System and method for preventing telephone line blocking by a modem
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United States of America Patent
Stats
-
Jun 15, 2010
Grant Date -
Aug 17, 2006
app pub date -
Mar 21, 2006
filing date -
Sep 10, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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