3Com 1.024.1644-00 manual Technical Reference Register Default Function, S13

Technical Reference

Register Default Function

S13 (Continued)

*The 1.5K-byte non-ARQ buffer allows data transfer with Xmodem- and Ymodem-type file transfer protocols without using flow control.

The 128-byte option lets remote users with slower modems keep data you are sending from scrolling off their screens. When remote users send your computer an XOFF (Ctrl-S) and you stop transmitting, the data in transit from your modem’s buffer does not exceed the size of their screen.

This is also very helpful in situations when a remote modem/printer application is losing characters.

S14	0	Reserved
S15	0	Bit-mapped register setup. To set the register,
		see instructions for S13.
		Bit	Value	Result
		0	1	Disable ARQ/MNP for V.22.
		1	2	Disable ARQ/MNP for V.22bis.
		2	4	Disable ARQ/MNP
				V.32/V.32bis/V.32terbo.
		3	8	Disable MNP handshake.
		4	16	Disable MNP level 4.
		5	32	Disable MNP level 3.
		6	64	MNP incompatibility.
		7	128	Disable V.42 operation.
		To disable V.42 detect phase, select the total of the
		values for bits 3 and 7 (in other words S15 = 136 [the sum
		of values 8 and 128])
S16	0	Reserved
S17	0	Reserved
S18	0	Test timer for &T loopback testing. Sets the time in
		seconds of testing before the modem automatically times
		out and terminates the test. When set to 0, the timer is
		disabled. Valid range is 1-255.

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