Multiplex communications – Fault recovery
Reexamination Certificate
2004-07-07
2010-11-02
Ngo, Ricky (Department: 2464)
Multiplex communications
Fault recovery
C370S218000, C370S256000, C370S403000, C370S258000, C370S389000
Reexamination Certificate
active
07826345
ABSTRACT:
Each span of a communication network, such as a BLSR ring, is assigned a unique span ID. When a node of the network detects a failure in a network span, the node exchanges commands, according to an automatic protection switching (APS) protocol, that request other nodes of the network to switch network traffic from a working span to a protect span. The commands specify the working span by its span ID, without necessarily specifying a source node ID or a destination node ID for the commands. The span ID occupies fewer bits in the commands than bits representing a combination of the source node ID and the destination node ID. Alternatively, the commands specify a destination node ID without a span ID or a source node ID, or the commands specify a source node ID without a span ID or a destination node ID.
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Kam Anthony C. K.
Patel Naimish
Xie Raymond Y.
Yang Tao
Ngo Ricky
Samuel Dewanda
Sycamore Networks, Inc.
Weingarten Schurgin, Gagnebin & Lebovici LLP
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