Multi-Tech Systems MT4X56USB manual S38, Upstream data rates

MultiModemUSB User Guide

S38	decimal	0–23	1	Sets “downstream” data rate where K56flex provides rates
				of 32,000 to 56,000 in 2,000 bps increments, V.90 provides
				rates of 28,000 to 56,000 bps in increments of 1,333 bps.
					0 = V.90 disabled		K56flex rates
					1 = V.90 autorate
					2 = 28,000 bps		2 = 32,000 bps
					3 = 29,333 bps		3 = 34,000 bps
					4 = 30,666 bps		4 = 36,000 bps
					5 = 32,000 bps		5 = 38,000 bps
					6 = 33,333 bps		6 = 40,000 bps
					7 = 34,666 bps		7 = 42,000 bps
					8 = 36,000 bps		8 = 44,000 bps
					9 = 37,333 bps		9 = 46,000 bps
					10 = 38,666 bps		10 = 48,000 bps
					11 = 40,000 bps		11 = 50,000 bps
					12 = 41,333 bps		12 = 52,000 bps
					13 = 42,666 bps		13 = 54,000 bps
					14 = 44,000 bps		14 = 56,000 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.
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 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 follow-
				ing table lists the S36 and S48 configuration settings for
					certain types of connections.
						S48=7	S48=128
					S36=0, 2	LAPM or hangup	Do not use
					S36=1, 3	LAPM or async	Async
					S36=4, 6	LAPM, MNP, or hangup	MNP or hangup
					S36=5, 7	LAPM, MNP, or aysnc	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. 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 the 56K digital loss if using the modem thru 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
S109	decimal	0--2	1	Sets one of three 56K operating modes:
				K56flex mode, V.90 mode, or Auto-mode.
				S109=2 forces V.90 connections for testing purposes, etc. S109
				sets the 56K operating mode as shown below:

0 = V.90 disabled

1 = K56flex or V.90 (Dual mode enabled)

2 = V.90 only (K56flex disabled).

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