ITU-T Q 940-1988 ISDN User-Network Interface Protocol for Management - General Aspects - Digital Subscriber Signalling System No 1 (DSS 1) Network Layer User-Network Management (St.pdf
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1、CCITT FASCICLE VI.33 88 4862573 0507084 b SECTION 2 USER-NETWORK MANAGEMENT Recommendation Q.940 ISDN USER-NETWORK INTERFACE PROTOCOL FOR MANAGEMENT - GENERAL ASPECTS 1 General This Recommendation is one of a proposed series of Recommendations describing the management model, service elements and pr
2、otocol to be provided at the ISDN user-network interface. These Recommendations also specify the management functions required to support the ISDN subscriber installation. This Recommendation describes the Management Architecture and provides a general overview of the management services and functio
3、ns. Other Recommendations in this series will specify the System Management Service Elements and Protocol and the procedures associated with management functions. The management functions provided at the user-network interface have, as an objective, full alignment with the network management functio
4、ns being addressed by the Telecommunications Management Network (TMN) and the Management Framework for Open System Interconnection (OSI). While the TMN defines management functions from a network perspective, this Recommendation describes the management functions from the subscriber perspective and
5、provides for remote user management functions. 1.1 Scope This series of Recommendations will provide for a common approach for management communications to support procedures used by a remote maintenance centre, internal or external to the network and those initiated locally. These Recommendations d
6、eal with the specification of the following items: a) b) c) d) e) f) the specification of a Management Architecture and identification of communications paths; the specification of management functionality to be provided at the ISDN user-network interface; the specification of an information exchang
7、e protocol for the exchange of management information between two peer system management application entities (SMAE); the specification of primitives between the Management Application process (user) and the SMAE (Le., the primitives at the systems management service interface (SMSI); the specificat
8、ion of service primitives between the SMAE service element and the next lower layer service elements (Le., primitives at the presentation layer service access point (PSAP); the specification of a convergence function that may be required to permit the direct access of the SMAE service elements to se
9、rvices provided by layer 3 e., the primitives at the network layer service access point (NSAP). 1.2 Field of application The protocols and procedures described in these Recommendations provide the means to support management functions at the ISDN user-network interface. Management activities that ma
10、nage network services, operations such as network resource configuration, routing information and maintenance activities shall be 425 Fascicle VI.11 - Rec. Q.940 Y 7 - - Previous page is blank CCITT FASCICLE VI.33 88 m 4862593 0507085 8 m! supported by the functions and protocols defined in these Re
11、commendations. In particular these management functions should be able to support specific requirements such as those defined in the 1.60-Series of Recommenda- tions (Subscriber Access and Installation Maintenance). These protocols make it possible to control loopbacks and diagnostic tests, initiate
12、 and terminate event reporting and to exchange management information across the ISDN user-network interface, i.e., between equipment connected to the S/T reference points. The physical layer signals in the digital transmission section which are used to control maintenance functions are outside the
13、scope of this Recommendation. The protocols can be used on the D Channel of both the basic and primary rate interface structures and across both reference points S and T. The higher layer protocols can also be used on other ISDN channels and services. The protocols and procedures described in these
14、Recommendations take into account that interactions with the TMN will occur. It is, therefore, desirable that the services and protocols to be used to support access management are aligned, wherever possible, with those to be defined for the TMN and OS1 management. 2 Categories of management informa
15、tion exchange Management information exchanges may be categorized into the following three categories: a) b) Event notification: information transfer initiated by one system reporting instantaneously the occur- rence of an event (e.g., a fault occurrence) to another system. Data transfer: informatio
16、n exchange initiated by one system in order to get management-related information from another system. These exchanges follow the “request followed by response” paradigm. Control information: information exchanges which are of an executive nature, where one system requests that an action be performe
17、d by another system (e.g., for test access and downloading of parameters). c) 3 Management functions Management functions may be classified in accordance with fields of application. The following major functions have been identified: a) Fault management - Maintenance functions - Fault tracing - Spon
18、taneous error reporting - Error threshold alarm reporting - Continuous monitoring - Diagnostic testing - Resource (re)initialization - Confidence testing - Resource identification - Trouble isolation. b) Configuration management - Routing changes - Data base changes - Equipment identification - Netw
19、ork/equipment reconfiguration. - Reporting of billing data. c) Accounting management d) Performance management - - Performance monitoring - Applying controls. Collecting and reporting of traffic data e) Security management. f - 426 Fascicle VI.ll - Rec. 4.940 *-I _? CCITT FASCICLE VI-LL 88 48b259L 0
20、50708b T = 4 Management reference models 4.1 Communications path model Figure /Q.940 shows the entities which may contain System Management Entities (SME) which may require capability to communicate. System Management Entities may be located in, the local exchanges, subscriber installations, remote
21、management centres or network management centres. The management functions supported by the various systems may differ depending on system requirements and may vary between different networks. However, the communications facilities provided by the systems management entities should be as common as p
22、ossible. The scope of this Recommendation covers those functions and protocols that have immediate impact on the user-network interface. The system management entities may be in a TE, NT2 or management service provider. Although communication between any two management entities may be possible in th
23、e model, it does not imply that information held at a particular management entity is available to all other management entities. Security mechanisms may be used to restrict access to the information. . - Optional communication paths in the network FIGURE 1/Q.940 Management communication model Fasci
24、cle VI.ll - Rec. 4.940 ri - -, 427 CCITT FASCICLE VI.33 88 4862573 0507087 3 D Figure 1/Q.940 shows that three types of management communications can be accommodated: a) TE (or Remote Management Centre) - TE (1 -2); b) TE - Network Management Function (1 - 3); c) TE - Network Management Function - T
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