BS DD CLC TS 50433-2005 Guidelines for paving the way for broadband Broadband 25 Mbit s and more for All 《所有25 Mbit s及以上宽带的铺设指南》.pdf

1、DRAFT FOR DEVELOPMENT DD CLC/TS 50433:2005 Guidelines for paving the way for broadband “Broadband, 25 Mbit/s and more for All” ICS 33.180.10 Licensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSIDD CLC/TS 50433:2005 This Draft for Development was published under the au

2、thority of the Standards Policy and Strategy Committee on 23 February 2005 BSI 23 February 2005 ISBN 0 580 45565 3 National foreword This Draft for Development is the official English language version of CLC/TS 50433:2005. This publication is not to be regarded as a British Standard. It is being iss

3、ued in the Draft for Development series of publications and is of a provisional nature because the technology is still at a developmental stage. It should be applied on this provisional basis, so that information and experience of its practical application may be obtained. Comments arising from the

4、use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible for its conversion to a European Standard. A review of this publication will be initiated 2 years after its publication by the European organization so that a decision can b

5、e taken on its status at the end of its 3-year life. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards. According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to su

6、pport the conversion into a European Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent in writing to the Secretary of BSI Subcommittee GEL/86/1, Optical fibres and cables, at 389 Chiswick High Road, London W4 4AL, giving the document reference and

7、 clause number and proposing, where possible, an appropriate revision of the text. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this d

8、ocument may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. Summary of pages This document comprises a front cover, an inside front cover, the CL

9、C/TS title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Licensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Co

10、py, (c) BSITECHNICAL SPECIFICATION CLC/TS 50433 SPECIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION February 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de

11、Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. CLC/TS 50433:2005 E ICS 33.180.10 English version Guidelines for paving the way for broadband “Broadband, 25 Mbit/s and more for All“ Leitfaden zur W

12、egbereitung fr Breitband “Breitband, 25 Mbit/s und mehr frAlle“ This Technical Specification was approved by CENELEC on 2004-09-11. CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly at national level in an appropriate

13、 form. It is permissible to keep conflicting national standards in force. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Mal

14、ta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSICLC/TS 50433:2005 - 2 - Foreword This Technical Specification was prepared by the Technical Committee CEN

15、ELEC TC 86A, Optical fibres and optical fibre cables. The text of the draft was submitted to the vote and was approved by CENELEC as CLC/TS 50433 on 2004-09-11. The following date was fixed: latest date by which the existence of the CLC/TS has to be announced at national level (doa) 2005-03-11 _ Lic

16、ensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSI - 3 - CLC/TS 50433:2005 Contents Page Introduction 4 1 Scope4 2 General .4 2.1 Typical levels of network infrastructure.4 2.2 Recommendation.4 2.3 Household future broadband needs .5 3 Different fibre penetration stra

17、tegies5 3.1 Possible scenarios .5 3.2 Constraints.5 3.3 Migration from current to high capacity transmission networks.5 4 Complementary studies.6 4.1 Criteria for choosing a scenario?6 4.2 Fibre capillarity/penetration (first-mile)?6 4.3 Level of technology maturity and economies of scale per scenar

18、io? 6 4.4 Bottleneck risks and issues? 6 4.5 Support and service co-location issues? 6 5 Standardization aspects 6 5.1 Status of standardization6 5.2 Future documents6 Annex A (informative) - Typical levels of network infrastructure7 Annex B (informative) - Status of standardization.8 Licensed Copy:

19、 Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSICLC/TS 50433:2005 - 4 - Introduction This Technical Specification is intended to provide general guidelines for improving metropolitan edge and local access networks in order to accelerate their growth in capacity and further enh

20、ance the coverage of global broadband services. The purpose is to ensure smooth migration from todays services to future services requiring very high speed transmission capabilities in all parts of the network, based on typical household expected future needs. The paper identifies different scenario

21、s to enable modular and coherent networks evolution while maintaining necessary levels of interoperability. It also reviews existing standards, and provides a draft list of standards to be developed. 1 Scope This paper globally addresses generalisation of optical fibre throughout metropolitan edge a

22、nd local access networks, including reach into end-user connections. 2 General 2.1 Typical levels of network infrastructure The reference model for communications infrastructure typically includes four levels of network: long haul or backbone, transit or metropolitan edge and back haul, access, incl

23、uding transport and local distribution, residential, including end-user connection. See schema “Typical levels of network infrastructure” in Annex A. 2.2 Recommendation While long haul (or backbone) networks have been largely equipped with optical fibre, there is still little or no fibre in access a

