Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1995-03-30
1996-09-10
Zele, Krista M.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379398, 379414, 375232, H03H 740, H04M 308, H04M 704
Patent
active
055552854
ABSTRACT:
A multi-variate system having a microprocessor-based telecommunications interface which has a digital adaptive all-pass filter and automatically variable delay distortion equalization circuitry which in combination provide both pre and post delay distortion equalization on the transmit and receive sides of bidirectional data lines (or dedicated telephone lines), which interfaces a conventional 4-wire analog facility and a data station termination at the customer premises equipment. A method of practicing the preferred embodiment of the invention is also disclosed.
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AT&T Bell Laboratories, "Transmission Systems For Communication", 5th Ed, 1982, Ch. 11, pp. 246-249.
P. E. Fleischer, "Active Ajustable Loss And Delay Equalizers", IEEE Trans On Comm, vol. Com-22 (Jul. 1974) pp. 951-955.
McBeth Richard R.
O'Neil Paul E.
Tapia Javier J.
Benn Marvin N.
Gerstein Milton S.
Kumar Devendra
Westell Incorporated
Zele Krista M.
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