevice during normal operation.

The following table shows the meaning of the different LEDs of a TG628s, which supports four DSL links andhas a LED per DSL link:

E t h e r n e t

P o w e r 3 4

D S L - 1 2

I n t e r n e t

Indicator name Description

Power Power switched on or off, bootloader activity and device malfunctions

Ethernet Presence of an Ethernet connection and Ethernet activity

DSL-4 DSL activity on DSL link 3




Internet Presence of an Internet connection and Internet activity


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3.3 Back Panel

LayoutFollowing illustration shows the back panel of the Thomson Gateway:

Buttons and connectorsThe Thomson Gateway is equipped with the following buttons and connectors on its back panel.

Listed from left to right:

Power socket

On/Off switch

Serial interface

Reset button (to reset the device to the manufacturing defaults)

Four Ethernet connectors

DSL connectors (for example two in case of a TG628s)

Reset

ON

OFF2 3 41Console22V DC DSL-0 DSL-1


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3.4 LED Behaviour and Connector Layout

DSL LED behaviourThe behaviour of the DSL LEDs indicates the different phases in the DSL start-up process:

DSL connectorThe pins of the DSL connector are numbered from left to right as shown in following illustration:

Two types of DSL connectors are used:

RJ11 : this connector uses only one pair of pins (pins 3&4) in a 6-pin jack. RJ11 supports a single DSL line.

RJ14 : this connector uses two pairs of pins (pins 3&4 and pins 2&5) in a 6-pin jack. RJ14 supports twoDSL lines.

Signal-to-pin assignmentThe signal-to-pin assignment is as follows:

TG605s (1-pair variant):

Step DSL link status LED state

1 Silent Off

2 Sending G.Hs tones Green - Blinking at 2 Hz

3 G.Hs message exchange Green - Blinking at 4 Hz

4 Line training and initializing Green - Blinking at 4 Hz

5 Data mode achieved (showtime) Green - Solid

1 2 3 4 5 6

Connector nameon back panel

Link ID [0..3] RJ11 Pin [1..6] Signal (Tip/Ring)

DSL-0 0 3 Ring

4 Tip


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TG605s (2-pair variant):

ST620s:

TG628s:



DSL-0 0 3 Ring

4 Tip

3 2 Tip

5 Ring



DSL-0 0 3 Ring

4 Tip

3 2 Tip

5 Ring



DSL-0 0 3 Ring

4 Tip

3 2 Tip

5 Ring

DSL-1 1 2 Tip

5 Ring

2 3 Ring

4 Tip

The layout of connector DSL-1 requires special attention:Link ID 1 corresponds to pins 2 and 5.

Link ID 2 corresponds to pins 3 and 4.


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4| Configuring and Operating the SHDSL Interface

4 Configuring and Operating the SHDSL Interface

IntroductionThe purpose of this chapter is to explain the configuration and operation of the Thomson SHDSL interface indetail, via the CLI commands located in the xdsl CLI sub-tree:

The simple back-to-back setup illustrates the CPE and CO mode of SHDSL devices.

The CLI 1-2-3 explains how to establish an SHDSL connection with minimal configuration efforts.

The more experienced reader is provided with the fine details in the CLI reference.

DSL interface and DSL profileThomson introduces the concept of an SHDSL interface to allow the configuration of the SHDSL chip for

different use cases and to allow specific decisions during connection establishment. This way, advantage istaken of the flexibility of the SHDSL chip.

A DSL interface configuration is split in two parts for reasons of convenience:

A first part that is accessed via dedicated CLI interface commands and that may require a change duringdevice installation.

A second part that is assumed to change only sporadically and that is therefore embedded in a so-calledDSL profile.


Topic Page

4.1 Simple Back-to-Back Setup 20

4.2 SHDSL CLI 1-2-3 25

4.3 CLI Reference 27


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4| Configuring and O perating the SHDSL Inter face

4.1 Simple Back-to-Back Setup

IntroductionThis section describes a simple SHDSL back-to-back setup. A first SHDSL device is operated in CPE mode andis connected to a second one in CO mode. Both SHDSL devices are configured for transparent bridging.

