GB1221964A – Data transmission system
– Google Patents
GB1221964A – Data transmission system
– Google Patents
Data transmission system
Info
Publication number
GB1221964A
GB1221964A
GB06233/68A
GB1623368A
GB1221964A
GB 1221964 A
GB1221964 A
GB 1221964A
GB 06233/68 A
GB06233/68 A
GB 06233/68A
GB 1623368 A
GB1623368 A
GB 1623368A
GB 1221964 A
GB1221964 A
GB 1221964A
Authority
GB
United Kingdom
Prior art keywords
line
unit
coupled
trigger
receiver
Prior art date
1967-04-18
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
GB06233/68A
Inventor
Alain Croisier
Alain Falcoz
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.)
1967-04-18
Filing date
1968-04-04
Publication date
1971-02-10
1967-04-18
Priority claimed from FR8463A
external-priority
patent/FR1527135A/en
1968-04-04
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp
1971-02-10
Publication of GB1221964A
publication
Critical
patent/GB1221964A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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]
H04L12/40—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)
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
G06F13/38—Information transfer, e.g. on bus
G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
G06F13/4204—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus
G06F13/4208—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being a system bus, e.g. VME bus, Futurebus, Multibus
G06F13/4217—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being a system bus, e.g. VME bus, Futurebus, Multibus with synchronous protocol
Abstract
1,221,964. Digital transmission systems. INTERNATIONAL BUSINESS MACHINES CORP. 4 April, 1968 [18 April, 1967], No. 16233/68. Heading H4P. [Also in Division G4] A data transmission system (Fig. 1) comprises transmission and reception units 1, 2 which may be components of a data processing unit or of magnetic tape stores, printers, displays or punches. These are unidirectionally coupled at 14 to a channel comprising a data line 7, a clock line 8, and a transmission demand line 9. Line 7 may be plural to transmit a byte of data in parallel. Units 1, 2 have associated control units 5, 6 connected over lines 10, 11, 39 and 12, 13, 40 driving transmitters 31, 32; 33, 34 and receiving the outputs of receivers 41, 42; 44, 45, and are directly coupled to line 7 over receivers 43, 46. Thus unit 1 is coupled to line 7 over transmitter 31 and receiver 43; to line 8 over receiver 42, and to line 9 over transmitter 32 and receiver 41. Control unit 5 (Fig. 2), to which control unit 6 is similar, comprises a transmission demand trigger 22 and a data trigger 48 receiving “1” inputs over lines 11, 10 from unit 1. The “1” output 27 of trigger 22 when energized in response to the “1” input is connected to AND units 16, 23; the former also receiving operating signals from receiver 42 coupled to clock line 8, from inverter 18 driven from receiver 41 coupled to demand line 9, and from delay 20 coupled to the output of AND unit 23, which receives signals from trigger 22, and over delay 24 from receiver 42; to energize transmitter 32 coupled to demand line 9. Trigger 48 energizes AND unit 28 together with signals from the output of AND unit 16, and this output also energizes the “O” inputs of triggers 22, 48 over delay 35, while the AND unit 28 operates transmitter 31 coupled to data line 7. In operation, for unit 1 to transmit a binary digit, trigger 48 is set to “1” state to energize AND unit 28 and trigger 22 is also set to “1” to operate trigger 22 and energize AND gate 16. The next succeeding clock pulse over receiver 42 energizes AND unit 16 and also AND unit 23 after delay in 24, so as to energize transmitter 32 which imposes a transmission demand signal on line 9, and energizes the AND unit 16 after delay in 20. Inverter 18 driven from receiver 41 coupled to the transmission demand signal on line 9 energizes AND unit 16, in the absence of a transmission demand signal on line 9 and presence of a clock pulse on line 8, to actuate AND circuit 28 and transmitter 31 to transmit the “1” bit stored at 48 into line 7. After delay at 35, trigger circuits 22, 48 are reset with unit 1; indicating that data has been transmitted. If the AND unit 16 is inactivated for want of one or more inputs, triggers 22, 48 are not operated and the data signal is held stored in unit 5 until a clock pulse occurs in line 8 without a demand signal on line 9. As shown, units 1, 2 are coupled to the transmission channel so that signals are transmitted to the right and received from the left, and a transmission demand signal disables all other units from transmissions. Each TR unit may have dual control units 5 for rightward and leftward transmission; lines 7, 9 being doubled to avoid interference.
GB06233/68A
1967-04-18
1968-04-04
Data transmission system
Expired
GB1221964A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR8463A
FR1527135A
(en)
1967-04-18
1967-04-18
Asynchronous multiplex transmission system
Publications (1)
Publication Number
Publication Date
GB1221964A
true
GB1221964A
(en)
1971-02-10
Family
ID=88203346
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB06233/68A
Expired
GB1221964A
(en)
1967-04-18
1968-04-04
Data transmission system
Country Status (1)
Country
Link
GB
(1)
GB1221964A
(en)
Cited By (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2513834A1
(en)
*
1981-09-28
1983-04-01
Nippon Telegraph & Telephone
METHOD OF RESOLVING CONFLICTS IN A LOCAL NETWORK
EP0154774A2
(en)
*
1984-02-10
1985-09-18
Deutsche Thomson-Brandt GmbH
Data transmission with a bidirectionel data bus
GB2157923A
(en)
*
1984-03-02
1985-10-30
Motorola Inc
Multi-user serial data bus
EP0183273A2
(en)
*
1984-11-30
1986-06-04
Nec Corporation
Serial interface system flexibly applicable to a one-to-plurality connection
1968
1968-04-04
GB
GB06233/68A
patent/GB1221964A/en
not_active
Expired
Cited By (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2513834A1
(en)
*
1981-09-28
1983-04-01
Nippon Telegraph & Telephone
METHOD OF RESOLVING CONFLICTS IN A LOCAL NETWORK
EP0154774A2
(en)
*
1984-02-10
1985-09-18
Deutsche Thomson-Brandt GmbH
Data transmission with a bidirectionel data bus
EP0154774A3
(en)
*
1984-02-10
1988-10-05
Deutsche Thomson-Brandt Gmbh
Data transmission with a bidirectionel data bus
GB2157923A
(en)
*
1984-03-02
1985-10-30
Motorola Inc
Multi-user serial data bus
EP0183273A2
(en)
*
1984-11-30
1986-06-04
Nec Corporation
Serial interface system flexibly applicable to a one-to-plurality connection
EP0183273A3
(en)
*
1984-11-30
1988-08-31
Nec Corporation
Serial interface system flexibly applicable to a one-to-plurality connection
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DEVICE TRANSMISSION INFORMATION
Legal Events
Date
Code
Title
Description
1971-06-23
PS
Patent sealed [section 19, patents act 1949]
1984-12-05
PCNP
Patent ceased through non-payment of renewal fee
