3Com 3C900B Installation And Operating Instructions Manual page 136

Register Default
S15 (cont.)
S16 0
S18 0
S19 0
S21 10
132
T
ECHNICAL
Function
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.
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.
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.
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.
Sets the length, in 10-millisecond units, of breaks sent from the modem to the computer; applies to MNP
or V.42 mode only.
Q R
UICK EFERENCE