Multiplex communications – Diagnostic testing – Path check
Patent
1997-08-07
2000-10-24
Hsu, Alpus H.
Multiplex communications
Diagnostic testing
Path check
370441, 370442, 370479, 340522, G06F 1100, H04B 7216, H04B 7212
Patent
active
061377805
ABSTRACT:
A monitoring apparatus and method are provided for a communication system in which a central office communicates to at least one end unit using intermediate remote nodes. The remote node receives signals from both the central office and the end units. Each remote node can be equipped with apparatus for monitoring the integrity of paths of the communication system. The monitoring apparatus can include a mixing device that mixes received signals to produce combined signals. The received signals generally include a pilot signal sent from the central office and a data signal sent from the at least one end unit. The state of the communication system is analyzed based on the combined signals. If the combined signals includes only the data signal from the end unit, the path through which the pilot signal was sent is inoperative. If the combined signals includes only the pilot signal, the transmission path from the end unit over which the data signal is sent is inoperative. If the combined signals are not received at the central office after transmission of the pilot signal, a determination is made that any part of transmission path could be inoperative.
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Digital and Analog Communication Systems, by K. Sam Shanmugam. pp. 301-304, 1979.
Darcie Thomas Edward
Gnauck Alan H.
Lu Xiaolin
AT&T Corp
Hsu Alpus H.
Qureshi Afsar M.
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