Inter-subrack wavelength protection connection between the LWF and OLP boards

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TI/R0 is connected to the client side, TO1/RI1 is connected to the client side of the working LWF, and TO2/RI2 is connected to the client side of the protection LWF.

Other related questions:
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.

Methods for checking the wavelength on LWFS boards.
You can run the cfg-get-wavelength command to check the wavelength.

Whether LOG boards can work with OLP boards to form protection between different channels
Yes. LOG boards can work with OLP boards to form extended intra-board 1+1 protection or client 1+1 protection.

Whether the working and protection channels must be fixed when the OLP board is used to configure OLP protection
When the OLP board is used to configure OLP protection, the working channel must be the optical port 1 (RI1/TO1) of the OLP board and the protection channel must be set to optical port 2 (RI2/TO2). Otherwise, the OLP protection group cannot work normally.

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