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An 8 tone, adaptive, synchronous system manufactured by Thrane & Thrane of Denmark. The system runs at 100bd or 200bd using 8 bit ASCII with data throughput of 300 or 600bps. Primarily designed to be connected directly to a serial port of a computer, the system features autodial, subscriber addressing, electronic mail and can be connected to a Fax machine. The full-duplex, error correcting (24 unit CRC) link protocol is completely transparent to any type of data coding. Used by French Diplo, UK Civil Aviation Authority (National Air Traffic System/NATS datalink, Prestwick/Reykjavik) and Algerian oil companies.
2 distinct modes have been monitored: tfc mode and an idling sequence. 8 tones, 200Hz spacing, ACF=8
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