Introduction - THOMSON SHDSL Manual

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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
Compliancy" on page 5
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.
E-DOC-CTC-20080313-0001 v2.0
for more information.
1| Introduction
"2.1 Standard
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