characterised by the transmission medium

Full Title

Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems > characterised by the transmission medium

Classification Context

Section:

PHYSICS

Class:

SIGNALLING

Subclass:

SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS

Child Classifications

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• G08B 25/04 using a single signalling line, e.g. in a closed loop
• G08B 25/06 using power transmission lines
• G08B 25/08 using communication transmission lines
• G08B 25/1 using wireless transmission systems