Digital service hierarchy level 3 (DS3) application detection

Multiplex communications – Diagnostic testing

Reexamination Certificate

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Reexamination Certificate

active

07391733

ABSTRACT:
A method and apparatus for detecting the C-bit parity application of DS3 makes use of the relative state of the CP-bits and the P-bits in one or more M-frames alone or in combination with the state of the AIC signal. In one implementation, the invention is a detector circuit that is adapted to receive a CP-bit and a P-bit from each of a group of one or more M-frames of a DS3 service. For each M-frame in the group, the detector circuit performs a logical XOR between the CP-bit and the P-bit for that M-frame. The detector circuit further performs a logical OR between the XOR results from each M-frame in the group and outputs a C-bit parity format detect signal if the result is zero.

REFERENCES:
patent: 5511077 (1996-04-01), Shimada
patent: 5596715 (1997-01-01), Klein et al.
patent: 6839330 (2005-01-01), Chitre et al.

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