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11、Institute. Notice of Disclaimer Supplement to T1.630-1999) American National Standard for Telecommunications Network - Broadband ISDN - ATM Adaptation Layer for Constant Bit Rate Services Functionality and Specification Secretariat Alliance for Telecommunications Industry Solutions Approved August 8
12、 2002 American National Standards Institute, Inc. Abstract This standard defines a new AAL Type 1 format for interworking AAL Type 1 and AAL Type 2 networks. AMERICAN NATIONAL STANDARD ATIS-1000630.a.2002American National Standard for Telecommunications Network - Broadband ISDN - ATM Adaptation Lay
13、er for Constant Bit Rate Services Functionality and Specification 1 1 Introduction This supplement to American National Standard for Telecommunications, T1.630-1999, Network - Broadband ISDN - ATM Adaptation Layer for Constant Bit Rate Services, provides an extension of this document to incorporate
14、new requirements that define a new AAL Type 1 format to facilitate AAL Type 1 and AAL Type 2 interworking. 2 Add the following references to clause 2 of T1.630-1999: ITU-T Recommendation I.363.2 (2000), B-ISDN ATM Adaptation Layer Type 2 Specification.1ITU-T Recommendation I.366.2 (2000), AAL Type2
15、Service Specific Convergence Sublayer for Narrowband Services.1ITU-T Recommendation Q.2630.2 (2000), AAL Type 2 Signalling Protocol (Capability Set 2).13 Add the following abbreviations to clause 3 of T1.630-1999: A2SE AAL Type 2 Service Endpoint A21SE AAL Type 2 Service Endpoint with AAL Type 1 Int
16、erworking A2SW AAL Type 2 Switch 4 Add the following Annex to T1.630-1999: 1This document is available from the International Telecommunications Union. ATIS-1000630.a.2002 2 Annex A (normative) A Format for AAL Type 2 interworking with AAL Type 1 A.1 Scope The scope of this Annex is to define a new
17、format for AAL Type 1 to simplify interworking with ATM and AAL Type 1 core networks as shown in Figure A.1. The new format defined in this Annex is used in an AAL Type 2 service endpoint with AAL Type 1 interworking (A21SE). All other AAL Type 2 nodes, i.e. A2SE and A2SW, in Figure A.1 use the exis
18、ting in force ITU-T AAL Type 2 user-plane and signalling protocol recommendations. Figure A.1 A.1.1 Applicable CS structure for AAL Type 2 interworking with AAL Type 1 This Annex uses the CS for Structured Data Transfer (SDT) consistent with the T1.630-1999, clause 3.22 definition. A.2 Requirements
19、The Requirements of T1.630-1999, clause 5, apply to this Addendum with the following additions: The new format in this Addendum uses the non-P-format SAR-PDU payload (ITU-T Recommendation I.363.1, Figure 7a) of the (SDT) method of Recommendation I.363.1, as defined in Recommendation I.363.1, section
20、 2.5.2.3. As this format uses full fill cells for the SAR-PDU, partial filled cells as defined in Recommendation I.363.1, section 2.5.2.5, do not apply. ATIS-1000630.a.2002 3 5.1 Cell structure with active voice and no silence The structure shown in Figure A.2 provides simplified interworking betwee
21、n AAL Type 1 and AAL Type 2 for active voice with no silent channels. Cell Header 5 octets SAR-PDU Header 1 0ctet CID 1 octet LI UUI HEC 2 octets AAL User Information 40 octets PAD 4 0ctets Figure A.2 SAR-PDU header (see I.363.1 section 2.4.2) CID (8 bits) LI, Length Indicator (6 bits) UUI, User-to-
22、User Indication (5 bits) HEC, Header Error Control (5 bits) PAD = all zeros (0000.0000) 5.2 Cell structure with active voice and silence The structure shown in Figure A.3 provides simplified interworking between AAL Type 1 and AAL Type 2 for active voice with silent channels. Cell Header 5 octets SA
23、R-PDU Header 1 0ctet CID 1 octet LI UUI HEC 2 octets AAL User Information 40 octets CID 1 octet LI UUI HEC 2 octets SID 1 octet Figure A.3 SID = Generic SID as defined in Recommendation I.366.2, Annex I. 5.3 Cell structure with no active voice and no silence. The structure shown in Figure A.4 provid
24、es simplified interworking between AAL Type 1 and AAL Type 2 for no active voice and with no silent channels. Cell Header 5 octets SAR-PDU Header 1 0ctet CID 1 octet (00000000) Idle voice and silence cell 46 octets Figure A.4 5.4 Cell structure with no active voice and active silence. The structure
25、shown in Figure A.5 provides simplified interworking between AAL Type 1 and AAL Type 2 for no active voice and with active silent channels. ATIS-1000630.a.2002 4 Cell Header 5 octets SAR-PDU Header 1 0ctet CID 1 octet (00000000) Idle voice cell 40 octets CID 1 octet LI UUI HEC 2 octets SID 1 octet F
26、igure A.5 5.5 Channel Identifier (CID) The format of the channel identifier shall be as per Figure A.6. CID Value Use 0 Idle 1 7 Reserved 8 255 Identification of individual AAL Type 1 channel Figure A.6 5.6 AAL user information The encoding formats for the AAL user information for AAL Type 2 interwo
27、rking with AAL Type 1 shall use the following encoding formats: 1. The narrowband service of 3.1 kHz voice shall use the analog encoding format for PCM at 64 kbit/s as defined in Annex B of Recommendation I.366.2. 2. The narrowband service of 64 kbit/s unrestricted shall use the encoding format for circuit mode data with N = 1 as defined in Annex J of Recommendation I.366.2.
