THOMSON SHDSL, TG605s, ST620s, TG628s User Manual
Power
Ethernet
DSL-
1
Internet
4
3
2
SHDSL Configuration Guide
R8.2 and higher
Thomson Gateway
Thomson Gateway
SHDSL Configuration Guide
R8.2 and higher
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 or
inaccuracies that may appear in this document.
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Belgium
http://www.thomson-broadband.com
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Document Information
Status: v2.0 (June 2008)
Reference: E-DOC-CTC-20080313-0001
Short Title: Config Guide: SHDSL R8.2 and higher
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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
Terminology
Generally, a Thomson Gateway of the SHDSL product portfolio will be referred to as a Thomson SHDSL
device in this SHDSL Configuration Guide.
Typographical Conventions
Following 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, file
names, paths and folders).
Example: On the File menu, click Open to open a file.
Documentation and software updates
Thomson 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, visit
us at http://www.thomson-broadband.com
.
Disclaimer IP addresses
All Internet Protocol (IP) hosts that are part of examples in this document are assumed to be RFC1918
Category 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 and
concomitant.
A note provides additional information about a topic.
A caution warns you about potential problems or specific precautions that need to be taken.
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About this SHDSL Co
nfiguration Guide
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1| Introduction
1 Introduction
Introduction
SHDSL is short for Symmetric High-speed Digital Subscriber Line and is one of the several DSL flavours
offered by telecommunication providers. Its main difference with the more popular Asymmetric Digital
Subscriber 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 Thomson’s SHDSL product portfolio.
Provide a legend for back panel and connector layout.
Explain the relevant SHDSL aspects in detail.
Familiarize the reader with Thomson’s 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 Standard
Compliancy” on page 5 for more information.
Inevitably, in explaining the operation and configuration of the Thomson SHDSL devices, certain higher layer
aspects (bridging, routing, QoS, VLANs and so on) will be touched. These will be explained if necessary, but
for specific details the appropriate documentation must be consulted.
SHDSL features
All 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 device
in 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
Terminology
This paragraph briefly describes several DSL-related terms that are used throughout this Configuration
Guide:
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 to
as 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 be
added to a single DSL interface. This way, the DSL interface can be used to refer to a single link or
multiple 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 the
network processor (NWP). A DSL interface is associated with an internal channel, via which it exchanges
data 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 constitute
an ATM M-pair group. Data-traffic originating from the NWP will be byte interleaved over the members of
the 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 constitute
an EFM Physical medium entity Aggregation Function (PAF) group. Similar as with ATM M-pair, datatraffic originating from the NWP will be segmented over the members of the PAF group via the EFM PAF
function. From a high level perspective, the intention of an ATM M-pair group or an EFM-PAF group is
achieving 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 the
remainder of this document.
Overview
The 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 and
EFM TC-layers and gives tentative figures of SHDSL’s link capacity.
The next chapter describes Thomson’s SHDSL product portfolio and explains the LED behaviour on the front
panel and the connectors on the back panel.
Chapter 4 explains the configuration and operation of the Thomson SHDSL interface in detail, using the
Command-Line Interface (CLI). The description of a simple back-to-back setup helps the SHDSL beginner to
get started, while the more experienced reader can find specific information in an alphabetic list of SHDSL
CLI commands.
Finally, the last chapter pays special attention to Thomson’s SHDSL modem options. These options are
mainly intended to achieve interoperability in cases where the CO’s SHDSL implementation deviates from
standard.
This results in the following chapters:
Topi c 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
Overview
This chapter covers following topics:
2.1 Standard Compliancy
Introduction
Thomson’s SHDSL implementation attempts to be as compliant as possible with the relevant standards in
force at the time of product release. The main reason for this goal is to achieve as much interoperability with
as 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.
Topi c 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.991.2
SHDSL is mainly standardized by ITU-T Recommendation G.991.2. This recommendation is often abbreviated
as G.SHDSL. The latest standardization activities resulted in Annex F and G, which allow for higher data rates
and are referred to as G.SHDSL bis. This recommendation also specifies the optional 2-wire/4-wire operation
and 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 Thomson
SHDSL devices:
ITU-T G.994.1
SHDSL is a complex link layer and to use it in a flexible way, some form of “auto-negotiation” is needed. For
this function, SHDSL transceivers rely on ITU-T Recommendation G.994.1, often abbreviated as G.Hs. This
recommendation specifies the mechanism and procedures that DSL transceivers must use to exchange their
individual capabilities and to select a common mode of operation. The recommendation is an integral part of
the 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 transport
Annex F Region 1 requirements for payload data rates up to
5696 kbps
G.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 to
5696 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 802.3-2005
IEEE 802.3-2005 Clause 56 introduces Ethernet in the First Mile (EFM). Several physical layers are specified for
optical fiber media, voice grade copper pairs and passive optical networks (PONs). It also introduces an
Operations, 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 to
voice grade copper media. This clause also specifies the optional PAF function. Clause 63 is 2BASE-TL
specific, 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 Tit le
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 First
Mile)
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
Introduction
Thomson SHDSL devices support two Transmission Convergence (TC) layers: the traditional Asynchronous
Transfer 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 SHDSL
M-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 and
disadvantages.
ATM TC - Single pair
In case the ATM TC-layer is enabled on a single SHDSL link, a stream of 53 byte ATM cells is converted into an
octet 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-pair
If multiple SHDSL links are assigned to a DSL interface, then it can operate in 4-wire mode or in the scalable
M-pair mode. In this case, the cell stream is byte-interleaved over the two pairs (4-wire mode) or over the M
pairs (M-pair mode). This aggregation method is sometimes referred to as SHDSL bonding. This technique
requires that the SHDSL links within the bonding group are all in data mode and synchronized to the same
rate.
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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