Setting a Loopback for an Ethernet Interface (RTN NEs)

You can set a loopback for an Ethernet interface by using the U2000 Web LCT. The Ethernet interface loopback is a common fault location method used to test and maintain the Ethernet board. The Ethernet interface loopback is used to test the fiber connections on the Ethernet board, physical and MAC layers of the Ethernet interface, and SDH layer (that is, the line).

Background Information

You can perform an inloop for an Ethernet interface by using the U2000 Web LCT.

When an inloop is used, the Ethernet signal transmitted by the NE is returned to the SDH layer at the Ethernet interface. See Figure 1. The physical layer inloop is used to test the MAC layer and the SDH layer. The MAC layer inloop is used to test the SDH layer.

Figure 1 Inloop

NOTICE:

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

NOTE:

The methods of performing a loopback for an Ethernet interface on U2000 Web LCT varies according to different board type. Please choose from the following two methods.

Procedure

Navigation Path 1:
1. In the NE Explorer, select a board and choose Configuration > Ethernet Interface Management > Ethernet Interface from the Function Tree.
2. Click the Basic Attributes tab.
3. Select an Ethernet interface from the list and double-click MAC Loopback or PHY Loopback to choose the loopback mode.
Navigation Path 2:
1. In the NE Explorer, select a board and choose Configuration > Interface Management > Ethernet Interface from the Function Tree.
2. Click Advanced Attributes tab.
3. Select an Ethernet interface from the list and double-click MAC Loopback or PHY Loopback to choose the loopback mode.
Click Apply and the U2000 Web LCT prompts that this operation may interrupt the service.
Click OK. A prompt is displayed indicating that the operation is successful. Click Close.