1、INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU 1.61 O Corrigendum I (03/2000) SERIES I: INTEGRATED SERVICES DIGITAL NETWORK Maintenance principles B-ISDN operation and maintenance principles and functions Corrigendum 1 ITU-T Recommendation 1.61 O - Corri
2、gendum 1 (Formerly CCITT Recommendation) ITU-T I-SERIES RECOMMENDATIONS INTEGRATED SERVICES DIGITAL NETWORK GENERAL STRUCTURE Terminology Description of ISDNs General modelling methods Telecommunication network and service attributes General description of asynchronous transfer mode Scope General as
3、pects of services in ISDN Common aspects of services in the ISDN Bearer services supported by an ISDN Teleservices supported by an ISDN Supplementary services in ISDN Network functional principles Reference models Numbering, addressing and routing Connection types Performance objectives Protocol lay
4、er requirements General network requirements and functions Application of I-series Recommendations to ISDN user-network interfaces Layer 1 Recommendations Layer 2 Recommendations Layer 3 Recommendations Multiplexing, rate adaption and support of existing interfaces Aspects of ISDN affecting terminal
5、 requirements SERVICE CAPABILITIES OVERALL NETWORK ASPECTS AND FUNCTIONS ISDN USER-NETWORK INTERFACES INTERNETWORK INTERFACES CIPLES B-ISDN EQUIPMENT ASPECTS ATM equipment Transport functions Management of ATM equipment Multiplexing aspects 1.110-1.119 1.120-1.129 1.130-1.139 1.140-1.149 1.150-1.199
6、 1.200-1.209 1.210-1.219 1.220-1.229 1.23 0-1.23 9 1.240-1.249 1.250-1.299 1.3 1 0-1.3 1 9 1.320-1.329 1.330-1.339 1.340-1.349 1.3 50-1.359 1.360-1.369 1.370-1.399 1.420-1.429 1.430-1.439 1.440-1.449 1.450-1.459 1.460-1.469 1.470-1.499 1.500-1.599 1.600-1.699 1.730-1.739 1.740-1.749 1.750-1.759 1.76
7、0-1.769 For further details, please refer to the list of ITU-T Recommendations ITU-T Recommendation 1.61 O B-ISDN operation and maintenance principles and functions CORRIGENDUM 1 Summary This corrigendum contains only editorial corrections, but no technical changes, to the third revision (02/99) of
8、ITU-T Recommendation 1.6 1 O. Source Corrigendum 1 to ITU-T Recommendation 1.610 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 i
9、n the field of telecommunications. The ITU 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 basi
10、s. The World Telecommunication Standardization 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 Reso
11、lution 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 Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration
12、 and a recognized operating agency. INTELLECTUAL 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
13、 claimed Intellectual Property Rights, whether 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 R
14、ecommendation. However, implementors are 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
15、 or mechanical, including photocopying and microfilm, without permission in writing from ITU. ITU-T Recommendation 1.610 Loopback Correlation Indication Tag B-ISDN operation and maintenance principles and functions Loopback Source ID Unused Location ID (Optional) (6AH) CORRIGENDUM 1 1) Introduction
16、This corrigendum contains only editorial corrections, but no technical changes, to the third revision (02/99) of ITU-T Recommendation 1.61 O. 2) Corrections 2.1) Subclause 9.2.2.1.1.1.3 Change the title of this subclause to “Segment sink Vc-AIS state“. 2.2) Subclause 9.2.1.1.3.2 Add to items I), 2)
17、and 6) in subclause 9.2.1.1.3.2 the word “VP“ in front of “CPs“. Replace in item 3) “5 seconds“ with “6 f 1 seconds“. 2.3) Subclause 9.2.2.1.3.2 Add to items I), 2) and 6) in subclause 9.2.2.1.3.2 the word “VC“ infront of “CPs“. Replace in item 3) “5 seconds“ with “6 f 1 seconds“. 2.4) Subclause 10.
