JPS55100776A - Answer supervisory system - Google Patents

Answer supervisory system

Info

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
Application number
JP777479A
Other languages
Japanese (ja)
Other versions
JPS5851465B2 (en
Inventor
Nobuyoshi Akiyama
Shogo Usuda
Yoshinori Oikawa
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP777479A priority Critical patent/JPS5851465B2/en
Publication of JPS55100776A publication Critical patent/JPS55100776A/en
Publication of JPS5851465B2 publication Critical patent/JPS5851465B2/en
Expired legal-status Critical Current

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
JP777479A 1979-01-26 1979-01-26 Response monitoring method Expired JPS5851465B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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