1、INTERNATIONAL TELECOMMUNICATION UNION lTU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2630.1 (1 211 999) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - Common aspects of B-ISDN application protocols for access signalling and network si g na I I i n g and i n te mo r ki ng AAL type 2 sig
2、nalling protocol - Capability set 1 ITU-T Recommendation Q.2630. I (Formerly CCITT Recommendation) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesSTD-ITU-T RECMN d-Zb30.1-ENGL 1777 H 48b257L Ob85b13 242 H IT11-T Q-SERIES RECOMMEAI). I
3、IOLS SWITCHIIVG AND SIGNAl,I.I; SICiNALLING 1N THE INTERNAlIONAL MANUAL SERVICE INIXRNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKI( i FLINCTIONS AND INFORMATION FLOWS FOR SERVICES IN TI Il 1SI)S CL.4USES APPLICABLE TO IIU-T STANDARD SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFIC
4、ATIONS OF SIGNALLING SYSTEM No. 6 SPEClFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DI(1TAL EXCHANGES INTERWORKING OF SIGNAI,I,ING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PLJRIJC LAND MOBILE NETWORK INIERWORKING WITH SA
5、TELLITE MOBILE SYSTEMS INTELI.IGENT NETWORK SlCiNALLING REQUIREMENTS AND PROTOCOLS FOR I BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Signalling network protocols 4T-2000 Common aspects of B-ISDN application protocols for access signalling and network signalling and interwor
6、king B-iSDN application protocols for the network signalling B-ISDN application protocols for access signalling Q.l-Q 3 4.4-(2.59 Q .6crieral requirements on receipt of unrecognized signalling iritniiation Procedures for the handling of the unrecognized messages or parameters . Procedures for the ha
7、ndling of rcsponscs indicating unrecogniLed in formation has been sent 8.2 Nodal fkictions . Nodal functions for AAL type 2 nodes with served user intcractioii 8.2.1 8.2.2 Nodal hnctions for AAL type 2 nodes without served user interaction . General protocol error handling 8.3.2 Outgoing protocol pr
8、ocedures 8.3.4 Maintenance protocol procedures . 8.4 List of timers 8.3 Protocol entity . . 8.3.1 8.3.3 incoming protocol procedures . Annex A . Support for non-switched scenario . A.l Introduction A.2 References A.3 Definitions A.4 Abbreviations . A.5 General framework of the AAL type 2 signalling
9、protocol . A.5.1 A.5.2 A.5.3 Interface between the AAL type 2 signalling entity and the AAL type 2 served user . Service provided by the generic signalling transport service Interface between the AAL type 2 signalling entities and layer management A.6 A.7 Forward and backward compatibility . Format
10、and coding of AAL type 2 signalling protocol A.7.1 Coding conventions for the AAL type 2 signalling protocol A.7.2 Format and coding of the AAL type 2 signalling protocol messages . A.7.3 A.7.4 Parameter specification of the AAL type 2 signalling protocol messages Procedure of the AAL type 2 signall
11、ing protocol A.8.1 Compatibility . Field specification of the AAL type 2 signalling protocol parameters . A.8 . A.8.2 Nodal functions . A.8.3 Protocol entity . A.8.4 List of timers . Appendix I . Example message sequences . I . 1 Successful establishment and release . 1.2 Unsuccessful establishment
12、Page 31 33 35 35 35 43 47 47 48 54 61 68 69 69 70 70 70 70 72 72 72 72 72 72 72 74 74 74 75 75 77 77 78 78 79 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services- STD.1TU-T REC“ d.Zbfl.l-ENGL Lqqq LiBb259l Ob85bL7 7b0 Page 1.3 Management m
13、essage sequences 80 81 1.4 Release crossoverrelease collision 1.5 Resource contention . 82 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesSTD-ITU-T RECMN Q.Zb30.L-ENGL 1,999 4Bb257L Ob85b20 482 E ITU-T Recommendation Q.2630.1 AAL type
14、2 signalling protocol - Capability set 1 1 Scope This ITU-T Recommendation describes the A.41. type 2 signalling protocol that supports the dynamic establishment and release of individual AAL type 2 point-to-point connections. It also describes the maintenance procedures, the framework of the protoc
15、ol, and the interactions between an AAL type 2 signalling protocol entity and: the signalling protocol user; layer management. a signalling transport converter; and This ITU-T Recommcndation also describes the connection states, messages, parameters, timers, local, and peer-to-peer procedures used f
16、or the control of those connections. The scope of this ITU-T Recommendation is illustrated in Figure 1-1. The AAL type 2 signalling protocol can be deployed over a range of signalling transport protocol stacks. This ITU-T Recornmendation is based on the requirements defined in ITU-T Supplement 8 21
17、“Signalling requirements for AAL type 2 link contvol cqxihility set I“. COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesAAL type 2 served user AAL type 2 served user (Notc 2) (Note 2) AAL type 2 signalling %3 This ITU-T Recommendation S
