Principle and implementation mode of the OLP protection

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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.

Other related questions:
OLP protection implemented by TN11OLP01 or TN12OLP01
OLP can be classified into OTS OLP protection and OMS OLP protection. Whether TN11OLP01 or TN12OLP01 boards can be used to form OLP depends on the input optical power values of optical ports RI1 and RI2 on OLP boards. If the input optical power values of both optical ports RI1 and RI2 on OLP boards do not exceed 7 dBm, TN11OLP01 or TN12OLP01 boards can be used to form OTS OLP protection. In the OMS OLP protection scenario, the input optical power values of optical ports RI1 and RI2 are prone to exceed the maximum optical power (+7 dBm) of the TN11OLP01 and TN11OLP02 boards. Therefore, TN11OLP01 or TN12OLP01 boards cannot be used in this scenario.

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.

Whether TN12OLP03 boards can implement OLP protection in the OSN 6800
TN12OLP03 boards support single-mode optical fibers and mainly apply to scenarios with large optical power values. The TN12OLP03 boards support client 1+1 protection, intra-board 1+1 protection, and OLP protection.

WTR period of OLP protection
The OLP board supports optical line protection, intra-board 1+1 protection, and client 1+1 protection. If the reversion mode is revertive, the default WTR period is 10 minutes.

WTR time of OLP protection
The OLP board supports optical line protection, intra-board 1+1 protection, and client 1+1 protection. If the reversion mode is revertive, the default WTR period is 10 minutes.

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