Back-to-back setupTo create the setup, connect two PCs and two Thomson SHDSL devices as shown in following illustration:

AssumptionsThe remainder of this section is based on the following assumptions:

PC1 is configured with IP address 10.0.0.1 and netmask 24.

PC2 is configured with IP address 10.0.0.254 and netmask 24.

The configuration of the SHDSL devices will be done by executing CLI commands over a serial

connection.

Before you startBefore you start, prepare the SHDSL devices as follows:

Reset the Thomson Gateway to the factory defaults and reboot the device:

Set the timeout of the CLI session to a suitable value, e.g. 15 minutes (900 seconds):

COCPEDSL line(s)

PC2PC1Ethernet Ethernet

10.0.0.1/24 10.0.0.254/2410.0.0.10/24 10.0.0.20/24

{Administrator}=>:system reset factory=yes proceed=yes

{Administrator}=>:env set var=SESSIONTIMEOUT value=900


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Remove the factory default interfaces and settings that you do not need for the configuration:

Disable the broadcast filter on the bridge. This way, broadcasts (e.g. ARP requests) that arrive on a WANinterface are correctly received by the SHDSL device (and not dropped):

Make these changes permanent. This will be the starting point for our configuration:

Configure the COConfigure a Thomson SHDSL device in CO mode as follows:

Configure the prompt to easily identify the device that is being configured:

To configure SHDSL, execute following CLI commands:

Configure the IP address as follows:

Save the configuration:

{Administrator}=>:ip ifdelete intf=dmz1{Administrator}=>:ip ifdelete intf=guest1

{Administrator}=>:ip ifdelete intf=wan1{Administrator}=>:ip ipdelete addr=10.0.0.138{Administrator}=>:ip ipdelete addr=192.168.1.254

{Administrator}=>:eth flush{Administrator}=>:eth vlan flush{Administrator}=>:eth bridge ifdelete intf=Internet_8_35{Administrator}=>:eth bridge ifdelete intf=Internet_0_35

{Administrator}=>:atm ifdelete intf=atm_8_35{Administrator}=>:atm ifdelete intf=atm_0_35{Administrator}=>:atm phonebook delete name atm_pvc_8_35{Administrator}=>:atm phonebook delete name=atm_pvc_0_35

{Administrator}=>:eth bridge config filter=none

{Administrator}=>:saveall

{Administrator}=>:env set var=PS1 value="%env(Usr_Prompt)%groupx[]=>"=>:env set var=Usr_Prompt value={TG628s-CO}

{TG628s-CO}=>:xdsl ifdetach name=dsl0{TG628s-CO}=>:xdsl ifdelete name=dsl0{TG628s-CO}=>:xdsl ifadd name=dsl0 profile=def-co{TG628s-CO}=>:xdsl add name=dsl0 wirepair=link0{TG628s-CO}=>:xdsl add name=dsl0 wirepair=link1{TG628s-CO}=>:xdsl add name=dsl0 wirepair=link2{TG628s-CO}=>:xdsl add name=dsl0 wirepair=link3{TG628s-CO}=>:xdsl ifattach name=dsl0

{TG628s-CO}=>:ip ipadd intf=lan1 addr=10.0.0.20 netmask=24 addroute=enabled

{TG628s-CO}=>:saveall


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Configure the CPEConfigure a Thomson SHDSL device in CPE mode as follows:

Configure the prompt to easily identify the device that is being configured:

Configure the IP address as follows:

Save the configuration:

{Administrator}=>:env set var=PS1 value="%env(Usr_Prompt)%groupx[]=>"=>:env set var=Usr_Prompt value={TG628s-CPE}

{TG628s-CPE}=>:ip ipadd intf=lan1 addr=10.0.0.10 netmask=24 addroute=enabled

{TG628s-CPE}=>:saveall

By default, a Thomson SHDSL device is configured in CPE mode. No extra configuration of SHDSLis required.


