User Manual

77
Chapter 4—AT Commands, S-Registers, Result Codes
REGISTER UNIT RANGE DEFAULT DESCRIPTION
16 = 26400 bps
17 = 28800 bps
18 = 31200 bps
19 = 33600 bps
S38 decimal 0–14 1 Sets maximum 56K downstream speed at which modem attempts to connect.
Default maximum speed is 56 Kbps.
0 = 56K disabled
1 = 56K enabled w/automatic speed selection at maximum modem speed
2 = 32000 bps
3 = 34000 bps
4 = 36000 bps
5 = 38000 bps
6 = 40000 bps
7 = 42000 bps
8 = 44000 bps
9 = 46000 bps
10 = 48000 bps
11 = 50000 bps
12 = 52000 bps
13 = 54000 bps
14 = 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.
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
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 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.
S108 decimal 0–3, 6, 7 6 Selects 56K digital loss if using the modem thru a PBX line. 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