Test Sequence For Troubleshooting New Installs Or Existing Circuits - ADTRAN DSU III AR User Manual

Chapter 11. Testing and Troubleshooting

Test Sequence for Troubleshooting New Installs or Existing Circuits

If your DSU...
seems to be having problems
is receiving excessive data errors
is receiving excessive errors
requiring retransmission of data
and the remote unit is error free
If an external BERT tester is available, these additional tests may be per-
formed: DTE & Loop Test, DTE Only Test, and Loop Only Test.
If the unit fails any of these tests or the problem has not been
determined, contact ADTRAN Technical Support (see page xi in
the front section of this manual).
The DSU III AR unit diagnostics tests can be initiated through AT
Commands from the DTE interface. These commands are listed in
Table 11-3 on page 11-9.
11-8
Perform a Self Test to determine if the unit is
operational
Perform a DTE with Test Pattern requiring re-
transmission to determine if the unit's internal
transmitter and receiver is operating error free
Perform a Remote Test to verify the connection
between the local and remote unit is error free.
Run the test using all available test patterns
DSU III AR User Manual
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