Precautions for configuring the OTU+SCS protection mode

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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.

Other related questions:
ESC channel when intra-board 1+1 protection is configured using the OTU board (LDGD)
Question: For an LDGD board, only the status of the DCC channel on the first optical port is displayed when the DCC status is queried using command lines or queried on the NMS. Analysis: Although an OTU board that supports intra-board 1+1 protection has two optical ports on the WDM side, ECC information of only one optical port can be converted into electrical signals identified by the SCC board. This is because signals from the optical layer to the electrical layer are actually selectively received due to the intra-board 1+1 protection. This optical port may be optical port 1 or 2. The cm-get-newbdinfo command determines optical port 1 for output and does not distinguish the optical ports. Therefore, sometimes when the optical fiber is removed from optical port 1, DCC on optical port 1 is still normal according to a query result using the cm-get-newbdinfo command. Root cause: None Answer: Before querying the DCC status on an LDGD board, query the status of the intra-board 1+1 protection group and confirm the current working channel. The DCC status of optical port 1 as displayed on NMS or displayed using command lines, is the DCC status of the current working channel actually. Suggestion and conclusion: If no intra-board 1+1 protection is configured, services on optical port 2 cannot be selectively received, and the ESC channel on optical port also fails.

Principle and implementation mode of the OLP protection
The OLP protection uses the dual feeding and selective receiving function of the OLP boards and uses separate fibers for working and protection trails between adjacent sites to protect signals on the line.

What should be noted when using PoE power supplies
In the versions earlier than V100R005, all PoE power supplies are 250 W non-constant current power supplies. When two power supplies are used, they are used for power redundancy, but do not offer power. In V100R005 and later versions, PoE power supplies include 250 W and 500 W constant current power supplies. When two 250 W or 500 W constant current power supplies are used, the power supplies can be used for power redundancy and offer power at the same time. In V200R002 and later versions, PoE power supplies include 250 W, 500 W, 580 W, and 1150 W constant current power supplies. When two 580 W or 1150 W constant current power supplies are used, the power supplies can be used for power redundancy and offer power at the same time.

Method used to modify the SNCP protection mode
Question: SNCP protection uses the SNC/I mode, which processes only the SM overhead. When the SNC/I mode is used to protect pass-through services, there is a bug in this mode, and you need to change this mode to the SNC/N mode to protect trunk or pass-through services. Answer: 1. Convert SNC/I protection services into common cross-connections. 2. Enable PM non-intrusive monitoring. 3. Convert the common cross-connections into SNCP services.

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