1、3400855 008002L 819 ETSI ETR 248 January 1996 Source: ETSI TC-TM Reference: DTWM-03057 ICs: 33.180 Key words: transmission, mux, monomode, fibre Transmission and Multiplexing (TM); Use of single-mode fibre in the access network ETSI European Telecommunications Standards Institute ETSI Secretariat Po
2、stal address: F-06921 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: secretariat9etsi.fr Tel.: +33 92 94 42 O0 - Fax: +33 93 65 47 16 Copyright Notification: No part may be reproduc
3、ed except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. Q European Telecommunications Standards Institute 1996. All rights resewed. I Page 2 ETR 248: January 1996 Whilst every care has been taken in the preparation and publicati
4、on of this document, errors in content, typographical or othetwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. - ETSI ETRx248 96 W 3Y00855 0080023 b91 Page 3 ETR 248: January 1996 Content
5、s Foreword . 5 4 Scope 7 References 7 Definitions and abbreviations 8 3.1 Definitions 8 3.2 Abbreviations . 9 General 10 4.1 Bearer capabilities . 10 4.2 Interfaces . 10 Interfaces at the network-side . 10 Interfaces at the user-side . 10 4.2.1 4.2.2 Configuration of an optical access network . 11 5
6、.1 Architectural configuration of an optical access network . 11 5.2 Application of state machines to the architectural configuration 13 5.3 Integration of the ISDN reference model onto the OAN architectural configuration 14 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.1 1 6.12 6.13 General requiremen
7、ts of an optical access network . 15 Wavelength allocation 15 ONU functional definition . 15 6.2.1 Description of functions . 16 Optical power budget . 17 Upgrade possibilities 19 6.4.1 ODN Considerations . 19 6.4.2 ONU Considerations . 19 6.4.3 Protocols . 20 Operations. Administration and Maintena
8、nce (OAM) 20 6.5.1 Analysis of OAM requirements by functional sub-systems . 20 6.5.2 Analysis of OAM requirements by functional category 22 6.5.2.1 Access and security . 23 6.5.2.2 Configuration and resource management . 23 6.5.2.3 Performance management 24 6.5.2.4 Event (alarm) management . 24 Secu
9、rity 25 6.6.1 Reasons for security 26 6.6.2 Reference model (functional model of OAN) 26 6.6.3 Threats 26 6.6.4 Requirements 26 6.6.5 Functions and mechanisms 26 6.6.6 integration of additional security 26 6.6.7 Secur management . 26 6.6.8 Security recommendations 26 Safety . 27 Reliability and avai
10、lability . 27 6.8.1 Methodology steps 27 Reliability related parameters 27 6.8.2 6.8.3 Availability 27 User-network interfaces and network interfaces . 28 Leased line bearer capabilities for n x 2 Mbit/s 28 Transfer signal delay 28 ODN functional definition . 29 OLT functional definition 29 6.13.1 D
11、escription of functions . 30 ETSI ETR*248 96 3400855 0080024 528 Page 4 ETR 248: January 1996 7 Short-tem solutions . 31 7.1 Introduction 31 7.2 Architectural configuration . 31 7.3 Interactive services 34 7.4 Distributive services 34 7.5 Exchange interface . 34 7.6 Operations, Administration and Ma
12、intenance (OAM) 34 7.7 Powering . 34 Annex A: Examples of possible implementations of an OAN 35 History . 36 - - ETSI ETRr248 96 m 3400855 0080025 464 Page 5 ETR 248: January 1996 Foreword This ETSI Technical Report (ETR) has been produced by the Transmission and Multiplexing (TM) Technical Committe
13、e 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-ETC) status. An ETR may be used to publish material wh
14、ich 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 LETS. This ETR was originally published as an internal Technical Committee report (TM-TR002) and was therefore only availabl
15、e with the TM Technical Committee. It is now published as an ETR, with its technical content unchanged, to allow the document to be made publicly available. ETSI ETR*248 96 m 3400855 O080026 3TO Page 6 ETR 248: January 1996 Blank page ETSI ETR*248 9b W 3400855 0080027 237 Page 7 ETR 248: January 199
16、6 1 Scope This ETR describes the results of the studies of the use of single-mode fibre in the access network, referred to in this report as the Optical Access Network (OAN). It has identified a number of functions that are required and has begun to list those functions that require to be studied. T
17、here may even be a requirement not to define (standardize) some of the functions identified. Where it has been possible to provide a definition in suitable text for a function, it is given in this report. However where a definition requires further study, this is indicated accordingly. As this netwo
