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TESTS
DS0 Remote Test
with Self-Test
EQUIPMENT
TPG = TEST PATTERN GENERATOR
FIGURE 4-18. DS0 REMOTE TEST WITH SELF-TEST
4-22
DS0 Remote Test with Self-Test, illustrated in Figure 4-18, tests both CSUs
and the T1 link by transmitting, on the selected channel, a local CSU-
generated test pattern to the remote CSU and looping it back for verifica-
tion. The test pattern is selected via the Supervisory terminal. Within the
local CSU, a Test Pattern Generator creates the test pattern, and a Test
Pattern Recognizer determines if the data it receives matches that which
was transmitted.
To perform this test, refer to Table 4-12.
TABLE 4-12. DS0 REMOTE TEST WITH 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, select LOOPBACK mode, and
then initiate the test (all on the DS0 DIAGNOSTICS screen). The status line
DS0LB indicator should come on.
3.
At the local CSU, select the test pattern and the same channel, 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 are displayed the Cumulative Errors field and the
front panel ERR/ALM indicator lights. A high error count indicates that a
problem exists.
5.
To stop the test, terminate BIT ERROR TEST and then LOOPBACK.
TPR
TPG
LOCAL CSU
TPR = TEST PATTERN RECOGNIZER
Supervisory Terminal Control
T1
NETWORK
REMOTE CSU
SELECTED CHANNEL
EQUIPMENT
ONLY THE
IS AFFECTED
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