Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
2005-12-06
2005-12-06
Phan, Man U. (Department: 2665)
Multiplex communications
Diagnostic testing
Fault detection
C370S216000, C370S503000, C370S514000
Reexamination Certificate
active
06973041
ABSTRACT:
In a data transmission network, such as SONET, a method and apparatus for the generation of a path Alarm Insertion Signal (AIS) at the output of each of a number of concatenated pointer processors in response to a failure at the input of any one of the pointer processors. Each of the pointer processors has an input, an output and a bidirectional terminal that is coupled to a common node. Each of the pointer processors includes circuitry coupled to the input, the output and the bidirectional terminal that causes a predetermined logic level to be asserted at the bidirectional terminal in response to the appearance of an error signal at its input and that causes an AIS to appear at its output in response to either an error signal at its input or the assertion of the predetermined logic level at its bidirectional terminal.
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Duschatko Douglas E.
Hall Robert A.
Quibodeaux Lane B.
Thurston Andrew J.
Campbell Stephenson Ascolese LLP
Cisco Technology Inc.
Phan Man U.
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