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Switch identifiers designate, for each networked trunk, the system connected at the other end of the that trunk. The System Manager must program switch identifiers to assure proper volume levels on private network trunks and to allow proper routing for calls across the network.
The correct switch identifier for a trunk or block of trunks is determined by the type of switch to which the trunk is connected and whether or not that switch is a satellite switch (located within 200 miles of the local system). It is important to know the distance between systems in order to assure transmission quality. The identifiers are switch numbers that have the following meanings:
A switch identifier should be unique across a network. This helps avoid a situation called automatic immediate cycling. For example, when the switch identifiers for the incoming trunks and the automatically selected outgoing trunks for a call match indicating the tandem call would return to the originating switch, another route for the call is selected if possible. If all available routes specify systems with matching switch identifiers, however, the caller hears a fast-busy tone. The call is routed to the destination system and then back to the originating system in a continuous loop, until all available trunks are used.
Once switch identifiers are assigned, the system can be set up for proper routing among networked systems. The next topic provides general descriptions of the steps involved.
