Multiplex communications – Diagnostic testing
Reexamination Certificate
2004-05-13
2009-02-03
Rao, Seema S (Department: 2616)
Multiplex communications
Diagnostic testing
C370S242000, C370S245000, C370S254000, C370S401000, C370S908000, C370S911000, C370S912000, C709S223000, C709S224000, C714S001000, C714S025000, C714S040000
Reexamination Certificate
active
07486623
ABSTRACT:
A method for surveilling a telecommunications network link includes disposing a link demarcation device (LDD) at a point on a network link, the LLD dividing the network link into a first network link section and a second network link section, the LDD being configured to perform self-monitoring and monitoring of the first a network link sections, operating the LDD to transmit one of a plurality of unique fault-indicating signals based upon a specific detected fault-indicating condition, wherein each of the unique fault-indicating signals corresponds to a detected fault-indicating condition, detecting the unique fault-indicating signal with a link delimiting device (LLD) communicatively coupled to the LDD by one of the first and second network link sections, and unambiguously identifying the unique fault-indicating signal with the LLD, wherein the unique fault-indicating signals are selected to be readily distinguishable by an existing detection and alarming capability of the LLD.
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Cullen Larry T.
General Instrument Corporation
Rao Seema S
Wong Xavier Szewai
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