JPS58111442A - 信号伝送路における折返しル−プ形成方法 - Google Patents

信号伝送路における折返しル−プ形成方法

Info

Publication number
JPS58111442A
JPS58111442A JP56207975A JP20797581A JPS58111442A JP S58111442 A JPS58111442 A JP S58111442A JP 56207975 A JP56207975 A JP 56207975A JP 20797581 A JP20797581 A JP 20797581A JP S58111442 A JPS58111442 A JP S58111442A
Authority
JP
Japan
Prior art keywords
relay
power supply
signal transmission
contact
contacts
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
JP56207975A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6237571B2 (enExample
Inventor
Tetsumasa Ooyama
大山　哲政
Takao Gotoda
後藤田　卓男
Akihiko Takada
昭彦 高田
Hiroyuki Noguchi
野口　浩幸
Masaharu Shimada
正治 島田
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.)
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone 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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP56207975A priority Critical patent/JPS58111442A/ja
Publication of JPS58111442A publication Critical patent/JPS58111442A/ja
Publication of JPS6237571B2 publication Critical patent/JPS6237571B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back
    • 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
    • H04M3/301—Circuit arrangements at the subscriber's side of the line

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
JP56207975A 1981-12-24 1981-12-24 信号伝送路における折返しル−プ形成方法 Granted JPS58111442A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56207975A JPS58111442A (ja) 1981-12-24 1981-12-24 信号伝送路における折返しル−プ形成方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56207975A JPS58111442A (ja) 1981-12-24 1981-12-24 信号伝送路における折返しル−プ形成方法

Publications (2)

Publication Number Publication Date
JPS58111442A true JPS58111442A (ja) 1983-07-02
JPS6237571B2 JPS6237571B2 (enExample) 1987-08-13

Family

ID=16548599

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56207975A Granted JPS58111442A (ja) 1981-12-24 1981-12-24 信号伝送路における折返しル−プ形成方法

Country Status (1)

Country Link
JP (1) JPS58111442A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02254049A (ja) * 1989-03-28 1990-10-12 Masaharu Morita ウオシャーノズルを取付けた車用ワイパー
JP5375468B2 (ja) * 2009-09-11 2013-12-25 富士通株式会社 伝送路測定装置、測定方法及びコンピュータプログラム

Also Published As

Publication number Publication date
JPS6237571B2 (enExample) 1987-08-13

Similar Documents

Publication Publication Date Title
JP2804633B2 (ja) 光折り返し／媒体試験器
US2229090A (en) Switching of spare repeater sections
US5420886A (en) Digital transmission equipment
US4301334A (en) Telecommunication subscriber line access circuit with ground key and insulation fault indication
EP0091267B1 (en) Telecommunication system loop-back unit
JPS58111442A (ja) 信号伝送路における折返しル−プ形成方法
US2389076A (en) Testing arrangement for trunks to community dial offices
GB2253543A (en) Testing circuit for data transmission lines
EP0460087B1 (en) Star data network with logical ring function preferably using token access
US4485271A (en) Remotely actuable line disconnect device
US4620187A (en) Transformer coupled, solid state communications line switch
EP1906546B1 (en) A broad-narrow band integrated board and method for testing said board
NL7909148A (nl) Lijnstroom-voedingscircuit voor een telecommunicatie- centrale.
US2804504A (en) Direct call secrecy intercommunication system
JPS6052635B2 (ja) ボタン電話装置における主装置間接続方式
US3410965A (en) D. c. signalling system
US2069223A (en) Interconnecting telegraph repeater system
CA1045232A (en) Trunk busy test circuit
JP2002142020A (ja) ハイブリッドトランスを用いた折返し試験方法、及びそれに用いられる回線終端装置
US1836549A (en) Telephone exchange system
KR200177378Y1 (ko) 케이블 접속보드에서 테스트를 위한 결선 장치
US1199783A (en) Lockout for party-lines or extension-telephones.
US1617482A (en) Intermediate telegraph set for duplex lines
US1175104A (en) Telephone system.
US1355957A (en) Telephone transmission system