Figure 11-12. Initiating A Dte Test With Test Pattern - ADTRAN DSU III ARdc User Manual

Chapter 11. Testing and Troubleshooting
1=LOCAL UNIT
2=TEST
2=REMOTE UNIT

Figure 11-12. Initiating a DTE Test with Test Pattern

Interpreting Test Results
If the unit is functioning properly, the DSU III ARdc displays:
The first line of the display indicates the type of test being performed
while the second line of the display indicates the number of errors accu-
mulated by the test pattern detector.
If errors occur during this test, the test error count can be reset to zero by
pressing 1. To verify proper operation of this test, single bit errors can be
injected into the transmitted test pattern by pressing 2. These errors
appear on the TEST ERR display.
Test Pattern
The Test Pattern option converts the local DSU III ARdc into a 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. Fig-
ure 11-13 illustrates the data paths for this mode.
11-16
1=DTE & LOOP(LL)
2=LOOP ONLY (RT)
3=DTE ONLY
4=DTE WITH TP
5=TEST PATTERN
6=SELF TEST
DTE WITH TP
TST ERR=XX
DSU III ARdc User Manual
1=2047 PATTERN
2=511 PATTERN
3=STRESS PTRN #1
4=STRESS PTRN #2
5=STRESS PTRN #3
6=STRESS PTRN #4
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