What init strings enable and disable x2 and/or V.90?
Most modems should default to using V.90, but you may need to explicitly enable V.90 with some models. Also, it’s sometimes useful to be able to disable protocols in order to dial into a particular host. One 56K.COM reader was unable to access his online banking service after upgrading his 3Com Sportster to V.90. Disabling V.90 allowed him to connect to his bank again. Here are the appropriate commands for controlling the 56K protocol used on 3Com V.90 modems, as provided by John Powell, 3Com Field Engineering Manager. Add these commands to the end of your modem init string. Note that these are different in some cases from the commands for x2-only modems.
