You can set a loopback for an OTU.
Background Information
The support for loopback functions depends on equipment types. For details, refer to the specific equipment manuals.
The OTU loopback can be set to an outloop or an inloop.
- Outloop: The received signal at the local end is looped back to its transmit port directly without any change in its signal structure. An outloop is used to test the optical line and the connector.
Table 1 Outloop Type
Illustration
Client-side OTU outloop
WDM-side OTU outloop
- Inloop: The processed signal is transmitted from the transmit port at the local end and then looped back to the receive port still at the local end. An inloop is used to test the signal processing on the board.
Table 2 Inloop Type
Illustration
Client-side OTU inloop
WDM-side OTU 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 a board and choose from the Function Tree.
- Select By Function. The default is By Board/Port (Channel).
- Select one OTU. Double-click the loopback parameter to select the loopback mode.
- Click Apply. In the dialog box that is displayed, click OK. Another dialog box is displayed, asking you whether to proceed. Click OK again.
- Optional: Click Query to query loopback record data.