JPS5773589A - Subscriber's circuit - Google Patents
Subscriber's circuitInfo
- 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
- Japan
- Prior art keywords
- resisters
- subscriber
- terminal
- differential amplifier
- amplifier
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
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.
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 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6094593A (en) * | 1983-09-30 | 1985-05-27 | ミテル・コーポレーシヨン | 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54104712A (en) * | 1978-02-01 | 1979-08-17 | Mitel Canada Ltd | Telephone line circuit |
-
1980
- 1980-10-27 JP JP14932080A patent/JPS5773589A/en active Pending
Patent Citations (1)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6094593A (en) * | 1983-09-30 | 1985-05-27 | ミテル・コーポレーシヨン | 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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