Error detection/correction and fault detection/recovery – Pulse or data error handling – Transmission facility testing
Reexamination Certificate
2005-02-25
2009-06-09
Britt, Cynthia (Department: 2117)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Transmission facility testing
C714S004110, C714S776000, C714S820000, C370S241000
Reexamination Certificate
active
07546496
ABSTRACT:
A packet transmission device that is connected to a plurality of communication lines, and transmits a packet received, includes a failure detecting unit that monitors a condition of the communication lines, and detects a failure in the communication lines; and a packet transmitting unit that transmits, when the failure detecting unit detects a failure in a communication line, and when a packet having a same transmission-destination address as an address corresponding to a port of the communication line in which the failure has been detected is received, the packet from all preset ports.
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Japan “Abstract of Uplinkfast” Cisco Systems Inc. http://www.cisco.com/japanese/warp/public/3/jp/service/manuali/sw/cat60/65scg/chapter09/09—stp—enha.shtml.
Koyanagi Toshinori
Nakai Shigetoshi
Nemoto Satoshi
Sunaga Hideo
Britt Cynthia
Fujitsu Limited
Hanify & King P.C.
Merant Guerrier
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