Telephone extension system utilizing power line carrier signals

Claim 1

A method of electrically coupling telephone signals on a telephone line to a conventional extension telephone having four or less wires, three of which are the tip, ring, or ground wires utilizing available electrical power lines having power outlets along the power lines comprising the steps of: (a) coupling the tip and ring wires from the telephone line to a master linking circuit; (b) coupling the master linking circuit to a first power line outlet; (c) coupling an extension linking circuit to a second power line outlet; (d) coupling a conventional extension telephone having tip and ring lines to the extension linking circuit; (e) said master linking circuits performing the following steps: (i) coupling telephone signals on the tip line to a transmitter for transmission in a first direction over said power line to said extension linking circuits; (ii) receiving signals in a receiver from the extension linking circuits for transmission in a second direction to the telephone line; (f) said extension linking circuits performing the following steps: (i) coupling telephone signals on the tip line of the extension telephone to a transmitter for transmission in said second direction over said power line to said receiver in said master linking circuits; (ii) receiving signals in a receiver from the transmitter in the master linking circuits for transmission in said first direction to the extension telephone over the tip and ring lines.

Claim 2

A method of electrically coupling telephone signals on a telephone line to a conventional extension telephone having four or less wires, three of which are the tip, ring, or ground wires utilizing available electrical power lines having power outlets along the power lines comprising the steps of: (a) coupling the tip and ring wires from the telephone line to a master linking circuit; (b) coupling the master linking circuit to a first power line outlet; (c) coupling an extension linking circuit to a second power line outlet; (d) coupling a conventional extension telephone having tip and ring lines to the extension linking circuit; (e) said master linking circuits performing the following steps: (i) coupling telephone signals on the tip line to a transmitter for transmission in a first direction over said power line to said extension linking circuits; (ii) receiving signals in a receiver from the extension linking circuits for transmission in a second direction to the telephone line; (f) said extension linking circuits performing the following steps: (i) coupling telephone signals on the tip line of the extension telephone to a transmitter for transmission in said second direction over said power line to said receiver in said master linking circuits; (ii) receiving signals in a receiver from the transmitter in the master linking circuits for transmission in said first direction to the extension telephone over the tip and ring lines.

Claim 4

A method of carrying electrical telephone signals between a subscriber's telephone line of a conventional telephone communication system and the subscriber's conventional extension telephone, wherein said conventional telephone line has four or less wires connected to it of which one is a tip wire, one a ring wire and one a ground wire, over available electric power wires, comprising the steps of: (a) providing a master location including master linking circuits for processing the telephone signals by electrically coupling the telephone signals from the subscriber's telephone line to the power wires; (b) providing an extension location along said power wires including said conventional extension telephone and extension linking circuits for processing the telephone signals, by electrically coupling the extension telephone to the power wires; (c) originating an extension telephone off-cradle signal at the extension telephone; (d) at the master location detecting the edges of said cradle-off signal and producing a signal level representative thereof and switching the master linking circuits to the telephone line in response to said signal level representative of cradle-off; (e) at said extension location generating pulses that define, make or break intervals; and (f) detecting both the leading and trailing edges of the the dial pulses and (i) generating pulses shorter than the break interval between said edges of the dial pulse, (ii) generating pulses longer than said break interval between said edges of the dial pulse, (iii) producing pulses coincident with said shorter and longer pulses, and (iv) applying aid coincident pulses to a monostable multivibrator.

Claim 5

A method of carrying electrical telephone signals between a subscriber's telephone line of a conventional telephone communication system and the subscriber's conventional extension telephone, wherein said conventional telephone line has four or less wires connected to it of which one is a tip wire, one a ring wire and one a ground wire, over available electric power wires, comprising the steps of: (a) providing a master location including master linking circuits for processing the telephone signals by electrically coupling the telephone signals from the subscriber's telephone line to the power wires; (b) providing an extension location along said power wires including said conventional extension telephone and extension linking circuits for processing the telephone signals, by electrically coupling the extension telephone to the power wires; (c) originating an extension telephone off-cradle signal at the extension telephone; (d) at the master location detecting the edges of said cradle-off signal and producing a signal level representative thereof and switching the master linking circuits to the telephone line in response to said signal level representative of cradle-off; (e) at said extension location generating pulses that define, make or break intervals; and (f) detecting both the leading and trailing edges of the the dial pulses and (i) generating pulses shorter than the break interval between said edges of the dial pulse, (ii) generating pulses longer than said break interval between said edges of the dial pulse, (iii) producing pulses coincident with said shorter and longer pulses, and (iv) applying aid coincident pulses to a monostable multivibrator.