In dealing with modems, strings are used to customize your dialup connections with a specific modem. In order to add a string to your modem, you first need to enter the control panel, and then double click on the icon called Modems.

From here you press the button labeled Properties.

From the properties screen, you need to click on the tab labeled Connection, and then go to Advanced Settings.

Near the bottom of the advanced settings screen, there is a text area labeled Extra settings. This is where your added modem strings should be located. Individual strings should be separated by a semicolon. By default, this area should be blank.

Some strings that you may find useful for US Robotics Sportster Modems

S27=64  disables Selective Reject &MO  disables V.42bis error control &K3  disables MNP5 compression S15=136  disables V.42 detect

If you experience lock-ups or frequent disconnects with an x2 modem, add the string S15=128.

Other Sources of Modem information:

56K initialization strings     USRobotics X2 AT commands     56K troubleshooting page     Ask Mr. Modem