How do I force a V.90 connection for Xircom modems?

I use the following Xircom modems and want to force a V.90 connection for them. How should I do it?
- CreditCard Ethernet 10/100+Modem 56
- CreditCard Modem 56-GlobalAccess

To force a V.90 connection for xircom modems, please refer to the procedure below:

1) Go to [Start]->[Settings]->[Control Panel]->[modem] and choose the driver to open [Modem Properties].
2) Click [Advanced] in the [Connection] tab and input the following command in [Extra settings]:

ATS109=2

Note: If the host does not support V.90, the connection falls directly back to V.34.

In this case, please contact Xircom support center or access the web http://www.xircom.com/suprtset.html to get further information.