The main functions of the OSF (and mounted subracks) 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.
The single sided Optical Suite Frame (OSF) is generally located at the end of a suite of optical equipment racks, and feeds the optical equipment using long length patch cords. The patch cords run in the overhead ducting system. These patch cords are managed in an orderly and effective way in the top half of the OSF. They travel from 6 x 2RU subracks, that are housed in the lower half of the OSF. The OSF has a fibre count of 6 x 72 = 432 fibres; or 6 x 96 = 576 fibres. The MBR of every optical fibre cord is maintained at 30mm throughout.
One subrack is provided initially, with the remainder added with growth over time.
A major feature of the subrack is the minimum amount of movement that occurs to loose tubes and optical fibre cords, as the subrack 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.
Allows for orderly growth over time, for up to 432 or 576 optical fibres Cross patching available on some OSF’s