Mtp3 Signaling Network Management

The purpose of MTP3 signaling network management is to keep the signaling message traffic flowing under abnormal (congestion, failure) conditions in the signaling network. Some of these conditions may require a temporary reduction—or suspension—of outgoing message traffic to certain destinations. In these cases, SNM alerts the level-4 protocols at its signaling point [8,10].

8.9.1 Structure and Interfaces of SNM

SNM consists of three parts—see Fig. 8.9-1.

SNM Link Management. This monitors and controls the status of the individual MTP2s (signaling links) of the signaling point.

SNM Route Management. This communicates with its "peer" functions at other signaling points, sending and receiving information regarding the status of signaling routes to individual destinations.

SNM Traffic Management. This receives information from SNM link management on the status (available/unavailable) of the signaling links at its signaling point, and information from SNM route management about problems on the signaling route sets to particular destinations. When necessary, it informs SMH message routing and the MTP-users at its signaling point.

Some SNM procedures involve more than one part of SNM and require communications between these parts.

Interfaces of SNM. SNM has interfaces with the MTP-users (level-4 protocols), the MTP2s of the signaling links, and the SMH message routing function at its

MTP-users _MTP3_ Signaling Links

MTP-users _MTP3_ Signaling Links

-----► Control Paths within Signaling Point

-► Paths for Messages to/from other Signaling Points

Figure 8.9-1. Structure and interfaces of signaling network management (SNM). (From Rec. Q.704. Courtesy of ITU-T.)

-----► Control Paths within Signaling Point

-► Paths for Messages to/from other Signaling Points

Figure 8.9-1. Structure and interfaces of signaling network management (SNM). (From Rec. Q.704. Courtesy of ITU-T.)

signaling point. It also communicates with SNMs at other signaling points, sending and receiving SNM messages.

Inputs. SNM bases its actions on the following inputs (the numbers below correspond to the numbers in Fig. 8.9-1):

1. Indications on the status of the signaling links at its signaling point, received from the MTP2s.

2. SNM messages received from the SNM functions at other signaling points. Outputs. The actions of SNM result in the outputs listed below:

3. Commands to the MTP2s of the signaling links.

4. Commands to the SMH message routing function at its signaling point: for example, to divert signaling messages to a certain destination from their normal signaling link to an alternative link.

5. Indications (primitives) to the MTP-users at its signaling point, about the status of signaling route sets to individual destinations (Fig. 8.7-1). MTP-status, MTP-pause, and MTP-resume indicate that the signaling route set to a particular destination has become congested, unavailable, and available again.

6. Messages to SNMs at other signaling points.

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