18、rk may carry analogue and digital signals, this ETR describes the characteristics of an access network using monomode fibre (single mode) between the user network and the local exchange, or head end, that allows evolution from the Plain Old Telephony Service (POTS) and similar bearer services to the
19、 Broadband Integrated Services Digital Network (B-ISDN) bearer service without the requirement to re-cable the installed fibre access. It has also been identified that there may be studies in other standardisation bodies that could have an impact on the requirements of the access network. As there h
20、as not been any input from these bodies at this time, their requirements have not been considered. 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 h
21、ereafter. For dated references, subsequent 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. I21 i31 141 151 91 I1 O1 ETS 300 007 (1991): “
22、Integrated Services Digital Network (ISDN); Support of packet mode terminal equipment by an ISDN“. ETC 300 O1 1 (1992): “Integrated Services Digital Network (ISDN); Primary rate user-network interface; Layer 1 specification and test principles“. ETC 300 012 (1992): “Integrated Services Digital Netwo
23、rk (ISDN); Basic user- network interface; Layer 1 specification and test principles“. ETS 300 166 (1 993): “Transmission and Multiplexing (TM); Physical characteristics of hierarchical digital interfaces for equipment using the 2048 kbit/s-based plesiochronous or synchronous digital hierarchies“. ET
24、C 300 167 (1 993): “Transmission and Multiplexing (TM); Functional characteristics of 2 048 kbitk interfaces“. ETSI 300 300 (1 995): “Broadband Integrated Services Digital Network (B-ISDN); Synchronous Digital Hierarchy (SDH) based user network access; Physical layer interfaces for B-ISDN applicatio
25、ns“. ETS 300 324-1 (1 994): “Signalling Protocols and Switching (SPS); V interfaces at the digital Local Exchange (LE); V5.1 interface for the support of Access Network (AN); Part 1: V5.1 interface specification“. ITU Recommendation X.25 (1 993): “Interface between Data Terminal Equipment (DTE) and
26、Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit“. ITU Recommendation G.652 (1 993): “Characteristics of a single-mode optical fibre cable“. EC SYN 287 (1990): “Proposal for the council directive concerning
27、 the protection of individuals in relation to the processing of personal data“. - - _ ETSI ETR*:248 96 = 3400855 0080028 173 = Page 8 ETR 248: January 1996 I1 11 EC SYN 288 (1990): “Proposal for the directive concerning the protection of personal data and privacy in the context of public digital tel
28、ecommunication networks, in particular the integrated sewices digital network (ISDN) and public digital mobile networks“. 11 51 ETS 300 233 (1994): “Integrated Services Digital Network (ISDN); Access digital section for ISDN Primary rate“. ETS 300 347-1 (1994): “Signalling Protocols and Switching (S
29、PS); V interfaces at the digital Local Exchange (LE); V5.2 interface for the support of Access Network (AN); Part 1 : V5.2 interface specification“. ETS 300 418 (1995): “Business TeleCommunications (BTC); 2 048 kbis digital unstructured and structured leased lines (D2048U and D2048S); Network interf
30、ace presentation“. ETS 300 288 (1 994): “Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with octet integrity (D64U); Network interface presentation“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of this ETR, the following definitions apply: diplex w
31、orking: Using a different wavelength for each direction of transmission over a single fibre. duplex working: Using the same wavelength for both directions of transmission over a single fibre. fibre: A medium used for the transport of optical signals according to ITU Recommendation G.652 9. filter: A
32、 device for the selection of optical signals at specific optical wavelengths. head end: That part of the line terminal realisation that terminates the optical functions of the access (TV distribution). multiplexing (static): A system of multiplexing where the relationship between the position of the
33、 tributaries to the multiplexed format (channels) is predetermined and fixed. multiplexing (dynamic): A system of multiplexing where the relationship between the position of the tributaries to the multiplexed format (channels) is flexible. It also allows for tributaries to be aggregated where there
34、are more tributaries than available channels and the possibility to vary the bandwidth to n times the capacity of the channels. optical splitter: A device that has n inputs with k outputs, where n 2 2 and k 2 2. passive component: A component part of the access that does not require extemal power an
