GB1450438A - Data communications system - Google Patents

Data communications system

Info

Publication number
GB1450438A
GB1450438A GB5893473A GB5893473A GB1450438A GB 1450438 A GB1450438 A GB 1450438A GB 5893473 A GB5893473 A GB 5893473A GB 5893473 A GB5893473 A GB 5893473A GB 1450438 A GB1450438 A GB 1450438A
Authority
GB
United Kingdom
Prior art keywords
phase
master station
transmission
equalizer
adaptive
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
GB5893473A
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 GB1450438A publication Critical patent/GB1450438A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Small-Scale Networks (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

1450438 Data transmission; master and slave systems INTERNATIONAL BUSINESS MACHINES CORP 19 Dec 1973 [29 Dec 1972] 58934/73 Heading H4P In a system where a plurality of remote stations work to a master station through channels having differing characteristics, address signals individually identifiable at the master station in the absence of equalization, cause appropriate adjustment of a compensating equalizing means. The address signals may be of differing frequency or phase. At the master station receiver, incoming signals pass through A.G.C. 7<SP>1</SP> to equalizer 8<SP>1</SP> whose coefficients are adjusted by memory 17 in correspondence with each received address, and then passed to phase discriminator 9<SP>1</SP>, also receiving a signal from clock recovery circuit 10<SP>1</SP> (active only during sync. periods) feeding a decoding circuit 12<SP>1</SP>; output from this may be passed direct through a multiple address decoder 15<SP>1</SP> or data descrambler 14<SP>1</SP> according to the position of switch 13<SP>1</SP>. Where 8 phase transmission, i.e. 3 bit groups is used, one phase # is reserved for sync. purposes. Alternatively a series of 1's in clear or scrambled may be used. Coefficients loaded into memory 17 are obtained by test procedures. The equalizer may be of auto transversal type, adaptive or non-adaptive and transmission by VSB or SSB is envisaged in the Specification.
GB5893473A 1972-12-29 1973-12-19 Data communications system Expired GB1450438A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7247216A FR2212715B1 (en) 1972-12-29 1972-12-29

Publications (1)

Publication Number Publication Date
GB1450438A true GB1450438A (en) 1976-09-22

Family

ID=9109634

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5893473A Expired GB1450438A (en) 1972-12-29 1973-12-19 Data communications system

Country Status (6)

Country Link
JP (1) JPS535169B2 (en)
CA (1) CA997425A (en)
DE (1) DE2359618C3 (en)
FR (1) FR2212715B1 (en)
GB (1) GB1450438A (en)
IT (1) IT1005200B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7793826B2 (en) 2004-03-12 2010-09-14 British Telecommunications Public Limited Company Controlling transactions

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114712U (en) * 1980-02-05 1981-09-03
JPS56165449A (en) * 1980-05-23 1981-12-19 Nec Corp Transmitting device of multibranch data
JPH0740676B2 (en) * 1983-03-24 1995-05-01 ソニー株式会社 Digital transmission signal reproduction device
JPH07120971B2 (en) * 1986-07-18 1995-12-20 東洋通信機株式会社 Semi-fixed equalizer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566271A (en) * 1969-02-18 1971-02-23 Int Communications Corp Automatic equilization for multiple polled stations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7793826B2 (en) 2004-03-12 2010-09-14 British Telecommunications Public Limited Company Controlling transactions

Also Published As

Publication number Publication date
FR2212715A1 (en) 1974-07-26
CA997425A (en) 1976-09-21
DE2359618A1 (en) 1974-07-04
FR2212715B1 (en) 1978-03-10
JPS535169B2 (en) 1978-02-24
DE2359618C3 (en) 1981-06-19
DE2359618B2 (en) 1980-08-28
JPS4998904A (en) 1974-09-19
IT1005200B (en) 1976-08-20

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Legal Events

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