Lucent Technologies Comcode 108678723 manual Connected through a DSU/CSU

DEFINITY ECS Release 8.2 ATM Installation,	Issue 1
Upgrades, and Administration 555-233-124	April 2000
6 Troubleshooting
Troubleshooting ATM-PNC	6-19

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	On the 316X CSU or DSU/CSU, press the double-up arrow.
	steps
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	Increase the equalization settings on the CSU or DSU/CSU
	settings	by one value.
10.	Go through readout	Press the right-arrow button until “Value” displays. For
	steps	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