ETSI TS 101 524 V1.5.1 (2010-08)

Access, Terminals, Transmission and Multiplexing (ATTM); Access transmission system on metallic access cables; Symmetric single pair high bitrate Digital Subscriber Line (SDSL); [ITU-T Recommendation G.991.2 (2005), modified]

RTS/ATTM-06006

General Information

• Status: Published
• Publication Date: 01-Aug-2010
• Technical Committee: ATTM TM6 - Wireline Access Network Systems
• Current Stage: 12 - Completion
• Due Date: 01-Jul-2010
• Completion Date: 02-Aug-2010

Standards Content (Sample)

Technical Specification
Access, Terminals, Transmission and Multiplexing (ATTM);
Access transmission system on metallic access cables;
Symmetric single pair high bitrate
Digital Subscriber Line (SDSL)
[ITU-T Recommendation G.991.2 (2005), modified]

2 ETSI TS 101 524 V1.5.1 (2010-08)

Reference
RTS/ATTM-06006
Keywords
access, adaption, basic, coding, digital, HDSL,
IP, ISDN, local loop, PSTN, rate, SDSL,
subscriber, transmission, xDSL
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
Individual copies of the present document can be downloaded from:
http://www.etsi.org
The present document may be made available in more than one electronic version or in print. In any case of existing or
perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).
In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive
within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2010.
All rights reserved.
TM TM TM TM
DECT , PLUGTESTS , UMTS , TIPHON , the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered
for the benefit of its Members.
TM
3GPP is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners.
LTE™ is a Trade Mark of ETSI currently being registered
for the benefit of its Members and of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 ETSI TS 101 524 V1.5.1 (2010-08)
Contents
Intellectual Property Rights . 4
Foreword . 4
Endorsement notice . 4
Global modifications to ITU-T Recommendation G.991.2 . 5
Annex ZA (informative): Transmission medium . 12
ZA.1 Description . . 12
ZA.2 Physical characteristics of a Digital Local Line (DLL) . 12
ZA.3 Electrical characteristics of a Digital Local Line (DLL) . 13
ZA.3.1 Principal Transmission characteristics . 13
ZA.3.2 Crosstalk characteristics . 13
ZA.3.3 Unbalance about earth . 13
ZA.3.4 Impulse noise . 13
ZA.3.5 Micro interruptions . 13
ZA.4 Minimum Digital Local Line (DLL) requirements for SDSL applications - no loading coils . 13
Annex ZB (informative): Environmental requirements . 14
ZB.1 Climatic conditions . 14
ZB.2 Safety . 14
ZB.3 Over-voltage protection . 14
ZB.4 Electromagnetic compatibility . 14
Annex ZC (informative): Transmission and reflection of cable sections . 15
ZC.1 Definition of transfer function and insertion loss . 15
ZC.2 Derivation of s-parameters from primary cable parameters . 16
Annex ZD (informative): Void . 17
Annex ZE (informative): Tabulation of Annex G noise profiles. 18
History . 20

ETSI
4 ETSI TS 101 524 V1.5.1 (2010-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Access, Terminals, Transmission
and Multiplexing (ATTM).
The present document is partly based on the T1E1 HDSL2 specification. In turn, the ITU-T Recommendation G.991.2
(G.shdsl) annex B text was largely based on earlier versions of the present document. Efforts have been made to ensure
that the ITU G.shdsl and ETSI SDSL work items were kept in line. To facilitate this alignment this revision of the
present document was produced as an endorsement of ITU-T Recommendation G.991.2 (2005) with modifications and
additions.
Endorsement notice
The present document, in conjunction with ITU-T Recommendation G.991.2 (2005) provides the specification for
Symmetric single pair high bitrate Digital Subscriber Line (SDSL).
NOTE: The current revision of ITU-T Recommendation G.991.2 consists of four documents:
• ITU-T Recommendation G.991.2, December 2003.
• ITU-T Recommendation G.991.2, Amendment 1, July 2004.
• ITU-T Recommendation G.991.2, Amendment 2, December 2004.
• ITU-T Recommendation G.991.2, Amendment 3, September 2005.
ETSI
5 ETSI TS 101 524 V1.5.1 (2010-08)
Global modifications to ITU-T Recommendation G.991.2
Replace throughout the entire document G.991.2 the terms and abbreviations as shown in the table below.
Terminology and Nomenclature in G.991.2 Terminology and Nomenclature as Modified by ETSI TS 101 524
Central Office Network Side
SHDSL SDSL
Single-Pair High-bit-rate DSL Symmetric single pair high bit rate Digital Subscriber Line
STU TU
SHDSL Transceiver Unit SDSL Termination Unit
STU-C LTU
STU at the Central Office Line Termination Unit
STU-R NTU
STU at the Remote End Network Termination Unit
TC-PAM UC-PAM
Trellis Coded Pulse Amplitude Modulation Ungerboeck Coded Pulse Amplitude Modulation
TCM UCM
Trellis Coded Modulation Ungerboeck Coded Modulation

