Node and method of setting backup path

Details Node and method of setting backup path Node and method of setting backup path

2007-04-20

2009-12-15

Trost, IV, William (Department: 2416)

Multiplex communications

Fault recovery

Bypass an inoperative station

C398S003000, C398S004000

Reexamination Certificate

active

07633857

ABSTRACT:
A node in a first ring stores therein connection information about connecting nodes between a second ring and a third ring. Upon receiving a route of a working path by a signaling, the node determines any one of nodes composing the second ring as a branch node. If the working path is not terminated on an end node that the working path ends in the second ring thereon, and also if no node composing the second ring stores therein connection information between the end node and any one of the connecting nodes in the third ring that is connected to the second ring, the node compares each condition of selectable routes of a backup path between the end node and the branch node, and selects any one of the selectable routes as the backup path based on a result of comparison.

REFERENCES:
patent: 5440540 (1995-08-01), Kremer
patent: 7545735 (2009-06-01), Shabtay et al.
patent: 2003/0058789 (2003-03-01), Sugawara et al.
patent: 2003-101558 (2003-04-01), None
patent: 2005-260708 (2005-09-01), None

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