Communication device, communication system, and communication fault detection method
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United States of America Patent
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Nov 22, 2011
Grant Date -
Jun 4, 2009
app pub date -
Jul 23, 2008
filing date -
Nov 29, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The communication device has a frame transfer unit that executes frame transfer via the first communication link and the second communication link, a link confirmation frame sending unit, and a return link confirmation frame monitoring unit. The link confirmation frame sending unit causes the frame transfer processing unit to send a link confirmation frame for use in confirming a normal link status via the first communication link from the communication device to the counterpart communication device. The return link confirmation frame monitoring unit performs fault detection of the first and second communication links by monitoring a return link confirmation frame which is to be returned from the counterpart communication device to the communication device via the second communication link when the counterpart communication device receives the link confirmation frame via the first communication link.
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