Reference Information
Modem Reference Information
94
Reference Guide
Conexant AT Commands (Advanced Users Only)
Command
Function (Conexant)
+MS=
a
,
b
,
c
,
d
,
e
,
f
Select modulation (
b
,
c
,
d
,
e
, and
f
are optional).
a
is the carrier (allowable rates in parentheses): B103 (300), B212 (1200 Rx/75 Tx or 75
Rx/1200 Tx), V21 (300), V22 (1200), V22B (1200/2400), V23C (1200), V32 (4800/9600), V32B
(4800–14400),
V34 (2400–33600), K56 (32000–56000), V90 (28000–56000), V92 (downstream: 28000–
56000; upstream: 24000–48000).
b
is automode: 0=disabled, 1=enabled (default).
c
is minimum transmit (Tx) rate (bps).
d
is maximum transmit rate (bps).
e
is minimum receive (Rx) rate.
f
is maximum receive rate (bps).
+WS=
n
Set PDC mode: 1=disable (default), 20=enable.
ECC Commands
%C
n
Set data compression: 0=disable, 1=enable V.42 bis and MNP 5, 2=enable V.42 bis and MNP
5,
3=enable V.42 bis and MNP 5 (default).
+EB=
a
,
b
,
c
Select break handling (
b
and
c
are optional):
a
=0 — break is ignored.
b
=0 — transmitted V.42 L-SIGNAL will not indicate break signal length.
c
=0 — break is not delivered to DTE.
+EFCS=0
Select 16-bit FCS specified in V.42.
+ER:
a
Select error control protocol: NONE=error control not in use, LAPM=V.42 LAPM protocol,
ALT=MNP.
+ER=
n
Error control reporting: 0=disable, 1=enable.
+ES=
a
,
b
,
c
Select error control and synchronous mode (
b
and
c
are optional).
a
is requested mode when modem is originator: 0=initiate call with direct mode, 1=initiate call
with normal mode, 2=initiate V.42 without detection phase, 3=initiate V.42 with detection phase
(default), 4=initiate MNP, 6=initiate V.80 synchronous access mode when connection is
completed.
b
specifies fallback mode when modem is originator: 0=LAPM, MNP, or normal mode error
control optional (default); 1=LAPM, MNP, or direct mode error control optional; 2=LAPM or
MNP error control required; 3=LAPM error control required; 4=MNP error control required.
c
specifies fallback mode when modem is answerer or specifies V.80 synchronous access
mode: 1=error control disabled, use normal mode; 2=LAPM, MNP, or normal mode error
control optional (default); 3=LAPM, MNP, or direct mode error control optional; 4=LAPM or
MNP error control required; 5=LAPM error control required; 6=MNP error control required;
8=initiate V.80 synchronous access mode when connection complete.
+ESR=0
Disable selective repeat option in V.42.
+ETBM=
a
,
b
,
c
Handle data remaining in modem buffers on call termination (
b
and
c
are optional):
a
=0 — disconnect occurs immediately and buffered transmit data is discarded.
b
=0 — disconnect occurs immediately and buffered receive data is discarded.
c
=0 — modem does not attempt to deliver buffered data and discards data.
FAX Class 1
+FAE=
n
Data/fax auto answer: 0=disable (default), 1=enable.
+FAR=
n
0=disable adaptive reception (default), 1=enable.
+FCL=
n
Set loss-of-carrier delay in units of 100 ms (
n
=0 to 255).
+FCLASS=
n
Set active service class: 0=data mode (default), 1=Fax Class 1, 1.0=Fax Class 1.0 mode,
8=voice mode.
+FIT=
n
,
a
Set DTE inactivity timeout
n
seconds after which modem goes on-hook (
a
=0) or DCE goes on
hook (
a
=1).
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