35、d has reciprocal properties in both directions. .e. fibre, splitter, filter. point-to-multipoint: A transmission system which has one input at one end with multiple outputs at the other end. R (Receive) reference point: point on the optical fibre just before the Optical Line Terminal (OLT) optical c
36、onnection point (.e. optical connector or optical splice). S (Send) reference point: A point on the optical fibre just after the Optical Line Terminal (OLT) optical connection point (.e. optical connector or optical splice). simplex worklng: Using a different fibre for each direction of transmission
37、. ETSI ETR*24B 96 3400855 0080029 OOT Page 9 ETR 248: January 1996 3.2 Abbreviations For the purposes of this ETR, the following abbreviations apply: AC ND ATM AU CATV DIA DC DS DXC FITL FTTA FTTB FTTC FTTH FTTO ISDN IS NE OAM OAN ODN OLT ONU os1 OTDR PCN PON POTS PSTN TCM TDM TV VCR VF VSBIAM WDM B
38、-ISDN Alternating Current Analogue to Digital (conversion) Asynchronous Transfer Mode Adaptation Unit Broadband Integrated Services Digital Network CAble Television Digital to Analogue (conversion) Direct Current Distributive Services Digital cross Connect Fibre In The Loop Fibre To The Apartment Fi
39、bre To The Building Fibre To The Curb (Kerb) Fibre To The Home Fibre To The Office Integrated Services Digital Network Interactive Services Network Element Operations, Administration and Management Optical Access Network Optical Distribution Network Optical Line Terminal Optical Network Unit Open Sy
40、stem Interconnection Optical Time Domain Reflectometer Personal Communications Network Passive Optical Network Plain Old Telephony Service Public Switched Telephone Network Time Compression Multiplexing Time Division Multiplexing Television Video Cassette Recorder Voice Frequency Vestigial Side-Band
41、Amplitude Modulation Wavelength Division Multiplexer Page 10 ETR 248: January 1996 ETSI ETRa248 b 3400855 0080030 821 m 4 General 4.1 Bearer capabilities As a guide some of the bearer capabilities identified are listed below: POTS; leased lines; packet data; Basic access Integrated Services Digital
42、Network (ISDN); Primary rate access ISDN; n x 64 kbitls; n x 2 Mbit/s; Television (TV) distribution. B-ISDN; This list is not considered to be complete and requires further study. 4.2 Interfaces 4.2.1 Interfaces at the network-side It has been identified that there is a requirement for a 2 Mbit/s ex
43、change interface to enable the signalling requirements of POTS to be interfaced with the OAN. The new 2 Mbds interface has been defined in Wo stages: 1) an interface called V5.1, which enables POTS and Basic access ISDN to be offered via the optical access network, see ETS 300 324-1 7; 2) an interfa
44、ce called V5.2 (evolved from the V5.1 interface) with additional functions that include the requirements for the Primary rate access ISDN and a concentration capability, see ETS 300 347-1 13. For packet type data the OAN will connect to data networks using existing defined interfaces, e.g. ITU Recom
45、mendation X.25 8 and ETS 300 324 m. For leased line requirements the OAN will have the capability to either connect direct to leased line networks and private data networks via 2 MbUs interfaces, or, via the V5 interfaces for “semi-switched or part time circuits. 4.2.2 Interfaces at the user-side Ex
46、isting defined Customer-network interfaces will be used at the user-side of the OAN and include: - - - - - - - - for Basic access ISDN (see ETS 300 012 SI); for Primary rate access ISDN (see ETS 300 O1 1 2); for packet data using rates up to 64 kbitls channels (see ETS 300 007 l); for B-ISDN (see ET
47、S 300 300 SI); for n x 64 kbitls services (see ETS 300 166 4 and ETS 300 167 5); for 2 048 kbit/s digital leased lines (see ETS 300 418 14); for 64 kbis digital leased lines (see ETS 300 288 15); it has been agreed that for POTS, existing national interface specifications will used. ETSI ETRb248 %b
48、= 3400855 0080031 768 = Page 11 ETR 248: January 1996 5 5.1 The configuration of an OAN is shown in figure 1. Configuration of an optical access network Architectural configuration of an optical access network 1 - - User- side - I Access link F I I -i ODN - ODtical Access Transmission System B Figur
49、e 1 : Provisional architectural configuration for the OAN 2 Network- side Figure 1 shows the boundaries of the access link in relation to the optical access transmission system definition. The access link is defined as: “The whole of the transmission means between a given network interface and a single user interface“. The concept of access link is used in order to allow a functional and procedural description and a definition of the network requirements. NOTE 1: The user-side and the network-side of the access link are no
