Technics MT5634SMI-34, MT5634SMI-92 manual S38, S48=7 S48=128

				Chapter 5 – AT Commands, S-Registers, and Result Codes
				18 = 31200 bps
				19 = 33600 bps
S38	decimal	0–23	1	Sets “downstream” data rate where V.90 provides rates of 28,000 to
				56,000 bps in increments of 1,333 bps.
				0 = V.90 disabled
				1 = V.90 auto rate
				2 = 28,000 bps
				3 = 29,333 bps
				4 = 30,666 bps
				5 = 32,000 bps
				6 = 33,333 bps
				7 = 34,666 bps
				8 = 36,000 bps
				9 = 37,333 bps
				10 = 38,666 bps
				11 = 40,000 bps
				12 = 41,333 bps
				13 = 42,666 bps
				14 = 44,000 bps
				15 = 45,333 bps
				16 = 46,666 bps
				17 = 48,000 bps
				18 = 49,333 bps
				19 = 50,666 bps
				20 = 52,000 bps
				21 = 53,333 bps
				22 = 54,666 bps
				23 = 56,000 bps
				Upstream data rates: Upstream V.90 data rates are 4800 to 33,600
				bps in 2400 bps increments.
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
				S36=0, 2	LAPM or hang up	Do not use
				S36=1, 3	LAPM or async	Async
				S36=4, 6	LAPM, MNP, or hang up	MNP or hang up
				S36=5, 7	LAPM, MNP, or async	MNP or async
S89	seconds	0, 5–255	10	Sets the length of time in the off-line command mode before the
				modem goes into standby mode or “sleep mode”. A value of zero
				prevents standby mode; a value of 1–4 sets the value to 5. Standby
				mode (sleep mode or low power mode) is controlled by S89. It
				programs the number of seconds of inactivity before the modem will
				go to sleep. The default value is 0. A value of 0 disables standby
				mode. The modem will wake on an incoming ring or an AT command.
S108	decimal	0–3, 6, 7	6	Selects the 56K digital loss if using the modem through a PBX line.
				The 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

SocketModem Global MT5634SMI Developer’s Guide 41