1、STD ITU T RECMN Y.120 ANNEX A-ENGL 1999 48b2591 Ob59513 2Sb NTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Y.120 Annex A (02/99) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE General G lobai information infrastructure scenario methodology Annex A: Examples o
2、f use ITU-T Recommendation Y. 120 - Annex A (Previously CCIlT Recommendation) STD-ITU-T RECMN Y-320 ANNEX A-ENGL 3999 4852573 Ob595114 lb2 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION IN FRASTRUCTU RE II 11 General Y.100-Y.199 Services, applications and middleware Network aspects Interfaces and
3、 protocols Numbering, addressing and naming Operation, administration and maintainance Security Y .200-Y .299 Y.300-Y .399 Y .40O-Y .499 Y.500-Y.599 Y.600-Y.699 Y .70O-Y .799 For firther details, please refer to ITU-T List of Recommendatiom. STD-ITU-T RECMN Y.120 ANNEX A-ENGL 1997 48b2593 Ob59535 OT
4、9 ITU-T RECOMMENDATION Y.120 GLOBAL INFORMATION INFRASTRUCTURE SCENARIO METHODOLOGY ANNEX A Examples of use Summary This Annex presents scenario examples, based on the methodology described in Recommendation Y. 120, primarily oriented towards provision of voice, data and video services. Source Annex
5、 A to ITU-T Recommendation Y.120, was prepared by ITU-T Study Group 13 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 15* of February 1999. Recommendation Y.l20/Annex A (02/99) i - STD-ITU-T RECMN Y-120 ANNEX A-ENGL 1779 m 4862571 Ob595Lb T35 m FOREWORD ITU (Internatio
6、nal Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendati
7、ons on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IT-T Study Groups which, in their turn, produce Recommendations on these topics. The
8、approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recornmendati
9、on the term recognized operating agency (ROA) includes any individual, company, corporation or governmental organization that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992). INTELLECTUAL PROP
10、ERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Properly Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whethe
11、r asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are
12、cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1999 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying an
13、d microfilm, without permission in writing from the ITU. 11 Recommendation Y.l20/Annex A (02/99) - . - STD-ITU-T RECMN Y.120 ANNEX A-ENGL 1999 W 4862591 Ob59517 971 m CONTENTS Annex A . Examples of use A . 1 A.2 A.3 A.4 AS A.6 A.7 A.8 A.9 A.10 A.11 A.12 A.13 A.14 Purpose ofthe scenarios . Abbreviati
14、ons . Reference model . Components Interface points . The scenarios Scenario 1 - Provision of voice/data/video service over existing infrastructure Scenario 2 - Provision of voice/data/video services over cable networks using Scenario 3 - The use of ADSL or VDSL to provide video bandwidth over coppe
15、r pairs Scenario 4 - Fibre access scenario . Scenario 5 - The use of radio in the local loop B-ISDN . Scenario 6 - Access using satellites . Scenario 7 - Example of Internet access Summary of scenarios Page 1 1 1 2 3 3 3 4 8 11 13 15 17 19 22 . Recommendation Y.lLO/Annex A (02/99) 111 Recommendation
16、 Y.120 GLOBAL INFORMATION INFRASTRUCTURE SCENARIO METHODOLOGY ANNEX A Examples of use (Geneva, 1999) A.l Purpose of the scenarios The scenarios are intended to: a) facilitate the identification of key interface points in a scenario; b) facilitate classification of interfaces by an appropriate taxono
17、my scheme; cl facilitate identification of services that can be carried across such interfaces; d) facilitate classification of services by an appropriate taxonomy scheme; e) facilitate identification of end points for service delivery; 0 facilitate investigation of interplay between all components;
18、 8) accommodate the protocols involved, either directly or indirectly, at a given interface; h) be generic enough to facilitate scenario development across all technologies and standards development organizations areas. The scenario technique is also applicable to application requirements as well as
19、 network requirement s. An interface occurs between any point where two components need to communicate. Application requirements can be included in the scenarios. The scenarios currently contained in this Annex are primarily oriented towards provision of voice, data and video services. Example scena
20、rios to meet other applications requirements, such as transaction processing, distributed computing, imaging etc. need to be similarly developed. NOTE 1 - The set of examples contained within this Annex is not intended to be exhaustive. NOTE 2 - Other physical implementations may be equally valid. A