Clause 2 "References"
Add the following references:
[13] ETSI EN 300 019 (all parts): "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment".
[14] ETSI EN 300 386: "Electromagnetic compatibility and Radio spectrum Matters (ERM);
Telecommunication network equipment; ElectroMagnetic Compatibility (EMC) requirements".
[15] ITU-T Recommendation K.20 (2008): "Resistibility of telecommunication equipment installed in a
telecommunications centre to overvoltages and overcurrents".
[16] ITU-T Recommendation K.21 (2008): "Resistibility of telecommunication equipment installed in
customer premises to overvoltages and overcurrents".
[17] ITU-T Recommendation K.44 (2008): "Resistibility tests for telecommunication equipment exposed
to overvoltages and overcurrents - Basic Recommendation".
[18] ITU-T Recommendation K.45 (2008): "Resistibility of telecommunication equipment installed in the
access and trunk networks to overvoltages and overcurrents".
Clause 4 "Reference models"
Append to this clause the new clauses 4.4 and 4.5.
4.4 Physical reference configuration
Figure 4-4 shows the reference configuration of an SDSL transmission system.
ETSI
6 ETSI TS 101 524 V1.5.1 (2010-08)
SDSL TRANSMISSION SECTION
NB-Interface NB-Interface
Options: SDSL CORE Options:
ISDN-BA ISDN-BA
transparent to CORE FRAME payload
POTS POTS
Clock & Synchronization Information
(Optional)
SDSL SDSL Mapping
Mapping Common
Common REG
NB NB
transceiver Functions
Functions transceiver
Circuitry Circuitry
Interface
Interface
Application
Main-
(TPS-TC)
(TPS-TC)
Main-
Main- Functions
Functions
tenance Interfaces
tenance (TPS)
(TPS) tenance
Mainte- Main- Main-
Mainte-
BB BB
nance
tenance tenance nance
Core Functions (PMS) Core Functions (PMS)
BB-Interface BB-Interface
Maintenance
Options: Options:
Maintenance
Maintenance
Channel
... ...
NTU LTU
Interface
Interface
CORE FRAME
.... ....
Digital Local
Customer side
Network side
Lines (DLLs)
Figure 4-4: Protocol reference model
The reference configuration provides for a bi-directional symmetrical channel with a variable bit rate that is under the
control of the network management system of the operator. In the optional M-pair mode the distribution of the
aggregate bitstream to the M SDSL core systems is carried out by the TPS-TC functionality of the mapping functions
which are specified for the different applications in annex E. An option is provided for transporting an independent
narrowband channel. The narrowband channel shall be able to carry an ISDN-BA whose clock domain is not
necessarily the same as that of the rest of the channel. The narrowband channel shall alternatively be capable of
supporting analogue telephone channels. Remote power feeding shall be provided by the central office. In this case, a
reduced power mode (for lifeline service in case of local power failure) may be provided for the ISDN-BA or one
analogue telephone connection.
The multiplexing of additional narrowband channels into the data channel is not precluded. Lifeline service is not
required for these channels.
The SDSL transmission system consists of the following functional blocks:
- interface functions;
- mapping functions;
- common circuitry;
- SDSL transceiver;
- optional regenerators.
The functions at the central office side constitute the Line Termination Unit (LTU) and act as master to the customer
side functions, which constitute the Network Termination Unit (NTU), and to a regenerator where applicable.
The common circuitry providing for Physical Medium Specific Transmission Convergence (PMS-TC) Layer and the
SDSL transceivers comprise the core functions of the NTU and the LTU which, along with the Digital Local Line
(DLL), make up the SDSL core. The DLL is commonly a metallic twisted pair and may contain regenerators if an
enhanced transmission range is required. In optional configurations, the DLL can be M copper twisted pairs
