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9-373810-A2-GB30-20 November 1996
Table 9-6
(4 of 6)
V.42/MNP/Buffer Configuration Options
*Flw Cntl of Mdm: Disable
Nxt Disable XON/XOFF RTS_to_Mdm
Flow Control of Modem. Determines how the DTE controls the flow of data from the modem.
Disable – The DTE cannot control the flow of data from the modem.
XON/XOFF – Method of flow control in which the modem starts and stops data flow based upon XON and XOFF
characters received from the DTE.
RTS to Modem – Method of flow control in which the modem respectively starts and stops data transmission based
upon the ON and Off state of the DTE’s RTS signal.
The factory default is Disable.
AT commands for Disable are \Q0, \Q2, and \Q4.
AT commands for XON/XOFF are \Q1 and \Q5.
AT commands for CTS to DTE are \Q3 and \Q6.
*XON/XOFF Psthru: Disable
Nxt Disable Enable
XON/XOFF Passthrough. Considers an XON/XOFF character as data and passes it on to the remote modem. In this
case, the DTE at one end of the communications link can send flow control characters to the other DTE. This is also
known as DTE to DTE flow control.
Disable – Flow control characters are processed but are not passed on to the remote modem.
Enable – Flow control characters are processed and passed on to the remote modem.
The factory default is Disable.
NOTE:
This configuration option is only available if the Flow Control configuration option is configured for XON/XOFF.
AT command for Disable is \X0.
AT command for Enable is \X1.
*Mdm/Mdm FlowCtl: Disable
Nxt Disable Enable
Modem-to-Modem Flow Control. If a modem’s buffers begin to fill due to data it is receiving from the remote modem, but
is not passing on to the DTE, it can issue XON/XOFF flow control characters to the remote modem. This only applies if
Buffer (nonerror control) mode is selected. If Error Control mode is enabled, flow control between the modems will
happen automatically, regardless of the setting of this option.
Disable – Modem does not respond to XON and XOFF characters received over the VF line. Also, the modem will not
transmit an XOFF character to the remote end if its receive buffers are full.
Enable – Modem stops transmitting data to the remote modem if it receives an XOFF character over the VF line. An
XON character will enable data transmission. Also, the modem will transmit an XOFF character to the remote end if its
receive buffers are full. Select this setting if the DTE rate is less than the VF line rate or if the DTE must frequently stop
the flow of data to process it.
The factory default is Disable.
NOTE: This configuration option is only available if Flow Control is configured for XON/XOFF.
AT Command for Disable is \G0.
AT Command for Enable is \G1.
*This configuration option is only available if Async/Sync Mode is configured for Async. Refer to the DTE Interface
configuration options group for more on Async/Sync Mode.