Security system for a distributed control exchange

Details Security system for a distributed control exchange Security system for a distributed control exchange

1982-09-20

1985-01-08

Atkinson, Charles E.

Excavating

179 18ES, 179 18EE, G06F 1120

Patent

active

044930763

ABSTRACT:
A security system for an exchange having distributed control. Exchange control is distributed among a plurality of microprocessors and in microprocessor terminal units connected to a time-division switching network. The security system is organized on three levels: (I) a first level comprising security means in each microprocessor for detecting faults and for taking decisions concerning current processing; (II) a second level comprising means for managing said security blocks and for switching over from one block to another and re-configuring the links affected by the switchover; and (III) a third level comprising means for managing the microprocessors of the exchange control means and the two point-to-point links, said third level means comprising two identical peripheral control units controlling respective mass memories each containing a copy of the software needed to run the exchange.

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