JPS55100776A - Answer supervisory system - Google Patents
Answer supervisory systemInfo
- Publication number
- JPS55100776A JPS55100776A JP777479A JP777479A JPS55100776A JP S55100776 A JPS55100776 A JP S55100776A JP 777479 A JP777479 A JP 777479A JP 777479 A JP777479 A JP 777479A JP S55100776 A JPS55100776 A JP S55100776A
- Authority
- JP
- Japan
- Prior art keywords
- subscriber
- swo
- answer
- coded
- called
- 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.)
- Granted
Links
Landscapes
- Devices For Supply Of Signal Current (AREA)
Abstract
PURPOSE: To realize an easily-IC-implemented answer supervisory system detecting the answer of a called subscriber by supplying a calling current, when the called subscriber is called, to a coder circuit through a differential amplifier and then by exercising a supervision over its coding output.
CONSTITUTION: While a subscriber not shown in the figure connected to terminals A and B is busy, contacts SWO0 to SWO2 are changed over from the positions shown in the figure and the subscriber is connected to a digital exchange, not shown in the figure, by way of two-wire/four-wire converter HYB with balancing network BNW, band-pass and low-pass filters BPF and LPF, and coding-decoding circuit CODEC. When a call is made, switches SWO0 and SWO2 are placed as shown in the figure and calling signal IR and DC source E0 are applied to the subscriber. A signal generated by resistance RF is coded by CODEC through differential amplifier OPAO. A decision circuit not shown in the figure exercises a supervison over the coded calling signal current and detects the answer of the subscriber when a DC component is coded.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP777479A JPS5851465B2 (en) | 1979-01-26 | 1979-01-26 | Response monitoring method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP777479A JPS5851465B2 (en) | 1979-01-26 | 1979-01-26 | Response monitoring method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55100776A true JPS55100776A (en) | 1980-07-31 |
JPS5851465B2 JPS5851465B2 (en) | 1983-11-16 |
Family
ID=11675016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP777479A Expired JPS5851465B2 (en) | 1979-01-26 | 1979-01-26 | Response monitoring method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5851465B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57109449A (en) * | 1980-12-26 | 1982-07-07 | Masao Uchiumi | Call detecting circuit |
JPS57184359A (en) * | 1981-05-08 | 1982-11-13 | Nec Corp | Ring trip circuit |
JPS6072458A (en) * | 1983-09-29 | 1985-04-24 | Oki Electric Ind Co Ltd | Subscriber circuit signal processing system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60236282A (en) * | 1984-05-09 | 1985-11-25 | ロ−ム株式会社 | Electronic circuit board |
-
1979
- 1979-01-26 JP JP777479A patent/JPS5851465B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57109449A (en) * | 1980-12-26 | 1982-07-07 | Masao Uchiumi | Call detecting circuit |
JPS6159582B2 (en) * | 1980-12-26 | 1986-12-17 | Masao Uchiumi | |
JPS57184359A (en) * | 1981-05-08 | 1982-11-13 | Nec Corp | Ring trip circuit |
JPS6072458A (en) * | 1983-09-29 | 1985-04-24 | Oki Electric Ind Co Ltd | Subscriber circuit signal processing system |
Also Published As
Publication number | Publication date |
---|---|
JPS5851465B2 (en) | 1983-11-16 |
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