Stations for a digital communications network.

摘要

A central station (4) for a digital communications network, arranged to transmit data to outstations (8) in the form of a stream of frames, each frame comprising a first portion containing a synchronisation signal and housekeeping data for the outstations, the central station (4) comprising a first scrambling means arranged to scramble the contents of said first portions in accordance with a first predetermined binary sequence, and a second scrambling means arranged to scramble the contents of said second portions in accordance with a second predetermined binary sequence.