1、* 1 ECHNICAL REPORT ETR 276 April 1996 Source: ETSI TC-TM Reference: DTR/TM-03062 ICs: 33.020 Key words: leased line, ONP, SDH, transmission Transmission and Multiplexing (TM); Open Network Provision (ONP) leased lines; Standardization requirements for Synchronous Digital Hierarchy (SDH) leased line
2、s ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariatetsi.fr Tel.: +33 92 94 42
3、O0 - Fax: +33 93 65 47 16 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. O European Telecommunications Standards Institute 1996. All rights reserved. Page 2 ETR 276: April
4、1996 ETSI ETR*:27b 96 R 3400855 009380L 958 = Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at th
5、e address shown on the title page. ETSI ETR*276 9b 3400855 0093802 894 Page 3 ETR 276: April 1996 Contents Foreword . 5 1 Scope 7 2 References 7 3 Abbreviations and definitions 9 3.1 Abbreviations . 9 Definitions 9 3.2 4 General considerations . 10 4.1 ONP Context 10 4.2 SDH leased line service clar
6、ifications 10 4.2.1 SDH network architecture . 10 4.2.1.1 Section layer 11 Physical section layer 11 Regenerator section layer . 12 Multiplex section layer . 12 4.2.1.2 Path layer . 12 Higher order path layer . 12 Lower order path layer 12 VC-n formats and capabilities . 12 4.2.2.1 vc-12 . 12 4.2.2.
7、2 VC-2 . 13 4.2.2.3 VC-3 . 13 4.2.2.4 VC-4 . 13 4.2.1.1.1 4.2.1.1.2 4.2.1.1.3 4.2.1.2.1 4.2.1.2.2 4.2.2 4.2.2.5 PDH signals . 13 5 Existing standards . 13 Standards relevant to interfaces 13 Standards relevant to connection characteristics 14 Relationships of the standards 14 5.1 5.2 5.3 6 Examinati
8、on of the technical requirements . 15 6.1 Connection arrangements . 15 6.1.1 Sharing of STM-N interfaces with other services 15 6.1.2 STM-N interfaces with multiple leased line connections . 16 6.2 Timing and synchronisation . 16 6.3 Interface characteristics . 16 6.3.1 Physical layer characteristic
9、s 18 6.3.2 Physical connection method 18 6.4 Connection characteristics . 19 6.4.1 VC-n structures . 19 6.4.2 VC-n overhead functions . 21 6.4.2.1 VC-12 and VC-2 21 6.4.2.1.1 End-to-end communication overhead with independent payload function 21 6.4.2.1.2 Overhead which can be overwritten in an oper
10、ator domain . 21 6.4.2.1.3 Overhead reserved for future Standardisation 21 VC-3 and VC-4 21 6.4.2.2.1 End-to-end communication overhead 6.4.2.2.2 6.4.2.2.3 Overhead reserved for future 6.4.2.2 with independent payload function 21 Payload type specific overhead 22 standardisation 22 Page 4 ETR 276: A
11、pril 1996 ETSI ETR*27b 96 3400855 0093803 720 m 6.4.2.2.4 Overhead which can be overwritten in an operator domain 22 6.4.3 VC overhead allocation for leased line services . 22 6.4.4 Transmission delay . 22 6.4.5 Error performances . 22 6.4.6 Availability . 22 7 Conclusions on proposed standards 23 7
12、.1 General conclusions 23 7.2 Proposed standards 23 7.3 Extent of the work to be done . 24 7.4 Work program . 24 8 Possible evolutions . 25 8.1 Unidirectional connections 25 8.2 Point to multipoint connections 25 8.3 Reconfiguration of leased line connection 25 8.4 New interfaces . 25 8.5 Alternativ
13、e PDH interfaces 25 8.6 Support of concatenated VC-n 26 Annex A: List of proposed SDH leased line standards 27 Annex B: Proposed tables of contents and scopes . 28 B.l Network and terminal equipment interface presentation ETS 28 B.l.l Scope 28 8.1.2 Contents 28 8.2 Connection characteristics ETS . 2
14、8 8.2.1 Scope 28 8.2.2 Contents 29 B.3 Terminal equipment VC-n presentation to SDH leased lines ETS . 30 B.3.1 Scope 30 B.3.2 Contents 30 Annex C: Proposed work program . 31 Annex D: Alternative PDH interfaces . 32 Annex E: Assignment of VC-n at leased line interfaces 33 E.l Assignment of VC-4 in ST
15、M-4 interfaces . 33 E.2 Assignment of VC-3 and TUG3 in a VC-4 . 33 E.3 Assignment of VC-2 and TUGP in a TUGS 33 E.4 Assignment of VC-12 in a TUG-2 . 33 History . 34 ETSI ETRm27b 96 U 3400855 0093804 bb W Page 5 ETR 276: April 1996 Foreword This ETSI Technical Report (ETR) has been produced by the Tr
16、ansmission and Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI). ETRs are informative documents resulting from ETSI studies which are not appropriate for European Telecommunication Standard (ETS) or Interim European Telecommunication Standard (I-ETS
17、) status. An ETR may be used to publish material which is either of an informative nature, relating to the use or the application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or an I-ETS. ETSI ETR*27b b E 3400855 0093805 5T3 Page 6 ETR 276: April 1996 Bl
18、ank page Page 7 ETR 276: April 1996 1 Scope This ETSI Technical Report has been produced in response to mandate BC-T-324 l issued to ETSI by the European Commission Directorate General III (EC DG Ill). The object of this mandate is to produce European Telecommunication Standards for access to Synchr
