USRobotics V.34 user manual Bit ValueResult

COURIER HIGH SPEED MODEMS

Register	Default	Function
S24	150	Sets the duration, in 20-millisecond units,
		between pulsed DSR signals when the
		modem is set to &S2 or &S3. The default
		is 3 seconds.
S25	5	Sets DTR recognition time in 1/100th of a
		second units.
S26	1	Sets the duration, in 1/100th of a second
		units, of the delay between RTS and the
		modem's CTS response in synchronous
		mode.
S27	0	Bit-mapped register. To set the register,
		see the instructions for S13.

Bit	ValueResult
0	1	Enable ITU-T V.21 modulation
		at 300 bps for overseas calls. In
		V.21 mode, the modem an-
		swers both Bell 103 and V.21
		calls, but only originates V.21
		calls.
1	2	Enable unencoded (non-trellis-
		coded) modulation in V.32
		mode; this option is part of the
		ITU-T V.32 recommendation,
		but is rarely used.
2	4	Disable V.32 modulation; used
		for testing HST modulation in
		Dual Standard modems.
3	8	Disable 2100 Hz answer tone to
		allow two V.42 modems to
		connect more quickly.
4	16	See next page.
5	32	See next page.
6	64	Reserved.

Summaries and Tables B-21