Combined audio program and alarm signaling system with line supervision
First Claim
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9. A LINE FAULT SUPERVISION ARRANGEMENT IN A SIGNALING SYSTEM COMPRISING:
- A TWO-WIRE TELEPHONE LINE;
A FIRST DIRECT CURRENT SOURCE AT ONE END OF THE LINE FOR APPLYING A FIRST D.C SUPERVISORY CURRENT TO ONE WIRE OF THE LINE;
FIRST RESISTANCE MEANS AT THE OPPOSITE END OF SAID LINE TERMINATING SAID ONE WIRE TO GROUND FOR D.C.;
A SECOND DIRECT CURRENT SOURCE AT SAID ONE END OF THE LINE FOR APPLYING A SECOND D.C. SUPERVISORY CURRENT TO THE OTHER WIRE OF SAID LINE;
SECOND RESISTANCE MEANS AT THE OPPOSITE END OF SAID LINE TERMINATING SAID OTHER WIRE TO GROUND FOR D.C.;
AND MEANS AT SAID ONE END OF THE LINE OPERABLE IN RESPONSE TO AN ABNORMAL SUPERVISORY CURRENT IN EITHER WIRE TO INDICATE A FAULT ON THE LINE.
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16 Claims
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9. A LINE FAULT SUPERVISION ARRANGEMENT IN A SIGNALING SYSTEM COMPRISING:
- A TWO-WIRE TELEPHONE LINE;
A FIRST DIRECT CURRENT SOURCE AT ONE END OF THE LINE FOR APPLYING A FIRST D.C SUPERVISORY CURRENT TO ONE WIRE OF THE LINE;
FIRST RESISTANCE MEANS AT THE OPPOSITE END OF SAID LINE TERMINATING SAID ONE WIRE TO GROUND FOR D.C.;
A SECOND DIRECT CURRENT SOURCE AT SAID ONE END OF THE LINE FOR APPLYING A SECOND D.C. SUPERVISORY CURRENT TO THE OTHER WIRE OF SAID LINE;
SECOND RESISTANCE MEANS AT THE OPPOSITE END OF SAID LINE TERMINATING SAID OTHER WIRE TO GROUND FOR D.C.;
AND MEANS AT SAID ONE END OF THE LINE OPERABLE IN RESPONSE TO AN ABNORMAL SUPERVISORY CURRENT IN EITHER WIRE TO INDICATE A FAULT ON THE LINE.
- A TWO-WIRE TELEPHONE LINE;
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16. AN ALARM SIGNALING SYSTEM FOR SIGNALING AN ALARM FROM A REMOTE STATION TO A CENTRAL STATION, SAID SYSTEM COMPRISING:
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Current AssigneeRoss M. Heald
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Original AssigneeRoss M. Heald
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InventorsHeald, Ross M.
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Application NumberUS04/448,695Time in Patent Office1,243 DaysField of SearchUS Class Current379/33CPC Class CodesG08B 25/08 using communication transmi...
