Multiplex communications – Wide area network – Packet switching
Patent
1994-03-21
1996-02-27
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 8512, 371 201, H04L 122
Patent
active
054954720
ABSTRACT:
A path select switching unit is installed in network elements that are interconnected to make up a ring network. A path select switching unit has a path protection switched ring mode in which a first cross-connect uses a working path and a protection path which are counter-rotating paths set up on a line in the network. A re-use mode is also provided in which a second cross-connect is adapted for re-use of the protection path as a second working path for a different signal on that line. The path select switching unit in each network element detects a failure in the working path and, when a failure occurs, switches from the second cross-connect to the first cross-connect so as to force the path protection switched ring mode to be established, allowing data transmission over the protection path on the line.
REFERENCES:
patent: 4648088 (1987-03-01), Cagle et al.
patent: 5003531 (1991-03-01), Farinholt
patent: 5150356 (1992-09-01), Tsutsui
patent: 5241534 (1993-08-01), Omuro et al.
patent: 5329520 (1994-07-01), Richardson
International Publication No. WO 93/00756, published Jan. 7, 1993.
International Publication No. WO 92/04787, published Mar. 19, 1992.
Fujitsu Limited
Safourek Benedict V.
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