Method and system for extending backup battery life in...

Details Method and system for extending backup battery life in... Method and system for extending backup battery life in...

2007-06-19

2007-06-19

Harold, Jefferey F. (Department: 2614)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S399010

Reexamination Certificate

active

10430860

ABSTRACT:
Current to a relay causes a telephone to be connected to a SLIC. Following LOOP, a sleep switch opens to interrupt current to the power supply converter after a first predetermined period expires. If the telephone is on-hook, loss of current to the relay causes disconnection from the SLIC, but causes connection to a battery.Current sensed from the battery through an off-hook hook switch generates a current signal. The current signal closes a current switch, which is in parallel with the open sleep switch, thereby providing a current path to the converter. The sleep switch then makes and then the current switch breaks.After awakening, a ring-back signal informs a user that telephony service has been restored and a message may indicate that telephony service is being sought. When the telephone is placed back on-hook, counting of a second predetermined period starts, after which the sleep switch opens again.

REFERENCES:
patent: 5815569 (1998-09-01), Akhteruzzaman
patent: 6625281 (2003-09-01), Bernard
patent: 6880093 (2005-04-01), Lyles
patent: 2004/0057576 (2004-03-01), Lavaud et al.
patent: 2004/0213404 (2004-10-01), Posthuma

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