User`s manual

AT Command Reference Manual
1048 3-15
&Gn - Select Guard Tone
The modem generates the guard tone selected by this command according to the parameter supplied (DPSK modulation
modes only). The parameter value, if valid, is written to S23 bits 6 and 7.
&G0 Disables guard tone. (Default for US models.)
&G1 Disables guard tone.
&G2 Selects 1800 Hz guard tone. (Default for W-class models.)
This command may not be permitted in some countries.
Result Codes:
OK n = 0 to 2.
ERROR Otherwise.
&Jn - Telephone Jack Control
This command is included only for compatibility and performs no function except to load the S-Register. The parameter
value, if valid, is written S21 bit 1.
&J0 &J0 command. (Default.)
&J1 &J1 command.
Result Codes:
OK n = 0 or 1.
ERROR Otherwise.
&Kn - Flow Control
This command defines the DTE/DCE (terminal/modem) flow control mechanism. The parameter value, if valid, is written to
S39 bits 0, 1, and 2.
&K0 Disables flow control.
&K3 Enables RTS/CTS flow control. (Default for data modem modes.)
&K4 Enables XON/XOFF flow control.
&K5 Enables transparent XON/XOFF flow control.
&K6 Enables both RTS/CTS and XON/XOFF flow control. (Default for fax modem and voice modes.)
Result Codes:
OK n = 0, 3, 4, 5, or 6.
ERROR Otherwise.
&Ln - Leased Line Operation
This command requests leased line or dial-up operation. This command is provided for compatibility only; no mode change is
performed, dial-up operation continues. The OK response is returned for a valid parameter, but no other action is performed.
The parameter value, if valid, is written to S27 bit 2.
&L0 Requests dial-up operation. Dial-up operation continues.
Result Codes:
OK n = 0.
ERROR Otherwise.