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TESTS
DS1 Self-Test
4-16
DS1 Self-Test (ST) causes the CSU to generate and verify a test pattern.
The test pattern is selected via option switch S5-4 or the Supervisory ter-
minal. DS1 Self-Test can be used with DS1 Local Test (refer to DS1 Local
Test with Self-Test), DS1 Remote Test (refer to DS1 Remote Test with Self-
Test) or DS1 Network Interface Loopback (refer to DS1 Network Interface
Loopback with Self-Test) to test one CSU, or alone as a DS1 End-to-End
Self-Test.
DS1 End-to-End Self-Test, illustrated in Figure 4-14, tests both CSUs and
the T1 link by transmitting a local CSU-generated test pattern to the re-
mote CSU for verification, and vice versa. (Bipolar violations are cor-
rected during this test.) Within each CSU, a Test Pattern Generator cre-
ates the test pattern, and a Test Pattern Recognizer determines if the data
it receives matches that which was transmitted.
To properly perform DS1 End-to-End Self-Test, both
CSUs must be optioned for the same test pattern.
DS1 End-to-End Self-Test can be controlled via front panel switch ST or
the Supervisory terminal Self Test at each CSU. To perform this test, refer
to Table 4-8.
TABLE 4-8. DS1 END-TO-END SELF-TEST
Step
Front Panel Control
1.
To prevent data loss, suspend operation of all associated digital-terminating
equipment.
2.
Engage the ST switches on both
CSUs. The TM indicators should be lit
during the test.
3.
Monitor the ERR/ALM indicator. If it
blinks, a problem exists.
4.
To stop the test, disengage both ST
switches.
NOTE
Supervisory Terminal Control
Initiate Self Test (on the SELF TEST
screen) at both CSUs.
Monitor Test Results for the averaged
BER. A high BER indicates that a
problem exists.
To stop the test, terminate Self-Test at
both CSUs.
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