Multiplex communications – Diagnostic testing – Fault detection
Patent
1995-12-20
1998-02-03
Kizou, Hassan
Multiplex communications
Diagnostic testing
Fault detection
370248, 371 71, H04J 314
Patent
active
057152381
ABSTRACT:
An apparatus and method are provided for a data communications device (100), such as a modem, to detect the loss of a telecommunications channel connection, in the absence of other notification signals. The apparatus and method embodiments of the invention utilize a near end echo in full duplex transmission, and compare (630) periodically sampled transmit data (610), preferably composed of an n-bit sequence, with sampled values of received data (620), to determine the occurrence of a match between the data received and the data transmitted (640). If a predetermined number of consecutive matches have occurred (670), then a loss of a telecommunications channel connection has occurred and is detected (680). Preferrably, the apparatus is embodied in a processor (108) or a processor (107) coupled with a digital signal processor (106), which are within the data communications device (100).
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Gusler, Jr. Lee T.
Hall, Jr. Orlyn C.
Gamburd Nancy R.
Kizou Hassan
Motorola Inc.
Yao Kwang Bin
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