Multitech MT56DSU-R Owner's Manual download pdf (Page 35)

Chapter 4 - Troubleshooting

4.3 Diagnostic Tests

The MT565SU-R is set to a default of Normal (non-diagnostic) mode

at the factory. When diagnostics are to be run, change the DIP

switches as described in Chapter 2 of this manual.

When a failure occurs in the digital facility (telco equipment), the

network will detect the failure and send a repetitive OOS signal

sequence to your equipment. Your equipment can detect local loop

failure by the absence or distortion of the digital signal. If an OOS is

received when data is expected, check the remote (far-end)

transmitting equipment. If the remote equipment is transmitting

properly, contact your telephone company. If the telco is required to

perform remote tests, the channel will be temporarily interrupted and

loss of data may occur.

The following sections describe the tests that are available for the

MT56DSU-R.

4.3.1 Local Loopback Test

This test allows you to test the local DTE and local MT56DSU-R.

Use the following steps to perform the Local Loopback Test.

1. Set DIP switch #9 to the down position.

2. The Test (TM) LED lights, and if you send data from your DTE,

it should be looped back to your DTE. If you have access to a

Bit Error Rate Tester, this can be used in place of the DTE.

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Multitech MT56DSU-R Owner's Manual Page 35