Multi-Tech Systems MT5600SMI-PL92, MT5600SMI-XL34 Register Unit Range Default Description S41

Chapter 5 – AT Commands, S-Registers, and Result Codes

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.

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 80