characterised by the transmission medium

Introduced: January 1990

Last revised: January 2006

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

4 direct subcodes

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