Signalling of tampering with the line circuit

Full Title

Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation > Monitoring continuously signalling or alarm systems > Monitoring of the line circuits, e.g. signalling of line faults > Signalling of tampering with the line circuit

Classification Context

Section:

PHYSICS

Class:

SIGNALLING

Subclass:

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