WO1991003896A3 - Computer communications system - Google Patents

Computer communications system Download PDF

Info

Publication number
WO1991003896A3
WO1991003896A3 PCT/GB1990/001386 GB9001386W WO9103896A3 WO 1991003896 A3 WO1991003896 A3 WO 1991003896A3 GB 9001386 W GB9001386 W GB 9001386W WO 9103896 A3 WO9103896 A3 WO 9103896A3
Authority
WO
WIPO (PCT)
Prior art keywords
pcb
data
digital
sent
analog
Prior art date
Application number
PCT/GB1990/001386
Other languages
French (fr)
Other versions
WO1991003896A2 (en
Inventor
Nigel Peter Brown
Aaron Michael Turner
Nigel John Halse
Paul Nicholas Williams
Original Assignee
Verran Electronics Limited
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 Verran Electronics Limited filed Critical Verran Electronics Limited
Publication of WO1991003896A2 publication Critical patent/WO1991003896A2/en
Publication of WO1991003896A3 publication Critical patent/WO1991003896A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5408—Methods of transmitting or receiving signals via power distribution lines using protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5425—Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5445—Local network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5495—Systems for power line communications having measurements and testing channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/08—Randomization, e.g. dummy operations or using noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/12—Details relating to cryptographic hardware or logic circuitry
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/34—Encoding or coding, e.g. Huffman coding or error correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/60—Digital content management, e.g. content distribution
    • H04L2209/601—Broadcast encryption

Abstract

A data communications device for communication via the mains wiring (18) of a building comprises an analog PCB (34) and a digital PCB (36). The analog PCB includes a modem (44) including a line driver (48) with a power amplifier (54) that has a high input impedance when receiving, and compensates for different mains impedances when transmitting. The digital PCB (36) includes hardware and algorithms for encrypting the data that is being sent, and decrypting it on receipt. A standard CRC shift register (72) is used to provide pseudo random data for the encryption and decryption. The digital PCB also includes means for varying the size of the packets of frames of data being sent, to maximise the overall transmission rate.
PCT/GB1990/001386 1989-09-07 1990-09-07 Computer communications system WO1991003896A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8920261.8 1989-09-07
GB8920261A GB8920261D0 (en) 1989-09-07 1989-09-07 Computer communications system

Publications (2)

Publication Number Publication Date
WO1991003896A2 WO1991003896A2 (en) 1991-03-21
WO1991003896A3 true WO1991003896A3 (en) 1991-11-28

Family

ID=10662699

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/001386 WO1991003896A2 (en) 1989-09-07 1990-09-07 Computer communications system

Country Status (3)

Country Link
AU (1) AU6332990A (en)
GB (1) GB8920261D0 (en)
WO (1) WO1991003896A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1316170A2 (en) * 2000-06-07 2003-06-04 Conexant Systems, Inc. Method and apparatus for medium access control in powerline communication network systems

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878333A (en) * 1972-12-12 1975-04-15 Oki Electric Ind Co Ltd Simplex ARQ system
WO1980002349A1 (en) * 1979-04-16 1980-10-30 Ncr Co Apparatus for enciphering and/or deciphering data signals
EP0100106A2 (en) * 1982-07-28 1984-02-08 Communications Satellite Corporation Communications systems and transmitters and receivers including scrambling devices
EP0141673A2 (en) * 1983-11-07 1985-05-15 Emlux Limited Filtering electrical signals
WO1986002794A1 (en) * 1984-10-31 1986-05-09 Brown, Boveri & Cie Aktiengesellschaft Process for reducing the loading of a transmission circuit by the receiving circuit of several transmission/receiving sets, and a circuit arrangement for realisation of the process
EP0214625A2 (en) * 1985-09-11 1987-03-18 AT&T Corp. Flow control scheme for a switching network
US4771458A (en) * 1987-03-12 1988-09-13 Zenith Electronics Corporation Secure data packet transmission system and method
EP0316536A2 (en) * 1987-11-13 1989-05-24 Mitsubishi Denki Kabushiki Kaisha Terminal unit in information transmission system
JPH06172432A (en) * 1992-12-03 1994-06-21 Mitsubishi Petrochem Co Ltd Catalyst for olefin polymerization

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878333A (en) * 1972-12-12 1975-04-15 Oki Electric Ind Co Ltd Simplex ARQ system
WO1980002349A1 (en) * 1979-04-16 1980-10-30 Ncr Co Apparatus for enciphering and/or deciphering data signals
EP0100106A2 (en) * 1982-07-28 1984-02-08 Communications Satellite Corporation Communications systems and transmitters and receivers including scrambling devices
EP0141673A2 (en) * 1983-11-07 1985-05-15 Emlux Limited Filtering electrical signals
WO1986002794A1 (en) * 1984-10-31 1986-05-09 Brown, Boveri & Cie Aktiengesellschaft Process for reducing the loading of a transmission circuit by the receiving circuit of several transmission/receiving sets, and a circuit arrangement for realisation of the process
EP0214625A2 (en) * 1985-09-11 1987-03-18 AT&T Corp. Flow control scheme for a switching network
US4771458A (en) * 1987-03-12 1988-09-13 Zenith Electronics Corporation Secure data packet transmission system and method
EP0316536A2 (en) * 1987-11-13 1989-05-24 Mitsubishi Denki Kabushiki Kaisha Terminal unit in information transmission system
JPH06172432A (en) * 1992-12-03 1994-06-21 Mitsubishi Petrochem Co Ltd Catalyst for olefin polymerization

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IEEE Transactions on Consumer Electronics, vol. CE-28, no. 3, August 1982, M. Lee: "A new carrier current transceiver I.C.", pages 409-413, see page 409, right-hand column, lines 11-15, line 38 - page 410, left-hand column, line 8 *
Patent Abstracts of Japan, vol. 10, no. 240 (E-429)[2296], 19 August 1986, & JP, A, 6172432 (FUJITSU), see the abstract *
Patent Abstracts of Japan, vol. 8, no. 142 (E-254)[1579], 3 July 1984, & JP, A, 5950627 (TATEISHI DENKI), see the abstract *

Also Published As

Publication number Publication date
WO1991003896A2 (en) 1991-03-21
GB8920261D0 (en) 1989-10-18
AU6332990A (en) 1991-04-08

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