Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
2007-02-27
2007-02-27
Harold, Jefferey F. (Department: 2614)
Telephonic communications
Subscriber line or transmission line interface
Power supply
C379S399010
Reexamination Certificate
active
10372733
ABSTRACT:
A device and a method for detecting presence of service on a telephone line prior to and during activation of alternative service on the line. The method comprises performing a first voltage detection on a subscriber line (S20), activating a subscriber line interface circuit (SLIC) if no pre-existing service is detected (S30), the SLIC providing an interface between the subscriber line and a service provider, and performing a second voltage detection on the subscriber line after a usage-dependent time has elapsed (S60), the time being determined by heuristics which consider several factors, including usage history of the line and time of day.
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Ramey Blaine Edward
Wittman Brian Albert
Harold Jefferey F.
Kolodka Joseph J.
Laks Joseph J.
Levy Robert B.
Thomson Licensing
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