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In addition, there are two different modem settings you can change to
improve your V.90 connections. These commands can be added to an
application’s initialization string or sent directly to the modem by using
any communications or terminal application. When sending the com-
mands by themselves, start the command with AT (example:
AT+MS=V34), and press the Enter key. When adding the command to
an application’s initialization string, the “AT” should already be present.
Changing Top Speed (+MS Modulation Selection) Command
You can set the top speed at which your modem attempts to negotiate.
The default is V.90 (32000 to 56000 bps).
Tip: if you routinely try to connect to non-56K
modems or are having trouble establishing
connections, then try to lower the “top speed” by
changing the +MS setting to +MS=V34 or lower.
+MS=V90 V.90 (32000 to 56000 bps) default
+MS=K56 K56flex (32000 to 56000 bps)
+MS=V34 V.34 (2400 - 33600 bps)
+MS=V32B V.32bis (4800 - 19200 bps)
+MS=V32 V.32 (4800 or 9600 bps)
+MS=V23C V.23 with constant carrier (1200/75 or 75/1200 bps)
+MS=V22B V.22bis (2400 bps)
+MS=V22 V.22 (1200 bps)
+MS=V21 V.21 (300 bps)
+MS=B212 Bell 212A (1200 bps)
+MS=B103 Bell 103 (300 bps)
Change Setting For Particular Type of Location (S108 - Digital
Loss Selection) Command
The S108 setting can be changed to improve the likelihood of obtaining
a V.90 connection, depending on your type of location. S108 changes
how digital loss is to be used during a V.90 connection.
Tip: If you are connecting at speeds greater
than 33.6Kbps, but want to get closer to a top
speed of 56Kbps, try changing your S108
setting. Different settings may improve your
connection speed, depending on your type of
location.
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