JPS5295904A - Inhouse line monitor circuit - Google Patents

Inhouse line monitor circuit

Info

Publication number
JPS5295904A
JPS5295904A JP1220476A JP1220476A JPS5295904A JP S5295904 A JPS5295904 A JP S5295904A JP 1220476 A JP1220476 A JP 1220476A JP 1220476 A JP1220476 A JP 1220476A JP S5295904 A JPS5295904 A JP S5295904A
Authority
JP
Japan
Prior art keywords
inhouse
monitor circuit
line monitor
telephones
shortened
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
JP1220476A
Other languages
Japanese (ja)
Inventor
Kazunori Fujita
Hiroo Iijima
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 JP1220476A priority Critical patent/JPS5295904A/en
Publication of JPS5295904A publication Critical patent/JPS5295904A/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:By detecting the conditions of communication current circuit, the condition detection time of inhouse telephones is shortened and the instrumentation space is saved.
JP1220476A 1976-02-09 1976-02-09 Inhouse line monitor circuit Pending JPS5295904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1220476A JPS5295904A (en) 1976-02-09 1976-02-09 Inhouse line monitor circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1220476A JPS5295904A (en) 1976-02-09 1976-02-09 Inhouse line monitor circuit

Publications (1)

Publication Number Publication Date
JPS5295904A true JPS5295904A (en) 1977-08-12

Family

ID=11798858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1220476A Pending JPS5295904A (en) 1976-02-09 1976-02-09 Inhouse line monitor circuit

Country Status (1)

Country Link
JP (1) JPS5295904A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5112710A (en) * 1974-07-22 1976-01-31 Tokyo Shibaura Electric Co KANYUSHAKAISEN JOTAIKENSHUTSUSOCHI

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5112710A (en) * 1974-07-22 1976-01-31 Tokyo Shibaura Electric Co KANYUSHAKAISEN JOTAIKENSHUTSUSOCHI

Similar Documents

Publication Publication Date Title
JPS5375804A (en) Individual selective calling device
JPS5221733A (en) Microsignal detection circuit
JPS53101203A (en) Selective calling receiver
JPS5234601A (en) Calling circuit
JPS52146102A (en) Terminal equipment in a simple data communicating system
JPS5228806A (en) Secret-talk circuit of push-button telephone device
JPS5220702A (en) Data terminal equipment
JPS5298405A (en) Office line monitoring circuit
JPS52120704A (en) Individual selection call receiver
JPS5368106A (en) Automatic dialing unit
JPS51130188A (en) Signal detection equipment
JPS538009A (en) Monitor system for leakage coaxial cables
JPS5296807A (en) Subscriber monitor unit
JPS5372514A (en) Fault detector of repeater
JPS51128212A (en) Received frequency indication
JPS5211067A (en) Electronic disital clockwork
JPS524720A (en) Two-ways constant current circuit
JPS5354904A (en) Dial signal transmission system
JPS5373001A (en) Test system of mobile communication equipment
JPS5387605A (en) Incoming detector circuit of telephone set sdditional unit
JPS51134645A (en) Liquid crystal dispray equipment
JPS5296803A (en) Telephone unit
JPS544007A (en) Identifying system of two terminals and two common subscribers
JPS5373009A (en) Privacy call circuit of button telephone device
JPS5468673A (en) Electronic watch