Excavating
Patent
1982-06-11
1984-08-14
Brown, Thomas W.
Excavating
179 18EE, G06F 1120, H04M 308
Patent
active
044660987
ABSTRACT:
An electronic system, such as a telephone exchange, including at least two, redundant computers. One computer is operated in the active mode while one or more are maintained in a hot "standby mode" in readiness to take over the tasks of the active computer if this computer should fail. At least one "cross channel circuit" is provided for updating the memory of the standby computer(s) in accordance with changes made in the contents of the memory of the active computer. The cross channel circuit changes the contents of the memory of the standby computer only at addresses which are within a prescribed, contiguous range of addresses.
REFERENCES:
patent: 4358823 (1982-11-01), McDonald et al.
patent: 4371754 (1983-02-01), De et al.
Brown Thomas W.
Milde Jr. Karl F.
Rodau Andrew G.
Siemens Corporation
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