Voice S-registers
The following S-register can be set in any appropriate #CLS setting.
S30 - Deadman (Inactivity) Timer
Range:
n = 0 - 255
Default:
0 (OFF, which means DTE should usually be set to some value for Voice)
Command Options:
S30=0 - Deadman timer off. No matter how long it might continue, the
modem never spontaneously hangs up the telephone line or switches to autobaud
mode as a result of inactivity.
S30=1 to 255 - This is the period of time (in seconds), which if
expired causes the modem to hang up the telephone line if it is off-hook
and no data has passed during the period.
The timer is also active whenever the #BDR setting is non zero. In order
to avoid a state where speed sense is disabled (even though the PC can crash,
come back up, and try to issue commands at what should be a supported speed),
the inactivity time-out occurs if there is no data passed on the DTE interface
within the S30 period, even if the modem is on-hook.
DTE software must not select a non zero setting for #BDR until it is ready
to establish a telephone call or virtual connection to speaker or microphone.
When there is an inactivity time out with #CLS=8, the modem always forces
#CLS=0 and #BDR=0.
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