Sameer S Gupta

US Patent:

7489710, Feb 10, 2009

Filed:

Apr 22, 2003

Appl. No.:

10/420156

Inventors:

Sameer Gupta - Round Rock TX, US
Michael Samuel Shaffer - Lynnfield MA, US
Himanshu Mahendra Thaker - Austin TX, US

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

H04J 3/06

US Classification:

370516, 370235, 370507

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.

US Patent:

7801934, Sep 21, 2010

Filed:

Apr 22, 2003

Appl. No.:

10/420153

Inventors:

Sameer Gupta - Round Rock TX, US
Himanshu Mahendra Thaker - Austin TX, US

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

G06F 15/16

US Classification:

708200, 709203, 709231, 709232, 370476, 370516, 370517, 370518, 370519

Abstract:

Virtual concatenation circuitry is disclosed for implementation in a network element of a data communication network. The virtual concatenation circuitry in a preferred embodiment is operative: (i) to maintain, for each of the individual member streams of a virtual concatenation stream, a corresponding counter which tracks pointer adjustments for that member stream; and (ii) to generate pointers based on values of the counters so as to substantially equalize incoming and outgoing pointer adjustments for the member streams at the network element.