COMSPHERE 3900 Series Modems
14-10
September 1998
3910-A2-GN32-40
Table 14-2
(6 of 10)
391x Series AT Commands
AT
Command
DCP LCD
Command
Sequence
Description
&Fn
Select Factory Default Configuration Options. Loads factory configuration
options into Active (Operating) area.
&F0
Async Dial
&F1
Sync Dial
&F2
Sync Leased: Answer
&F3
UNIX Dial
&F4
Sync Leased: Originate
&F5
Async Leased: Answer
&F6
Async Leased: Originate
&F7
TMp: Control
&F8
TMp: Trib
Only the &F0 and &F3 commands will leave you in AT Command mode.
The other commands will take you out of AT command control and place
the modem into Dumb mode. The only way to return to AT command
control is via the diagnostic control panel (DCP).
Configure/
Factory
&Gn
V.22bis Guard Tone.
&G0
Disable.
&G1
550 Hz.
&G2
1800 Hz.
Configure\Edit\
Dial Line
NOTE: The V.22bis Guard Tone cannot be disabled in some countries.
&
I
n
Dial Transmit Level.
The AT command is &
I
n, where n is
0 for –1 dBm
1 for –1 dBm
•
•
•
32 for –32 dBm
NOTE: In North America the range of allowable values is –10 dBm to
–32 dBm. This command is disabled in some countries (it
answers OK but does not change the level).
Configure\Edit\
Dial Line
&Ln
Leased Mode.
&L0
Disables leased-line operation.
&L1
2-wire originate leased-line operation.
&L2
4-wire originate leased-line operation.
&L3
2-wire answer leased-line operation.
&L4
4-wire answer leased-line operation.
The &L command will cause the modem to reset before entering or
exiting Leased-Line mode. Therefore, it must be entered as the last
command in an initialization string.
Configure\Edit\
Leased Line
