User Guide

Chapter 1 – AT Commands, S-Registers and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 30
S48 decimal 7 or 128 7 Enables (7) or disables (128) LAPM negotiation. The following
table lists the S36 and S48 configuration settings for certain
types of connections.
S48=7 S48=128
S36=0, 2 LAPM or hang up Do not use
S36=1, 3 LAPM or async Async
S36=4, 6 LAPM, MNP, or hang up MNP or hang up
S36=5, 7 LAPM, MNP, or async MNP or async
S89 seconds 0, 5–255 10 Sets the length of time in the off-line command mode before
the modem goes into standby mode or “sleep mode”. A value
of zero prevents standby mode; a value of 1–4 sets the value
to 5. Standby mode (sleep mode or low power mode) is
controlled by S89. It programs the number of seconds of
inactivity before the modem will go to sleep. The default value
is 0. A value of 0 disables standby mode. The modem will
wake on an incoming ring or an AT command.
S108 decimal 0–3, 6, 7 6 Selects the 56K digital loss if using the modem through a PBX
line. The default value is -6 dB loss, the value used when
calling from a typical POTS line long distance.
0 = -0 dB digital loss, no robbed-bit signaling
1 = -3 dB PBX digital loss
2 = -2 dB digital loss
3 = -3 dB digital loss
6 = -6 dB digital loss
7 = -0 dB digital loss with robbed-bit signaling