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1152700 • Issue 1 • February 2001 • Section 2 Operations and Maintenance
Page 2-305
© 2000, ADC Telecommunications, Inc.
DLP-772
Page 1 of 4
LOOBACK TEST
Summary: This procedure instructs the operator in the steps required to perform loopback test
for the various interface types in the system. Loopbacks can be used to isolate network problems
or confirm continuity to customer equipment. A loopback will remain active if the user logs out
of the shelf.
1. From the GUI main screen, select the node that will have the loopback performed on it by
double clicking on it using the left mouse button. The shelf level GUI “Chassis View”
window appears similar to the one shown in Figure 772-1.
2. Select the card that will have the loopback performed on it by double clicking on it using
the left mouse button. The card level display will appear whether it is a 622 RIC, 155
SM/MM CRS, T3 CRS, etc. Refer to Figure 772-2 for an example.
3. Select a port to loopback if applicable.
4. Select the Loopback type of loopback to be performed using the radio buttons shown in the
window (None, Terminal, Facility, and/or Payload). Refer to Table 772-1 for definitions of
the loopback options for each card type. Figure 772-3 shows loopback signal
configurations.
5. Select the Apply button at the bottom of the screen to initiate the loopback.
6. Select the None option and Apply again to release the loopback.
Stop! You have completed this procedure.