
TECHNICAL REFERENCE
20
Register Default Function
S15 (Continued)
Bit Value Result
5 32 Disable MNP level 3.
6 64 MNP incompatibility.
7 128 Disable V.42 operation.
To disable V.42 detect phase, select the total of the values for bits 3 and 7 (in other words S15 =
136 [the sum of values 8 and 128])
S16 0 Reserved
S17 0 Reserved
S18 0 Test timer for &T loopback testing. Sets the time in seconds of testing before the modem
automatically times out and terminates the test. When set to 0, the timer is disabled. Valid range
is 1-255.
S19 0 Sets the duration, in minutes, for the inactivity timer. The timer activates when there is no data
activity on the phone line; at time-out the modem hangs up. S19 = 0 disables the timer.
S20 0 Reserved
S21 10 Sets the length, in 10-millisecond units, of breaks sent from the modem to the computer;
applies to MNP or V.42 mode only.
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