Toshiba A40 Series - Manual (Page 241)

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&Gn V.22bis guard tone control
This command determines which guard tone, if any, to transmit while
transmitting in the high band (answer mode). This command is only
used in V.22 and V.22bis mode. This option is not used in North
America and is for international use only.
&G0 Guard tone disabled (default).
&G1 Sets guard tone to 550 Hz.
&G2 Sets guard tone to 1800 Hz.
Result Codes:
OK n=0,1,2
ERROR Otherwise
&Kn Local flow control selection
&K0 Disable flow control.
&K3 Enable CTS/RTS flow control (default).
&K4 Enable XON/XOFF flow control.
Result Codes:
OK n=0,3,4
ERROR Otherwise
&Pn Select Pulse Dial Make/Break Ratio (WW)
&P0 Selects 39% - 61% make/break ratio at 10 pulses per second.
&P1 Selects 33% - 67% make/break ratio at 10 pulses per second.
&P2 Selects 33% - 67% make/break ratio at 20 pulses per second.
Result Codes:
OK n=0,1,2
ERROR Otherwise
&Tn Self-test commands
These tests can help to isolate problems if you experience periodic
data loss or random errors.
Appendix C