ADTRAN 1200063L1, Manual

Page: 61 / 137

Chapter 4. Testing and Troubleshooting
61200063L1-20 DSU III TDM User Manual 4-17
Test Purpose
A
T
EST
P
ATTERN
test has the following purposes:
• Transmits user-selected test pattern using an internal test pattern gen-
erator and compares the received data using internal test pattern de-
tector to detect whether there are any errors on the DDS circuit.
• Injects errors and verifies the unit transmits data across the communi-
cation circuit to the remote unit.
• Helps determine from which direction the circuit is receiving errors.
Initiating
Follow the menu path outlined in Figure 4-14 to initiate a test using a test
pattern.
Figure 4-14. Initiating a Test Using a Test Pattern
Interpreting Test Results
During this test, the display should show the following:
TST ERR = 00
1=DTE & LOOP(LL) 1=2047 PATTERN
2=LOOP ONLY (RT) 2=511 PATTERN
3=DTE ONLY 3=STRESS PTRN #1
4=DTE WITH TP 4=STRESS PTRN #2
1=LOCAL UNIT 5=TEST PATTERN 5=STRESS PTRN #3
2=TEST 6=SELF TEST 6=STRESS PTRN #4
2=REMOTE UNIT
3=DBU CONNECTION