Multiplex communications – Fault recovery
Reexamination Certificate
2004-12-21
2009-08-11
Ngo, Ricky (Department: 2416)
Multiplex communications
Fault recovery
C370S535000
Reexamination Certificate
active
07573809
ABSTRACT:
A semi-transparent time division multiplexer/demultiplexer that transmits low rate tributaries from one location to another using a high rate aggregate connection, while preserving substantially all of the TOH and payload for each tributary signal. Transparency of the tributary TOH is accomplished by interleaving both the TOH and the Payload of each tributary into the high rate aggregate signal. Some TOH bytes may be tunneled or re-mapped into unused/undefined TOH locations in the aggregate signal to allow transparency of the TOH without corrupting the aggregate. Errors may be handled by tunneling BIP bytes into unused/undefined aggregate locations and updating the tunneled bytes with error masks calculated at each network elements. Alternatively errors may be forwarded by using an error mask generated from the tributary BIP locations and inserting the mask into the associated aggregate BIP locations. The mask in the aggregate BIP is updated with error masks calculated at each network elements.
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Meagher Kevin S.
Vaughn Michael
Westdorp James
Bernard Christopher L.
Brown Tyler S.
CIENA Corporation
Clements Bernard PLLC
Han Clemence
LandOfFree
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