Optical, Electrical Cross connection

Hello, friend!

Crossover is a logical connection. The programmable device is controlled by software to schedule signals. By configuring cross-connections, you can logically connect one or more boards to ensure that optical signals can pass through.

There are two types of cross-connections in the WDM system.

1. Electrical-layer cross-connection

It is used to logically connect the tributary board and the line board.

Electrical-layer cross-connections are also called electrical cross-connections. After receiving client-side signals, the tributary board converts them into ITU-T-compliant electrical signals. The electrical signals cannot directly reach the line board. Therefore, electrical cross-connections must be configured to logically connect the tributary board to the line board. Electrical-layer cross-connections are similar to bridges. A channel is established between tributary boards and line boards through which service electrical signals can pass.

2. Optical-layer cross-connection

It is used to create a channel that can pass through a specified wavelength on multiple optical-layer boards so that service signals can pass through.

Optical-layer cross-connections are also called optical cross-connections. The concept of optical cross-connections comes together with multiplexer/demultiplexer boards that can be configured with wavelengths. The WSM9/WSD9 boards can flexibly control the input/output wavelengths. Therefore, a logical configuration mode is required to correspond to this flexible control. A wavelength can pass through the WSM9/WSD9 board only after the optical cross-connection corresponding to the wavelength is configured.

In Huawei WDM systems, there are two types of optical cross-connections: board optical cross-connections and single-station optical cross-connections.

(1) Board optical cross-connections refer to board-level optical cross-connections configured for boards such as WSM9/WSD9. Even if optical cross-connections are used to connect the input and output of the same board.

(2) Single-NE optical cross-connections are NE-level optical cross-connections configured on the same optical NE. They are configured from one edge port on the local NE to another edge port, for example, from the input port on the M40 board to the output port on the FIU board.

Thanks!