Multi-Tech Systems MT5600SMI-34 User Manual
Page 80
Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide
80
Register Unit
Range
Default
Description
S41
195 (C3h) General Bit-Mapped Options Status. Indicates the status of
command options. *
Default:
13 (C3h) (00001101b)
Bits 0 -1
Compression selection (%Cn)
0 =
Disabled (%C0)
1 =
MNP 5 (%C1)
2 =
V.42 bis (%C2)
3 =
MNP 5 and V.42 bis (%C3) (Default.)
Bits 2, 6
Auto retrain and fallback/fall forward (%En)
Bit 6
Bit 2 Meaning
0
0
Retrain and fallback/fall forward disabled (%E0)
0
1
Retrain enabled (%E1)
1
0
Fallback/fall forward enabled (%E2) (Default.)
Bit 3 Reserved
Bits 4-5 Reserved
Bit 7 Reserved
S46
138
Data Compression Control. Controls selection of compression. *
The following actions are executed for the given values:
S46=136 Execute error correction protocol with no compression.
S46=138 Execute error correction protocol with compression. (Default.)
S48
7
V.42 Negotiation Control. Negotiation process determines the
capabilities of the remote modem. However, when the capabilities of
the remote modem are known and negotiation is unnecessary, this
process can be bypassed if so desired.
Range: 0, 7, or 128 If an invalid number is entered, it is accepted into
the S-Parameter, but S48 will act as if 128 has been entered.
S48=0 Disable negotiation; bypass the detection and negotiation
phases; and proceed with LAPM.
S48=7 Enable negotiation. (Default.)
S48=128 Disable negotiation; bypass the detection and negotiation
phases; and proceed at once with the fallback action specified
in S36. Can be used to force MNP.