JPS52122015A - Line signal supervisor - Google Patents

Line signal supervisor

Info

Publication number
JPS52122015A
JPS52122015A JP3838776A JP3838776A JPS52122015A JP S52122015 A JPS52122015 A JP S52122015A JP 3838776 A JP3838776 A JP 3838776A JP 3838776 A JP3838776 A JP 3838776A JP S52122015 A JPS52122015 A JP S52122015A
Authority
JP
Japan
Prior art keywords
line signal
voltage
signal supervisor
supervisor
battery
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
JP3838776A
Other languages
Japanese (ja)
Inventor
Shigeru Kimura
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 JP3838776A priority Critical patent/JPS52122015A/en
Publication of JPS52122015A publication Critical patent/JPS52122015A/en
Pending 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
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To detect the line signal by comparing the voltage at the channel side of the resistance reducing the voltage by DC, that the earth potential and the battery coltage are supplied to the channel respectively with the battery and the voltage across the earth.
JP3838776A 1976-04-06 1976-04-06 Line signal supervisor Pending JPS52122015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3838776A JPS52122015A (en) 1976-04-06 1976-04-06 Line signal supervisor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3838776A JPS52122015A (en) 1976-04-06 1976-04-06 Line signal supervisor

Publications (1)

Publication Number Publication Date
JPS52122015A true JPS52122015A (en) 1977-10-13

Family

ID=12523857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3838776A Pending JPS52122015A (en) 1976-04-06 1976-04-06 Line signal supervisor

Country Status (1)

Country Link
JP (1) JPS52122015A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56156087A (en) * 1980-05-06 1981-12-02 Nec Corp Loop detecting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56156087A (en) * 1980-05-06 1981-12-02 Nec Corp Loop detecting circuit

Similar Documents

Publication Publication Date Title
SE7708543L (en) NON-METALLIC PRE-TREATED ELECTRODE
DK147585C (en) SINGLE CHANNEL IMPULS DOPPLE RADDER RECEIVER WITH SIDE LOAD DETECTION CIRCUIT
NL166887C (en) AIR TAPE FROM ELASTIC MATERIAL AND AT LEAST IN THE SHOULDER ZONES AND CHEEKS WITHOUT REINFORCEMENT.
AU2011376A (en) Current flow monitoring
NL7613730A (en) HIGH VOLTAGE ELECTROLYSER WITH LOW LOSS.
NL7709139A (en) THREE POINT SEAT BELT WITH DOUBLE SHOULDER BELT.
JPS5376678A (en) Semiconductor device
JPS5330840A (en) Reduction system of power consumption
JPS5363955A (en) Amplifier
JPS52119106A (en) Supervisory circuit for line signal
JPS53103137A (en) Ground directional relay
DE3688486D1 (en) DIFFERENTIAL AMPLIFIER WITH CURRENT CONTROL TO INCREASE THE OUTPUT SIGNAL INCREASE.
JPS5349989A (en) Superconductive coil
JPS5439561A (en) Turning off system of thyristor
FR1291086A (en) DC power system with back-up battery
JPS5310248A (en) Pulse generating circuit
SU613481A1 (en) Current amplifier with bridge output
JPS53120235A (en) Sense amplifier
CA603671A (en) Electrochemical electrode
JPS5317360A (en) Power consumption detecting device
JPS51126011A (en) Horizontal output trans
JPS52116157A (en) Pulse circuit
JPS5324757A (en) Subtraction circuit
JPS52113143A (en) Amplifier
JPS5375748A (en) Tuning amplifier