81
Chapter 6 - Testing and Troubleshooting
6.1 Introduction
Each time you power up the MT2834MR6, it performs an automatic self-test to ensure proper operation. The
MT2834MR6 also has three diagnostic tests: local analog loopback, digital loopback (remote/automatic), and
digital loopback (local/manual). These ITU-T V.54 loopback tests isolate telephone circuit and transmission
problems.
In a loopback test, data from your computer loops through the circuits of your modem and/or a remote modem
before it appears on your monitor. When the loop has been completed, the data on your PC’s monitor should
match the original data.
The local analog loopback test allows you to verify that the modem’s transmitter and receiver circuits are
functioning properly.
The local digital loopback allows you to verify that the local computer or terminal, the two modems, and the
transmission line between them are functioning properly.
The remote digital loopback test allows you to verify that the remote computer or terminal, the remote modem,
the serial ports, the telephone line, and the local modem are functioning properly.

Note: Loopback tests operate at all speeds except 300 bps.

Other tests are initiated with the MultiModemManager software, as explained in the MultiModemManager
Owner's Manual.