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Troubleshooting 19
To force different communication speeds
(protocols)
Type these AT commands
and press Enter
Dualmode (V.90 or V.92)—56000 bps
AT+MS=V92,1
V92 only (disable V.90)—56000 bps
AT+MS=V92,0
V.90 only (disable V.92)—56000 bps
AT+MS=V90,0
Disable both 56K and autorate on V.34—33600 bps
AT+MS=V34,1
V.34—33600 bps
AT+MS=V34,0
V.32bis—14400 bps
AT+MS=V32B,0
V.32—9600 bps
AT+MS=V32,0
2400 bps
AT+MS=V22B,0
1200 bps
AT+MS=V22,0
Notes:
Some software allows these commands to be added to the
list of dial prefixes or the initialization string.
When the protocol is forced, the modem will not attempt to
connect at other protocols if it cannot connect at the forced
protocol. It will try to connect at the fastest speed available
within the forced protocol.
There are other configurations that can be forced as well. If you need
to select a particular configuration, use the AT command strings
shown below.
Remember that if you do this, the modem will not have received the
commands in your software’s initialization string as it normally would.
Using the
ATZ
command overcomes this problem if you have saved
all of your setup parameters in nonvolatile memory. (To save setup
parameters in nonvolatile memory in terminal mode: Type
AT
, fol-
lowed by the parameter settings you desire, followed by
&W
, and
press
Enter
. For example, if you type
AT &C1 &D2 &W
and press
Enter
, the
&C1
and
&D2
parameter settings are stored.)