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ResultWhen the configuration of the devices is finished, following results can be expected:

The DSL LEDs should behave like described in section DSL LED behaviour on page 16 (off - 2 Hz - 4 Hz

- solid green).Once the SHDSL links achieve showtime, information on the DSL interfaces can be displayed as follows:

{TG628s-CPE}=>:xdsl iflist name=dsl0

DSL-interface: dsl0--------------

State:------Modemstate : UpxDSL Type : SHDSLxDSL Standard & Annex : ITU-T G.991.2 - Annex: B&G - TPS-TC: EFMxDSl Line code : 32-TCPAMPME Aggregation Function (PAF): Enabled - Activated

Aggr BW (Down/Up - kbit/s) : 22784/22784Eth Frames TX/RX : 1/0Number of resets : 1Uptime (Days hh:mm:ss) : 0 Days 00:02:03

Configuration:--------------Profile : def-cpeUl-mode : autoWire-mode : autoInt-channel : dsl0Interface State : attachedLink Info : 0 1 2 3

Line Info:

----------Link ID : Link0 Link1 Link2 Link3Line State : Showtime Showtime Showtime ShowtimeBandwidth(Down/Up - kbit/s) : 5696/5696 5696/5696 5696/5696 5696/5696Margin Downstream (dB) : 19 19 19 19Attenuation Downstream (dB) : 1 0 1 0Power Backoff Upstream (dB) : 6 6 6 6Tx Power Upstream (dBm) : 8 8 8 8Tip/Ring Reversal : No No No NoErrored Seconds : 0 0 0 0Severe Errored Seconds : 0 0 0 0Loss Of Sync Word Seconds : 0 0 0 0Unavailable Seconds : 0 0 0 0

{TG628s-CPE}=>


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4.2 SHDSL CLI 1-2-3

IntroductionIn order to get a Thomson SHDSL device up and running with minimal configuration effort, the ThomsonGateway is provided with a default SHDSL configuration, configuring the device in CPE mode. The maincharacteristics of this default configuration are:

The DSL interface uses the default CPE profile.

All DSL links are added to the DSL interface.

The default TC-layer is EFM.

This section describes how you can quickly modify the default SHDSL configuration.

Basic configuration stepsIf you want to quickly modify the default configuration of SHDSL on your Thomson Gateway, executefollowing steps:

1 Delete the existing DSL interface.

2 Create a DSL profile. This step is optional, you can also use one of the two default profiles.

3 Create a new DSL interface.

4 Associate DSL links with the newly created DSL interface.

5 Configure the DSL interface. This step is optional, you can also use the default configuration.

6 Activate the DSL interface.

CLI commandsExecute the basic configuration steps to quickly configure a Thomson SHDSL device in CPE mode orCO mode:

1 Delete the existing DSL interface:

2 Decide which one of the two default DSL profiles you want to use:def-co : a profile that can be used to configure a device in CO mode.

def-cpe : a profile that can be used to configure a device in CPE mode.

3 Create a new DSL interface and specify the selected DSL profile:

4 Associate all DSL links with the new DSL interface.

For more detailed configuration information, see 4.3 CLI Reference on page 27 .

=>:xdsl ifdetach name=dsl0 (optional)=>:xdsl ifdelete name=dsl0

=>:xdsl ifadd name=dsl_new profile=def-co

=>:xdsl add name=dsl_new wirepair=link0=>:xdsl add name=dsl_new wirepair=link1=>:xdsl add name=dsl_new wirepair=link2

=>:xdsl add name=dsl_new wirepair=link3


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5 Use the default configuration of the DSL interface.

6 Activate the DSL interface.

Internal operationThe Utopia data bus, which is an ATM bus, is used for communication between the SHDSL chip and the NWP.For correct internal operation in case of EMF TC, an ATM interface with destination PVC 0.32 is required. Thisinterface is present by default and should not be removed from the configuration. However, if these itemshave been removed, they can be created as follows:

Create a phone-book entry for a PVC with VPI.VCI value 0.32:

Create an ATM interface on top of the phonebook entry:

Create an Ethernet bridge port connected to the ATM interface:

=>:xdsl ifattach name=dsl_new

=>:atm phonebook add name=atm_pvc_0_32 addr=0.32

=>:atm ifadd intf=atm_0_32=>:atm ifconfig intf=atm_0_32 dest=atm_pvc_0_32 ulp=mac=>:atm ifattach intf=atm_0_32

=>:eth bridge ifadd intf=eth-br-dsl=>:eth bridge ifconfig brname=bridge intf=eth-br-dsl dest=atm_0_32=>:eth bridge ifattach intf=eth-br-dsl