18、AP (Note 1) AAL type 2 signalling Signalling transport bmit ives S I 1 Signalling transport converter 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 c
19、urrently valid ITU-T Recommendations is regularly published. i ITU-T Recommendation 1.363.2 (1997), B-ISDN ATM Adaptation Layer (AAL) 2 3 4 Specijcation: Type 2 AAL. ITU-T Recommendation 1.36 1 (1 999), B-ISDN ATM layer speczfzcation. ITU-T Recommendation X.200 (1 994) 1 ISO/IEC 7498-1 : 1994, Infor
20、mation Technology - Open Systems Interconnection - Basic reference model: The basic model. ITU-T Recommendation X.210 (1993) I ISO/IEC 1073:1994, Information Technology - Open Systems Interconnection - Basic reference model: Conventions for the definition of OSI services. COPYRIGHT International Tel
21、ecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Recommendation X.213 ( 1 (N5) I ISOIIEC 8348: 1996, lrformation Technology Open Systems Interconnection ITU-T Recommendation Q.850 ( 1008), Usage of cause and locution in the Digital Subscriber Signalling Syst
22、em No. I und the Signalling System No. 7 ISDN User Part. ITU-T Recommendation Q.26 1 O ( I W), Usage of cause ancl location in B-ISDN user part ancl DSS2. ITU-T Recommendation 1.346.2 ( i W9), AAL type 2 service spec convergence sublayer for trunking. ITU-T Recommendation 1.366.1 ( 1098), Segmentati
23、on and Reassembly Service Speci$c Convergence Sublayer for the 11/11, ti pe 3. ITU-T Recommendation E. 164 ( I 997), The international public telecommunication numbering plan. IEEE Standard 802-1 990, /EEL Locrl Lind Metropolitan Area Networks: Overview and Architecture. ,Lc.tiiwk Service Definition
24、. Bibliography (non-normative references) ITU-T Q-series Recommendations - Supplement 8 (1 999), Technical Report TRQ.2400; Transport control signalling requirements - Signalling requirements for AAL type 2 link control capability set 1. ITU-T Recommendation Q.2 150.2 ( 1999), AAL type 2 signalling
25、trcinsport converter on SSCOP. ITU-T Recommendation Q.2 150.1 ( 1999), AAL type 2 signalling transport converter on broadband MTP. ITU-T Recommendation 4.22 1 O ( I996), Message transfer part level 3 functions and messages using the services of ITU-T Recommendation Q.2140. ITU-T Recommendation Q.2 1
26、 1 O ( 1 994), B-ISDN A TM adaption layer - Service specific connection oriented protocol (SSCOP) . ITU-T Recommendation 4.2 130 (1 994), B-ISDN signalling AT adaptation layer - Service specific coordination function for siipport of signalling at the user network intevface (SSCF at UNI). ITU-T Recom
27、mendation 4.2941.2 (1 999), Digital Subscriber Signalling System No. 2 - Generic identifier transport extensions. Definitions This Recommendation is based upon the concepts developed in ITU-T Recommendations X.200 3 and X.210 4. In addition, this Recommendation defines the following terms: 3.1 AAL t
28、ype 2 channel: A concept used in ITU-T Recommendation 1.363.2 i to describe transport of CPS-packets i associated in a common unique identifier value called CID on an ATM vcc. 3.2 AAL type 2 connection: The logical concatenation of one or more AAL type 2 links between two AAL type 2 service endpoint
29、s. COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services3.3 AAL type 2 link: The logical user plane communication facility between two adjacent AAL type 2 switching points or service endpoints. .An AAL type 2 link is designated by a single C
30、ID value. 3.4 AAL type 2 link characteristics: Information that describes the attributes of the AAL type 2 link. 3.5 AAL type 2 node: An AAL type 2 service endpoint or an AAL type 2 switch. 3.6 AAL type 2 Path: An ATM VCC between two adjacent AAL type 2 nodes. This ATM VCC can either be an SVC, SPVC
31、, or PVC. 3.7 AAL type 2 path identifier: The identi fier of the AAL type 2 path. 3.8 AAL type 2 service endpoint: A termination point of an AAL type 2 connection. 3.9 AAL type 2 served user: The user of an AAL type 2 signalling protocol. 3.10 AAL type 2 signalling protocol: Control plane functions
32、for establishing and releasing AAL type 2 connections and the maintenance functions associated with the AAL type 2 signalling. 3.11 AAL type 2 signalling transport: A facility for carrying AAL type 2 signalling messages. 3.12 AAL type 2 signalling endpoint: The termination point of an AAL type 2 sig
33、nalling transport. 3.13 AAL type 2 switch: A system capable of switching AAL type 2 connections. 3.14 ATM layer signalling: Control plane functions for establishing, clearing and maintaining ATM VCCs. 3.15 ATM VCC: The logical concatenation of one or more ATM virtual channel links between two ATM se
