Wideband (or broadband) signals are normally intercepted from satellites or tapped cables in the form of multiplex microwave or high frequency signals. The first step in processing such signals for Comint purposes is "wideband extraction". An extensive range of Sigint equipment is manufactured for this purpose, enabling newly intercepted systems to be surveyed and analysed. These include transponder survey equipment which identify and classify satellite downlinks, demodulators, decoders, demultiplexers, microwave radio link analysers, link survey units, carrier analysis systems, and many other forms of hardware and software.