[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JPS56106492A - Detection circuit of subscriber's earth - Google Patents

Detection circuit of subscriber's earth

Info

Publication number
JPS56106492A
JPS56106492A JP796680A JP796680A JPS56106492A JP S56106492 A JPS56106492 A JP S56106492A JP 796680 A JP796680 A JP 796680A JP 796680 A JP796680 A JP 796680A JP S56106492 A JPS56106492 A JP S56106492A
Authority
JP
Japan
Prior art keywords
earth
terminal
detection information
logic
information
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
JP796680A
Other languages
Japanese (ja)
Inventor
Kazumoto Tsuruta
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 JP796680A priority Critical patent/JPS56106492A/en
Publication of JPS56106492A publication Critical patent/JPS56106492A/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)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To ensure a stable detection of earth transmission information, by detecting a potential drop of the same resistance at both the earth side and the power source side of a talking circuit and then monitoring the difference of the potential drop. CONSTITUTION:A potential drop is caused at the resistances RA and RB by the call current in a talking mode, and the amplifiers 10 and 11 detect the difference of potential between the resistances. The call detection information of logic ''0'' is delivered to the terminal 16; while the earth undetection information of logic ''0'' is given to the earth detection information terminal 17. When the subscriber pushes the earth transmission button 18, the ligic ''0'', i.e., the call detection information is given continuously to the terminal 16. While the logic ''1'', i.e., the earth detection information is delivered to the terminal 17.
JP796680A 1980-01-25 1980-01-25 Detection circuit of subscriber's earth Pending JPS56106492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP796680A JPS56106492A (en) 1980-01-25 1980-01-25 Detection circuit of subscriber's earth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP796680A JPS56106492A (en) 1980-01-25 1980-01-25 Detection circuit of subscriber's earth

Publications (1)

Publication Number Publication Date
JPS56106492A true JPS56106492A (en) 1981-08-24

Family

ID=11680200

Family Applications (1)

Application Number Title Priority Date Filing Date
JP796680A Pending JPS56106492A (en) 1980-01-25 1980-01-25 Detection circuit of subscriber's earth

Country Status (1)

Country Link
JP (1) JPS56106492A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6480196A (en) * 1987-09-21 1989-03-27 Fujitsu Ltd Earth start detection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6480196A (en) * 1987-09-21 1989-03-27 Fujitsu Ltd Earth start detection circuit

Similar Documents

Publication Publication Date Title
JPS56106492A (en) Detection circuit of subscriber's earth
JPS52124810A (en) Information transmission
JPS5439510A (en) Detection circuit for outgoing call
JPS5731256A (en) Ncu circuit
JPS5443608A (en) Fault detector for contact signal transmission circuit
ES8705729A1 (en) Interswitch line circuit.
JPS5625867A (en) Information terminal unit with automatic line disconnecting function
JPS5496906A (en) Telephone set for both pb and dp signals
JPS5471347A (en) State detector
JPS5379565A (en) Interpnone circuit in data collecting circuit
JPS5368010A (en) Ring trip circuit
JPS56123160A (en) Trunk line channel fault monitoring system
JPS54103526A (en) Electrical route insulation resistance supervising device
JPS5799858A (en) Public terminal communication system
JPS5290049A (en) Earth detection circuit
JPS5596967A (en) Developer laminar state detector
JPS5793765A (en) Booster battery detecting system
JPS52101907A (en) Shunt type current switching scanning method
JPS5443606A (en) Fault detector for contact signal transmission circuit
JPS5443607A (en) Fault detector for contact signal transmission circuit
JPS56153863A (en) Pcm line switching system
JPS6467038A (en) Communication line disconnection detector
JPS6473851A (en) Terminal connection identifying system
JPS54103626A (en) Private line multiple transmission device
JPS5640983A (en) Pass rate detecting device