Self-healing meshed network using logical ring structures

Details Self-healing meshed network using logical ring structures Self-healing meshed network using logical ring structures

H - Electricity

04

J

H04J 3/02 (2006.01) H04J 3/08 (2006.01) H04J 3/16 (2006.01) H04L 12/42 (2006.01) H04L 12/437 (2006.01) H04L 12/46 (2006.01)

Patent

CA 2090428

Logical hybrid ring arrangements are disclosed which can withstand a cut communication path or a failed node. A logical ring is formed by a cascade of (i) physical hybrid ring segments (301-304), each composed of a pair of unidirectional communica- tion paths (e.g., 3011 and 3012) propagating multiplexed subchannels and interposed add-drop multiplexer nodes (311-319), and (ii) cross-connect nodes (320, 330) terminating the segments. Each cross-connect node routes an incoming subchannel from one segment to an outgoing subchannel on another segment. Each segment may operate at a different multiplexed signal rate, so a logical ring can be composed of segments operating at different rates. Moreover, subchannels on an incoming segment may be allocated to a plurality of outgoing segments, thereby configuring multiple logical rings which may serve to balance communica- tion traffic over the logical rings.

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