초록 ▼

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 whi

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.

대표청구항 ▼

[ I claim:] [1.] An arrangement comprising:a building occupied, at least at times, by human beings; the building having a first set of electrical terminals;a source of electrical power located outside of the building; the source having a second set of electrical terminals;a first set of conductors c

[ I claim:] [1.] An arrangement comprising:a building occupied, at least at times, by human beings; the building having a first set of electrical terminals;a source of electrical power located outside of the building; the source having a second set of electrical terminals;a first set of conductors connected between the first set of electrical terminals and the second set of electrical terminals;a master smoke alarm located within the building; the master smoke alarm having a set of master power input terminals connected with the second set of electrical terminals by way of a second set of conductors; the master smoke alarm being further characterized: (i) by having a set of master input/output terminals; (ii) by including a master siren operative to sound an alarm in the presence of smoke; and (iii) by including a master battery;plural slave smoke alarms located within the building; each slave smoke alarm being further characterized: (i) by having a set of slave input/output terminals; (ii) by including a slave siren operative to sound an alarm in the presence of smoke; and (iii) by not including a battery; anda third set of conductors connecting each set of slave input/output terminals with each other set of slave input/output terminals as well as with the set of master input/output terminals.