SECTION 4 - Operations, maintenance and administration part (OMAP)

Contents of Recommendation Q.795

Page

Recommendation Q.795 - Operations, Maintenance and Administration Part (OMAP)

1. Introduction ....................................................... 32

2. Operations, maintenance and administration procedures for the

signalling network ................................................. 35

3. Operations and maintenance procedures for the exchanges ............ 45

4. Operations and maintenance procedures for both the signalling

network and exchanges .............................................. 46

5. Requirements on the protocols used to support the operations

and maintenance procedures ......................................... 46

6. Timer definitions and values, and performance time definitions

and values ......................................................... 47

7. State transition diagrams .......................................... 47

8. ASEs ............................................................... 52

ANNEX A - Example MRVT message as delivered to the SCCP ................. 65

ANNEX B - SCCP Routing Verification Test (SRVT) ......................... 70

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SECTION 4

OPERATIONS, MAINTENANCE AND ADMINISTRATION PART (OMAP)

Recommendation Q.795

OPERATIONS, MAINTENANCE AND ADMINISTRATION PART (OMAP)

1.	Introduction

The purpose of this Recommendation is to provide procedures and protocols related to operations and maintenance information. These procedures and protocols are associated with the application layer of the Open Systems Interconnection model, as well as the System Management Application Process (SMAP) residing above the application layer. In addition, the procedures and protocols related to operations and maintenance information use other procedures and protocols specified by CCITT in the framework of the OSI model 1.

The operations and maintenance procedures described are generally associated with two types of signalling points. The controlled signalling point(s) are the signalling point(s) to which controls are applied and about which information is collected. The controlling signalling point(s) are the signalling point(s) which are initiating the controls and to which information from the controlled signalling point(s) are directed.

This Recommendation is divided into eight sections. The first, is the introduction. The second describes those procedures in OMAP which are currently defined for the signalling network. The third describes those operations and maintenance procedures associated with the exchanges. The fourth describes those common operations and maintenance procedures that are associated with the signalling network and exchanges and the fifth section describes those capabilities required by OMAP from other layers of the OSI and gives examples of why the capabilities are required. The sixth section defines timers, timer values and performance timers. The seventh section provides state transition diagrams for the currently defined OMAP procedures. The eighth section defines the OMAP ASEs.

1.1	Description of management model

The Signalling System No. 7 Management model is concerned with the control, coordination, and monitoring of the resources which allow SS No. 7 based communication to take place. More specifically, activities relate to the way various SS No. 7 entities obtain data and cooperate in relation to maintaining these resources. Figure 1 presents a graphical description of the SS No. 7 Management model in relation to the OSI Management model.

1.2	Application layer model

The set of functions above the application layer which collectively encompass systems management is termed Systems Management Application Process (SMAP). The aspect of the SMAP which is then involved with communications is the Systems Management Application Entity (SMAE). The SMAE is also known as the

OMAP AE. The OMAP AE consists of a set of one or more Application Service Elements (ASEs). Currently, two ASEs are defined in the OMAP AE, the Transaction Capabilities Application Part (TCAP Recommendations Q.771-775), and the MTP Routing Verification Test (MRVT) (§ 8). The MRVT ASE uses the services of the TCAP ASE.

The SMAP communicates with the OMAP AE via a set of OM-Primitives at the Systems Management Service Interface (SMSI). Currently, two primitives are defined for OMAP: OM-Confirmed-Action, and OM-Event-Report. These Primitives are defined in § 8. These OM-Primitives are based on the M-Primitives used in the Common Management Information Protocol (CMIP) defined in IS0 9595/6.

1.2.1	Transfer categories

There are two categories of data transfer which are of concern to SMAP and management. These are connectionless service and a connection-oriented service.

1.2.1.1	Connectionless service

OMAP as currently defined in this Recommendation uses the services of connectionless TCAP as currently specified in Recommendations Q.771-774. This service is generally used for those functions which require only a few messages, e.g. MRVT (see § 2.1) see Figure 2/Q.795.

1.2.1.2	Connection-oriented service

OMAP as currently defined does not offer a connection-oriented service, however this is an item for further study. This service would generally be used for those functions which require a number of messages. See Figure 3.

Note that in the case of success, only a) will be present; in the cases of partial success and failure, a), b) and c) will be present.

This paragraph deals with those procedures associated with the operations and maintenance of exchanges and remains as a topic for further study. A basis for the definition of this paragraph will be

Recommendations Q.511, Q.512, Q.542 and Q.544, Supplement 6 of Fascicle II.3 and Recommendation Z.318.

The CVT response message will also contain data about the circuit with respect to the characteristics of the interexchange circuit group that it is part of. The interexchange circuit group characteristics will include whether:

-	odd or even CICs are in control in the case of double seizing;

-	the blocked circuit group is classified as "Block, immediately

release the call" or "Block, as soon as the call is normally released";

-	whether the interexchange circuit group contains analogue, digital or a mix of analogue and digital circuits in order to

determine if continuity checks should be performed.

If the group characteristics are unavailable, the CVT response must explicitly indicate this with an unavailable indication. Inconsistencies between the interexchange circuit group characteristics between the two exchanges must be reported to the initiating end maintenance personnel for corrective action.

Annex B

(to Recommendation Q.795)

SCCP Routing Verification Test (SRVT)

B.1	Introduction

This Annex describes an SCCP Routing Verification Test (SRVT). The procedure described covers the case of a single MTP network. Enhancements of this procedure are required to ensure that:

-	the procedure works for multiple MTP networks;

-	the procedure tests the change of Global Title at an SCCP

relay node;

-	the procedure is signalling network structure independent.

B.2	SRVT

The compatability of OMAP with OSI management protocols [i.e. Common Management Information Protocol (CMIP)] is for further study.