Precautions for configuring the OTU+SCS protection mode

1. According to the WDM protection principles, single-fed and single-receiving OTU+SCS uses inter-board 1+1 protection, and the client-side multi-port OTU+SCS uses client 1+1 protection. When SF or SD is reported for one or more signals on the client side, client 1+1 protection switching is performed only for the involved signals. During protection switching, client-side signals at the receive end undergo protection switching, and WDM-side signals are not involved.
2. There are risks if inter-board 1+1 protection is configured for the multi-port OTU+SCS on the client side. That is, when SF or SD is reported for one or more client-side signals, protection switching cannot be normally triggered. For example, if the attenuation of a signal transmitted from the SCS to the client side exceeds the permitted range, the RLOS alarm may be reported on the client-side port but protection switching will not be triggered. As a result, services will be affected.
3. If inter-board 1+1 protection is falsely configured for the client-side multi-port OTU+SCS, modify the configuration by performing the following operations:
(1) Confirm that the current protection group is in normal state, disable the WDM-side laser on the OTU board on the protection channel at both the transmit and receive ends, and forcibly receive service signals of the working OTU.
(2) Delete the inter-board 1+1 protection group, and configure client 1+1 protection.
(3) Enable the WDM-side laser on the OTU board on the protection channel, and check whether the protection group is in normal state.

Scroll to top