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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Troubleshooting
6-19Troubleshooting ATM-PNC
6
Connected through a DSU/CSU
To troubleshoot synchronization problems in systems where the synchronization
signal connects through a Data Service Unit (DSU) or Channel Service Unit
(CSU), follow the procedures in Table 6-8
.
Use this table if the
■ DTE or RLB loopback tests fail
■ CSU or DSU/CSU does not return to normal service
Table 6-8. Troubleshooting 400A T1 synchronization (through a DSU/CSU)
√ Step Action Description
1. If DSU/CSU does not
go back to normal
operation
Verify that the current line compensation settings on the
DS1 circuit pack (change board) match the DTE
equalization settings of the CSU or DSU/CSU for the length
of cable:
2. Go through readout
steps
On the 316X CSU or DSU/CSU, press the double-up arrow.
3. Continue Press the button under the “Config” readout
4. Continue Press the button under the “Activ.” readout
5. Continue Press the button under the “Edit.” readout
6. Continue Press the button under the “DTE.” readout
7. Continue Press the button under the “Next” readout until
“Equalization” displays. The top line of the display shows
the current settings.
8. Verify settings If these settings do not agree with the DS1 administration
(step 1), enter the correct settings and retest.
If the test still fails, continue.
9. Increase equalization
settings
Increase the equalization settings on the CSU or DSU/CSU
by one value.
10. Go through readout
steps
Press the right-arrow button until “Value” displays. For
example, if 0 through 133 displays, go to 133 through 266,
and so on.
11. Continue Press the double-up arrow.
12. Continue Press the button under the “Yes” readout when asked to
save options.
13. Continue Press the button under the “Active” readout when asked
where to save the options.
“Command Complete” displays.
14. Retest Retest
Continued on next page