Huawei OptiX OSN 2500 Supporting Tasks of Software Loopback

Outloop
The SDH optical interface board, PDH electrical interface board, Ethernet interface board like Huawei EGS4  and ATM board all support outloop.

Inloop
The SDH optical interface board like Huawei SLD64, PDH electrical interface board, Ethernet interface board and ATM board all support inloop

Loopback at an SDH Interface
Prerequisites
You must be an NE user with "NE and network operator" authority or higher.
To test whether the interface module and external cables of a board are normal, you need to set
an outloop.
To test whether the cross-connect unit and service path of the equipment are normal, you need
to set an inloop.
Impact on Services
In the case of non-protection, the loopback may interrupt the services or the communication
signals.
Tools/Instruments
T2000
Procedure
Step 1 In the Main Topology of the T2000, select the NE to be looped back.
Step 2 Right-click the NE icon in the Main Topology and select NE Explorer.
Step 3 Select the board from the Object Tree and select Configuration > SDH Interface from the
Function Tree.
Step 4 Select By Function. Select Optical (Electrical) Interface Loopback.
Step 5 Select the port and select the loopback mode Inloop or Outloop.
Step 6 Click Apply. The confirm dialog box is displayed. Click OK.
Step 7 The Operation Result dialog box is displayed and indicates that the operation is successful.
Click Close.
This article works for Huawei OptiX OSN 2500 (V100R008)