ADTRAN 1202011L1, User Manual

Page: 103 / 162

Chapter 11. Testing and Troubleshooting
61202011L1-1 DSU III AR User Manual 11-19
Initiating
Follow the menu path outlined in Figure 11-12 to initiate a DTE Test
using a 511 Test Pattern.
Figure 11-12. Initiating a DTE Test with Test Pattern
Interpreting Test Results
If the unit is functioning properly, the DSU III AR displays:
DTE WITH TP
TST ERR=0000
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 accumulated by the test pattern detector.
If errors occur during this test, the test error count can be reset to
zero by pressing
1 on the keypad.
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 T
EST
E
RR
display.
1= DTE & LOOP (LL) 1= 2047 PATTERN
2= LOOP ONLY (RT) 2= 511 PATTERN
3= DTE ONLY 3= STRESS PTRN #1
1=LOCAL UNIT 4= DTE WITH TP 4= STRESS PTRN #2
5= TEST PATTERN 5= STRESS PTRN #3
2=TEST 6= SELF TEST 6= STRESS PTRN #4
2=REMOTE UNIT
Keypad Effect
1 Zeros error counter
2 Injects single Error