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CHAPTER 4: AT Commands, S-Registers, and Result Codes
Register Unit Range Default Description
S42 decimal 0–1 1 Enables/disables the 56 kbps
auto rate. When 56 kbps is
disabled, fallback to V.34 is
also disabled. 0=disable;
1=enable.
S43 decimal 0–1 1 For testing and debugging
only. Enables/disables V.32bis
start-up auto mode operation.
0=disable; 1=enable.
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 hangup do not use
S36=1, 3 LAPM or async Async
S36=4, 6 LAPM, MNP, or MNP or
hangup hangup
S36=5, 7 LAPM, MNP, or MNP or
async 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. A value of zero prevents
standby mode; a value of 1–4
sets the value to 5.