Providing embedded protection in a network cross-connect...

Details Providing embedded protection in a network cross-connect... Providing embedded protection in a network cross-connect...

2001-09-10

2009-12-15

Ngo, Ricky (Department: 2416)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S245000

Reexamination Certificate

active

07633858

ABSTRACT:
A system and method for providing embedded UPSR protection for SONET networks is described. The STS channels for working and protection rings of a SONET network are input to a SONET overhead processor. The overhead processor comprises a monitor circuit for each standby and working ring. The monitor circuits monitor their respective input STS channels and detect any defined error conditions and/or defined operator commands or anomaly conditions. An unused overhead portion of the input STS channel is dedicated for encoding a binary value representing an error or command condition. In the event of an error or command condition, the highest value is encoded in the dedicated portion of the STS channel. The output from each monitor circuit is input into a comparator circuit of a cross-connect circuit coupled to the overhead processor. The comparator circuit selects the STS channel with the lowest encoded defect or command condition value and outputs this STS channel as data traffic to downstream network devices.

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