JPS5428509A - Direct current piling system for 4-wire exchange - Google Patents

Direct current piling system for 4-wire exchange

Info

Publication number
JPS5428509A
JPS5428509A JP9421077A JP9421077A JPS5428509A JP S5428509 A JPS5428509 A JP S5428509A JP 9421077 A JP9421077 A JP 9421077A JP 9421077 A JP9421077 A JP 9421077A JP S5428509 A JPS5428509 A JP S5428509A
Authority
JP
Japan
Prior art keywords
direct current
wire exchange
piling system
current piling
wire
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
JP9421077A
Other languages
Japanese (ja)
Inventor
Tetsuo Takemura
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 JP9421077A priority Critical patent/JPS5428509A/en
Publication of JPS5428509A publication Critical patent/JPS5428509A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)

Abstract

PURPOSE:To avoid the defective contact for the mechanical contact of the channel by installing a resistance attenuator to the trunk in order to adjust the level of the carrier equipment and then supplying the DC current to the call line of the 4-wire telephone exchange.
JP9421077A 1977-08-08 1977-08-08 Direct current piling system for 4-wire exchange Pending JPS5428509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9421077A JPS5428509A (en) 1977-08-08 1977-08-08 Direct current piling system for 4-wire exchange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9421077A JPS5428509A (en) 1977-08-08 1977-08-08 Direct current piling system for 4-wire exchange

Publications (1)

Publication Number Publication Date
JPS5428509A true JPS5428509A (en) 1979-03-03

Family

ID=14103943

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9421077A Pending JPS5428509A (en) 1977-08-08 1977-08-08 Direct current piling system for 4-wire exchange

Country Status (1)

Country Link
JP (1) JPS5428509A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57112451A (en) * 1980-12-26 1982-07-13 Toray Industries Production of fiber web

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57112451A (en) * 1980-12-26 1982-07-13 Toray Industries Production of fiber web
JPS621028B2 (en) * 1980-12-26 1987-01-10 Toray Industries

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