Patent
1975-07-03
1976-11-30
Brown, Thomas W.
179 18ES, H04J 302
Patent
active
039951189
ABSTRACT:
A stored program controlled time division telephone switching system is disclosed in which apparatus is provided for permitting the main processor to cope with the after-effects of a main memory unit failure. Upon detecting that the memory unit has been restored to operation (but not necessarily its information content) the processor executes a sequence of operations to interrogate the time division network to ascertain the identity of stable calls in progress. A scratch pad memory is employed to accrue a count of which time slots have at least two ports assigned thereto. These are stable calls. Thereafter the main memory is accessed using the port numbers from the scratch pad to write idle progress marks in the main memory progress mark registers for calls having less than two ports assigned and special progress marks for other existing calls. The processor may then perform minimal processing for these existing calls in order to avoid real-time overload during recovery when the processor must also handle new calls and perform maintenance processing as well.
REFERENCES:
patent: 3042752 (1962-07-01), Fulmer
patent: 3908092 (1975-09-01), Hight et al.
patent: 3920977 (1975-11-01), Karsas
Bell Telephone Laboratories Incorporated
Brown Thomas W.
Popper Howard R.
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