Intel MD566X manual Intel Confidential

56K V.92 Data, Fax, and Voice Chipset

Table 4-2. V.44 / V.42 / V.42 bis and MNP Data Mode Command Descriptions

Set V.42 Detect Phase: In V.42 modes (\N3, \N4), this command specifies whether the modem detects V.42, MNP, or no error-correcting protocols from the remote mo- dem and changes to the appropriate mode. Otherwise, only V.42 is attempted.

-Jn 1

n = 0, 1

n = 0 Disables the V.42 detect phase

n = 1* Enables the V.42 detect phase

V.42 bis Compression Control: This command specifies whether the data in the LAPM frames are compressed using V.42 bis data compression. This can improve throughput by as much as 400%. Compression can be negotiated to operate in one direction or both.

"Hn	3	n = 0–3
		n = 0	Disables V.42 bis
		n = 1	Enables V.42 bis only when transmitting data
		n = 2	Enables V.42 bis only when receiving data
		n = 3*	Enables V.42 bis for both transmitting and receiving data

		V.42 bis String Length: This command specifies the maximum number of charac-
		ters that can be compressed into one V.42 bis code word. The default value of 32
"On	32	optimizes throughput for most file types.
		n = 6–250	Number of characters
		n = 32*	Usual number of characters

70 Intel Confidential Programmer’s Guide