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4.3 CLI Reference

OverviewThis section describes following SHDSL-related CLI commands:

:xdsl add on page 27

:xdsl delete on page 27

:xdsl ifadd on page 28

:xdsl ifattach on page 28

:xdsl ifconfig on page 28

:xdsl ifdelete on page 29

:xdsl ifdetach on page 29

:xdsl iflist on page 29

:xdsl list on page 31

:xdsl profile add on page 32

:xdsl profile delete on page 32

:xdsl profile list on page 32

:xdsl profile modify on page 33

:xdsl addTo assign a DSL link to a DSL interface, execute the command :xdsl add .Following two parameters must be specified:

name : the name of the DSL interface, which must be readily available and in detached state.

wirepair : the name of a DSL link that is available.

For example, add the DSL links with link ID 0 and link ID 3 to a DSL interface:

:xdsl deleteTo remove a DSL link from a DSL interface, execute the command :xdsl delete .Following two parameters must be specified:

name : the name of the DSL interface, which must be in detached state.

wirepair : the name of the DSL link.

For example, remove the DSL link with link ID 0 from a DSL interface:

=>:xdsl add name=dsl0 wirepair=link0=>:xdsl add name=dsl0 wirepair=link3

The maximum number of DSL links is limited. For more information, see Product capabilities andlimits on page 13 .

=>:xdsl delete name=dsl0 wirepair=link0


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:xdsl ifaddTo create a new DSL interface, execute the command :xdsl ifadd .Following two parameters must be specified:

name : the name of the new DSL interface.

profile : the name of a DSL profile that was created in advance.

For example, create a new DSL interface:

As soon as the new DSL interface is created, i.e. the interface name and profile name are specified, theconfiguration parameters are set to default values, which depend on the profile type of the DSL interface. Formore information on the default configuration, see :xdsl iflist on page 29 .

:xdsl ifattachTo activate a DSL interface, execute the command :xdsl ifattach . Immediately after activating a DSLinterface, the G.Hs exchange starts.

The following parameter must be specified:

name : the name of the DSL interface to be activated.

For example, activate a DSL interface as follows:

:xdsl ifconfigTo configure a DSL interface, execute the command : xdsl ifconfig . Prior to configuring a DSL interface,it must be set to detach mode.

The following parameter must be specified:

name : the name of the DSL interface to be configured.

Optionally, following parameters can be specified:

ul-mode : the Transmission Convergence (TC) layer. Two values are possible:

atm : Asynchronous Transfer Mode. This is the default value.

efm : Ethernet in the First Mile.

wire-mode : the DSL wire configuration of the device. The possible values depend on the profile type ofthe DSL interface:

If the profile type is CPE , the parameter can be set to 1pair, ..., mpair and auto.

The default value is auto.

If the profile type is CO , the parameter can be set to 1pair, ..., mpair.

The default value is mpair.

=>:xdsl ifadd name=dsl0 profile=test-co

The maximum number of DSL interfaces is limited. For more information, see Productcapabilities and limits on page 13 .

=>:xdsl ifattach name=dsl0

In case of previous releases, a device reboot may be necessary to successfully change theTC-layer from ATM to EFM (or vice versa).


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int-channel : this parameter indicates the internal communication channel used by the DSL interface.

none : if this parameter is set to none, the DSL link(s) can still be initialized but not the ATM channel.This value is mainly intended for testing purposes only.

dsl0

For example, configure a DSL interface as follows:

:xdsl ifdeleteTo delete a DSL interface, execute the command :xdsl ifdelete and specify following parameter:

name : the name of the DSL interface to be deleted.

For example, delete a DSL interface as follows:

:xdsl ifdetachOne may detach a DSL interface to:

Restart the SHDSL link activation procedure.

Modify the configuration of the DSL interface.

Add or delete DSL links to the DSL interface.

To de-activate a DSL interface, execute the command :xdsl ifdetach and specify following parameter:name : the name of the DSL interface to be de-activated.

For example, de-activate a DSL interface as follows:

:xdsl iflistThis command shows various information on a DSL interface:

State section : this section is displayed if the interface is attached, irrespective its operational state (up/ down).

Configuration section : this section is displayed irrespective the administrative mode (attached/detached)and operational state (up/down) of the interface.

