Toshiba Portege 3500 User Manual page 211

S-registers
I-4
This register sets the time, in seconds, that the modem must
wait before hanging up because carrier is not detected. The
timer is started when the modem finishes dialing (originate), or
goes off-hook (answer). In originate mode, the timer is reset
upon detection of an answer tone if allowed by county
restriction. The timer also specifies the wait for silence time for
the @ dial modifier in seconds. S7 is not associated with the W
dial modifier.
Range: 1-255
Default: 50
Units: seconds
This register sets the time, in seconds, that the modem must
pause when it encounters a comma (,) in the dial command
string. In some countries/regions, S8 will set both wait before
dialing and comma pause time.
Range: 0-255
Default: 2
Units: seconds
This register determines the dialing speed which is prefixed for
each country/region.
Range: 50-255
Default: 95
Units: .001 seconds
This register sets the value (in 20 millisecond increments) for the
required pause after the escape sequence.
Range: 0-255
Default: 50
Units: .02 seconds
Portégé 3500