Setting a Loopback for an IF Interface

You can to set loopback for an intermediate frequency (IF) interface by using the U2000 Web LCT. The IF interface loopback is a commonly used way of fault location during the test and maintenance of the IF boards. By performing loopback for an IF interface, the system can determine whether the IF interface and the fibers (cables) connected to the IF board are normal and whether the IF board service processing module and the cross-connect board are normal.

Context

IF interface loopback can be set to an outloop or an inloop.

When an outloop is used, the IF service received by NE is returned at the IF interface. See Figure 1. An outloop can be used to test the IF interface and the fibers or cables connected to the IF interface.
Figure 1 Outloop
When an inloop is used, the IF service transmitted by NE is returned to the cross-connect board at the IF interface. See Figure 2. An inloop can be used to test the IF board service processing module and the cross-connect board.
Figure 2 Inloop

NOTICE:

As a loopback interrupts services, it is only used for fault location and must be released after the fault is removed.

Procedure

In the NE Explorer, select an IF board and choose Configuration > IF Interface from the Function Tree.
Select IF Port Loopback.
Select an IF interface from the list and double-click IF Port Loopback to select a loopback mode.
Click Apply and the Confirm dialog box is displayed.
Click OK. A prompt is displayed indicating that the operation is successful.
Click Close.