System and method for preventing telephone line blocking by...

Details System and method for preventing telephone line blocking by... System and method for preventing telephone line blocking by...

2006-03-21

2010-06-15

Briney, III, Walter F (Department: 2614)

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

C379S093050, C379S387010, C379S399010

Reexamination Certificate

active

07738652

ABSTRACT:
A modem includes modem circuitry and modem software that is executed by a processor. When the modem circuitry detects that the modem software is nonfunctional, it enters an on-hook state to prevent blocking of a coupled telephone line. A nonfunctional state of the modem software is detected when the modem software ceases to interact with the modem circuitry in an expected manner. In a first operation, the nonfunctional state is determined when the modem software does not reset a count down timer in the modem circuitry before the count down timer reaches a termination value. In a second operation, the nonfunctional state is determined when the modem software does not access the modem circuitry before the count down timer reaches the termination value. In a third operation, the nonfunctional state is determined when the modem software ceases writing transmit data to DMA memory.

REFERENCES:
patent: 4852151 (1989-07-01), Dittakavi et al.
patent: 6351781 (2002-02-01), Gracias et al.
patent: 6895085 (2005-05-01), Gonikberg
patent: 7046773 (2006-05-01), Gonikberg

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