GB1510462A - Data transmission systems - Google Patents

Data transmission systems

Info

Publication number
GB1510462A
GB1510462A GB1496774A GB1496774A GB1510462A GB 1510462 A GB1510462 A GB 1510462A GB 1496774 A GB1496774 A GB 1496774A GB 1496774 A GB1496774 A GB 1496774A GB 1510462 A GB1510462 A GB 1510462A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
access unit
loop
address
message
access
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.)
Expired
Application number
GB1496774A
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.)
Babcock Partner No 6 Ltd
Original Assignee
Babcock Partner No 6 Ltd
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
Family has litigation

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/42Loop networks
    • H04L12/427Loop networks with decentralised control
    • H04L12/433Loop networks with decentralised control with asynchronous transmission, e.g. token ring, register insertion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. local area networks [LAN], wide area networks [WAN]
    • H04L12/42Loop networks
    • H04L12/437Ring fault isolation or reconfiguration

Abstract

1510462 Data transmission; loop systems HAWKER SIDDELEY DYNAMICS ENG Ltd 15 April 1975 [4 April 1974] 14967/74 Heading H4P [Also in Division G4] A digital data handling system has a plurality of highway access units each including a shift register, the shift registers being connected in series with each other to form a closed loop, each access unit having an address register for storing its own address and a comparator for comparing the address with address bits in the shift register. Each access unit can send a message to any other access unit over the loop which is unidirectional, the message consisting of a priority code, destination address, source address, parameter number and parameter value (data). An access unit receiving a message accepts it (and removes it) or passes it on, according as the destination address is its address or not. The access units may be linked by a second loop with its own shift registers running in the opposite direction (in case of breakdown), the shorter route normally being taken. In a modification, each section of each loop may be switched to take the place of the corresponding section of the other loop, independently of the other sections. Each loop may use a shielded twisted balanced pair of wires, light guide, ultrasonic path, electromagnetic radiation or any combination of these. An access unit may replace a message received (to be transmitted further) by another message of its own of higher priority, the replaced message being sent in the next available blank space. Three priority levels are used: normal, that for messages with time significance, and emergency. An access unit can test for a loop discontinuity by sending a message addressed to itself. It can also test the source address of each message received: if it finds its own address, this message was not received by the intended destination. A separate "monitor" access unit may be provided for testing the system and diagnosing faults, e.g. by requesting particular access units to send a response, to test the loop or transmit and receive circuits in the access units or A/D converters (see below). The monitor unit may check (for one access unit address at a time) that no particular message passes the monitor unit more than once. The monitor unit may command other access units regarding which loops they use, to avoid faulty sections, and (on request from an access unit) to permit uninterrupted bulk data transfer to another access unit from the requesting unit over loop sections dedicated to this transfer for as long as it takes (the data being sent alone). Each transmission channel of each access unit may be separately powered and isolated from the other, and have a by-pass connected in if a relay ceases to be energized by the power supply (due to power failure). Each access unit communicates with an associated sub-system via A/D and D/A converters, multiplexer and de-multiplexer and buffer storage, as appropriate, a portable access unit which can store and display all messages passing through it and can send test messages, can be provided together with shortable jack-points in the loops to enable it to be connected in where desired. The system may be applied to a conventional ship's autopilot, using five access units for gyro compass, electronics, steering motor, bridge controls and monitoring the system, respectively, this being described in detail.
GB1496774A 1975-04-15 1975-04-15 Data transmission systems Expired GB1510462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1496774A GB1510462A (en) 1975-04-15 1975-04-15 Data transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1496774A GB1510462A (en) 1975-04-15 1975-04-15 Data transmission systems

Publications (1)

Publication Number Publication Date
GB1510462A true true GB1510462A (en) 1978-05-10

Family

ID=10050726

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1496774A Expired GB1510462A (en) 1975-04-15 1975-04-15 Data transmission systems

Country Status (1)