(M-pair mode). In that case, each SDSL Termination Unit contains M separate PMD layers, interfacing to a common
PMS-TC layer.
A regenerator may be inserted at any convenient intermediate point in the SDSL core with appropriate insertion loss
consideration. Power feeding and lifeline service may restrict the maximum achievable loop reach. In the optional
M-pair mode, M-pair regenerators may be used when this reach extension is required.
The SDSL core is application independent. It transparently transports the SDSL frames that it receives at its internal
interfaces.
The mapping functions and the interface functions are application dependent and Transmission Protocol Specific (TPS).
The mapping function handles the Transmission Convergence (TC) Layer of the specific application including the
maintenance and the mapping of the application frames into the SDSL frame. The TC-functions contain:
- channel multiplexing and demultiplexing;
ETSI
7 ETSI TS 101 524 V1.5.1 (2010-08)
- framing;
- frame synchronization;
- error detection;
- justification;
- maintenance.
The interface functional block provides interfaces to the data channel and the optional narrowband subchannel. The
physical characteristics of the interfaces are application dependent. Implementation details are defined in the application
descriptions.
The interfaces between the functional blocks are only logical separations and are not required to be physically
accessible.
A clear embedded operations channel (eoc) is provided for within the system frame structure. The SDSL core is
specified so as to promote interoperability of equipment from different vendors.
4.5 Functions
The functions listed in table 4-1 are necessary for the correct operation of the SDSL core.
Table 4-1: Necessary functions
Functions related to the SDSL core LTU NTU/ REG
Transparent transport of SDSL frames <---->
Stuffing and destuffing <---->
Transmission error detection <---->
Error reporting <---->
Failure detection <---->
Failure reporting <---->
Bit timing <---->
Frame alignment <---->
Power back-off <---->
Transceiver start-up control ----->
Loopback control and co-ordination <---->
Synchronization of SDSL transceivers ----->
Remote power feeding ----->
Wetting current ----->
4.5.1 Transparent transport of SDSL frames
This function provides for the bi-directional transmission of the SDSL frames.
4.5.2 Stuffing and destuffing
This function, when used, provides for the synchronization of the application data clock to the SDSL transceiver system
clock, by means of adding zero or four stuffing bits per SDSL frame.
4.5.3 Transmission error detection
This function provides for error performance monitoring of the SDSL transceiver systems in each SDSL frame.
4.5.4 Error reporting
This function provides for the reporting of errors detected.
4.5.5 Failure detection
This function provides for the detection of failures in the SDSL transceiver system.
ETSI
8 ETSI TS 101 524 V1.5.1 (2010-08)
4.5.6 Failure reporting
This function provides for the reporting of failures detected in the SDSL transceiver systems.
4.5.7 Bit timing
This function provides bit timing to enable the SDSL transceiver systems to recover information from the aggregate bit
stream.
4.5.8 Frame alignment
This function provides information to enable the SDSL transceiver systems to recover the SDSL frame.
4.5.9 Power Back-Off (PBO)
The transmitter shall have the ability to reduce its transmitted power in order to reduce crosstalk with transmission
systems operating in the same multi pair cable. The power back-off function shall be provided in both directions of
transmission. The reduction of power shall be controlled by the management system. The assignment of power back-off
values in 4-wire/M-pair mode shall be as specified in clause 9.2.6.
4.5.10 Transceiver start-up control
This function provides for the activation to reach the operational state. It may contain a preactivation procedure.
