GB1256024A - A data transmission system - Google Patents

A data transmission system

Info

Publication number
GB1256024A
GB1256024A GB5916069A GB5916069A GB1256024A GB 1256024 A GB1256024 A GB 1256024A GB 5916069 A GB5916069 A GB 5916069A GB 5916069 A GB5916069 A GB 5916069A GB 1256024 A GB1256024 A GB 1256024A
Authority
GB
United Kingdom
Prior art keywords
station
area
stations
loop
signal
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
GB5916069A
Inventor
Ulrich Klose
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1256024A publication Critical patent/GB1256024A/en
Expired legal-status Critical Current

Links

Classifications

    • 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]
    • H04L12/42—Loop networks
    • H04L12/423—Loop networks with centralised control, e.g. polling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

1,256,024. Digital transmission systems. INTERNATIONAL BUSINESS MACHINES CORP. 4 Dec., 1969 [20 Dec., 1968], No. 59160/69. Heading H4P. [Also in Divisions G4-G6] A data transmission system comprises a plurality of stations 1-17 arranged in a closed loop, each station I-M including a by-pass (not shown in Fig. 1) that can be broken when the corresponding station receives or transmits signals; when signals are interchanged by two stations, the signal from one station passes around one portion of the closed loop, while the signal from the second station passes around the remaining portion of the loop. As described in relation to airline seat reservation, the system includes a central station 1 and area stations 2- 17 interconnected through modulators 18, 20, 22, 24 and demodulators 19, 21, 23, 25. All signals, which are in binary-coded-decimal form, are transmitted counterclockwise around the loop; an area station (illustrated in Fig. 2, not reproduced) receives and transmits signals in serial form, but converts them internally to parallel mode. If the central station 1 wishes to receive data, it transmits around the loop a SEND ADDRESS signal, all area stations desiring communication replying by transmitting their address. The centr al station 1 then interrogates these stations in turn by sending a control signal to instigate transmission of each data character. If the central station 1 wishes to send data to area station 4, this address is transmitted around the loop and decoded in area station 4, which then breaks its by-pass. Data transmission then occurs, instigated by control signals sent from area station 4 to the central station 1. The central station 1 instigates data transmission between pairs of area stations by sending a CALL signal around the loop, which is replied to by a TAKE signal from area stations desiring communication. A pair of area stations then interchange control and data signals. Each area station 2-17 (see also Fig. 2, which shows an area station) controls its by-pass with an AND gate (36); the area station is controlled by internal logic (39).
GB5916069A 1968-12-20 1969-12-04 A data transmission system Expired GB1256024A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1770368A SE324667B (en) 1968-12-20 1968-12-20

Publications (1)

Publication Number Publication Date
GB1256024A true GB1256024A (en) 1971-12-08

Family

ID=20303884

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5916069A Expired GB1256024A (en) 1968-12-20 1969-12-04 A data transmission system

Country Status (5)

Country Link
JP (1) JPS5627030B1 (en)
DE (1) DE1964009A1 (en)
FR (1) FR2026635A1 (en)
GB (1) GB1256024A (en)
SE (1) SE324667B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749845A (en) * 1971-08-27 1973-07-31 Bell Telephone Labor Inc Digital data communication system
US4486852A (en) * 1978-06-05 1984-12-04 Fmc Corporation Synchronous time-shared data bus system
NO791842L (en) * 1978-06-05 1979-12-06 Fmc Corp DATABUS SYSTEM.
US4627070A (en) * 1981-09-16 1986-12-02 Fmc Corporation Asynchronous data bus system
DE10200974B4 (en) * 2002-01-12 2005-02-17 Beurer Gmbh & Co. Heating device with flexible radiator

Also Published As

Publication number Publication date
DE1964009A1 (en) 1970-07-16
JPS5627030B1 (en) 1981-06-22
SE324667B (en) 1970-06-08
FR2026635A1 (en) 1970-09-18

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