System Overview
16
Expanded Capacity
An ST-853 system can support up to 4,096 individual subscribers or
groups. In addition, most features are programmable on a per
subscriber basis, such as the mobile activity timer, telephone line
access, courtesy beep and expanded toll restriction options. Each
controller can store up to 4,500 call records. The programmable call
records feature insures only the desired types of calls are recorded.
In the subscriber database, each subscriber or group may be assigned
a different System ID. For radiotelephone applications, this provides
up to 320,000 paging code combinations for added security. This
feature also allows an ST-853 system to be programmed with
subscribers from other systems for roaming applications.
Databus Communication between Controllers
All of the ST-853 controllers at a site are connected through a serial
databus which enables the controllers to communicate. This allows the
subscriber database and all call records data to be accessed from a
single controller.
The databus is also used by the controllers to
automatically coordinate signaling when needed. If
multiple calls are placed simultaneously in an
ST-853 system, the signalling is coordinated to
prevent missed calls or split groups. If a call is
placed to an individual or group that is already
engaged in a call, the caller will receive a busy tone
indicating that a call is in progress. If the called
individual is out of range or powered off, a fast busy
tone is generated.
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