This subrack is typically used in High-Density Optical Fibre Termination situations.
The main functions of the subrack are to provide: a managed standard fibre installation, reticulation, interconnection, distribution, re-arrangement and maintenance activities at a common point. It also allows for fibre testing and fault-finding activities. Typically, an external optical fibre cable is fusion spliced to pigtails, which are connected to patch cords. Typically, the patch cords can cross-connect (in an FTF) or connect to transmission equipment.
A major feature of this subrack is the minimum amount of movement that occurs to loose tubes and optical fibre cords, as the tray opens and closes. This ensures a very high degree of protection for working services. Also, the fusion splices and pigtails are located in a protected position, because there is very little chance of them being disturbed when patch cords are being installed, as the subracks tray only needs to be opened a very small amount.