A TRANSMISSION SYSTEM

摘要

A transmission system, including a transmitter for transmitting data on a radio channel, and a modulator for receiving the data in a data stream and modulating the data for transmission by the transmitter, characterised by including a component for including n additional data channels in the data stream, where n is an integer. The component includes a controllable module for receiving and selectively outputting the additional channels, and a multiplexer for receiving the data stream and including the channels output by the module in said data stream for output to said modulator. The data stream is a 34 Mbit/s data stream, which can support E1, E2 and E3 data rates.