Multisite trunked RF communication system with reliable control

Details Multisite trunked RF communication system with reliable control Multisite trunked RF communication system with reliable control

1993-07-02

1994-11-15

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 581, 370 8511, 371 82, 34082501, 34082508, 455 531, H04J 314, G06F 1120

Patent

active

053655125

ABSTRACT:
A distributed switching network (switch) routes audio and control signals throughout the switch from various audio sources to one or more audio destinations. Audio sources such as mobile/portable radio units (via RF repeater transmitters), dispatch consoles, and landline telephone subscribers (via the central telephone switching network) are preassigned and routed onto an audio channel (i.e. a time slot) on a time division multiplexed (TDM) audio bus through a corresponding node. Each microprocessor controlled node is connected to plural control message buses provided for transferring control messages between nodes. A first supervisory node is physically connected at one end of the message buses and an end node is connected at the other end. If the end node fails to respond to a polling message from the supervisory node within a predetermined time period, the supervisory node assumes that the current messaging bus is faulty and initiates a bus switching operation to an alternate messaging bus. The supervisory and end nodes thereafter coordinate switching of all nodes in the switch to the alternate control messaging bus to insure reliable trunked RF communications over the multisite network.

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