Multiplex communications – Diagnostic testing – Loopback
Reexamination Certificate
2007-12-13
2011-12-27
Nguyen, Hanh (Department: 2473)
Multiplex communications
Diagnostic testing
Loopback
C370S222000
Reexamination Certificate
active
08085676
ABSTRACT:
A resilient virtual Ethernet ring has nodes interconnected by working and protection paths. If a span fails, the two nodes immediately on either side of the failure are cross-connected to fold the ring. Working-path traffic is cross-connected onto the protection path at the first of the two nodes and is then cross-connected back onto the working path at the second of the two nodes so that traffic always ingresses and egresses the ring from the working path. A traffic originating node, upon determining that transmitted packets are being looped back due to a fault on a primary path, is adapted to switch transmission of data packets from the primary path to a secondary path.
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Allan David I.
Bragg Nigel L.
Holness Marc
Skalecki Darek
Swinkels Gerard L.
Christopher & Weisberg P.A.
Nguyen Hanh
Nortel Networks Limited
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