Introduction - Multitech MT2834MR Owner's Manual

PN 88300150
6.1

Introduction

Each time you power up the MT2834MR, it performs an automatic self- test to ensure proper operation.
The MT2834MR also has four diagnostic test features: Local Analog Loopback, Digital Loopback
(remote/automatic), Digital Loopback (local/manual) and a modem Back-to-Back test.
The CCITT V.54 Loopback Testing capability supports telephone circuit and transmission problem
isolation. If Pin 8 on the RS232 interface goes high, the MT2834MR goes into analog loopback mode.
Other tests are initiated with the MultiCommManager Software as explained in the MultiCommManager
Owner's Manual.
A loopback test involves entering data from your PC and looping that data through the circuits of your
modem and/or a remote modem. When the loop has been completed, the original data entered should
match the data received back on your PC's monitor after the test.
The Local Analog Loopback Test allows you to verify that the modem's transmitter and receiver circuits
are functioning properly.
The Digital Loopback Test (local/manual) allows you to verify that the remote computer or terminal, the
remote modem, serial ports, the telephone line and the local modem are functioning properly.
The Digital Loopback Test (remote/automatic) allows you to verify that the local computer or terminal, the
two modems and the transmission line between them are functioning properly.
The Back-to-Back test lets you connct two MT2834MRs with a back-to-back cable to verify proper modem
operation.
In asynchronous mode, upon completion of testing, enter either Escape Sequence, +++AT<CR> or
<BREAK>AT<CR>.
Note: All loopback tests will operate at all speeds except 300 bps.
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