1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0900105.04.1995(R2010) Synchronous Optical Network (SONET) Data Communication Channel Protocols and Architectures ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market
2、-driven standards for the information, entertainment and communications industry. More than 250 companies actively formulate standards in ATIS 20 Committees, covering issues including: IPTV, Service Oriented Networks, Home Networking, Energy Efficiency, IP-Based and Wireless Technologies, Quality of
3、 Service, Billing and Operational Support. In addition, numerous Incubators, Focus and Exploratory Groups address emerging industry priorities including “Green”, IP Downloadable Security, Next Generation Carrier Interconnect, IPv6 and Convergence. ATIS is the North American Organizational Partner fo
4、r the 3rd Generation Partnership Project (3GPP), a member and major U.S. contributor to the International Telecommunication Union (ITU) Radio and Telecommunications Sectors, and a member of the Inter-American Telecommunication Commission (CITEL). For more information, please visit . AMERICAN NATIONA
5、L STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial a
6、greement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use
7、of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National
8、 Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Inst
9、itute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require th
10、at action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer other (compatible) protocols for different
11、applications, e.g., Software Download, should be defined in other standards. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were vali
12、d. All standards and publications are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards and publications listed below. ANSI T1.105-1995, Telecommunications Synchr
13、onous optical network (SONET) Basic description including multiplex structure, rates, and formats ANSI T1.119-1995, Telecommunications Synchronous optical network (SONET) Operations, administration, maintenance and provisioning OAM b) In the QoS parameter, bits 7 and 8 set to 1 (globally unique QoS)
14、 and bit 1 set to 1 shall select AITS; c) In the QoS parameter, bits 7 and 8 set to 1 (globally unique QoS) and bit 1 set to 0 shall select UITS; d) The use of QoS parameter bits 2, 3, 4, 5, and 6 are not the subject of, or specified in, this Recommendation. The criteria for selecting AITS or UITS i
15、s the network providers responsibility. 7.3.4 Transport layer protocol specification The required transport layer protocol shall be class 4 operation, as specified in 6.2.2 of ANSI T1.204. 7.3.5 Session layer protocol specification The session layer shall be as specified in clause 5 of T1.208. 7.3.6
16、 Presentation layer protocol specification The presentation layer shall be as specified in clause 6 of ANSI T1.208. 7.3.7 Application layer protocol specification The application layer shall be as specified in clause 7 of T1.208. ATIS-0900105.04.1995 12 Table 3 AITS specifications a) Assignment of u
17、ser-side/network-side roles, and hence the C/R bit value, shall be made prior to initialization. b) The default value for (k)7 c) The default value for T2000.2 second d) The default value for T20310 seconds NOTE This parameter is used with the optional proced-ures listed as item (f) below. e) The de
18、fault value for N2003 f) Data link monitor functions as specified in ITU-T Recommendation Q.921 are optional. g) negotiation as described in Appendix IV of ITU-T Recommend-ation Q.921 may be used to select alternative parameter values. 7.4 Interworking for the SONET management network The Section an
19、d Line DCCs will use the seven-layer, OSI protocol stack that is specified in this standard and includes the Connectionless-Mode Network Protocol (CLNP) that is specified in ISO 8473. For the purpose of this standard, the communications on the DCN between the OS and entry point(s) to the SMN shall u
20、se an OSI protocol stack that is specified in ANSI T1.204 and ANSI T1.208, and may include protocols such as the X.25 Connection-Mode Network Protocol (CONP) specified in ISO 8208, or the 802.3 LAN protocol specified in ISO 8802-3, or both. The OSI architecture describes the view that interworking b
21、etween subnetworks, such as the SMN and an X.25 DCN, should take place within the Network Layer, with the Transport and higher Layers operating strictly on a peer-to-peer basis between end systems (LTE/STE and OS). ISO 7498 specifies that the Network Layer will provide the transparent data transfer
22、between transport-entities, i.e., end systems, that is independent of the characteristics, other than quality of service, of different subnetworks. This is identified as the routing and relaying function in the Network Layer. ISO 8648, specifies the OSI principles of interworking within sublayers of
23、 the Network Layer. 7.4.1 Interworking between the SMN and DCN Because approved ISO and/or ITU-T standards are not yet available, interworking between the SMNs, CLNP, and DCNs CONP OSI protocol stacks is a network providers responsibility. For interworking between SMNs, CLNP OSI-based Network Layer
24、Relay (NLR) shall be used. The principles of network layer interworking are described in ISO 8648. 7.4.2 Interworking between the Section and Line DCC Because the Section and Line DCCs will utilize the same seven-layer OSI protocol stack specified in this standard, interworking between the Section a
25、nd Line DCCs is a local matter, i.e., not subject to standardization. ATIS-0900105.04.1995 13 Fig 2. Example communications path for OS manager to NE agent messagesFigure 1 Management network organization model Figure 2 Example communications path for OS manager to NE agent messagesATIS-0900105.04.1
26、995 14 Figure 3 Data communication channel usageATIS-0900105.04.1995 15 Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer SECTION & LINE DCC ITU Q.921 ISO 8473/ISO 9542 ISO 8073/8073 ADD 2 X.215/X.225 ASN.1 Basic Encoding Rules: X.209 X.2
27、16/X.226 CMISE-ISO 9595/9596 ROSE: X.219/X.229 ACSE-X.217/X.227 application specific service elements for OAM&P application Lower Layer Protocols Upper Layer Protocols Figure 4 SONET DCC protocol stackATIS-0900105.04.1995 16 Figure 3. Data Communications channel usageOS Operations SystemSMN SONET Ma
28、nagement NetworkSTE Section Terminating EquipmentDCNAnnex A (informative) Bibliography ITU-T Recommendation X.200, Reference model of open systems interconnection for ITU-T applications2)ITU-T Recommendation X.208, Specification of abstract notation one2)ITU-T Recommendation X.209, Basic encoding ru
29、les for abstract notation one2)ITU-T Recommendation X.215, Session service definition for open systems interconnection for ITU-T applications2)ITU-T Recommendation X.216, Presentation service definition for open systems interconnection for ITU-T applications2)ITU-T Recommendation X.217, Association
30、control service definition for open systems interconnection for ITU-T applications2)ITU-T Recommendation X.219, Remote operations: Model, notation and service definition2)ITU-T Recommendation X.225, Session protocol specification for open systems interconnection for ITU-T applications2)ITU-T Recomme
31、ndation X.226, Presentation protocol specification for open systems interconnection for ITU-T applications2)ITU-T Recommendation X.227, Association control protocol specification for open systems interconnection for ITU-T applications2)ITU-T Recommendation X.229, Remote operations: Protocol specific
32、ation2)ISO/IEC 8802-3/ANSI/IEEE 802.3-1990, Information processing systems Local area networks Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications2)ISO/IEC 9545: 1989, Information technology Open systems interconnection Application
33、 layer structure (ALS)2)ISO/IEC 9595: 1991, Information technology Open systems interconnection Common management information service element (CMISE)2)ISO/IEC 9596: 1991, Information technology Open systems interconnection Common management information protocol (CMIP)2)ISO/IEC TR 10172: 1990, Information processing systems Data communications Network/transport protocol interworking specification2)
