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DS0 Self-Test
DS0 Self-Test causes the CSU to generate and verify a test pattern on the
selected channel. The test pattern is selected via the Supervisory termi-
nal. DS0 Self-Test can be used with DS0 Remote Test (refer to DS0 Remote
Test with Self-Test) to test primarily the T1 link and the remote CSU, or
alone as DS0 End-to-End Self-Test to also test the local CSU.
DS0 End-to-End Self-Test, illustrated in Figure 4-19, tests both CSUs and
the T1 link by transmitting, on the selected channel, a local CSU-gener-
ated test pattern to the remote CSU for verification, and vice versa.
(Bipolar violations are corrected during this test.) Within each CSU, a
Test Pattern Generator creates the test pattern, and a Test Pattern Recog-
nizer determines if the data it receives matches that which was transmit-
ted.
To properly perform DS0 End-to-End Self-Test, you
must select the same channel and test pattern at both
CSUs.
To perform this test, refer to Table 4-13.
TABLE 4-13. DS0 END-TO-END SELF-TEST
Step
1.
To prevent data loss, suspend operation of all associated digital-terminating
equipment on the channel to be tested.
2.
At the remote CSU, select the desired channel and test pattern, select BIT
ERROR TEST mode, and then initiate the test (all on the DS0 DIAGNOSTICS
screen). The front panel TM indicator should light and the status line ST
indicator should come on.
3.
At the local CSU, select the same channel and test pattern, select BIT ERROR
TEST mode, and then initiate the test (all on the DS0 DIAGNOSTICS screen).
The front panel TM indicator should light and the status line ST indicator should
come on.
4.
At the local CSU, any errors for the remote-to-local leg are displayed in its
Cumulative Errors field and its front panel ERR/ALM indicator lights. At the
remote CSU, any errors for the local-to-remote leg are displayed in its Cumu-
lative Errors field and its front panel ERR/ALM indicator lights. A high error
count indicates that a problem exists.
5.
To stop the test, terminate the tests at both CSUs.
NOTE
Supervisory Terminal Control
TESTS
4-23
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