2
AT Commands
(continued)
X2
Enables extended result codes 5–16, dial
tone detect, and disables busy tone
detect.
X3
Enables extended result codes 5–16,
disables dial tone detect and enables
busy tone detect. Refer to
Result Codes
section.
X4
Enables extended result codes 5–16,
dial tone detect, and busy tone detect.
Refer to
Result Codes section.
X5
Adds EC suffix to extended result codes
(20–27) if error control is used, enables
dial tone detect and busy tone detect.
X6
Adds either V.42 or MNP suffix to
extended result codes (20–27) if data
compression is used, enables dial tone
detect, and busy tone detect.
X7
DTE rate appears in CONNECT
message instead of line rate, enables dial
tone detect and busy tone detect. Refer
to
Result Codes section.
Yn
Long Space Disconnect
Y0
Disable.
Y1
Enable.
Zn
Reset and Load Active
Z0
Loads contents of Active (Saved) into
Active (Operating).
Z1
Loads contents of Customer 1 into Active
(Operating).
Z2
Loads contents of Customer 2 into Active
(Operating).
Z3
Loads contents of Active (Saved) into
Active (Operating) and performs a reset.
Z9
Performs a full modem reset.
&Cn
LSD Control
&C0
Forced On. Forces LSD ON at all times.
&C1
Standard RS232. LSD is ON when the
remote modem’s carrier signal is
detected. LSD is Off when carrier
signal is not detected.
&C2
Wink When Disc. LSD, normally forced
ON, turns Off for approximately 1 to 2
seconds upon disconnect.
&C3
Follows DTR. State of LSD follows state
of DTR.
&C4
Simulated Control Carrier. State of LSD
follows state of remote modem’s RTS.
&C5
=DTR/DiscOff. State of LSD follows
state of DTR except upon a disconnect
where DTR remains ON and LSD turns
Off. DTR must then toggle Off and ON to
turn LSD ON. Required for AT&T
DATAKIT dial-out applications.
&C6
Bridge Retrain. LSD behaves as in
Standard RS232, except that it is turned
Off when retrain lasts longer than 10
seconds, and ON when no retrain is
detected for 10 seconds.
AT Commands
(continued)
&Dn
DTR Action
&D0
Ignore. Modem ignores the DTR (Data
Terminal Ready) signal and treats it as
always ON.
&D1
Off=Command Mode. Modem enters
online Command mode when DTR is
lowered.
&D2
Standard RS232. DTR signal is
controlled by the DTE.
&D3
Off=Reload Straps. Modem loads Active
(Operating) area with Active (Saved)
area when DTR is lowered.
&D4
Controls On-Hook. Modem does not
disconnect until DTR lowered by DTE.
&D5
Controls Tx Mute. Transmitter output
muted when DTR is lowered.
&Fn
Loads Factory Configuration
&F0
Loads Async Dial factory configuration
options into Active (Operating)
configuration area.
&F1
Loads Sync Dial factory configuration
options into Active (Operating)
configuration area.
&F2
Loads Sync Leased (Answer Mode)
factory configuration options into Active
(Operating) configuration area.
&F3
Loads UNIX Dial factory configuration
options into Active (Operating)
configuration area.
&F4
Loads Sync Leased (Originate Mode)
factory configuration options into Active
(Operating) configuration area.
&F5
Cellular (Mobile). Valid only if ETC is
installed.
&F6
Cellular (PSTN). Valid only if ETC is
installed.
&Gn
V.22bis Guard Tone
&G0
Disables guard tone.
&G1
Sets guard tone to 550 Hz.
&G2
Sets guard tone to 1800 Hz.
&
I
n
Dial Transmit Level
&
I
10
–10 dBm.
&
I
11
–11 dBm.
•
•
•
•
&
I
32
–32 dBm.
&
I
99
ETC 1.0 (Cellular). Valid only if ETC is
installed.
&
I
100
ETC 1.1 (Cellular). Valid only if ETC is
installed.
&Jn
Dial Transmit Level Type
&J0
Modem sets dial transmit level to
Permissive mode at –9 dBm.
