Chauvin Arnoux CA 7028 [P01129501] Networks, Telecom Cable Tester. The CA 7028 WIRE MAPPER™ is a professional cable testing and error detection device for local data and voice networks with multi-pair copper wires. With its complete range of functions, it is an indispensable tool for all engineers and technicians who are responsible for the installation and maintenance of networks. The C.A 7028 WIRE MAPPER™ is also a useful test device for all network managers who want to search for errors in computer networks or extend an existing network. With EDT™ (End Discrimination Technology), the device has a unique new function: The detection of the cable termination. This feature saves significant time and money when testing cable networks by displaying the wiring diagram graphically on the device display and clearly showing the nature of the detected fault and its location. Up to 9 identifiers are available as accessories - this allows the device to check up to 9 connections from the distribution board.