Method for operating and apparatus for a back-plane...

Telephonic communications – Centralized switching system – Switching controlled in response to called station...

Reexamination Certificate

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Details

C700S003000, C700S082000, C714S011000

Reexamination Certificate

active

07058170

ABSTRACT:
The present invention provides clear and robust arbitration of which of two system controllers is in control of a telecommunications switching system. Each system controller monitors and actively reports its status to a separate arbitration circuit. The resultant signal from the arbitration circuit tells the system which controller to obey. By feedback of its own output unnecessary switching or ill-defined control states are avoided. In particular, if either both or neither system controllers is reporting itself as OK, the system does not switch controllers. In addition, the arbitration circuit is fed redundant clock signals and support, making it effectively redundant.

REFERENCES:
patent: 4371754 (1983-02-01), De et al.
patent: 4466098 (1984-08-01), Southard
patent: 4633039 (1986-12-01), Holden
patent: 4912698 (1990-03-01), Bitzinger et al.
patent: 5136498 (1992-08-01), McLaughlin et al.
patent: 6308286 (2001-10-01), Richmond et al.

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