Distributed splitter for data transmission over twisted wire pairs

• US 6,542,585 B2
• Filed: 04/18/2002
• Issued: 04/01/2003
• Est. Priority Date: 07/14/1989
• Status: Expired due to Fees

• Current Assignee: United Access Technologies LLC
• Original Assignee: Inline Connection Corporation
• Inventors: Goodman, David D.
• Primary Examiner(s): CHAN, WING F
• Application Number:
  US10/125,266
• Publication Number:
  US 20020110229A1
• Time in Patent Office: 348 Days
• Field of Search: 379/90.01, 379/102-1-1, 379/93.17, 379/93.26, 379/93.28, 379/93.37, 379/93.01, 348/14.01, 348/14-8-, 348/734
• US Class Current: 379/93.01
• CPC Class Codes: H04H 20/81 combined with telephone network over which the broadcast is continuously available
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data
• CPC Class Codes: H04N 7/104 Switchers or splitters
• CPC Class Codes: H04N 7/106 for domestic distribution
• CPC Class Codes: H04N 7/108 the cable being constituted by a pair of wires
• CPC Class Codes: H04N 7/147 Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals selecting H04Q
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

A system that provides video signal communication between a source of the video signal and a plurality of units that include destinations of the video signal includes an interface coupled to the source and to telephone lines, each of which serves at least one of the units and carries voice signals to and from one or more telephones coupled to the telephone line at said unit. The interface receives the video signal from the source, and transmits the received video signal onto at least one of the telephone lines in a selected frequency range that is different from frequencies at which the voice signals are carried on that telephone line. This causes the video signal to be coupled to a receiver which is connected to the telephone line at the unit served by that line and is adapted to recover the video signal from the telephone line and apply it to one or more of the destinations at the unit. The source is a cable (e.g., electrical or fibre optic) that is linked to the interface and that carries a plurality of video signals. The destinations are, e.g., televisions. The units can be residences (such as individual houses or apartments in an apartment building) or offices in an office building.

Claims

1. A system for communicating information between an external source of information and destinations of information each at a different one of a plurality of residences over a telephone wiring network used for passing telephone signals in a telephone voice band between telephone devices at the residences and a telephone exchange, comprising:

a plurality of transceivers, each located at a different one of the residences and coupled to a destination of information at said residence;

a signal interface located on the telephone wiring network between the telephone exchange and each of the residences;

a plurality of separate conductive paths, each coupling the signal interface and a different one of the plurality of transceivers and providing at least part of a path for telephone signals in the voice band between the telephone exchange and one or more of the telephone devices at the same residence as said transceiver, wherein each of said separate conductive paths exceeds 1000 feet in length;

at each of the residences at which one of the transceivers is located, a branch conductive path coupled at a location separated from said transceiver to the separate conductive path from the signal interface to said transceiver, said branch conductive path providing at least part of the path for telephone signals in the voice band between the telephone exchange and a telephone device at said residence; and

for each branch conductive path, a filter coupled between the branch conductive path and the corresponding telephone device;

wherein each transceiver includes circuitry for communicating with the signal interface in a high frequency band of frequencies above the highest frequency of the telephone voice band over the separate conductive path coupling said transceiver with the signal interface;

each of the filters that is coupled to a branch conductive path is configured for preventing signals in the high band of frequencies from passing to the telephone device coupled to said branch conductive path; and

the signal interface includes circuitry for receiving a plurality of external signals encoding information streams from the external source of information, circuitry for transmitting over the telephone wiring network to the transceivers a plurality of internal signals in the high frequency band encoding the information streams, and circuitry for limiting transmission of signals in the high frequency band from the telephone wiring network to the telephone exchange and for passing signals in the telephone frequency band between the telephone wiring network and the telephone exchange.

2. The system of claim 1 wherein each external signal includes a corresponding external data signal encoding a data stream and each internal signal includes a corresponding internal data signal encoding said data stream, and wherein the circuitry at each transceiver for communicating with the signal interface further includes circuitry for receiving the corresponding internal data signal and presenting said data stream to the destination of information.

3. The system of claim 1 wherein the circuitry at each transceiver for communicating with the signal interface includes circuitry for transmitting a control signal in the high frequency band to the signal interface.

4. The system of claim 1 wherein each of the filters that is coupled to a branch conductive path reflects substantially all of the energy in the high frequency band transmitting from said branch path, and the communication system includes circuitry for mitigating the effect of reflections so that said transceivers correctly receive internal signals from the signal interface.

5. The system of claim 4 wherein the circuitry for mitigating the effect of reflections includes circuitry connected to a branch conductive path that terminates high-frequency energy flowing along that path.

6. The system of claim 4 wherein the circuitry for mitigating the effect of reflections includes cooperative circuitry at the signal interface and at each transceiver.

7. The system of claim 4 wherein each of the transceivers includes signal processing circuitry for mitigating distortions of an internal signal introduced during transmission from the signal interface.

8. The system of claim 1 wherein the signal interface includes circuitry for selecting a subset of zero or more transceivers for receipt of each of the information streams accepted from the external source of information.

9. The system of claim 1 further comprising an RJ-11 jack coupled between one of the branch conductive paths and filter connected to said branch.