Communication and exchange processing system

Details Communication and exchange processing system Communication and exchange processing system

1992-11-30

1995-08-22

Canney, Vincent P.

Excavating

G06F 1100

Patent

active

054447143

ABSTRACT:
A method for reducing the occurrence of a system-down phenomenon due to a communication clock trouble in a communication/exchange processing system, where possible, is described. In a communication/exchange processing system comprising a plurality of reference communication clock generators, a plurality of clock modules for selectively receiving one of the plurality of reference communication clocks to generate various application communication clocks (only one of which is active at a time), a multi-line interfacer for performing a connection processing with each node on a network, a communication processor for performing communication/exchange control operations, and a switching module for performing a switching operation via software according to channels, a clock control method comprises the steps of polling status ports of the clock modules to determine whether there is clock trouble, determining whether there is an alternative reference communication clock in an active clock module when clock trouble occurs, changing an input reference communication clock, when an alternative reference communication clock exists in an active clock module, determining whether there is a standby clock module, when there is no alternative reference communication clock in an active clock module and shutting the system down in the absence of a standby clock module, and activating a standby clock module and repeating the above steps in the presence of a standby clock module. The present method can improve the reliability of a communication network.

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