Glossary W

Wavelength path protection ring

The wavelength path protection ring comprises the working ring and the protection ring. Service signals are transmitted in the two rings in opposite directions. In the wavelength path protection ring, service signals from one node (such as node A) to another node (such as node C) are transmitted via the working ring and the protection ring at one time. Node C receives the signals from the two rings at the same time and selects the signal with higher quality. Similarly, the signals from Node C to Node A are transmitted along both the working ring and protective ring, and Node A selects the signal with higher quality. Wavelength path protection can protect optical fibers and equipment. It provides protection against optical fiber damages, wavelength conversion board failure, optical module failure, and optical amplifier failure. The restore time is less than 50ms.

Wavelength protection group

The wavelength protection group is important to describe the wavelength protection structure. Its function is similar to that of the protection sub-network in the SDH NE. The wavelength path protection can only work with the correct configuration of the wavelength protection group.

Wavelength protection sub-network

A wavelength protection sub-network is a ring-chain structure used to describe wavelength protection, it is the basic network-level information. With the function similar to that of the protection sub-network in an SDH network, it is the basic network-level data oriented to the user. Create or delete a protection sub-network as required and set the parameters of the protection sub-network for the purpose of management on the network hierarchy.

WDM path protection

At the place where the signals are input to the DWDM equipment, the same channel of optical signals are input to two boards/ports of the WDM equipment respectively via two optical fibers. The two boards/ports are backed up mutually. When faults occur on the active path, the input terminal of the DWDM equipment will switch over to the standby path. This is the path protection switching function. If the detection shows that the active path signal recovers, the input terminal of the DWDM equipment will switch back to the active path when it meets the setting requirement. This is the path protection switching recovery function.