Channel-Loss Detector for Low-Traffic Teletype Circuits.

摘要

The report describes a prototype device for application at international flight service stations to detect teletype channel loss by providing an idle signal in the absence of messages and activating alarms when continuity is disrupted or a failure occurs which disables teletypewriter communication. Two units, each comprised of send and receive channel-loss detectors and teletypewriter circuit interfaces and associated alarms, were developed and evaluated at the National Aviation Facilities Experimental Center in accordance with Systems Research and Development Service, Washington, requirements and were found to perform satisfactorily. As a digital device, the channel-loss detector may lend itself to other communication applications as needed.