JPS5772446A - Multibranch connection system - Google Patents

Multibranch connection system

Info

Publication number
JPS5772446A
JPS5772446A JP14877680A JP14877680A JPS5772446A JP S5772446 A JPS5772446 A JP S5772446A JP 14877680 A JP14877680 A JP 14877680A JP 14877680 A JP14877680 A JP 14877680A JP S5772446 A JPS5772446 A JP S5772446A
Authority
JP
Japan
Prior art keywords
communication lines
terminal equipments
variable element
impedance
multibranch
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.)
Pending
Application number
JP14877680A
Other languages
Japanese (ja)
Inventor
Yoshio Onishi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14877680A priority Critical patent/JPS5772446A/en
Publication of JPS5772446A publication Critical patent/JPS5772446A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0278—Arrangements for impedance matching
    • 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
    • H04L25/12—Compensating for variations in line impedance
    • 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
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission

Landscapes

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

Abstract

PURPOSE:To make a parallel impedance between communication lines approximately constant for increment and reduction of the number of terminal equipments of multibranch connection, by connecting an impedance variable element between two communication lines. CONSTITUTION:A center equipement 10 and many terminal equipments 12, 13, 14... are connected by two communication lines 18. A common automatic controller 11 is inserted between the center equipment and terminal equipments. The common automatic controller 11 consists of an impedance variable element 15, an amplitude detector 16, and an amplitude control part 17 connected between two communication lines 18. When the number of terminal equipments is increased or reduced, the level between communication lines 18 is changed, and this change is detected by the amplitude detector 16, and the differential signal for a reference set level is given to the impedance variable element 15 through the amplitude control part 17, thus making the parallel impedance between communication libes 18 constant approximately.
JP14877680A 1980-10-23 1980-10-23 Multibranch connection system Pending JPS5772446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14877680A JPS5772446A (en) 1980-10-23 1980-10-23 Multibranch connection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14877680A JPS5772446A (en) 1980-10-23 1980-10-23 Multibranch connection system

Publications (1)

Publication Number Publication Date
JPS5772446A true JPS5772446A (en) 1982-05-06

Family

ID=15460403

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14877680A Pending JPS5772446A (en) 1980-10-23 1980-10-23 Multibranch connection system

Country Status (1)

Country Link
JP (1) JPS5772446A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6014529A (en) * 1983-07-05 1985-01-25 Matsushita Electric Ind Co Ltd Transmission and reception system
JPH0738580A (en) * 1993-06-28 1995-02-07 Nec Corp Variable terminating system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4911413A (en) * 1972-05-30 1974-01-31
JPS5032861A (en) * 1973-07-24 1975-03-29

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4911413A (en) * 1972-05-30 1974-01-31
JPS5032861A (en) * 1973-07-24 1975-03-29

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6014529A (en) * 1983-07-05 1985-01-25 Matsushita Electric Ind Co Ltd Transmission and reception system
JPH0447497B2 (en) * 1983-07-05 1992-08-04 Matsushita Electric Ind Co Ltd
JPH0738580A (en) * 1993-06-28 1995-02-07 Nec Corp Variable terminating system

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