Protection implemented by TOM and DCP boards


Intra-board 1+1 protection can be implemented when the TOM board works with the DCP board.

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.

Whether two NS2 boards are required for the ring protection of the TOM board
When ring protection is configured for services on the TOM board, if ODUk SNCP protection is configured, two NS2 boards are required to achieve dual feeding and selective receiving for routes in different directions.

Optical power difference between the working and protection trails on the DCP board to trigger protection switching
When the optical power difference between the working and protection trails exceeds a specified threshold, a POWER_DIFF_OVER alarm is reported and this alarm will trigger OLP protection switching. This threshold is configurable, and the default value is 5 dB.

Whether the intra-board 1+1 protection on the DCP board supports the revertive mode
No, it does not.

Switching time of protection configured using DCP boards
The DCP board can be used to configure inter-subrack 1+1 optical channel protection and extended intra-board wavelength protection. The protection switching time is less than 50 ms and meets the ITU-T standards.

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