21、.2 Abbreviations Further to the abbreviations given in Recommendation Y.120, the following are additional in this Annex. ADSL Asymmetric Digital Subscriber Line ATM Asynchronous Transfer Mode B-ISDN Broadband ISDN BS Base Station CATV Cable Television CPN Customer Premises Network DSB Digital Satell
22、ite Broadcast Recommendation Y.120JAnnex A (02J99) 1 STD-ITU-T RECMN Ye120 ANNEX A-ENGL 3999 9 4Bb2593 Ob59519 744 FR FTTB FTTC FTTH HDSL HFC IN1 IP ISDN LAN N-ISDN OAM PBX PON POTS RITL UNI VDSL WLL Frame Relay Fibre to the Building Fibre to the Curb Fibre to the Home High bit rate Digital Subscrib
23、er Line Hybrid Fibre Coax Inter-Network Interface Internet Protocol Integrated Services Digital Network Local Area Network Nmw-band ISDN Operation Administration and Maintenance Private Branch exchange Passive Optical Network Plain Old Telephone Service Radio In The Loop User Network Interface Very
24、high speed Digital Subscriber Line Wireless Local Loop A.3 Reference model See Figure A.O. Wireless phone Hx Local Jx . . . f network i/ nplxunr I.“. Y. Tw 1.11 Y. T1315210-98 * To management network Figure A.0N.120 - Reference model 2 Recommendation Y.l20/Annex A (02/99) A.4 - - - - A.5 As Bs C W D
25、 E F G Hx Jx K L Mn A.6 1) 2) 3) 4) 5) 6) 7) Components Service function: such as video server and video service provider for video service, and IP router and point of presence for Internet service. Core network: such as telecommunication network, PSTN, N-ISDN, B-ISDN. Local network: such as CATV ne
26、twork, ADSLNDSL, fibre network, RITL, satellite and including access networks as described in Recommendation Y. 120. Customer Premises Network (CPN): such as access unit, TV, PC, phone, wireless phone. Si, Sj* (Ck, Cl*) x, Y* means the kind of services. means the technology of core network. means th
27、e technology of local network (access technology). Interface points Between service function and core network (s: kind of service). Between service function and local network (s: kind of service). Between service functions. Terminal interface for wireless phone. Terminal interface for phone. Termina
28、l interface for TV. Terminal interface for PC. Between acess units. Between core network and local network (x: kind of access technology). Between local network and CPN (x: kind of access technology). Between core networks. Between local networks. Between core/local network and management network (n
29、: kind of network). The scenarios Provision of voice/datdvideo service over existing infiastructure. Provision of voice/datdvideo services over cable networks using B-ISDN. The use of ADSL or VDSL to provide video bandwidth over copper pairs. Fibre access scenario. The use of radio in the local loop
30、. Access using satellites. Example of Internet access. The scenarios, shown in Figures A.l a) to A.7 b), highlight a significant number of standards related issues and questions. Recommendation Y.l2O/Annex A (02/99) 3 STD-ITU-T RECMN Ys120 ANNEX A-ENGL Lqqq 48b259L Ob59521 3T2 A.7 Scenario 1 - Provi
31、sion of voice/data/video service over existing infrastructure Logical representation - Components - Service function: Video service provider - Core network: PSTN or ISDN - Local network Cable distribution network, SAT - Local network for PSTN or ISDN is needed - CPN: TV, PC, Tel terminal, access uni
32、t for PSTN or ISDN, CATV, SAT SAT Physical representation SAT - I 1 1 PSTN or ISDN J2LlSDN -F Phone DatdPC Access unit TI31522079 Figure A.l a)N.120 - Provision of voice/data/video services over existing infrastructure 4 Recommendation Y.l2O/Annex A (02/99) Key to interfaces JpsmfisDN In the case of
33、 ISDN in Figure A.l a), the voice and data services from a telecommunication operator are extended to the user via a cable network. Questions that arise from this scenario include whether Basic Rate Interface (BRI)/Primary Rate Interface (PRI) or Signalling System No. 7 could be used at the interfac
34、e point labelled HC-w and the resulting implications for interface at points JCAw, D and F. Interface HcAw may use BRI or PRI. Flow information for Figure A.l a) In Figure A.l a) the downstream channel for delivery of video is achieved from the video server to the customer premise either: a) directl
35、y via the satellite or terrestrial broadcast facilities; or b) via the Bndeo interface between the video server and the head end of the cable distribution network one-way. Upstream information required for interactive video services is achieved from D or F in the customer premise (depending on wheth