24、nd intermediate transmission networks. In order to meet the objective of widespread access to broadband, a gradual upgrading of todays transmission network capacities is required: first phase - ongoing: optimisation of existing copper infrastructure by deployment of DSL access 1) , cable TV network

25、upgrades and introduction of new wireless solutions (Wireless-LAN 2) , satellite, Fixed Wireless Access), 1)Evolution from asymmetrical to symmetrical access offering very high capacity (10 Mbit/s and more). 2)Including WiFi. Licensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Co

26、py, (c) BSI - 5 - CLC/TS 50433:2005 second phase: provoke with no delay the optical fibre deployment in access networks (e.g. Fibre To The x), in order to avoid bottlenecks and stifling of network growth (see scenarios below). 2.3 Household future broadband needs It is expected that the short-term f

27、uture needs of the typical household will correspond to three TV channels (3 x 5 Mbit/s for MPEG2 DVD quality encoding) plus one high-speed data channel (5 to 10 Mbit/s) including audio and voice channels. The global expected balance is a minimum of 25 Mbit/s per household. Some European countries a

28、re already considering 100 Mbit/s as a minimum. 3 Different fibre penetration strategies 3.1 Possible scenarios Three different fibre penetration scenarios can be envisaged: reconfiguration of the installed infrastructure by reuse of existing civil works (upgrade of existing conduits), use of altern

29、ative rights of way (e.g. using other types of conduits already available urbanised areas such as gas, water, sewage), greenfield deployments. 3.2 Constraints Each scenario should guarantee the necessary degree of coherence (migration, co-location, and interoperability) between projects and needs. P

30、rogressive evolution of existing networks and the deployment of new infrastructure should be properly balanced at the regional level. How to optimise interoperability between and within the different levels (backbone, edge and access) of communication networks should also be addressed. The rollout o

31、f optical fibre in edge and access infrastructure implies network reconfiguration and the installation of new segments (both support and equipment) in the transmission network. Such reconfiguration can notably facilitate connection of a large number of customers (end users), without having to system

32、atically create new conduits, thus bypassing prohibitive cost issues. 3.3 Migration from current to high capacity transmission networks Network evolution must be mastered as a whole, in order to ensure that within a given geographical area, increases in transmission capacity really correspond to the

33、 end user needs in that area. Global migration to high capacity networks should take place in clearly defined steps to avoid any loss in the quality of service already provided to customers. Licensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSICLC/TS 50433:2005 - 6 -

34、4 Complementary studies In view of progressive realignment in edge and local access capacities, the following subjects should be taken into account and further developed in each of the scenarios. 4.1 Criteria for choosing a scenario? 4.2 Fibre capillarity/penetration (first-mile)? 4.3 Level of techn

35、ology maturity and economies of scale per scenario? 4.4 Bottleneck risks and issues? 4.5 Support and service co-location issues? 5 Standardization aspects The first two scenarios described in Clause 3 have been adopted for further study by CENELEC in the framework of the e-Europe 2003 action plan, o

36、ther related studies are being addressed at ISO/IEC. 5.1 Status of standardization Annex B provides an open list of the main approved or ongoing CENELEC documents related to infrastructure development. 5.2 Future documents Ongoing: EN 50174 series “Information technology - Cabling installation” Sche

37、duled: e-Europe studies - CLC/TC 86A and CLC/TC 215 - prES XXX “Alternative rights of way, existing urban conduits” - update of EN 187105 To be launched: - reconfiguration operator and customer infrastructures - other alternative rights of way solutions - new installation technologies - new indoor c

38、abling Licensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSI - 7 - CLC/TS 50433:2005 Annex A (informative) Typical levels of network infrastructure Long haul backbone Transport distribution access Residential end user connection Transit edge back haul Licensed Copy: W

39、ang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSICLC/TS 50433:2005 - 8 - Annex B (informative) Status of standardization B.1 Components EN 50289 / EN 50290 series “Communication cables - Specifications for test methods” EN 60793 series “Optical fibres” EN 60794 series “Optical fi

40、bre cables” B.2 Installation EN 50173 series “Information technology - Generic cabling systems” EN 50174 series “Information technology - Cabling installation” EN 50310 “Application of equipotential bonding and earthing in buildings with information technology equipment” _ Licensed Copy: Wang Bin, n

41、a, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSIblank Licensed Copy: Wang Bin, na, Mon Apr 25 03:46:30 BST 2005, Uncontrolled Copy, (c) BSIDD CLC/TS 50433:2005 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for p

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