JPS54139414A - Line lead-in system - Google Patents

Line lead-in system

Info

Publication number
JPS54139414A
JPS54139414A JP4656878A JP4656878A JPS54139414A JP S54139414 A JPS54139414 A JP S54139414A JP 4656878 A JP4656878 A JP 4656878A JP 4656878 A JP4656878 A JP 4656878A JP S54139414 A JPS54139414 A JP S54139414A
Authority
JP
Japan
Prior art keywords
circuit
subscriber
contact
relay
calling signal
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.)
Granted
Application number
JP4656878A
Other languages
Japanese (ja)
Other versions
JPS5820497B2 (en
Inventor
Tetsuo Takeshita
Shiro Enami
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 JP4656878A priority Critical patent/JPS5820497B2/en
Publication of JPS54139414A publication Critical patent/JPS54139414A/en
Publication of JPS5820497B2 publication Critical patent/JPS5820497B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To decrease the number of the line lead-in contacts of the subscriber circuit and thus to simplify the circuit constitution by providing the common break contact with the subscriber circuit formed into the groups with installation of the common break contact. CONSTITUTION:The subscriber circuit contains contact r0 and r1 of calling signal transmission relay R which switches the circuit possessing battery V1, transformer T and others constituting the DC current supply circuit to the calling signal transmission circuit possessing calling signal power source CR when the calling signal is transmitted. In such subscriber circuit, group common relay SGO and SG1 are provided in common to plural units of subscriber circuits, and make contact sg0 and sg1 are connected in series to contact r0 and r1. In addition, make contact s0 and s1 of lead-in relay S which connects subscriber test circuit TST1 and channel network test circuit TST2 with every subscriber circuit, along the transfer contact st0 and st1 of test switch relay ST. Thus, the current supply circuit is switched toward the transmission circuit at the test time of the subscriber side, and at the same time contact sg0 and sg1 of the transmission circuit to which the subscriber circuit belongs are actuated to secure connection of circuit TST1 via relay S. Thus, circuit TST2 is connected in parallel to the subscriber circuit when the channel is tested.
JP4656878A 1978-04-21 1978-04-21 Line lead-in method Expired JPS5820497B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4656878A JPS5820497B2 (en) 1978-04-21 1978-04-21 Line lead-in method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4656878A JPS5820497B2 (en) 1978-04-21 1978-04-21 Line lead-in method

Publications (2)

Publication Number Publication Date
JPS54139414A true JPS54139414A (en) 1979-10-29
JPS5820497B2 JPS5820497B2 (en) 1983-04-23

Family

ID=12750916

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4656878A Expired JPS5820497B2 (en) 1978-04-21 1978-04-21 Line lead-in method

Country Status (1)

Country Link
JP (1) JPS5820497B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160996A (en) * 1983-03-01 1984-09-11 三菱電機株式会社 High frequency firing fluorescent lamp illuminator
JPH0635456Y2 (en) * 1987-05-19 1994-09-14 松下電器産業株式会社 Inverter transformer
JPH0371597A (en) * 1989-08-09 1991-03-27 Kuwata Momoyo Apparatus for lighting discharge lamp

Also Published As

Publication number Publication date
JPS5820497B2 (en) 1983-04-23

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