1、STD-ITU-T RECMN Q-29bL-Z-ENGL 3777 W 48b257L ObliL214 273 W INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMU N KATION STANDARDIZATION SECTOR OF ITU Q.2961.2 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signalling (06/97) Digital subscriber signalli
2、ng system No. 2 - Additional traffic parameters: Support of ATM transfer capability in the broadband bearer capability information element ITU-T Recommendation Q.2961.2 (Previously CCIlT Recommendation) STD-ITU-T RECMN Q=27bL*Z-ENGL 1777 48b257L Ob4L2L5 L2T ITU-T Q-SERIES RECOMMENDATIONS SWITCHING A
3、ND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1-Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4-Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.604.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100-Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND N
4、o. 5 Q.120-Q.249 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250-Q.309 SPECIFICATIONS OF SIGNALLING SYSTEM RI Q.310-(2.399 SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400-Q.499 DIGITAL EXCHANGES Q.500-Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600-Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q. 7004
5、. 849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q. 85-Q .999 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NEMIORK BROADBAND ISDN Q.1000-Q.1099 Q.1100-Q.1199 Q. 1200-Q. 1999 Q.2000-Q.2999 General aspects Q.2000-Q.2099 Signalling ATM adaptation layer (SAAL) Q.2100
6、-Q.2199 Signalling network protocols Q.22004.2299 Common aspects of B-ISDN application protocols for access signalling and Q.2600-Q.2699 network signalling and interworking B-ISDN application protocols for the network sicinallinci Q.2700-Q.2899 - ., B-ISDNapplh$ad I _ OCOIS for accesssigna!iing I Fo
7、r further details, please refer to ITU-T List of Recommendations. STD.ITU-T RECMN Q.29bL=Z-ENGL 1997 m Li8b259L Oblll2Lb Obb ITU-T RECOMMENDATION 4.2961.2 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - ADDITIONAL TRAFFIC PARAMETERS: SUPPORT OF ATM TRANSFER CAPABILITY IN THE BROADBAND BEARER CAPABILITY
8、 INFORMATION ELEMENT Summary This Recommendation is part of the DSS 2 family of Recommendations. It specifies the revision of the Broadband bearer capability information element coding from that which was specified in the first edition of Recommendation 4.2931 (1995) in order to enable the identific
9、ation of the ATM transfer capability as defined in the second edition of Recommendation 1.371 (1996). This Recommendation is designed, in addition, to be compatible with implementations conforming to the first edition of ITU-T Recommendation 1.371 (1993) and Recommendation Q.293 1 (1995). Source ITU
10、-T Recommendation 4.2961.2 was prepared by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 5th June 1997. I FOREWORD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Tele
11、communication Standardization Sector (ITU-T) is a permanent organ of the IT. The 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
12、zation 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 approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1.
13、 In some areas of information technology which fail within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE I In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a
14、recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The IT draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of
15、 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, the ITU hadhad not received notice of intellectual property, protected by patents, which may be required to implement
16、 this Recommendation. 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 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, ele
17、ctronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation 4.2961.2 (06/97) - STD*ITU-T RECMN Q=29bL*2-ENGL 1997 Li8b2571 Ob41218 939 CONTENTS 2.1 Scope 2.2 References 2.3 Definitions 2.4 Abbreviations . 2.5 Description . 2.6 Coding req
18、uirements 2.6.1 Broadband bearer capability Annex A . Valid combinations of bearer class. broadband transfer capability and ATM traffic descriptor parameters . Appendix I . Guidelines on meaning of bearer class field I . 1 Bearer class . 1.1.1 BCOB-A 1.1.2 BCOB-C I . 1.3 BCOB-X 1.1.4 FR Appendix II
19、. Guidelines on use of BTC field II . 1 Guidelines on the use of BTC value of 7 . 11.2 Guidelines on the use of BTC value of 11 . 11.3 Guidelines on the use of BTC value of 19 . Recommendation 4.2961.2 (06/97) Page 1 1 1 2 2 2 2 6 11 11 11 11 11 11 11 12 12 12 . Ill Introduction This Recommendation
20、has been prepared to provide information on the use of the Broadband bearer capability that is consistent with the second edition of Recommendation 1.371. This Recommendation is issued in conjunction with an addendum to Recommendation 4.293 1. This Recommendation is designed in addition to be compat
21、ible with implementations conforming to the first edition of Recommendation 1.37 1 (1 993) and Recommendation Q.293 1 (1 995). Within this Recommendation, the changes from Recommendation 4.2931 (1995) are as follows: - Octet 5a of the Broadband bearer capability information element was restructured
22、to support the ATM Transfer Capabilities (ATC) specified in the second edition of Recommendation 1.371. This restructuring is backward compatible with the first edition of Recommendation 4.2931 (i.e. values of Octet 5a defined in the first edition of Recommendation 4.2931 still have the same meaning
23、). These values may be either those used on transmission and reception, those not generated by terminal equipment complying with this Recommendation, or those that are reserved. A new octet, Octet 7, of the Broadband bearer capability information element specified in Recommendation 4.2933, is shown.
