[go: up one dir, main page]

GB1213569A - Improvements in or relating to data transmission apparatus - Google Patents

Improvements in or relating to data transmission apparatus

Info

Publication number
GB1213569A
GB1213569A GB3959368A GB3959368A GB1213569A GB 1213569 A GB1213569 A GB 1213569A GB 3959368 A GB3959368 A GB 3959368A GB 3959368 A GB3959368 A GB 3959368A GB 1213569 A GB1213569 A GB 1213569A
Authority
GB
United Kingdom
Prior art keywords
data
character
ratio
counter
characters
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
GB3959368A
Inventor
Fritz Irro
Philipe De Backer
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 GB1213569A publication Critical patent/GB1213569A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0079—Receiver details
    • H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Manipulation Of Pulses (AREA)
  • Communication Control (AREA)

Abstract

1,213,569. Digital transmission systems. INTERNATIONAL BUSINESS MACHINES CORP. 19 Aug., 1968 [15 Sept., 1967], No. 39593/68. Heading H4P. In a data transmission system the transmitter includes means for determining the ratio of the number of data bit changes : the number of data characters in a stream of data to be transmitted, and for inserting a number of synchronizing bits in the data word stream if the ratio becomes so low that the receiver might lose synchronism. In the embodiment described the ratio must not fall below 1 : 16 over 96 characters. The data bits pass to a unit which delivers a pulse at each bit transition. The transitions are counted in a reversible counter of capacity 6. A second reversible counter, of capacity 16 Î 6 = 96, is stepped forward at character rate by clock pulses, but when neither it nor the transition counter is at zero it is stepped back by 16 in the duration of each character. Under these same conditions the transition counter is stepped back once per character. If the character counter ever becomes full when the transition counter is empty, i.e. if the ratio falls below 1:16 over any period of 96 characters, 6 sync. bits are inserted in the data character stream to be transmitted in order to maintain the ratio of the number of bit changes transmitted : the number of data characters transmitted equal to. 1 : 16.
GB3959368A 1967-09-15 1968-08-19 Improvements in or relating to data transmission apparatus Expired GB1213569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1967J0034583 DE1295593B (en) 1967-09-15 1967-09-15 Method and circuit arrangement for digital message transmission with synchronization by level, frequency or phase changes and additional synchronous pulses

Publications (1)

Publication Number Publication Date
GB1213569A true GB1213569A (en) 1970-11-25

Family

ID=7205130

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3959368A Expired GB1213569A (en) 1967-09-15 1968-08-19 Improvements in or relating to data transmission apparatus

Country Status (8)

Country Link
JP (1) JPS4815361B1 (en)
BE (1) BE720004A (en)
CH (1) CH476429A (en)
DE (1) DE1295593B (en)
FR (1) FR1577788A (en)
GB (1) GB1213569A (en)
NL (1) NL159252B (en)
SE (1) SE345055B (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB738587A (en) * 1952-08-06 1955-10-19 Mini Of Supply Synchronising arrangements for pulse communication systems
NL287379A (en) 1963-01-02 1964-03-10
GB1013054A (en) 1963-03-29 1965-12-15 Standard Telephones Cables Ltd Improvements in or relating to electrical circuits
DE1199314B (en) 1963-05-03 1965-08-26 Western Electric Co Device for the transmission of binary data via a synchronous regeneration pulse transmission system
DE1192239B (en) 1963-05-22 1965-05-06 Telefunken Patent Method and circuit arrangement for the transmission of digital data via a transmission path which requires security measures
DE1212146B (en) * 1963-06-10 1966-03-10 Siemens Ag Transmission system with pulse code modulated signals
DE1173932B (en) * 1963-07-23 1964-07-16 Telefunken Patent Method for data transmission in which the coded message content consists of a phase difference between successive signals
US3463887A (en) * 1963-11-07 1969-08-26 Nippon Electric Co Time-division multiplexed pcm transmission system
NL142035B (en) * 1964-02-08 1974-04-16 Philips Nv TRANSMISSION SYSTEM FOR TRANSMISSION OF TWO-VALUED INFORMATION PULSES WITH SYNCHRONIZATION IN THE RECEIVER ON RECEIVED SIGNAL TRANSFERS.
DE1193086B (en) * 1964-02-21 1965-05-20 Telefunken Patent Method for data transmission in which the information is transmitted in individual blocks

Also Published As

Publication number Publication date
FR1577788A (en) 1969-08-08
SE345055B (en) 1972-05-08
BE720004A (en) 1969-02-03
JPS4815361B1 (en) 1973-05-14
CH476429A (en) 1969-07-31
NL159252B (en) 1979-01-15
NL6812935A (en) 1969-03-18
DE1295593B (en) 1969-05-22

Similar Documents

Publication Publication Date Title
GB1219464A (en) Graphic communication interface electrical system
GB1487689A (en) Time division multiple access satellite communications system
GB1487570A (en) Digital data compensation system
GB1171566A (en) Improvements in or relating to Data Transmission Apparatus
GB1399513A (en) Method and circuit for timing singal derivation from received data
GB1360859A (en) Data communications systems
GB1122342A (en) Data signalling system
GB1190904A (en) Digital Data Receiver
GB1072064A (en) System for transmitting digital data
GB1513802A (en) Communication systems
GB1402176A (en) Computer interface coding and decoding apparatus
GB1213569A (en) Improvements in or relating to data transmission apparatus
US3599156A (en) Methods and apparatus for transmitting data between remote locations
US3576396A (en) Means for adapting a transmitted signal to a receiver with synchronized frame rates but unequal bit rates
NL6517225A (en)
GB1251878A (en)
GB1245611A (en) Improvements in frequency discriminator circuits
GB1377583A (en) Communication systems
GB996433A (en) Data transmission systems
GB1169798A (en) Synchronization Monitor Apparatus
GB1307403A (en) Digital synchronization system
GB1121373A (en) Data receiving terminal
GB1237422A (en) Bit sync recovery system
GB1176510A (en) Improvements in or relating to electrical time division communication systems
GB1418717A (en) Apparatus for synchronising reception of pulse coded transmissions

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee