Glossary F

F1 byte

It is the user path byte, which is reserved for the user but usually it is special for network providers. It is mainly used to provide the temporary data/voice path for special maintenance Objectives. It belongs to the regenerator section overhead byte.

F2, F3 bytes

They are the path user channel bytes. These two bytes provide the user with the communication between path units related to payload. They belong to the higher order path overhead byte.

Fiber/Cable

Fiber & Cable is the general name of optical fiber and cable. It refers to the physical entities that connect the transmission equipment, carry transmission objects (user information and network management information) and perform transmission function in the transmission network. The optical fiber transmits optical signal, while the cable transmits electrical signal. The fiber/cable between NEs represents the optical fiber connection or cable connection between NEs. The fiber/cable between SDH NEs represents the connection relation between NEs. At this time, the fiber/cable is of optical fiber type.

Forced switch

It is to forcedly switch the service to the protection board. Even though the protecting board is faulty, the switching will still occur.

Forced switch

This function forces the service to switch from the working channel to the protection channel, with the service not to be restored automatically.

Forecast laser performance

It is to forecast the laser performance within a certain period of time on the basis of the collected laser performance data and according to a certain performance model so that you can replace the laser in time if necessary. The forecast can be roughly divided into two types: 1. Forecast the bias current, input optical power and output optical power at a moment in future; 2. Forecast the period of time which is taken for the bias current, input optical power and output optical power to reach the specified value.

Full duplex

On the communication link, both parties can send and receive data at the same time.

Full filtering trail

In this search mode, the NM first deletes all the trail data on the NM side and reserves the service configuration data of respective NEs, and then re-searches the service configuration data of respective NEs on the NM side to form the new trail information and report it to the NM client.

Full mode

In the full searching mode, all the trail information at the NM side will be deleted first (but the service configuration information of respective NEs is saved at the NM side). Then the service configuration information of respective NEs at the NM side is re-searched to form the trail information in the network.

Full search

In the full search mode, all the trail information on the NM side will be deleted first (Only the trail information at the network layer on the NM side are deleted, while the service configuration information of NE in NE layer on the NM side and on the NE side still remain). Then the service configuration information of respective NEs in the NE layer on the NM side is re-searched to form the trail information in the network layer on the NM side.

Full search

In the incremental search mode, all the trail information on the NM side will be deleted first (Only the trail information at the network layer on the NM side is deleted, while the service configuration information of NE in NE layer on the NM side and on the NE side still remain). Then the service configuration information of respective NEs in the NE layer on the NM side is re-searched to form the trail information in the network layer on the NM side.