NEC 2000 IPS manual Shared Trunk Facilities and Alternate Routing

Chapter 14 Common Channel Inter-Office Signaling (CCIS)

Shared Trunk Facilities and Alternate Routing

Many network applications dictate a need to strategically distribute trunk facilities throughout the network. The practice of sharing trunk facilities across a network is beneficial because it reduces the overall network trunking requirements and provides additional lower cost route choices. When combining this practice with the Alternate Routing capabilities of CCIS, a large increase in network reliability and user productivity can be realized while reducing network operations costs.

The flexibility surrounding CCIS allows multiple alternate routing schemes, which can be created to enhance network reliability while they are specifically designed to consider Least Cost Routing (LCR) benefits. This provides the user with multiple alternate routes that are automatically selected with call costs as the primary factor in route selection. As shown in the following diagram, CCIS intelligence will also automatically use the pre-configured alternate route for the D channel (if configured for link redundancy) in the event that the primary D channel route is disabled.

Alternate Routing

LINK FAILURE

VOICE/DATA

NETWORK

ALTERNATE ROUTE

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