Telephonic communications – Subscriber line or transmission line interface
Patent
1994-07-28
1995-06-06
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
379398, 379377, 379391, 379390, 379340, H04M 704
Patent
active
054229502
ABSTRACT:
An automatic loss compensation for use in a two to four wire hybrid converter in a telephone system. Many hybrid converters provide a substantially fixed gain for receive signals that are provided to the customer loop telephone line and for transmit signals that are provided to the digital carrier transmission line. The compensation circuit includes a measurement circuit, controller, and receive and transmit amplifier. The measurement circuit determines the length of the customer loop telephone line and provides a length signal. The controller receives the length signal and categorizes the length as being within one of a plurality of segments. The controller appropriately varies the amplification and phase of the receive signal, which is then combined with an inverted transmit signal, in order to substantially reduce reflected signals from the transmission line and transmission line termination.
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Garcia Frank X.
Miller Bruce R.
Dwyer James L.
Saint-Surin Jacques M.
Teltrend Inc.
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