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4 AT Commands, S-Registers, and Result Codes
42
MultiModemZPX User Guide
19 50666 bps
20 52000 bps
21 53333 bps
22 54666 bps
23 56000 bps
S42 decimal 0–1 1 Enables/disables the 56K auto rate. When
56K auto is disabled, fallback to V.34 is also
disabled. 0 = disable; 1 = enable.
S48 decimal 7 or 128 7 Enables (7) or disables (128) LAPM negotia-
tion. The following table lists the S36 and
S48 configuration settings for certain types
of connections.
S48=7 S48=128
LAPM or async Async
LAPM or hangup Do not use
LAPM, MNP, or aysnc
LAPM, MNP, or hangup MNP or hangup
MNP or async
S36=0, 2
S36=1, 3
S36=4, 6
S36=5, 7
S89 seconds 0, 5–255 0 Sets the inactivity time in the off-line com-
mand mode before the modem goes into
standby mode. A value of 0 disables stand-
by mode; values of 1–4 set the value to 5.
S108 decimal 0–3, 6, 7 6 Selects the 56K digital loss if using the modem
thru a PBX line. The default value is -6 dB
loss, the value used when calling from a
typical POTS line long distance.
Value Digital loss
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
S109 decimal 0–62, even 18 Selects the PCM (56K) operating mode.
numbers Interactive with the +PQC= command.
Bit 56K mode
0 Reserved—always 0
1 Enable V.90
2 Enable quick connect (phase 1)
3 Enable PCM upstream
4 Enable V.92
5 Enable quick connect (phase 2)
Register Unit Range Default Description