24、 - iv Recommendation 4.2961.2 (06/97) Recommendation 4.2961.2 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - ADDITIONAL TRAFFIC PARAMETERS SUPPORT OF ATM TRANSFER CAPABILITY IN THE BROADBAND BEARER CAPABILITY INFORMATION ELEMENT (Geneva, 1997) 2.1 Scope Recommendation 4.2961 covers the support of addi
25、tional traffic parameters for the Broadband Integrated Services Digital Network (B-ISDN) at the TB reference point or coincident S, and T, reference point as defined in Recommendation 1.413 i by means of the Digital Subscriber Signalling System No. 2 (DSS 2). This Recommendation defines DSS 2 protoc
26、ol formats that support the indication of ATM trafic-related capabilities. This Recommendation is part of the DSS 2 family of ITU-T Recommendations. It specifies the revised coding of the 4.2931 2 Broadband bearer capability information element specifically to enable the identification of the ATM tr
27、ansfer capability (see Recommendation 1.371 4). 2.2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommend
28、ations and other references are subject to revision: all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly
29、 published. 11 2 ITU-T Recommendation 1.41 3 (1993), B-ISDN user-network interface. ITU-T Recommendation 4.293 1 (1995) (amended in 1997), Digital Subscriber Signalling System No. 2 - User-Network Interface (UNO layer 3 specijkation for basic caWconnection control. ITU-T Recommendation 4.2961.1 (199
30、5), Digital Subscriber Signalling System No. 2 - Additional trafic parameters: Additional signalling Capabilities to support trafic parameters for the tagging option and the sustainable cell rate parameter set. ITU-T Recommendation 1.371 (1996), Trafic control and congestion control in B-ISDN. ITU-T
31、 Recommendation 1.356 (1996), B-ISDN ATM layer cell transfer performance. ITU-T Recommendation Q.2933 (1996), Digital Subscriber Signalling System No. 2 (DSS 2) - Signalling specijkation forpame relay service. 3 4 5 6 2.3 Definitions The definitions of Annex J/Q.293 1 2 apply. In addition, this Reco
32、mmendation uses the following terms as defined in Recommendation 1.371 4: - Traffic parameter, ATM transfer capability, Deterministic Bit Rate (DBR), Statistical Bit Rate (SBR), SBR configuration 1 , SBR configuration 2, SBR configuration 3. Recommendation 4.2961.2 (06/97) 1 2.4 Abbreviations The ab
33、breviations of Annex J/Q.2931 2 apply. For the purpose of this Recommendation, the following abbreviations apply in addition: ATC ATM Transfer Capability BTC Broadband Transfer Capability DBR FR Frame relay SBR Statistical Bit Rate ATM transfer capability SBR1 SBR configuration 1 ATM transfer capabi
34、lity SBR2 SBR configuration 2 ATM transfer capability SBR3 SBR configuration 3 ATM transfer capability Deterministic Bit Rate ATM transfer capability 2.5 Description This Recommendation specifies the revision of the broadband bearer capability information element coding as specified by Recommendatio
35、n 4.293 1 2 in order to enable the identification of the ATM transfer capability (see Recommendation 1.37 1 4). 2.6 Coding requirements 2.6.1 Broadband bearer capability The purpose of the Broadband bearer capability information element is to indicate a requested broadband connection-oriented bearer
36、 service to be provided by the network. It contains only information that may be used by the network. The use of the Broadband bearer capability information element in relation to compatibility checking is described in Annex BQ.293 1 2. No default broadband bearer capability may be assumed by the ab
37、sence of this information element. The Broadband bearer capability information element will be examined by both the network and the customer equipment. The Broadband bearer capability information element is coded as shown in Figure 1 and Table 1. The maximum length of this information element is 8 o
