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TECHNICAL QUICK REFERENCE
132
Register Default Function
S15 (cont.) Bit Value Result
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.
S16 0 Bit-mapped register setup. To set the register, see instructions for S13.
Bit Value Result
0 1 Reserved
1 2 Reserved
2 4 Touch tone test.
4 8 Use internal test pattern.
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.
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.