JPS568981A - Selection system for balancing connected network - Google Patents

Selection system for balancing connected network

Info

Publication number
JPS568981A
JPS568981A JP8349879A JP8349879A JPS568981A JP S568981 A JPS568981 A JP S568981A JP 8349879 A JP8349879 A JP 8349879A JP 8349879 A JP8349879 A JP 8349879A JP S568981 A JPS568981 A JP S568981A
Authority
JP
Japan
Prior art keywords
wire
circuit
line
subscriber
telephone set
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
JP8349879A
Other languages
Japanese (ja)
Inventor
Kozo Kamata
Hirotoshi Shirasu
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8349879A priority Critical patent/JPS568981A/en
Publication of JPS568981A publication Critical patent/JPS568981A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To make it possible to reduce an intraoffice transmission loss by improving line balance with a two-wire circuit by selecting a balancing network suitable for a subscriber's line by a four-wire telephone switchboard and then by connecting this network to a two-wire/four-wire converting circuit. CONSTITUTION:Once a subscriber places telephone set 1 in the calling state, exchange 13 detects that by a calling detector that is not shown in the figure and operates line concentrator 17 to select disengaged subscriber's circuit 15. Then, circuit 15 feeds electric current to telephone set 1 by way of subscriber's line 2 and the value of the fed current is detected in circuit 15, etc., to select BN4 suitable for line 2 through balancing network BN selection controller 19, thereby connecting it to two-wire/four-wire converting circuit 3. Consequently, while line balance with the two-wire circuit is improved, the reflux of a calling current can be reduced to lessen the intraoffice tansmission loss of four-wire telephone set 11.
JP8349879A 1979-07-03 1979-07-03 Selection system for balancing connected network Pending JPS568981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8349879A JPS568981A (en) 1979-07-03 1979-07-03 Selection system for balancing connected network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8349879A JPS568981A (en) 1979-07-03 1979-07-03 Selection system for balancing connected network

Publications (1)

Publication Number Publication Date
JPS568981A true JPS568981A (en) 1981-01-29

Family

ID=13804134

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8349879A Pending JPS568981A (en) 1979-07-03 1979-07-03 Selection system for balancing connected network

Country Status (1)

Country Link
JP (1) JPS568981A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138833A (en) * 1983-12-26 1985-07-23 Jeol Ltd Mass spectrograph
JPS61259449A (en) * 1985-05-13 1986-11-17 Jeol Ltd Double convergence mass spectrograph

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60138833A (en) * 1983-12-26 1985-07-23 Jeol Ltd Mass spectrograph
JPS61259449A (en) * 1985-05-13 1986-11-17 Jeol Ltd Double convergence mass spectrograph
JPH0357574B2 (en) * 1985-05-13 1991-09-02 Nippon Electron Optics Lab

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