Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1993-12-15
1999-12-07
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340510, 340533, 340538, 340628, 379 37, G08B 2900
Patent
active
059990945
ABSTRACT:
An in-building telephone distribution system has a multi-conductor telephone distribution cable, starting at the point where the telephone utility lines enter the building and extending from there to each location at which a telephone outlet is wanted, at which a smoke alarm is wanted, and/or at which one of numerous other devices (e.g., door chime) might be wanted. At a suitable point along the cable, a first pair of the cable's conductors is connected with the power output terminals of a Class-2 (or Class-2-equivalent) DC power supply, whose power input terminals are connected with an ordinary electric utility power line. Thus, at any point along the cable, the first pair of conductors may be accessed and used as a Class-2 DC power source. A second pair of the cable's distribution conductors is used for distribution of the telephone signals. Each telephone outlet is connected with the second pair of conductors for telephone signals and with the first pair of conductors for Class-2 DC power; which Class-2 DC power is used for powering those telephone instruments requiring DC power, such as cord-less telephones, telephone answering machines, fax machines, modems, etc. A third pair of conductors is used for smoke alarm signals and is therefore connected with each smoke alarm; each of which is also connected with the first pair of conductors so as to have access to Class-2 DC power.
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