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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.
82023101.p65
Chapter 4 - Troubleshooting
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2/12/01, 2:52 PM
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