36、er the phone or PC is used) either: Video service provider to PSTNISDN network interface; Satellite network to cable distribution network Inter-Network interface (INI); PSTNISDN cable distribution network INI; PSTNASDN core network to local network INI; PSTNISDN local network to access unit UNI. a)
37、via JpsmfisDN and or b) via JPSTNfiSDN and or fi-om the video servers via H, to the head end and then via JcAw; via JN-ISDNpSm and kdeo to the video server andor head end via HCAm; via JN-ISDNpsm and K to the video server, and/or head end via HcAw. 8 Recommendation Y.lZO/Annex A (02/99) STD-ITU-T RE
38、CMN Y.320 ANNEX Logical representation function function Components - Service function: Video server, Video service delivery point, n IP router / CPN - Core network: N-ISDN or PSTN, B-ISDN - Local network: Cable distribution network - Local network for PSTN or N-ISDN - CPN: TV, PC, Tel terminal, is
39、needed access unit for N-ISDN or PSTN, CATV Physical representation IP router / Video server Switch Switch A-K HaTV Video Switch 1 server A 1 I B-ISDN *I +I Telecommunications Video services delivery point / Cable distribution network Access unit network / -D I JN-ISDNMN + Phone Avidm N-ISDN or 7 11
40、 PSTN Video -d*” I uGvG I r igure A.L ay Y .UV - rrovision 01 voiceiaaramaeo services over one-way cable networks using B-ISDN with independent control channel Recommendation Y.lLO/Annex A (02/99) 9 Figure A.2 b) shows a similar configuration to Figure A. 1 b), except that B-ISDN is considered. In t
41、his scenario, video service can be delivered to the customer premise either via the Bvideo or H, interfaces. In addition to the kind of questions and issues raised against Figure A.l b), there is now the question of whether the two video services are compatible and whether a single interface E will
42、accommodate both. Similar considerations arise if videophone service is envisaged. Switch x- Logical representation Switch x Physical representation Components - Service function: Video server, IP router -Core network B-ISDN -Local network: Cable distribution network - CPN: TV, PC, Tel terminal, acc
43、ess unit for CATV I IP I I router I server Avidm L I Switch B-ISDN router Telecommunications network Video Video F - - Cable distribution network T1315250-98 Figure A.2 b)N.120 - Provision of voice/data/video services over two-way cable networks using B-ISDN 10 Recommendation Y.120lAnnex A (02199) -
44、 - STDmITU-T RECMN Y9120 ANNEX A-ENGL 3999 = LiBb2591 Ob59528 757 A.9 Techniques have been developed for transmitting relatively high bandwidths (1 550 MHz) over the existing copper local network, but this works only for relatively short distances. Standardized Asymmetric Digital Subscriber Line (AD
45、SL) systems have downstream (to the subscriber) bit rates up to 8.192 Mbit/s and upstream rates of up to 640 kbits. For 2 Mbit/s downstream rate, the range may be as far as 5 km depending on cable gauge, with a reduction of range with an increase of bit rate. Very high speed Digital Subscriber Line
46、(VDSL) is being developed for the range 25 to 50 Mbit/s (downstream), but for much shorter distances (50-500 m). In this case fibre is used as transport to a convenient cross-connect in the local network, before conversion to copper for the remainder of the connection. Scenario 3 - The use of ADSL o
47、r VDSL to provide video bandwidth over copper pairs Flow information for Figure A.3 Video services can be delivered to the customers premise: a) from Bvideo via JmsL; b) c Control information for video services may be exchanged: a) b) c) from the video servers via Bvideo, HmsL and HmSL to the cabine
48、t and then via JmsL; or from the video server via via JmsL, HmSL, HmsL and El, to the video server; or via JmsL, HmsL and or from via J, H, and I= router elecommunications I I distribution Fibre J,“ Fibre 0 1 Fibre distribution Phone TV PC Zibre listribution Fibre to the home AT i Fibre to the curb
49、twisted pair jmC or coax Fibre to the building Apartment building PC Ti 31 528C1-98 Figure A.4E.120 - Fibre access scenario (concluded) 14 Recommendation Y.12OlAnnex A (02199) STDeITU-T RECMN Y.120 ANNEX A-ENGL 1999 m 48b259L Ob59532 188 m A.ll Scenario 5 - The use of radio in the local loop Logical representation function network PC phone CATV unit Local Access Core network network unit w network Wireless phone Components - Service function: Video services - Core network: N-ISDN - Local networ
