1、 ETSI TS 101 524 V1.5.1 (2010-08)Technical Specification Access, Terminals, Transmission and Multiplexing (ATTM);Access transmission system on metallic access cables;Symmetric single pair high bitrateDigital Subscriber Line (SDSL)ITU-T Recommendation G.991.2 (2005), modifiedETSI ETSI TS 101 524 V1.5
2、.1 (2010-08)2Reference 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.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562
3、 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture 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 a
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7、 2010. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. LTE is a Trade Mar
8、k 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 ETSI TS 101 524 V1.5.1 (2010-08)3Contents Intellectual Property Rights 4g3Foreword . 4g3Endorsement noti
9、ce 4g3Global modifications to ITU-T Recommendation G.991.2 5g3Annex ZA (informative): Transmission medium . 12g3ZA.1 Description . 12g3ZA.2 Physical characteristics of a Digital Local Line (DLL) 12g3ZA.3 Electrical characteristics of a Digital Local Line (DLL) 13g3ZA.3.1 Principal Transmission chara
10、cteristics . 13g3ZA.3.2 Crosstalk characteristics . 13g3ZA.3.3 Unbalance about earth 13g3ZA.3.4 Impulse noise 13g3ZA.3.5 Micro interruptions . 13g3ZA.4 Minimum Digital Local Line (DLL) requirements for SDSL applications - no loading coils . 13g3Annex ZB (informative): Environmental requirements 14g3
11、ZB.1 Climatic conditions 14g3ZB.2 Safety 14g3ZB.3 Over-voltage protection 14g3ZB.4 Electromagnetic compatibility . 14g3Annex ZC (informative): Transmission and reflection of cable sections . 15g3ZC.1 Definition of transfer function and insertion loss . 15g3ZC.2 Derivation of s-parameters from primar
12、y cable parameters . 16g3Annex ZD (informative): Void . 17g3Annex ZE (informative): Tabulation of Annex G noise profiles. 18g3History 20g3ETSI ETSI TS 101 524 V1.5.1 (2010-08)4Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI.
13、 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
14、 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
15、 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 p
16、artly 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
17、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 bit
18、rate 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 Recommendatio
19、n G.991.2, Amendment 3, September 2005. ETSI ETSI TS 101 524 V1.5.1 (2010-08)5Global 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 Nomenclat
20、ure 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 TUSHDSL Transceiver Unit SDSL Termination Unit STU-C LTU STU at the Central Office Line Termination Unit STU-R NTU STU at the Remote
21、 End Network Termination Unit TC-PAM UC-PAM Trellis Coded Pulse Amplitude Modulation Ungerboeck Coded Pulse Amplitude Modulation TCM UCTrellis Coded Modulation Ungerboeck Coded Modulation Clause 2 “References“ Add the following references: 13 ETSI EN 300 019 (all parts): “Environmental Engineering (
22、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): “
23、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 (
24、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 “Ref
25、erence 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 ETSI TS 101 524 V1.5.1 (2010-08)6BB-Interface Options: . SDSL transceiver Common Circuitry Main- tenance Main- tena
26、nce Mapping Functions (TPS-TC) Mainte- nance Maintenance LTU REG Main- tenance Common Circuitry Main- tenance SDSL transceiver Main- tenance Maintenance Channel CORE FRAME Clock - mapping functions; - common circuitry; - SDSL transceiver; - optional regenerators. The functions at the central office
27、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 SD
28、SL 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
29、 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 l
30、ifeline 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 m
31、apping 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. T
32、he TC-functions contain: - channel multiplexing and demultiplexing; ETSI ETSI TS 101 524 V1.5.1 (2010-08)7- framing; - frame synchronization; - error detection; - justification; - maintenance. The interface functional block provides interfaces to the data channel and the optional narrowband subchann
33、el. 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 ch
34、annel (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 Fu
35、nctions 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 Sync
36、hronization 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 applic
37、ation 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 prov
38、ides 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 ETSI TS 101 524 V1.5.1 (2010-08)84.5.6 Failure reporting This function provides for the reporting of failures detected in the SDSL transceiver
39、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 (PB
40、O) 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
41、 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
42、 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 r
43、emote 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 f
44、ollowing 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
45、 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 indicat
46、e 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 m
47、essage. ETSI ETSI TS 101 524 V1.5.1 (2010-08)99.2.9 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 Scsignal is detected. The LOS a
48、t the STU-C side is set to zero as soon as the Srsignal is detected. LOS at the line side of the STU-C, STU-R or REG leads 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 Optical Access Networks (OANs) for evolving
49、 services; ATM Passive Optical Networks (PONs) and the transport of ATM over digital subscriber lines“. B22 ETSI ES 201 970: “Access and Terminals (AT); Public Switched Telephone Network (PSTN); Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented Network Termination Point (NTP)“. B23 ETSI EN 300 659-1: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 1: On-hook data tra
