Telephonic communications – Centralized switching system – Switching controlled in response to called station...
Reexamination Certificate
2006-06-06
2006-06-06
Hong, Harry S. (Department: 2642)
Telephonic communications
Centralized switching system
Switching controlled in response to called station...
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.
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patent: 5136498 (1992-08-01), McLaughlin et al.
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Brocco Matt
Filtness Andrew
Jotwani Haresh
Hong Harry S.
Siemens Communications Inc.
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