Method and apparatus for monitoring and switching over to a back-up bus in a redundant trainline monitor system
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United States of America Patent
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Apr 4, 1995
Issued Date -
N/A
app pub date -
Mar 10, 1993
filing date -
Mar 18, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method A and apparatus for monitoring and switching over from a primary bus to a back-up bus in a network having a master node and at least one slave node, the primary bus and the back-up bus each interconnecting the master node and the at least one slave node. The method includes periodically sending via the back-up bus from the master node to each of the slave nodes a master test packet containing a master address of the master node on the back-up bus and sending on the back-up bus from the at least one slave node to the master node and in response to receiving the master test packet, a slave test packet containing a slave address of the at least one slave node on the back-up bus. The method further includes indicating failures on the primary and back-up bus and disconnecting the primary bus from the master node and the at least one slave node and resuming communications between the master node and the at least one slave node via the back-up bus when a failure occurs on the primary bus and no failures occur on the back-up bus.
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