GB853534A - Electrical communication systems - Google Patents

Electrical communication systems

Info

Publication number
GB853534A
GB853534A GB37562/58A GB3756258A GB853534A GB 853534 A GB853534 A GB 853534A GB 37562/58 A GB37562/58 A GB 37562/58A GB 3756258 A GB3756258 A GB 3756258A GB 853534 A GB853534 A GB 853534A
Authority
GB
United Kingdom
Prior art keywords
station
signal
field
data
seize
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
GB37562/58A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB853534A publication Critical patent/GB853534A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L7/00—Remote control of local operating means for points, signals, or trackmounted scotch-blocks
    • B61L7/06—Remote control of local operating means for points, signals, or trackmounted scotch-blocks using electrical transmission
    • B61L7/08—Circuitry
    • B61L7/088—Common line wire control using series of coded pulses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
    • G06F13/368—Handling requests for interconnection or transfer for access to common bus or bus system with decentralised access control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/08—Arrangements for interconnection between switching centres for phantom working
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

853,534. Electric selective signalling systems. PHILIPS ELECTRICAL INDUSTRIES Ltd. Nov. 21, 1958 [Nov. 21, 1957], No. 37562/58. Class 40 (1). In a selective signalling system in which a number of field stations S1 S2 ... S5, Fig. 1, are connected to a central station over a single communication channel each field station when it receives any data from some external source temporarily stores the data in a memory M1, M2 ... M5, until the communication channel is not in use by any other field station, and then transmits its data to the central station. In order to prevent several field stations transmitting data simultaneously the following arrangement is employed. Immediately a field station has data it wants to transmit it " listens " to the communication channel. If the channel is disengaged (i.e. if no signals are present on it) then the field station transmits a "seize " signal which comprises an A.C. signal of a frequency f1 and a duration SE1, SE2 ... SE5, Fig. 2, corresponding to the particular field station. The field station then " listens " to the channel again for a short period I, Fig. 2, and if the channel is still disengaged it transmits a " lock " signal SV also of frequency f1 and of a duration which is longer than any " seize " signal, after which it immediately transmits its data Sc. If, when a field station " listens " in an interval I after having transmitted its " seize " signal and finds the channel engaged (by another field station's " seize " or " lock " signal), then it reverts to its normal condition and continues " listening." When the channel next becomes disengaged it will make a further attempt and retransmit its " seize " signal. An outline construction of a field station (Fig. 3, not shown), is given which includes a rectifying arrangement as a " listener," transistor flip-flops and diode gates as a control circuit which ensure that the field. station only tries to transmit when it has data in its memory, and a counter, counting 25c/s pulses for controlling the production of the " seize " and " lock " signals.
GB37562/58A 1957-11-21 1958-11-21 Electrical communication systems Expired GB853534A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1082947X 1957-11-21

Publications (1)

Publication Number Publication Date
GB853534A true GB853534A (en) 1960-11-09

Family

ID=9610951

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37562/58A Expired GB853534A (en) 1957-11-21 1958-11-21 Electrical communication systems

Country Status (3)

Country Link
DE (1) DE1082947B (en)
FR (1) FR1188034A (en)
GB (1) GB853534A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023403A1 (en) * 1979-07-25 1981-02-04 L M Ericsson Proprietary Limited A digital loop sharing communication system and a telephone instrument for use therein
GB2137385A (en) * 1983-03-31 1984-10-03 Colin Spencer Todd Vehicle fire and/or intruder detection system
EP0172236A1 (en) * 1984-02-15 1986-02-26 Codenoll Technology Corp Method and apparatus for detecting the collision of data packets.
WO2001093223A1 (en) * 2000-05-30 2001-12-06 Koninklijke Philips Electronics N.V. Method of preventing collision between remote control signals

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU541189B2 (en) * 1980-02-11 1984-12-20 Data General Corporation Data processing system
US4387425A (en) * 1980-05-19 1983-06-07 Data General Corporation Masterless and contentionless computer network
FR2508257B1 (en) * 1981-06-19 1988-04-29 Peugeot METHOD FOR TRANSMITTING MESSAGES BETWEEN SELF-CONTAINED TRANSCEIVER MODULES HAVING INDEPENDENT CLOCKS AND INTERNAL SYNCHRONIZATION DEVICES
FR2531587A1 (en) * 1982-08-03 1984-02-10 Morey Gilles METHOD FOR TRANSMITTING INFORMATION ON A SINGLE CHANGES CHANNEL AND APPLYING SAID METHOD IN PARTICULAR TO DEVICES FORMING AN ALARM SYSTEM
DE3432430A1 (en) * 1984-09-04 1986-03-13 Robert Bosch Gmbh, 7000 Stuttgart METHOD FOR CHECKING CONTROL UNITS
FR2639496A1 (en) * 1988-11-18 1990-05-25 Trt Telecom Radio Electr Local communication network with collision avoidance, method for its implementation and application to a transmitter/receiver remote control network
DE102007020440B4 (en) * 2007-04-27 2019-06-13 Carl Zeiss Industrielle Messtechnik Gmbh Synchronization bus system, communication units for a synchronization bus system and method for exchanging messages for time synchronization

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023403A1 (en) * 1979-07-25 1981-02-04 L M Ericsson Proprietary Limited A digital loop sharing communication system and a telephone instrument for use therein
GB2137385A (en) * 1983-03-31 1984-10-03 Colin Spencer Todd Vehicle fire and/or intruder detection system
EP0172236A1 (en) * 1984-02-15 1986-02-26 Codenoll Technology Corp Method and apparatus for detecting the collision of data packets.
EP0172236A4 (en) * 1984-02-15 1990-01-08 Codenoll Technology Corp Method and apparatus for detecting the collision of data packets.
WO2001093223A1 (en) * 2000-05-30 2001-12-06 Koninklijke Philips Electronics N.V. Method of preventing collision between remote control signals

Also Published As

Publication number Publication date
FR1188034A (en) 1959-09-18
DE1082947B (en) 1960-06-09

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