Western Telematic MT5634 manual Registers

						S-Registers
Register	Unit	Range	Default	Description
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,	MNP or hang up
					or hang up
				S36=5, 7	LAPM, MNP,	MNP or async
					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

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