Cabletron Systems CSMIM-T1 manual Power-Up Diagnostics, Local Analog Loopback with Self-Test

Chapter 6: Modem Guide

6.6DIAGNOSTICS

The modem’s diagnostic capabilities verify its performance and can isolate the source of a communications problem. If a problem exists, test all components of the communications path, including the data cable and all connectors.

NOTE

The modem must be in normal or direct mode for loopback tests. It does not support these tests in Bell 103, V.13, V.21, or V.23 mode. The modem supports all loopback tests 1,200 bps or higher.

6.6.1Power-Up Diagnostics

Power-up diagnostics test the program checksum, RAM memory, and components on the modem board each time you power up the modem.

Performing a Power-Up Diagnostic Test

To perform a power-up diagnostic test, enter the following at the command prompt:

AT$D <Enter>

6.6.2Local Analog Loopback with Self-Test

Local Analog Loopback with Self-Test tests the local serial port. The modem sends itself a test data sequence and then verifies the data to make sure that it receives them correctly.

Using Commands to Perform a Local Analog Loopback with Self-Test

To initiate a Local Analog Loopback with Self-Test, type AT&T8 <Enter>. When the test finishes, the screen displays a three-digit number that represents the number of errors. For example:

AT&T8

(no display during test)

000 OK

The test continues until the time set with register S18 runs out, or until the test is terminated by typing AT&T0 <Enter>, or ATH <Enter> to end the test and hang up.

6-16 CSMIM-T1 Hardware Installation Guide