Line section : this section is displayed if the interface is up.

=>:xdsl ifconfig name=dsl0 ul-mode=atm wire-mode=2pair int-channel=dsl0

The assigned profile can not be changed with this command. If you want to change the assignedprofile, delete the interface and create a new one with the correct profile.

=>:xdsl ifdelete name=dsl0

=>:xdsl ifdetach name=dsl0


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To display summarized information (only the state sections) on all DSL interfaces, execute the command:xdsl iflist .

If the TC-layer is set to ATM, following information is displayed:

If the TC-layer is set to EFM, the state section contains an additional PME Aggregation Function (PAF) field. This field contains two subfields:

Configuration field : two values are possible:

Enabled: this value reflects an auto or M-pair wire-mode.

Disabled: this value reflects the single pair wire-mode.

Operational field : this field is only relevant if the interface is up. Two values are possible:

Activated: this means that PAF is activated when the link is established.

De-activated: this means that PAF is de-activated when the link is established.

If the TC-layer is set to EFM, following information is displayed:

=>:xdsl iflist


State:------Modemstate : UpxDSL Type : SHDSLxDSL Standard & Annex : ITU-T G.991.2 - Annex: B&G - TPS-TC: ATM xDSl Line code : 32-TCPAMAggr BW (Down/Up - kbit/s) : 22784/22784ATM Cells TX/RX : 0/153Number of resets : 1Uptime (Days hh:mm:ss) : 0 Days 03:50:15

=>

=>:xdsl iflist


State:------Modemstate : UpxDSL Type : SHDSLxDSL Standard & Annex : ITU-T G.991.2 - Annex: B&G - TPS-TC: EFM xDSl Line code : 32-TCPAMPME Aggregation Function (PAF) : Enabled - Activated Aggr BW (Down/Up - kbit/s) : 11392/11392Eth Frames TX/RX : 0/0Number of resets : 1Uptime (Days hh:mm:ss) : 0 Days 00:01:12

=>


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For example, display information on the default DSL profiles as follows:

:xdsl profile modifyTo modify the configuration of a DSL profile, execute the command :xdsl profile modify .Following parameter must be specified:

name : the name of the DSL profile to be modified.

The optional parameters are conditional, i.e. they depend on the profile type:

For both CO and CPE:

paffragmentsize : this parameter is only relevant if EFM will be used as TC-layer mode and a PAFgroup is configured. The parameter determines the size in bytes of an Ethernet segment. This is avalue within the range from 64 through 512. The value must also be a multiple of four.

CPE specific parameters: these parameters are referred to as the physical layer options or modemoptions. For more information on these parameters, see 5 Modem Options on page 35 .

atmupfast

automaster

fastdrop

force-enhancedforce-shdsl

=>:xdsl profile list name=def-cpe

Profile: def-cpe----------------

Profile Type : CPEPAF Fragment Size (octets) : 256

Physical Layer Options (Modem-Options)ATM Up Fast : disabledAuto Master : disabledFast Drop : disabledForce Enhanced : disabledForce SHDSL : disabledForce TCPAM16 : disabledForce TCPAM32 : disabledLine Probing : enabledSimulate Line Probing : disabled

Vendor Specific Octets : 0000

DISCLAIMER: The xDSL Physical Layer Options are intended for qualified personnel only.

=>:xdsl profile list name=def-co

Profile: def-co---------------

Profile Type : COPAF Fragment Size (octets) : 256xDSL Annex : ITU-T G.991.2 Annex B&GMin. Bandwidth (kbit/s) : 192Max. Bandwidth (kbit/s) : 5696Linecode : AutoMargins Current (dB) : 0

Margins Current Status : EnabledMargins Worst (dB) : 0Margins Worst Status : DisabledMonitoring : Disabled

=>


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force-tcpam16

force-tcpam32

lineprobing

simulate-lpvendor-specific

The profile type is CO:

annex : this parameter indicates which regional requirements are taken into account:

af: the regional requirements of ITU-T G.991.2 Annex A&F (North America) are used.

bg: the regional requirements of ITU-T G.991.2 Annex B&G (Europe) are used.

minbw : this is the minimum bandwidth at which the DSL modem should initialize.

maxbw : this is the maximum bandwidth at which the DSL modem should initialize.

linecode : this parameter indicates the line coding used for data transfer:

16-tcpam

32-tcpamauto

margincurrent : the current noise margin value, expressed in dB.

