JPS5773589A - Subscriber's circuit - Google Patents

Subscriber's circuit

Info

Publication number
JPS5773589A
JPS5773589A JP14932080A JP14932080A JPS5773589A JP S5773589 A JPS5773589 A JP S5773589A JP 14932080 A JP14932080 A JP 14932080A JP 14932080 A JP14932080 A JP 14932080A JP S5773589 A JPS5773589 A JP S5773589A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
resisters
subscriber
applied
differential amplifier
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.)
Pending
Application number
JP14932080A
Inventor
Nobuyuki Miyahara
Original Assignee
Oki Electric Ind 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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/005Interface circuits for subscriber lines

Abstract

PURPOSE:To produce a miniaturized light weight subscriber's circuit with high density by installing 3 amplitifers and plural resistors for preventing the round routing of signals. CONSTITUTION:DC corerentIis supplied to a subscriber's terminals SUB through transistors Q10, Q11 and resisters R10, R11. A signal from the subscriber's terminal SUB is applied to a differential amplifier OP10 through resisters R16, R17, which are considerably larger than the resisters R10, R11, and capactiros C10, C11 and an output from the differential amplifier OP10 is sent to a terminal TA. A signal outputted from the terminal TA is applied to a differential amplifier OP11 through resisters R22, R24, R25. An output from the amplifier OP11 is supplied to the transistor Q10 through a capacitor C12 and, simultaneously, applied to the transistor Q11 through an inversion amplifier OP12 and a capacitor C13 to send the signal to the subscriber's terminal SUB. Thus, the round routing of signals can be prevented by setting up the values of the resisters R18, R19 and R23, R24, R25, R26 appropriately.
JP14932080A 1980-10-27 1980-10-27 Subscriber's circuit Pending JPS5773589A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14932080A JPS5773589A (en) 1980-10-27 1980-10-27 Subscriber's circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14932080A JPS5773589A (en) 1980-10-27 1980-10-27 Subscriber's circuit

Publications (1)

Publication Number Publication Date
JPS5773589A true true JPS5773589A (en) 1982-05-08

Family

ID=15472535

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14932080A Pending JPS5773589A (en) 1980-10-27 1980-10-27 Subscriber's circuit

Country Status (1)

Country Link
JP (1) JPS5773589A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6094593A (en) * 1983-09-30 1985-05-27 Mitel Corp Interface circuit, voice data interface circuit and method of interfacing voide data signal in circuit
US4661978A (en) * 1983-12-28 1987-04-28 Nec Corporation Subscriber line interface circuit having an impedence synthesizer
US4752952A (en) * 1984-05-18 1988-06-21 Thomson-Csf Telephone Subscriber circuit link interface for an automatic telephone exchange

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54104712A (en) * 1978-02-01 1979-08-17 Mitel Canada Ltd Telephone line circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54104712A (en) * 1978-02-01 1979-08-17 Mitel Canada Ltd Telephone line circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6094593A (en) * 1983-09-30 1985-05-27 Mitel Corp Interface circuit, voice data interface circuit and method of interfacing voide data signal in circuit
US4661978A (en) * 1983-12-28 1987-04-28 Nec Corporation Subscriber line interface circuit having an impedence synthesizer
US4752952A (en) * 1984-05-18 1988-06-21 Thomson-Csf Telephone Subscriber circuit link interface for an automatic telephone exchange

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