Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate
2005-05-17
2005-05-17
Chan, Wing F. (Department: 2643)
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
C379S093050, C375S222000
Reexamination Certificate
active
06895085
ABSTRACT:
A modem includes a Digital Access Arrangement (DAA) Circuit and modem software that is executed by a processor. When the DAA Circuit 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 DAA Circuit 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 DAA Circuit 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 DAA Circuit 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: 5535265 (1996-07-01), Suwandhaputra
patent: 5940489 (1999-08-01), Cohn et al.
Broadcom Corporation
Chan Wing F.
Garlick Bruce
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