The FOtest`R DCT (duplex cable tester) manufactured by Fotec analyzes multimode fiber-optic cables used in local area networks and security systems. The device uses a measurement technique that allows simultaneous bidirectional loss measurements of two fibers and includes a full-duplex talkset for voice communications between test crews. The FOtalk talkset built into the instrument lets personnel communicate, compare results, and validate data. The combination of these features permits testing two fibers at both 850 and 1300 nanometers in both directions in less than one minute.
The FOtest`R DCT can also identify the wavelength of the source. The FOtest`R DCT kit costs $1600 and includes two instruments, which never need recalibration, a carrying case, and a FOtest`R visual fiber tracer.