Test Pattern; Test Purpose; Figure 11-13.Test Pattern Only - ADTRAN DSU III AR User Manual

Chapter 11. Testing and Troubleshooting

Test Pattern

The T
BERT tester for the purpose of testing the DDS circuit. When this
test is used, the remote DSU/CSU must be in loopback or
transmitting a test pattern. Figure 11-13 illustrates the data paths
for this mode.
LOCAL
DSU/CSU
Error Test Pattern
Inject Generator
Tx
Rx
Error Test Pattern
Clear Detector

Test Purpose

Testing by using a test pattern is used for the following purposes:
•
•
•
11-20
P option converts the local DSU III AR into a
EST ATTERN
Tx
TELCO
Rx
Transmits user selected test pattern using an internal test
pattern generator, and compares the received data using
internal test pattern detector to detect whether there are any
errors on the DDS circuit
Injects errors and verifies the unit transmits data across the
communication circuit to the remote unit.
Helps determine from which direction the circuit is receiving
errors.
DSU III AR User Manual
REMOTE
DSU/CSU
Error Test Pattern
Inject Generator
Tx
Rx
Error Test Pattern
Clear Detector
Figure 11-13. Test Pattern Only
Tx
Rx
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