Country Link
GB (1) GB1510462A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0003493A1 (en) * 1978-01-27 1979-08-22 International Business Machines Corporation Data transmission system between stations connected in a loop
FR2437746A1 (en) * 1978-09-28 1980-04-25 Gen Atomic Co digital communication system has multiple processors
FR2437745A1 (en) * 1978-09-28 1980-04-25 Gen Atomic Co communication system has multiple digital process
EP0018938A1 (en) * 1979-04-27 1980-11-12 Elmar Schulze Digital time-division multiplex telecommunication system
FR2472898A1 (en) * 1979-12-27 1981-07-03 Jeumont Schneider Twin loop cascade transmission network - has inverters in each substation for switching over loop lines in event of loop or substation
FR2475770A1 (en) * 1980-02-08 1981-08-14 Hitachi Ltd Method and control information communication system via a common line signal transmission
FR2486739A1 (en) * 1980-07-11 1982-01-15 Hitachi Ltd loop transmission system provided with a routing arrangement of messages OTT
FR2515904A1 (en) * 1981-11-02 1983-05-06 Coudreuse Jean Pierre Video communications transmission system for local loop network - contains microprocessor controlling data packet transmission flow and switching to receive mode
GB2118340A (en) * 1982-04-07 1983-10-26 Motorola Israel Ltd Signal processing unit
US4456903A (en) * 1980-03-25 1984-06-26 Nissan Motor Company, Ltd. Optical signal transmission system for an automotive vehicle
GB2133952A (en) * 1982-12-22 1984-08-01 Int Standard Electric Corp Multiple-ring communication system
FR2540694A1 (en) * 1983-02-07 1984-08-10 Trt Telecom Radio Electr telecommunication system in loop having a time-multiplexed first and second transmission lines
US4573044A (en) * 1982-02-08 1986-02-25 Racal-Milgo Limited Two channel looped communication system having rerouting and folded loop capabilities
GB2168517A (en) * 1984-12-18 1986-06-18 Gent Ltd Information transmission system
US4841450A (en) * 1983-09-02 1989-06-20 Kvaser Consultant, Ab Arrangement comprising a system providing movement, processing and/or production
EP0726160A1 (en) * 1995-02-10 1996-08-14 Canon Kabushiki Kaisha Optional apparatus connectable to other apparatus
WO2004071024A1 (en) * 2003-02-05 2004-08-19 Siemens Aktiengesellschaft Communications network

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0003493A1 (en) * 1978-01-27 1979-08-22 International Business Machines Corporation Data transmission system between stations connected in a loop
FR2437746A1 (en) * 1978-09-28 1980-04-25 Gen Atomic Co digital communication system has multiple processors
FR2437745A1 (en) * 1978-09-28 1980-04-25 Gen Atomic Co communication system has multiple digital process
EP0018938A1 (en) * 1979-04-27 1980-11-12 Elmar Schulze Digital time-division multiplex telecommunication system
FR2472898A1 (en) * 1979-12-27 1981-07-03 Jeumont Schneider Twin loop cascade transmission network - has inverters in each substation for switching over loop lines in event of loop or substation
FR2475770A1 (en) * 1980-02-08 1981-08-14 Hitachi Ltd Method and control information communication system via a common line signal transmission
US4456903A (en) * 1980-03-25 1984-06-26 Nissan Motor Company, Ltd. Optical signal transmission system for an automotive vehicle
FR2486739A1 (en) * 1980-07-11 1982-01-15 Hitachi Ltd loop transmission system provided with a routing arrangement of messages OTT
FR2515904A1 (en) * 1981-11-02 1983-05-06 Coudreuse Jean Pierre Video communications transmission system for local loop network - contains microprocessor controlling data packet transmission flow and switching to receive mode
US4573044A (en) * 1982-02-08 1986-02-25 Racal-Milgo Limited Two channel looped communication system having rerouting and folded loop capabilities
GB2118340A (en) * 1982-04-07 1983-10-26 Motorola Israel Ltd Signal processing unit
GB2133952A (en) * 1982-12-22 1984-08-01 Int Standard Electric Corp Multiple-ring communication system
FR2540694A1 (en) * 1983-02-07 1984-08-10 Trt Telecom Radio Electr telecommunication system in loop having a time-multiplexed first and second transmission lines
EP0115894A1 (en) * 1983-02-07 1984-08-15 Telecommunications Radioelectriques Et Telephoniques T.R.T. TDM loop telecommunication system comprising a first and a second transmission line
US4841450A (en) * 1983-09-02 1989-06-20 Kvaser Consultant, Ab Arrangement comprising a system providing movement, processing and/or production
GB2168517A (en) * 1984-12-18 1986-06-18 Gent Ltd Information transmission system
EP0726160A1 (en) * 1995-02-10 1996-08-14 Canon Kabushiki Kaisha Optional apparatus connectable to other apparatus
WO2004071024A1 (en) * 2003-02-05 2004-08-19 Siemens Aktiengesellschaft Communications network

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Legal Events

Date Code Title Description
PS Patent sealed
433D Application made for revocation (sect. 33/1949)
771 Application made for declaration of non-infringement (sect. 71/1977)
771B Application granted in part (sect. 71/1977)
433C Case decided by the comptroller ** specification amended (sect. 33/1949)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee