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Modem Reference 6-15
&Fn Load Factory Settings
The AT&F command loads factory default parameters from ROM into
the active configuration profile, replacing the parameters stored there.
This command must be issued by itself. If it is used with another AT
command, its function will be ignored.
&F0 Recall factory settings as active configuration
&F5 Recall factory settings appropriate for ETC mode as
active configuration. This command enables ETC
operation. It is automatically set upon detection of a
cellular phone. The following options are set with &F5:
Local Factory Settings
Function MTC Implementation
LAPM-only error correction \N4
Transmit level fixed per cellular phone S92
Wait for carrier = 90 sec S7=90
CD loss delay = 10 sec S10=100
Auto FF/FB enabled N/A
Start up at 9600bps S40=2
&Gn V.22bis Guard Tone Selection
This option is for international use only. It is not used in North America.
The AT&Gn determines which guard tone, if any, to transmit while in
answer mode (transmitting in the high band). The value of n can be 0, 1,
or 2. This parameter is set automatically for most countries that require it.
&G0 No guard tone set
&G1 550-Hz guard tone set
&G2 1800-Hz guard tone set
&Jn Auxiliary Relay Option
&J0 Auxiliary relay is never closed
&J1 Not supported (returns ERROR)