Multitech CommPlete MT5634HD8, Руководство пользователя, Страница: 32 / 99

MT5634HD8 User Guide
26 CommPlete Communications Server
C n Carrier Control{xe "AT commands:C"}{xe "carrier control"}{xe "AT
commands:Carrier Control"}
n = 1
Default: C1
The Cn command provides backward compatibility with some data
communications software.
C1 enables normal transmit carrier switching.
-C n Data Calling Tone{xe "AT commands:-C"}{xe "Data Calling Tone
command"}
n = 0 or 1
Default: -C0
The data calling tone is a tone of a certain frequency and cadence, as specified in the
V.25 standards, which identifies whether it is remote data, fax, or voice. The
frequency is 1300 Hz, with a cadence of .5 s on and 2 s off.
-C0 disables the V.25 data calling tone.
-C1 enables the V.25 data calling tone.
F Echo Online Data Characters{xe "AT commands:F"}{xe "Echo Online
Data Characters command"}
n = 1
Default: F1
This command determines if the modem echoes data from the DTE. This command
provides backward compatibility with some data communications software.
F1 disables online data character echo.
&G n Guard Tones{xe "AT commands:&G"}{xe "Guard Tones command"}
n = 0, 1, or 2
Default: &G0 (models outside U.K.) or &G2 (U.K. models only)
The &G command is used to control the presence or absence of guard tones from the
transmitter when in answer mode at either 1200 or 2400 bps. Guard tones are used in
Europe and other areas to allow the modem to function in the telephone systems.
Guard tones are not used in the United States. U.K. models are locked at &G2 (1800
Hz guard tone).
&G0 disables ITU-T guard tones.
&G1 enables ITU-T 550 Hz guard tone.
&G2 enables ITU-T 1800 Hz guard tone.