The noise margin indicates the amount that the noise may increase (and as a consequence the SNRmay decrease), but at which the modem must remain synchronized.

marginworst : the worst noise margin value, expressed in dB.

margincurrentenable : this parameter is used to enable or disable the use of the current noise marginvalue.

marginworstenable : this parameter is used to enable or disable the use of the worst noise marginvalue.

monitoring : this parameter is used to enable or disable Transmission Quality (SNR) monitoring.

The profile type can not be changed with this command. If you want to change the profile type,delete the profile and create a new one with the correct profile type.

The configuration of a DSL profile can not be modified if it is used by an attached DSL interface. Inthis case, the DSL interface must be detached first.


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5| Modem Options

5 Modem Options

5.1 IntroductionThe modem options, also referred to as the physical layer options, are part of a DSL profile of type CPE.These modem options are used during the SHDSL handshake procedure, when the CPE establishes aconnection with the CO.

D

Disclaimer : the modem options are intended for qualified personnel only. Always get in touch withThomson if you want to modify the default modem option settings.


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5| Modem Options

5.2 Modem-Option Reference

Following modem options exist on Thomsons SHDSL devices:

atmupfast : this modem option indicates when the ATM Transmission Convergence (TC) layer is enabled.

If disabled , the ATM TC layer is enabled when the DSL link status achieves data mode.

If enabled , the ATM TC layer is already enabled at the beginning of the SHDSL training. This can benecessary if the DSLAM requires that the ATM TC layer is synchronized within a few seconds.

By default, this option is disabled.

automaster : this modem option indicates whether auto-detection of the master link is enabled or not.

If disabled , auto-detection is disabled.

If enabled , the master link is detected automatically. This can be necessary if the DSLAM uses 4-wireenhanced mode.


fastdrop : this modem option indicates when a link is dropped.If disabled , the modem receives an event from the physical layer when the link is dropped.

If enabled , the modem drops the link if it receives a trigger indicating that the Signal-to-Noise Ratio(SNR) dropped below 0 dB. In this case, the link is dropped sooner as the modem does not try torecover the link first.


force-enhanced :

If disabled , auto-detection of standard/enhanced mode is used.

If enabled , the CPE device is forced to start in 4-wire enhanced mode.


force-shdsl :

If disabled , the new style capabilities list (CL) is used during G.Hs. If this capabilities list does notresult in a common mode of operation, the old style capabilities list is used.

If enabled , the old style capabilities list is used from the beginning. This way, the CPE is forced to usethe old SHDSL standard (no EFM, no G.SHDSL bis and no M-pair mode). As a result, thesynchronization time decreases if this option is used in case of older DSLAMs, which do notunderstand the new style. It also prevents older DSLAMs to end up in a lock-up state.


force-tcpam16 :

If disabled , the modem supports both 16-TCPAM and 32-TCPAM line coding.

If enabled , the modem is forced to use 16-TCPAM line coding only. Some DSLAMs do not like 32-TCPAM line coding.


force-tcpam32 :

If disabled , the modem supports both 16-TCPAM and 32-TCPAM line coding.

If enabled , the modem is forced to use 32-TCPAM line coding only. This option is mainly used fortesting purposes.


lineprobing :

If enabled , line probing is enabled.

If disabled , line probing is disabled. This can be useful for test purposes.

By default, this option is enabled.


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5| Modem Options

simulate-lp :

If disabled , line probing is not simulated.

If enabled , line probing is simulated. This option can be used if the DSLAM does not send probingtones when asked during training. The simulation starts with a low connect rate. Then, it measuresthe SNR in showtime and based on that changes the connect rate and re-synchronizes until it has anacceptable SNR. This may take one or two re-synchronizations.


vendor-specific : this information field is included in the CL and CLR messages of the G.Hs procedure. Thelength of this field is two octets. The vendor specific octets are set to the specified octets, for example0xFF 0x00 (specified as the string ff00). If not specified, the vendor specific octets are set to 0x00 0x00(0000).


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