19、onous Digital Hierarchy (SDH) leased lines with Synchronous Transport Module-N (STM-N) network presentations at the Network Termination Point (NTP). The two parts of the mandate are, firstly, an investigation of the technical feasibility and the requirements, and secondly, depending on the agreement
20、 of the EC, the production of the relevant ETS. This ETR addresses the first part of the mandate. The ETR is written in the Open Network Provision (ONP) context defined in the ONP framework Directive 90/387/EEC 2 and the leased line Directive 92/44/EEC 3. It considers leased lines as a suitable basi
21、s to form part of a community-wide offer. It is intended that an ETS produced as a result of the second pari of the mandate will be published in the indicative, non-mandatory section of the ONP List of Standards in the Official Journal of the European Community. Two previous reports on the standardi
22、sation of other leased lines have already been produced in this context: ETR 038 4 and ETR 087 5. The ETR examines the technical aspects of the standardisation of SDH leased lines and details the work needed to produce the ETS. It covers the various technical options taking into account the current
23、situation of SDH networks and their expected evolution. 2 References This ETR incorporates by dated and undated reference, provisions from other publications. These references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent
24、amendments to or revisions of any of these publications apply to this ETR only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. 31 41 51 i71 EC DG 111: “Standardisation mandate BC-T-324 on access to SDH Leased digital
25、 Bandwidth with Standardized STM-N (N X 155 Mbit/s) Network Presentation at the NTPs“. EC Directive 90/387/EEC: “Council Directive on the establishment of the internal market for telecommunications services through implementation of Open Network Provision“. EC Directive 92/44/EEC: “Council Directive
26、 on the application of Open Network Provision to leased lines“. ETR 038: “Business Telecommunications (BT); Open Network Provision (ONP) technical requirements; Standardisation requirements for ONP leased lines“. ETR 087: “Business Telecommunications (BT); Open Network Provision (ONP) technical requ
27、irements; Standardisation requirements for ONP leased lines; Higher order leased lines“. ITU-T Recommendation G.823: “The control of jitter and wander with digital networks which are based on the 2048 kbitls hierarchy“. ITU-T Recommendation G.803: “Architecture of transport networks based on the syn
28、chronous digital hierarchy (SDH)“. ETS 300 147: “Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH) multiplexing structure“. 91 ITU-T Recommendation G.707: “Synchronous digital hierarchy bit rates“. ITU-T Recommendation G.708: “Network node interface for the synchronous digital
29、hierarchy“. 111 ITU-T Recommendation G.709: “Synchronous multiplexing structure“. Page 8 ETR 276: April 1996 i 31 11 51 ETSI ETR*K276 96 3400855 0093807 376 ETR 239: “Transmission and Multiplexing (TM); Synchronous Digital Hierarchy (SDH); List of documents relevant to SDH transmission equipment“. E
30、TS 300 417-1 -1 : “Transmission and Multiplexing (TM); Generic functional requirements for Synchronous Digital Hierarchy (SDH) equipment; Part 1-1 : Generic processes and performance“. prETS 300 41 7-2-1 : “Transmission and Multiplexing (TM); Generic functional requirements for Synchronous Digital H
31、ierarchy (SDH) transmission equipment; Part 2-1 : Physical section layer functions“. prETS 300 41 7-3-1 : “Transmission and Multiplexing (TM); Generic functional requirements for Synchronous Digital Hierarchy (SDH) equipment; Part 3-1 : STM-N regenerator and multiplex section layer functions“. prETS
32、 300 41 7-4-1 : “Transmission and Multiplexing (TM); Generic functional requirements for Synchronous Digital Hierarchy (SDH) equipment; Part 4-1 : SDH Path Layer Functions“. ITU-T Recommendation G.783: “Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks“. prETS 300 46
33、2: “Transmission and Multiplexing (TM); Generic requirements for synchronization networks“. ITU-T Recommendation G.825: “The control of jitter and wander within networks which are based on the synchronous digital hierarchy (SDH)“. ITU-T Draft Recommendation G.81 s: “Timing characteristics of SDH equ
34、ipment slave clocks (SEC)“. ETS 300 166: “Transmission and Multiplexing (TM); Physical and electrical characteristics of hierarchical digital interfaces for equipment using the 2 048 kbis - based plesiochronous or synchronous digital hierarchies“. ITU-T Recommendation G.703: “Physical/electricaI cha