18、2.3 o/ 1 Unused (0000000) I I 7 bits i bit TI 303670-95 Figure 14A.610 - Specific fields for loopback cell 2.5) Figure C.1 Delete the reference to Note 2) from the right-bottom test operation labelled “Loopback Location ID correct“ in Figure C. 1. The rnodi3ed Figure C. /I. 61 O is reproduced below:
19、 2.6) Annex C Replace the dash list in Annex C (above subclause C.1) with: - A segment (or end-to-end) loopback “parent“ point function located within a CP or segment endpoint shall enter the LB state as soon as a seg LB or an e-t-e LB cell is forwarded from this CP or segment endpoint cell sent wit
20、h LBndication field(L1) = i. An end-to-end loopback “parent“ point function located within a connection endpoint shall enter the LB state as soon as an e-t-e LB cell is forwarded from this connection endpoint cell sent with LB Indication field (LI)= i. At a CP, segment endpoint, or connection endpoi
21、nt the LB state is defined for a given type of loopback procedure which is characterized by both the type of LB cells used (i.e. seg-LB or e-t-e LB) and the direction of sending (i.e. towards the outside or the inside of a network element). Therefore it should be possible to manage four LB states si
22、multaneously at a given CP, two LB states simultaneously at any given segment endpoint, and one LB state at any given connection endpoint. Exit from this state shall occur after a waiting time of 6 seconds f 1 second. While in the LB state for a given type of loopback procedure, a loopback “parent“
23、point within a CP, segment endpoint, or connection endpoint shall not initiate another loopback procedure of the same type. - - - 2.7) Subclause C.l . Replace TP“ by “CP or segment end point“. Add the underlined words: iii) The content of the incoming seg LB cells shall be analysed at all crossed CP
24、s or seqnient end points that support 1oopbackirocessin.g and for which the LLID option is enabled. The content of the incoming seg-LB cells shall always be analysed at the sinlsource segment endpoints. Analysing an incoming seg-LB cell shall be a non-intrusive process. The following analysis shall
25、be performed: . if the LI field of the incoming seg - LB cell is equal to “O“, then two cases have to be considered: - the seaient loopback “parent“ point within the CP or segment endpoint is in the I “LB state“ in which case the correlation tag (and optionally the source ID) of the incoming seg LB
26、cell shall be analysed so as to check whether the loopback was performed or-not. If the loopback is performed (see Note 2 in C.2) then the “incoming“ seg-LB cell may optionally be extracted and the value of the LLID field of the “returned“ seg - LB cell shall be stored in the ATM Network Element (NE
27、) for further processing; ) Subclause C.2 Add the underlined words and delete the struck through words. ii) The content of the incoming e-t-e-LB cells shall be analysed at all crossed CPs for which the LLID oiJtioii is enabled, I . if the LI field of the incoming e-t-e-LB cell is equal to “O“, then
28、two cases have to be considered: - the end-to-end loopback “parent“ point witlziii the CP, segment endpoint or connection endpoint is in the “LB state“ in which case the correlation tag (and optionally the source ID) of the incoming e-t-e-LB cell shall be analysed so as to check whether the loopback
29、 was performed or not. If the loopback is performed (see Note 2) then the value of the LLID field of the “returned“ e-t-e-LB cell shall be stored in the ATM NE for further processing. As an option, the incoming e-t-e-LB cell may be removed at an intermediate CP or segment end-points in case of a per
30、formed loopback; I I Appendix III 2.9) Subclause 111.1 Replace the second paragraph in subclause III. 1 with: Failure categories b) and c) are supposed to affect the two directions of the VPCNCC. In case of a I bidirectional VPCNCC carrying unidirectional communication, the reverse direction carries
31、 only the OAM cells (i.e. in particular the “returned“ seg-LB cells). Add at the end of subclause II% 1 the following Note: NOTE 2 - In the event of a misrouting or misinsertion fault, segment OAM cells may be present outside the segment boundary as a consequence of this fault in the network. 2.10)
32、Subclause 111.2.2 eplace the first paragraph in subclause III 2.2 with: ent portion in-between Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series
33、X Series Y Series Z SERIES OF ITU-T RECOMMENDATIONS Organization of the work of ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telepho
34、ne telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and pr
35、otection of cables and other elements of outsib; plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment
36、Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems
