GB987293A - Electrical communication apparatus - Google Patents

Electrical communication apparatus

Info

Publication number
GB987293A
GB987293A GB2138862A GB2138862A GB987293A GB 987293 A GB987293 A GB 987293A GB 2138862 A GB2138862 A GB 2138862A GB 2138862 A GB2138862 A GB 2138862A GB 987293 A GB987293 A GB 987293A
Authority
GB
United Kingdom
Prior art keywords
mulcom
sequence
data processing
mulcoms
processing centre
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
GB2138862A
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
Priority claimed from US120385A external-priority patent/US3244804A/en
Priority claimed from US120771A external-priority patent/US3244805A/en
Priority claimed from US121081A external-priority patent/US3245038A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB987293A publication Critical patent/GB987293A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
    • G06F13/22—Handling requests for interconnection or transfer for access to input/output bus using successive scanning, e.g. polling
    • 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
    • H04L12/403—Bus networks with centralised control, e.g. polling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Communication Control (AREA)
  • Small-Scale Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

987,293. Electric selective signalling systems. INTERNATIONAL BUSINESS MACHINES CORPORATION. June 4,1962 [June 30, 1961], No. 21388/62. Heading G4H. In a communication system for transferring data between a plurality of terminal units T1, T2, . . . T9, Fig. 10, to a data processing centre DPC via a plurality of addressable multiplexing communication units M1, M2, M3, referred to as "Mulcoms", the mulcoms are activated sequentially to cycliacally scan their associated terminal units and the activation sequence for the mulcoms is determined by addresses stored within the mulcoms, each mulcom storing the address of the next mulcom in the sequence. Thus after a mulcom has completed a scan of its associated terminal units it issues an instruction containing the address of the next mulcom in the sequence to cause it to respond. If for any reason a mulcom instructed in this way to respond does not do so the data processing centre has facilities for modifying the next mulcom address stored in the mulcom that has just responded so that in subsequent sequences the mulcom that did not respond is bypassed. The mulcom sequence is arranged as an open sequence, that if, for example the sequence is M1, M2, M3, then after M3 has responded control reverts automatically to the data processing centre which will normally initiate a further sequence by activating mulcom M1 However, the data processing centre can initiate a further sequence from some intermediate point in the sequence. Thus, if mulcom M1 is not very busy, the data processing centre can initiate a sequence starting at mulcom M2. When a mulcom is activated it scans all its terminal units cyclically stopping only at those which indicate that they have data they wish to transmit to the data processing centre. Every message from a terminal unit to the data processing station includes the address of the terminal unit and the address of the associated mulcom. While one mulcom is activated the other mulcoms are listening to the line waiting for their instructions to go ahead. In a modification the terminal units associated with anv one mulcom can themselves determine the sequence in which they are scanned in a similar way to the way in which the mulcom activating sequence is determined. Specifications 816,828, 987,219 and 987,292 are referred to.
GB2138862A 1961-06-28 1962-06-04 Electrical communication apparatus Expired GB987293A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US120385A US3244804A (en) 1961-06-28 1961-06-28 Time delay controlled remote station transmission to central data collecting station
US120771A US3244805A (en) 1961-06-29 1961-06-29 Counter controlled remote station transmission to central data collecting station
US121081A US3245038A (en) 1961-06-30 1961-06-30 Central to remote communication system with address modification for the remote stations

Publications (1)

Publication Number Publication Date
GB987293A true GB987293A (en) 1965-03-24

Family

ID=27382467

Family Applications (3)

Application Number Title Priority Date Filing Date
GB2138762A Expired GB987292A (en) 1961-06-28 1962-06-04 Electrical communication apparatus
GB2138662A Expired GB987291A (en) 1961-06-28 1962-06-04 Electrical communication apparatus
GB2138862A Expired GB987293A (en) 1961-06-28 1962-06-04 Electrical communication apparatus

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB2138762A Expired GB987292A (en) 1961-06-28 1962-06-04 Electrical communication apparatus
GB2138662A Expired GB987291A (en) 1961-06-28 1962-06-04 Electrical communication apparatus

Country Status (4)

Country Link
DK (2) DK136088B (en)
GB (3) GB987292A (en)
NL (1) NL280254A (en)
SE (2) SE317097B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293948A (en) 1967-11-23 1981-10-06 Olof Soderblom Data transmission system
GB2118338A (en) * 1982-04-07 1983-10-26 Motorola Israel Ltd Signal processing unit
US5369783A (en) * 1988-08-08 1994-11-29 Ericsson Ge Mobile Communications Inc. Dynamic regrouping in a trunked radio communications systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091143A3 (en) * 1982-04-07 1984-03-28 Motorola Israel Limited Signal processing unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4293948A (en) 1967-11-23 1981-10-06 Olof Soderblom Data transmission system
USRE31852E (en) * 1967-11-23 1985-03-19 Willemijn Houdstermaatschappij BV Data transmission system
GB2118338A (en) * 1982-04-07 1983-10-26 Motorola Israel Ltd Signal processing unit
US5369783A (en) * 1988-08-08 1994-11-29 Ericsson Ge Mobile Communications Inc. Dynamic regrouping in a trunked radio communications systems

Also Published As

Publication number Publication date
NL280254A (en)
SE317097B (en) 1969-11-10
DE1424718A1 (en) 1969-09-18
DK124363B (en) 1972-10-09
GB987291A (en) 1965-03-24
DE1424718B2 (en) 1972-12-07
GB987292A (en) 1965-03-24
DK136088C (en) 1978-01-09
SE316793B (en) 1969-11-03
DK136088B (en) 1977-08-08

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