1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 1.630 Amendment I (03/2000) SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Maintenance principles ATM protection switching Amendment 1 ITU-T Recommendation 1.630 - Amendment I (Formerly CCITT Recommendation) S
2、TD.ITU-T cflp 1.b30 AND 4-ENGL 2000 m 4862593 0688634 500 m ITU-T I-SENES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK Transport functions Management of ATM equipment Multiplexing aspects 1.740-1.749 1.750-1.759 1.760-1.769 For further details, please refer to the list of ITU-T Recommendation
3、s. STDoITU-T RECMN Imh30 AMD L-ENGL 2000 m 48b259L Ob88835 947 m ITU-T Recommendation 1.630 ATM protection switching AMENDMENT 1 Summary This amendment contains only editorial enhancements and corrections, but no technical changes, to the first version (02/99) of ITU-T Recommendation 1.630. Source A
4、mendment 1 to ITU-T Recommendation 1.630 was prepared by ITU-T Study Group 13 (1 997-2000) and approved under the WTSC Resolution 1 procedure on 1 O March 2000. FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The I
5、TU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardi
6、zation Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSC Resolution l. In some areas of information t
7、echnology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTE
8、LLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, w
9、hether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are
10、 cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. o ITU 2001 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 a
11、nd microfilm, without permission in writing from ITU. STD*ITU-T RECMN 1-630 AND II-ENGL 2000 II 486259II 0688837 2LT ITU-T Recommendation 1.630 ATM protection switching AMENDMENT 1 1 Introduction This amendment contains only editorial enhancements and corrections, but no technical changes, to the fi
12、rst version (02/99) of ITU-T Recommendation 1.630. 2 Additions and corrections 2.1 Generic terminology Table 1 relates terminology used in the first version of ITU-T Recommendation generic protection terminology. Table 1D.630 - Terminology relation 1.630 term Generic protection term non-revertive sw
13、itching revertive operation revertive switching non-revertive operation I configuration I architecture 1.630 with the 2.2 1:l protection architectures The following figure illustrates the 1 : 1 protection architecture for ATM and the naminghumbering of signals and transport entities. The 1 :1 archit
14、ecture in ATM differs from the similar architecture in SDH. In ATMS 1: 1 architecture, two protection entities are defined with VPWCI of Np and E. Protection entity with VPUVCI Np is the protection entity that may carry the normal signal. If extra traffic is supported, protection entity with VPUVCI
15、E may carry the extra traffic signal. Refer to Figure 1. Supervision of SF/SD conditions apply to the working entity #1 and to the protection entity with WINCI Np. The protection protocol communication (APS OAM cell transport) only applies to the protection entity with VPUVCI Np. Selector Selector B
16、ridge SeleCtor Bridge Selector T1316220-99 Figure 1D.630 - 1:l protection architecture for ATM 2.3 Subclause 7.2.1 Add at the end of subclause 7.2. I the following sentence: The working and protection APS VPCNCCs may be monitored by the use of the ATM layer OM functions defined in ITU-T Recommendation 1.61 O.
