Stored program controlled switching system
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United States of America Patent
Stats
-
Jun 8, 2004
Grant Date -
Jul 5, 2001
app pub date -
Feb 1, 2001
filing date -
Feb 1, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A stored program controlled switching system is comprised of a first set of detachably mounted nonvolatile semiconductor memory devices such as memory cards for respectively storing data of different types including a control program, a second set of detachably mounted nonvolatile semiconductor memory devices for respectively storing the data of different types. A first controller is provided for operating the first set of memory devices in a working mode and the second set of memory devices in a standby mode, copying data from the memory devices of the working mode into a main memory and further into the memory devices of the standby mode, and performing a switchover between the operating modes when trouble occurs in the first set of memory devices. A second controller operates the switching system according to the data stored in the main memory.
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