34、rvice endpoints. 3.16 field: Information carried in a parameter in a message. A field can have fixed or variable length data. 3.17 generic signalling transport: The function that enables an AAL type 2 signalling entity to communicate with a peer AAL type 2 signalling entity independently of the unde
35、rlying signalling transport. 3.18 link characteristics: (See AAL type 2 link characteristics.) 3.19 nodal function: The functions that provide the bridge between incoming and outgoing protocol entities, perform the routing, and keep track of the AAL type 2 path resources. 3.20 parameter: Information
36、 carried in a message. A parameter has a fixed, defined set of fields. 3.21 path identifier: See AAL type 2 path identifier. 3.22 protocol entity: The functions performed within an AAL type 2 signalling entity that relate to the exchange of AAL type 2 signalling information. 3.23 signalling associat
37、ion: A signalling capability that exists between two adjacent AAL type 2 nodes to control the AAL type 2 connections that may exist in one or more AAL type 2 paths. There may be one or more signaling associations between two adjacent AAL, type 2 nodes. 3.24 3.25 particular signalling transport to th
38、e services required by the generic signalling transport. 3.26 signalling transport: A signalling link or network that connects two AAL type 2 nodes. signalling transport converter: A function that converts the services provided by a subfield: The smallest unit of information in a field that has its
39、own functional meaning. COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services STD.1TU-T RECMN Q-Zb30.L-ENGL L979 W qAb2571 lJb85b24 028 4 Abbreviations This Recommendation uses the following abbreiativns A2EA A2P A2SU AAL ATM Adaptation Laye
40、r AESA ATM End System Address ALC ANI ATM Asynchronous Transfer Mode ATM VCC ATM Virtual Channel Connection AAL type 2 Service Endpoint Address AAL type 2 Path Identifier AAL type 2 Served User AAL type 2 Link Charactenstics Adjacent AAL type 2 Node Identifier BCD BLC BLO CAS CAU CEID CFN CID CMD CP
41、S DSAID DTMF ECF ERQ ESEA FAX FRM GST ID IEC IEEE IS0 LM LSB M MF-R 1 Binary Coded Decimal Block Confirm Message Block Request Message Channel Associated Signalling Cause Parameter AAL type 2 Connection Element Identifier ConFusioN Message Channel Identifier Circuit Mode Data (AAL type 2) Common Par
42、t Sublayer Destination Signalling Association Identifier Dual Tone Multi-Frequency Establish Confirm Message Establish Request Message Destination E. 164 Service Endpoint Address Parameter Demodulated Facsimile Data Frame Mode Data Generic Signalling Transport Identifier International Electrotechnic
43、al Commission Institute of Electrical and Electronics Engineers International Organization for Standardization Layer Management Least Significant Bit Mandatory Multi-Frequency R1 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesMF-R2 MSB
44、 MTP3b NF NSAP NSEA O OSAID OUI PVC REL RES RLC RSC SAAL SAID SAP SAR SDL SDU SPVC SSCOP sscs SSIA SSIM SSISA SSISU SSSAR STC SUGR SUT svc TCI TED UBC UBL uu Multi-Frequency R2 Most Significant Bit Message Transfer Pari level 3 using Q.2140 Nodal Function Network Service Access Point Destination NSA
45、P Service Endpoint Address Parameter Optional Originating Signalling Association Identifier (Parameter) Organizational Unique Identifier Permanent Virtual Channel Release Request Message Reset Request Message Release Confirm Message Reset Confirm Message Signalling ATM Adaptation Layer Signalling As
46、sociation Identifier Service Access Point Segmentation and Reassembly (Sublayer) Specification and Description Language Service Data Unit Soft PVC Service Specific Connection Oriented Protocol Service Specific Convergence Sublayer Service Specific Information (Audio) Parameter Service Specific Infor
47、mation (Multirate) Parameter Service Specific Information (SAR-assured) Parameter Service Specific Information (SAR-unassured) Parameter Segmentation and Reassembly Service Specific Convergence Sublayer Signalling Transport Converter Served User Generated Reference Served User Transport Switched Vir
48、tual Channel Test Connection Indication Transmission Error Detection Unblock Confirm Message Unblock Request Message User-user COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services STD-ITU-T RECMN d.Zb30.L-ENGL 1999 M 48b259L Ob85b2b 9TO vcc
49、 Virtual Channel Connection VPC Virtual Path Connection 5 The AAL type 2 signalling protocol provides the signalling capability to establish, release and maintain AAL type 2 point-to-point connections across a series of ATM VCCs that carry AAL, type2 links. These services are accessible via the AAL type 2 served user service access point The AAL type 2 signalling protocol also provides maintenance functions associated with the AAL type 2 signalling. An AAL type 2 signalling endpoint shall be able to control AAL type 2
