Multiplex communications – Duplex – Transmit/receive interaction control
Patent
1997-06-11
2000-01-04
Patel, Ajit
Multiplex communications
Duplex
Transmit/receive interaction control
370201, 279410, H04B 320, H04M 100
Patent
active
060117834
ABSTRACT:
A method and apparatus for monitoring the performance of an echo canceler within a telephone communications network is disclosed. In accordance with the method and apparatus of the present invention, an embedded echo-cancellation performance monitoring circuit comprises three separate units, namely, a test data injection unit, an echo path simulator unit, and a test data extraction unit. The test data injection unit is utilized to inject test data into a serial data stream intended for an echo canceler. The echo path simulator unit is utilized to simulate an echo path by attenuating the test data in the serial data stream and to loop the test data in the serial data stream back to the echo canceler. The test data extraction unit is utilized to extract the test data from a send-out data stream exiting from the echo canceler.
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Interrante John Alexander
Morales Tomas Perez
Crane John D.
Dillon Andrew J.
Ng Antony P.
Nguyen Brian
Nortel Networks Corporation
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