Tecpro
Tecpro is a 'two wire' or as it is sometimes known 'party-line' or 'ring' system which enables a number of people to take part in the same conversation. Each participant can hear all other participants on the same circuit while being able to talk to them simultaneously, so a full 'duplex' conversation can take place – similar to a telephone system. For further info see the Tecpro communication system overview.