Hi there!
This time, I will share with you about optical layer loopback on WSS board.
Optical-layer loopback is performed to locate faults. Specifically, services are transmitted and received through the same WSS board, and a loopback is performed at the DM/AM layer or internal port layer of the WSS board.
Currently, optical-layer loopback can be implemented in two modes.
- Mode 1: Manually create physical fiber connections, loopback the DM and AM ports of the WSS board using optical fibers, and configure logical fiber connections and loopback from the DM port to the AM port on the NMS.
- Mode 2: Configure a software loopback on the NMS without any manual fiber loopback operation.
Mode 1
To implement the optical-layer loopback on the WSS board, you need to perform a fiber loopback on the DM and AM physical ports and configure the logical fiber connection and loopback function between the DM and AM ports on the NMS. By checking the service transmission and receiving on the OTU board, you can determine whether the optical line between the OTU and WSS boards is normal.
The loopback path on the WSS board is as follows: IN->DM->AM->OUT. After a loopback is configured, a LOOP_ALM alarm is generated on the IN port. The alarm is cleared only after all loopback configurations are deleted.
Application Scenario
The DWSS20 board is used as an example to describe manual optical-layer loopback via physical fiber connection.
Mode 2
The WSS modules of some boards have internal optical ports for loopback. Therefore, instead of performing fiber loopback on the DM and AM physical ports of the boards, you can directly configure software loopback on the NMS to avoid onsite operations.
Application Scenario
The ADC0824 board is used as an example to describe manual optical-layer loopback via physical fiber connection.
Related Information
Only some WSS boards support the optical-layer loopback function. For details, see the Hardware Description.
For details about the configuration guide and precautions, see the Alarm and Event Handling.
The above is from WDM Basics.
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Thank you！
