CA2177163A1 - Data modulation arrangement for selectively distributing data - Google Patents

Data modulation arrangement for selectively distributing data

Info

Publication number
CA2177163A1
CA2177163A1 CA2177163A CA2177163A CA2177163A1 CA 2177163 A1 CA2177163 A1 CA 2177163A1 CA 2177163 A CA2177163 A CA 2177163A CA 2177163 A CA2177163 A CA 2177163A CA 2177163 A1 CA2177163 A1 CA 2177163A1
Authority
CA
Canada
Prior art keywords
modulators
data
customers
modulator
outputs
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
CA2177163A
Other languages
French (fr)
Other versions
CA2177163C (en
Inventor
Alastair Anthony Warwick
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 CA2177163A1 publication Critical patent/CA2177163A1/en
Application granted granted Critical
Publication of CA2177163C publication Critical patent/CA2177163C/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

Abstract

A cable television distribution arrangement is supplied via optical fibers with additional digital signals which are delivered to customers via coaxial drop cables (20) modulated at frequencies above those of the conventional analog television channels. A
reduction in the required number of modulators is achieved, while delivering individually selected signals to individual customers, by supplying digital signals for a group of customers to a first modulator (72) and a pseudo data signal to a second modulator (84), and selecting (78) between the outputs of the two modulators individually for each customer in the group. Switching between the outputs of the modulators is carried out during overhead information (O/H) which is additionally supplied commonly to both modulators.
CA002177163A 1993-12-30 1994-12-07 Data modulation arrangement for selectively distributing data Expired - Fee Related CA2177163C (en)

Applications Claiming Priority (3)

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
PCT/CA1994/000671 WO1995018510A1 (en) 1993-12-30 1994-12-07 Data modulation arrangement for selectively distributing data

Publications (2)

Publication Number Publication Date
CA2177163A1 true CA2177163A1 (en) 1995-07-06
CA2177163C CA2177163C (en) 1999-07-27

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 Before (1)

Application Number Title Priority Date Filing Date
CA002136603A Expired - Fee Related CA2136603C (en) 1993-12-30 1994-11-24 Television signal distribution network

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
EP0737403A1 (en) 1996-10-16
US5408259A (en) 1995-04-18
WO1995018510A1 (en) 1995-07-06
DE69416429D1 (en) 1999-03-18
CA2136603C (en) 1999-08-03
CA2136603A1 (en) 1995-07-01
DE69416429T2 (en) 1999-06-10
EP0737403B1 (en) 1999-02-03
US5499047A (en) 1996-03-12
JPH09500511A (en) 1997-01-14
CA2177163C (en) 1999-07-27
JP2844019B2 (en) 1999-01-06

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Legal Events

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EEER Examination request
MKLA Lapsed
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Effective date: 20031208