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MultiModemZPX User Guide
Register Unit
S42
S48
S89
S108
S109
4 AT Commands, S-Registers, and Result Codes
Range
Default
decimal 0–1
decimal 7 or 128
seconds 0, 5–255
decimal 0–3, 6, 7
decimal 0–62, even 18
numbers
Description
19
50666 bps
20
52000 bps
21
53333 bps
22
54666 bps
23
56000 bps
1
Enables/disables the 56K auto rate. When
56K auto is disabled, fallback to V.34 is also
disabled. 0 = disable; 1 = enable.
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
LAPM or hangup
S36=0, 2
LAPM or async
S36=1, 3
LAPM, MNP, or hangup
S36=4, 6
LAPM, MNP, or aysnc
S36=5, 7
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.
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
Selects the PCM (56K) operating mode.
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)
S48=128
Do not use
Async
MNP or hangup
MNP or async
42
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