Stall need detection and associated stall mechanism for...

Details Stall need detection and associated stall mechanism for... Stall need detection and associated stall mechanism for...

2003-04-22

2009-02-10

Pham, Chi H. (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S235000, C370S507000

Reexamination Certificate

active

07489710

ABSTRACT:
Virtual concatenation circuitry is disclosed which provides stall need detection and an associated stall mechanism in a network element of a data communication network. The virtual concatenation circuitry in a preferred embodiment is operative to provide differential delay compensation for one or more member streams of a virtual concatenation stream. The differential delay compensation involves introducing delay into at least one of the member streams. The stall need detection aspect of the invention relates to detecting a condition under which introduction of the delay is required for alignment of member streams, for example, upon addition of a member stream to the virtual concatenation stream. Such a condition may arise, for example, if a transmission delay of an added stream is larger than that of all other member streams of the virtual concatenation stream. The stall implementation ensures that, during at least a portion of the introduced delay for a given member stream, data transmitted for that member stream is marked as invalid, thereby preventing the introduction of data errors.

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