2400 BPS External Modem (250-3026) Testing The Modem Faxback Doc. # 5036 Power Up and Installation Testing: Flip the power switch on your modem to the On position. The MR (Modem Ready) light should come on. Depending on various modem settings and factors exter- nal to the modem, other lights may also be on. When you first turn on the modem, it automatically performs a self-test to verify that it is functioning properly. This test operates in the "analog loopback mode" using internally generated test patterns. If an error is found, it will send an error message to the monitor the first time it is used. Running a Brief Modem Test: To confirm that your modem is communicating with your computer, you can perform the following test: Run your communications software in "terminal", "local", or "dumb" mode. In many programs this is the mode entered when the program starts. Type AT and press ENTER. You should see: AT OK (smm 07/28/93) (smm 08/26/93)