scope:

This Technical Report describes the FTTX-network. As a guideline other parts of the fibre optic infrastructure are given in this clause. First some basics: sound, pictures, voice, data carried by networks are digital data expressed in terms of bit, bytes and their multiples (kilo (k), mega (M), giga (G), tera (T)). A bit (binary digit) is the smallest digital unit and has only two values: 0 or 1. A byte includes 8 bits and defines the size of a data file. Transmission capacity of networks and terminals is not expressed by using bytes, but using bit per second (bps). When a data file is transferred in a network two supplementary bits are necessary. It means that 10 bits are required for 1 byte.