Dialogic DSI SS7MD Bedienungsanleitung PDF herunterladen (Seite 144)

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Chapter 7 Configuration Overview

The link set between the two halves of the dual Signaling Gateway is configured so that the originating and

destination point codes are identical.

Under normal circumstances, messages that have been determined for the SS7 network are routed directly

over the link set that connects to the adjacent signaling point. Under failure conditions, when the link to the

adjacent signaling point is not available, the traffic messages are sent instead on the secondary link set to

the partner Signaling Gateway. On receipt of these messages, the partner Signaling Gateway recognizes that

the message is not destined for itself and transfers the message to its network-facing link set.

The signaling that takes place between each half of the dual Signaling Gateway system makes use of two

reserved Network Indicator values in the Sub-Service Field, these values designated “National - Reserved”

and “International - Reserved” must therefore not be used for signaling either to or from the network.

The link set between the two halves of the dual pair now becomes a key element in the system, and to avoid

a single point of failure, this link set should contain at least two signaling links. Where possible, these links

should be located on different signaling boards.

7.6.2.2 Configuration

Each half of the dual configuration needs to be configured separately using existing configuration techniques

and noting the following.

The additional link set between the two Signaling Gateways should have the local point code and the

adjacent point code set to the same value.

Each route to a destination signaling point should be configured to use the network link set as the primary

link set and the inter Signaling Gateway link set as the secondary link set. Load sharing must be disabled.

When connecting to a pair of adjacent STPs, each STP must have a route declared on each Signaling

Gateway and in all cases the inter-Signaling Gateway link set must be specified as the secondary link set.

A route must be configured to the other half of the dual Signaling Gateway system, this must use the inter-

Signaling Gateway link set as the only link set.

In addition, the link set between the two halves of the dual Signaling Gateway system must be designated as

a “special” link set. The method of achieving this depends on the equipment and configuration tools in use as

follows:

Use the C7LSI command to initiate a link set with the same values for the OPC and DPC parameters and the

value of the DUAL parameter set to zero.

7.6.2.3 M2PA Inter Unit Signaling Links

The Signaling Gateway supports the use of M2PA SIGTRAN links for inter Signaling Gateway communication.

M2PA SS7 links use the SCTP IP protocol to transmit signaling data. The use of IP links between the units

(rather than TDM SS7 links) allows the systems to be able to present a greater number of TDM links and

PCMs to face the SS7 network. In addition, since the Signaling Gateway supports two IP ports and M2PA

supports IP multihoming, resilience between the units can be gained using redundant IP networks rather

than the two SS7 boards that would be required to offer the same level of resilience.

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Dialogic DSI SS7MD Bedienungsanleitung Seite 144