Telephone line integrity monitoring system
AssigneePyronix Limited
InventorsAndrew James Drysdale, Juan Sebastian Herrera
Life of this patent
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Abstract
A system for monitoring for integrity of a telephone line connected between a central monitoring station and a subscriber's equipment which comprises a first module for initiating transmission of an identification code from the subscriber's equipment along the telephone line to be monitored to the central monitoring station during an incoming ringing signal; a recognition module response to said transmitted identification code for recognizing the identification code; and a second module for dropping the line after said transmitted identification codes has been recognized and before the line has been picked up.
Claims22
An alarm system comprising:
- telephone line integrity monitoring means for monitoring the integrity of a telephone line connection between a first piece of equipment and a subscriber's equipment including
- means for initiating transmission of an identification code from the subscriber's equipment along the telephone line to be monitored to the first piece of equipment during an incoming ringing signal;
- recognition means responsive to the transmitted identification code for recognizing the identification code;
- and
- means for dropping the line after the transmitted identification code has been transmitted and before the line has been picked up.
A system according to any one of the proceding claims, in which the subscriber's equipment comprises an intruder detection alarm.
A method of monitoring the integrity of a telephone line connection between a first piece of equipment and a subscriber's equipment which comprises:
- initiating transmission of an identification code by means of the subscriber's equipment along the telephone line to be monitored to the first piece of equipment during an incoming ringing signal;
- recognising the identification code by means of recognition means at the first piece of equipment;
- and
- dropping the line after said transmitted identification code has been recognised and before the line has been picked up.
Dependencies are inferred from the claim text.