COMMUNICATION CHANNEL

A communication channel for conveying quasi-static signals representing several alternative states one of which is potentially unsafe, e.g. the control signal for a signal lamp in a railway control system. Each channel has a signature code which is continuously repeated in different forms, e.g. non-...

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Bibliographische Detailangaben
Hauptverfasser:	CORRIE, JOHN DOUGLAS, TOOLEY, MARK ARTHUR
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ENSURING THE SAFETY OF RAILWAY TRAFFIC GUIDING RAILWAY TRAFFIC PERFORMING OPERATIONS RAILWAYS TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION TRANSPORTING
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Beschreibung
Zusammenfassung:	A communication channel for conveying quasi-static signals representing several alternative states one of which is potentially unsafe, e.g. the control signal for a signal lamp in a railway control system. Each channel has a signature code which is continuously repeated in different forms, e.g. non-inverted, inverted, or alternately inverted and non-inverted, to represent different states. When a potentially unsafe state is indicated, the repeated signature is periodically corrupted according to a predetermined error pattern. The channel receiver is arranged such that its output (32,34) can only be held in the unsafe state providing both the signature and the error pattern in the received signal are correct.