CA2136603A1 - Television Signal Distribution Network - Google Patents

Television Signal Distribution Network

Info

Publication number
CA2136603A1
CA2136603A1 CA2136603A CA2136603A CA2136603A1 CA 2136603 A1 CA2136603 A1 CA 2136603A1 CA 2136603 A CA2136603 A CA 2136603A CA 2136603 A CA2136603 A CA 2136603A CA 2136603 A1 CA2136603 A1 CA 2136603A1
Authority
CA
Canada
Prior art keywords
signals
customer premises
drop unit
bpsk
upstream
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2136603A
Other languages
French (fr)
Other versions
CA2136603C (en
Inventor
John Brian Terry
Alastair Anthony Warwick
Carl William Craig Anderson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2136603A1 publication Critical patent/CA2136603A1/en
Application granted granted Critical
Publication of CA2136603C publication Critical patent/CA2136603C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Optical Communication System (AREA)

Abstract

A cable television network is supplemented with optical fibers and fiber termination units to communicate additional downstream digital signals and upstream signals. A drop unit for each customer premises is provided in the drop cable.
The drop unit demodulates downstream signals and selects for delivery to the customer premises only those downstream signals addressed to the customer premises, modulating the selected signals using binary phase shift keying (BPSK) which provides relative immunity to noise for forwarding the signals to the customer premises.
Upstream BPSK
signals from the customer premises are demodulated and remodulated in the drop unit to isolate the customer premises wiring from the rest of the network.
CA002136603A 1993-12-30 1994-11-24 Television signal distribution network Expired - Fee Related CA2136603C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/175,455 US5408259A (en) 1993-12-30 1993-12-30 Data modulation arrangement for selectively distributing data
US08/175,455 1993-12-30

Publications (2)

Publication Number Publication Date
CA2136603A1 true CA2136603A1 (en) 1995-07-01
CA2136603C CA2136603C (en) 1999-08-03

Family

ID=22640278

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002136603A Expired - Fee Related CA2136603C (en) 1993-12-30 1994-11-24 Television signal distribution network
CA002177163A Expired - Fee Related CA2177163C (en) 1993-12-30 1994-12-07 Data modulation arrangement for selectively distributing data

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002177163A Expired - Fee Related CA2177163C (en) 1993-12-30 1994-12-07 Data modulation arrangement for selectively distributing data

Country Status (6)

Country Link
US (2) US5408259A (en)
EP (1) EP0737403B1 (en)
JP (1) JP2844019B2 (en)
CA (2) CA2136603C (en)
DE (1) DE69416429T2 (en)
WO (1) WO1995018510A1 (en)

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Also Published As

Publication number Publication date
WO1995018510A1 (en) 1995-07-06
JPH09500511A (en) 1997-01-14
CA2177163A1 (en) 1995-07-06
CA2177163C (en) 1999-07-27
US5499047A (en) 1996-03-12
CA2136603C (en) 1999-08-03
EP0737403A1 (en) 1996-10-16
EP0737403B1 (en) 1999-02-03
DE69416429T2 (en) 1999-06-10
JP2844019B2 (en) 1999-01-06
US5408259A (en) 1995-04-18
DE69416429D1 (en) 1999-03-18

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Legal Events

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EEER Examination request
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Effective date: 20021125