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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
*
* *
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.