35、racteristics of hierarchical digital interfaces“. ETS 300 232: “Transmission and Multiplexing (TM); Optical interfaces for equipments and systems relating to the Synchronous Digital Hierarchy ITU-T Recommendation G.957 (1 993) modified“. ITU-T Recommendation G.957: “Optical interfaces for equipments
36、 and systems relating to the synchronous digital hierarchy“. IEC 169/13: Part 13: “R.F. coaxial connectors with inner diameter of outer conductor 5,6 mm (0,22 in) - Characteristics impedance 75 ohms (Type 1,5/5,6) - Characteristics impedance 50 ohms (Type 1,8/5,6) with similar mating dimension“. ITU
37、-T Recommendation G.826: “Error performance parameters and objectives for international, constant bit rate digital paths at or above the primary rate“. LETS 300 41 6: “Transmission and Multiplexing (TM); Availability performance of path elements of international digital paths“. ETR 1 14: “Transmissi
38、on and Multiplexing (TM); Functional architecture of Synchronous Digital Hierarchy (SDH) Transport networks“. ITU-T Draft Recommendation M.2101: “Performance limits for bringing into service and maintenance of international SDH paths and multiplex sections“. ETSI ETR*2?b 96 3400855 0093808 202 Page
39、9 ETR 276: April 1996 ETS 300 337: “Transmission and Multiplexing (TM); Generic frame structures for the transport of various signals (including Asynchronous Transfer Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) elements) at the CCIlT Recommendation G.702 hierarchical rates of 2 048 kbit
40、s, 34 368 kbit/s and 139 264 kbits“. 3 Abbreviations and definitions 3.1 Abbreviations For the purposes of this ETR, the following abbreviations apply: APS ATM AUG BNC BIP-n DQDB EMC HO ISDN LO MSOH NE NT NTP ONP PABX POH PDH PRC RDI REI RFI RSOH SDH TBR TE TU-n VC-n B-ISDN PRA-ISDN STM-N Automatic
41、Protection Switch Asynchronous Transfer Mode Ad minist rat ive U nit Group Bayonet Nut Connector Bit Interleaved Parity-n Broadband Integrated Services Digital Network Distributed Queued Dual Bus Electromagnetic Compatibility Higher Order Integrated Services Digital Network Lower Order Multiplex Sec
42、tion Overhead Network Element Network Termination Network Termination Point Open Network Provision Private Automatic Branch exchange Path Overhead Plesiochronous Digital Hierarchy Primary Rate Access ISDN Primary Reference Clock Remote Defect Indicator Remote Error Indicator Remote Failure Indicator
43、 Regenerator Section Overhead Synchronous Digital Hierarchy Synchronous Transport Module-N Technical Basis for Regulation Terminal Equipment Tributary Unit-n Virtual Container-n 3.2 Definitions For the purposes of this ETR, the following abbreviations apply: connection: A transport entity which is c
44、apable of transferring information transparently between connection points. A connection defines the association between the connection points and the connection points delimit the connection. unidirectional connection: A connection which is capable of transparently transferring information from inp
45、ut to output. bidirectional connection: A connection consisting of an associated pair of unidirectional connections capable of simultaneously and transparently transferring information in opposite directions between their respective inputs and outputs. ETSI ETR*27b 7I-r 3400855 0033809 149 = Page 10
46、 ETR 276: April 1996 leased lines: The telecommunications facilities provided by a public telecommunications network that provide defined transmission characteristics between network termination points and that do not include switching functions that the user can control, (e.g. on-demand switching).
47、 Network Termination Point (NTP): All physical connections and their technical access specifications which form part of the public telecommunications network and are necessary for access to and efficient communication through that public network. Terminal Equipment (TE): Equipment intended to be con
48、nected to the public telecommunications network, .e.: a) b) to be connected directly to the termination of a public telecommunications network; to intetwork with a public telecommunications network being connected directly or indirectly to the termination of a public telecornmunications network; in
49、order to send, process, or receive information. 4 General considerations 4.1 ONP Context The regulatory framework of ONP is described in the Directive 90/387/EEC 121. Particular aspects applicable to leased lines are covered by Directive 92/44/EEC 3. ONP conditions are based on equality of access to public telecommunications networks or services. The Directive 90/387/EEC 2 sets out a procedure leading up to the publication in the official journal of the European Community of standards deemed to be suitable for open and efficient access to public network or servic
