Intel MD566X manual Qn, Tn, Xn

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 Serial Port Flow Control: This command specifies the DTE-to-modem flow control. Software flow control uses the XOFF (13h) command to stop and the XON (11h) characters to start data transmission, both to and from the DTE. Unidirectional hardware flow control uses the CTS control line to stop or start data from the DTE only, while bidirectional hardware flow control also uses the RTS control to stop or start data from the modem.

\Qn	3
	n = 0–3
	n = 0	Disables flow control
	n = 1	XON/XOFF software flow control
	n = 2	Unidirectional hardware flow control — CTS
	n = 3*	Bidirectional hardware flow control — RTS/CTS

		Set Inactivity Timer: During a buffer (normal) or reliable connection, if no data is
		sent or received within the inactivity time period, the link is disconnected. The de-
\Tn	0	fault, ‘0’, disables this feature.
		n = 0–90	Length in minutes
		n = 0*	Disables inactivity timer
		Accept Auto-Reliable Link: In buffer (normal) mode (\N0 or \N1), the modem at-
		tempts to answer an MNP link request, regardless of whether the modem originated
\U	none	or answered the telephone call (physical connection). The remote modem must orig-
		inate the MNP link request for the link to be established (refer to the preceding \O
		command).
		Set XON/XOFF Pass-Through:If software flow control is enabled (\Q1), this com-
		mand defines whether the XON (11h) and XOFF (13h) characters received from the
		DTE are sent to the remote modem. In addition, if the modem port flow control is en-
		abled (\G1) in normal mode, the command specifies whether the XON and XOFF
		characters received from the remote modem are sent to the DTE. In both cases, flow
\Xn	0	control operation is not affected.
		n = 0, 1
		n = 0*	Processes flow control characters *
		n = 1	Processes flow control characters and passes them through to the
			local or remote so they can process the characters.
		Switch to Reliable Mode: In buffer (normal) mode (\N0 or \N1), the modem at-
\Y	none	tempts to originate or answer an MNP link request, depending on whether the mo-
		dem originated or answered the physical connection, respectively. The remote mo-
		dem must attempt to answer/originate the MNP link for the link to be established.
		Switch to Buffer Mode: During an MNP link, the modem disconnects the link (exit
\Z	none	error correction/data compression) and changes to buffer mode without disconnect-
		ing the modem-to-modem connection.

Programmer’s Guide Intel Confidential 69