4.5.11 Loopback control and co-ordination
This function provides for the activation and deactivation of loopbacks in the LTU, the REG and the NTU.
4.5.12 Synchronization of SDSL transceivers
This function provides for the synchronization of the SDSL transceiver systems.
4.5.13 Remote power feeding
This function provides for remote power feeding of the NTU and/or the regenerators from the LTU.
4.5.14 Wetting current
This optional function provides for feeding of a low current on the pair to mitigate the effect of corrosion of contacts.
Clause 7 "PMS-TC Layer Functional Characteristics"
Modify clause 7.1.2.1 and add the following text:
7.1.2.1 sw1 - sw14 (Frame Sync Word)
The frame synchronization word (FSW) enables SHDSL receivers to acquire frame alignment. The FSW (bits sw1 -
sw14) is present in every frame. The synchronization word consists of the following 14-bit sequence: 11111100001100.
This sequence shall be passed as a parameter for both upstream and downstream directions during the pre-activation;
The SW is present in every frame and is the same in both the upstream and downstream directions.
Clause 9 "Management"
Add the following text to clause 9.2:
9.2.8 Loss of local power
The STU-R shall indicate loss of local power to the STU-C through ps-bit. The STU-R shall be able to send the ps-bit in
at least 1 and preferably 3 consecutive frames after losing local power. If the ps-bit is set for less than three frames, it is
up to the application at the STU-C layer to determine the validity of the message.
ETSI
9 ETSI TS 101 524 V1.5.1 (2010-08)
9.2.9 Loss of Signal (LOS)
The Loss Of Signal flag (LOS = ONE) indicates that no signal is detected on the line. LOS = ZERO indicates that a
signal has been detected. The LOS at the STU-R side is set to zero as soon as the S signal is detected. The LOS at the
c
STU-C side is set to zero as soon as the S signal is detected. LOS at the line side of the STU-C, STU-R or REG leads
r
to a deactivation of the respective path after 2 s and therefore always results in an LOS message from the SDSL core to
the Operation & Maintenance (O&M) functional block in the STU-C. The STU-C O&M unit cannot determine however
the location of the fault.
Annex A "Regional Requirements - Region 1"
Delete annex A. It is not applicable.
Annex C "Regional Requirements - Region 3"
Delete annex C. It is not applicable
Annex E "Application-specific TPS-TC Framing"
Delete clause E.3 (TPS-TC for Unaligned DS1 Transport).
Delete clause E.4 (TPS-TC for Aligned DS1/Fractional DS1 Transport).
Delete clause E.12 (TPS-TC for STM with a Dedicated Signalling Channel (DSC)).
These TPS-TCs are not applicable.
E.10.2 Dual Bearer Mode Types
Modify table E-22 as follows.
Table E-22: Supported TPS-TCs in Dual Bearer Mode
Type Description TPS-TC TPS-TC
a b
1 STM + Synchronous ISDN BRA (clause E.8) Clear Channel (clause E.1)
Broadband LAPV5 Enveloped POTS or ISDN Clear Channel Byte-Oriented (clause E.2)
(clause E.13) (see note) Unaligned D2048U (clause E.5) (see note)
TU-12 (E.14) Unaligned D2048S (clause E.6) (see note)
Aligned D2048S/Fractional D2048S
(clause E.7) (see note)
ATM (clause E.9)
PTM (HDLC based) (clause E.11)
PTM (64/65-Octet based) (clause E.15)
2 STM + Cell / Unaligned D2048U (clause E.5) (see note) ATM (clause E.9)
Packet Unaligned D2048S (clause E.6) (see note) PTM (HDLC based) (clause E.11)
Aligned D2048S/Fractional D2048S PTM (64/65-Octet based) (clause E.15)
(clause E.7) (see note)
TU-12 (E.14)
3 STM + Clear Unaligned D2048U (clause E.5) (see note) Clear Channel (clause E.1)
Channel Unaligned D2048S (clause E.6) (see note) Clear Channel Byte-Oriented (clause E.2)
Aligned D2048S/Fractional D2048S
(clause E.7)
TU-12 (clause E.14)
NOTE: Denotes TPS-TC modes that typically apply only in European networks. TPS-TC has to be used for
a
services, which require 8 kbit/s granularity.

Annex F "Region 1 Requirements for Data Rates between 1
...