Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
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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Kalapatapu Ramana
Semaan Ghassan
Bernard Christopher L.
Brown Tyler S.
Ciena Corporation
Clements Bernard PLLC
Ng Christine
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