These need to be in all lower case with no spaces. If these settings are correct, you have probably lost your connection and should redial. Listen to your dial tone and if you hear a lot of static, call your telephone company and have them check your line. Otherwise, try dialing in again. If this persists, your modem could also be damaged.
Power surges can weaken or damage modems.
If in doubt, try a different modem and see if that helps your connection. Otherwise, you might find yourself receiving wierd errors and disconnects when people call your phone number.