Telephonic communications – Subscriber line or transmission line interface
Patent
1996-06-27
1998-09-29
Hunter, Daniel S.
Telephonic communications
Subscriber line or transmission line interface
379377, 379322, 379387, 379412, 379413, 323282, H04M 100, H04M 300, G05F 140
Patent
active
058155694
ABSTRACT:
A line interface circuit (LIC) used in telecommunications networks operates in either a high frequency mode or a low frequency mode, depending upon the status of its associated customer premises equipment. A LIC main controller detects a change in state of customer premises equipment via a battery feed circuit. If the customer premises equipment is off-hook, a switch associated with a resistor-capacitor (RC) circuit is activated to lower the resistance value of the RC circuit, and thereby, increase the operating frequency of the LIC. During on-hook intervals, the main controller deactivates the switch, and the LIC operates at a lower, default frequency.
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Appiah Charles N.
Ghose Mony R.
Hunter Daniel S.
Lucent Technologies - Inc.
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