38、ctets. 2 Recommendation Q.2961.2 (06/97) STD-ITU-T RECMN Q-27b1-2-ENGL 1777 48bZ.571 Ob41222 3bT 1 ext. Coding IE Instruction Field standard Flag Res. IE Action Indicator 011 ext. 1 Broadband Transfer Capability (BTC) O O Bearer class Spare 1 ext. 1 ext. Octet 1 2 3 4 5 5 a* 6 7* (Note) Susceptibili
39、ty O O O User plane to clipping Spare connection configuration O 1 User information Layer id layer 2 protocol NOTE - This octet shall be included when interworking with other networks providing frame relay data transfer service is required. Otherwise it is optional. Figure UQ.2961.2 - Broadband bear
40、er capability information element Recommendation 4.2961.2 (06/97) 3 Table VQ.2961.2 - Broadband bearer capability information element - Bearer class (octet 5) Bits 54321 O O O O 1 BCOB-A O O O 1 1 BCOB-C O O 1 O 1 All other values are reserved. - Broadband transfer capability (octet 5a) Values used
41、on transmission and reception (Note 1) - Broadband transfer capability (octet 5a) Bits 7654321 0000101 00001 11 DBR (Note 3) O00 1 O01 0001010 0001011 SBRl (Note 6) with end-to-end timing not required 0010011 SBRl (Note 6) with end-to-end timing required Additional values recognized on reception (No
42、te 7) - Broadband transfer capability (octet 5a) Bits 7654321 0000000 0000001 BTC9, variable bit rate with end-to-end timing required 0000010 0000100 BTC5, constant bit rate with end-to-end timing required 0000110 BTC5, constant bit rate with end-to-end timing required 0001000 fiamerelayingbearerser
43、vice 1 O O O O BCOB-X BTC5, BTC9, BTC10, constant bit rate with end-to-end timing required (Note 2) variable bit rate with end-to-end timing required (Note 4) variable bit rate with end-to-end timing not required (Note 5) BTC 1 O, BTC 10, variable bit rate with end-to-end timing not required variabl
44、e bit rate with end-to-end timing not required BTC1 O, variable bit rate with end-to-end timing not required Additional reserved values (Note 8) - Broadband transfer capability (octet 5a) Bits 7654321 x x O O O O O reserved for backward compatibility xxoooo1 reserved for backward compatibility x x O
45、 O O 1 O reserved forbackwardcompatibility x x O O 1 O O reserved for backwardcompatibility xxoo101 reserved for backward compatibility x x O O 1 1 O reserved forbackward compatibility xx01000 reserved for backward compatibility xxo1001 reserved for backward compatibility x x O 1 O 1 O reserved for
46、backwardcompatibility where: x x = “O 111, “1 o“, or “1 1“ All other values are reserved. 4 Recommendation Q.2961.2 (06/97) Table UQ.2961.2 - Broadband bearer capability information element (conchded) gotes relative to Table 1: JOTE 1 - The valid combinations of the BTC field values defined in this
47、Recommendation and the values ,f the bearer class field are specified in Annex A. (OTE 2 - This codepoint is defined to promote backward compatibility with the first edition of teecommendation 4.293 1 (1995). When the bearer class is coded “BCOB-A“, this octet shall only be present f the BTC field h
48、as a coding other than “constant bit rate with end-to-end timing required“. qOTE 3 - DBR is specified in Recommendation 1.371 3. qOTE 4 - This codepoint is defined to promote backward compatibility with the first edition of iecommendation 4.293 1 (1995). IOTE 5 - This codepoint is defined to promote
49、 backward compatibility with the first edition of Xecommendation 4.293 1 (1 995). When the bearer class is coded “BCOB-C“, this octet shall only present if :he BTC field has a coding other than “variable bit rate with end-to-end timing not required“. VOTE 6 - SBR1 is specified in Recommendation 1.371 4. VOTE 7 - In order to be backward compatible with the first edition of Recommendation 4.293 1 (1995) and with Recommendation 4.2933 6, these codepoints shall be recognized in combination with a bearer class field coding of
