Principles for inter-board OLP or DCP protection

The OLP and DCP boards have the same functions and implementation modes. A DCP board has two optical ports, which can emit four light signals. Therefore, one DCP board functions as two OLP boards. The following uses OLP as an example.
1. OLP applies to line protection.
[Application scope]: An OLP board is a 1+1 optical line protection board and implements 1+1 protection for optical line signals.
[Working principle]: In a DWDM system, the transmit-end FIU board transmits light to the OLP board so that it is split at a ratio of 1:1. The two channels of split light are transmitted to the working fiber (channel) and protection fiber (channel) respectively. At the receive end, the OLP board detects and compares the optical power of the light on the working and protection channels. Based on the protection switching conditions, the OLP board determines whether to enable the optical switch to protect fiber routes and the services carried on the fiber routes.
2. OLP applies to client protection.
[Application scope]: OLP is used for client protection.
[Working principle]:
(1) An OTU board detects an abnormality and reports a message to the system control board.
(2) The message is sent from the OTU board to the system control board.
(3) The system control board responds to the interrupt request (Fast_Int) of the OTU board and issues a command to request to shut down the client-side laser of the OTU board.
(4) The command is sent from the system control board to the OTU board.
(5) The OTU board receives the command and shuts down the client-side laser.
(6) The OLP board detects and compares the optical power of the light on the working and protection channels. After detecting an optical power change, the OLP board switches the route.

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