JPS53128208A - Ringer signal detector circuit - Google Patents

Ringer signal detector circuit

Info

Publication number
JPS53128208A
JPS53128208A JP4325777A JP4325777A JPS53128208A JP S53128208 A JPS53128208 A JP S53128208A JP 4325777 A JP4325777 A JP 4325777A JP 4325777 A JP4325777 A JP 4325777A JP S53128208 A JPS53128208 A JP S53128208A
Authority
JP
Japan
Prior art keywords
detector circuit
signal detector
ringer signal
ringer
pbx
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
JP4325777A
Other languages
Japanese (ja)
Inventor
Kunio Nagashima
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 JP4325777A priority Critical patent/JPS53128208A/en
Publication of JPS53128208A publication Critical patent/JPS53128208A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H04Q3/625—Arrangements in the private branch exchange

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To obtain the terminating information without causing any call loss by detecting the potential inversion between the main wires through the operational amplifier at the trunk of PBX.
JP4325777A 1977-04-14 1977-04-14 Ringer signal detector circuit Pending JPS53128208A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4325777A JPS53128208A (en) 1977-04-14 1977-04-14 Ringer signal detector circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4325777A JPS53128208A (en) 1977-04-14 1977-04-14 Ringer signal detector circuit

Publications (1)

Publication Number Publication Date
JPS53128208A true JPS53128208A (en) 1978-11-09

Family

ID=12658796

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4325777A Pending JPS53128208A (en) 1977-04-14 1977-04-14 Ringer signal detector circuit

Country Status (1)

Country Link
JP (1) JPS53128208A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55105485A (en) * 1979-02-07 1980-08-13 Nec Corp Trunk circuit of automatic telephone exchange
JPS59182699A (en) * 1983-03-31 1984-10-17 Fujitsu Ltd Circuit for detecting call signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55105485A (en) * 1979-02-07 1980-08-13 Nec Corp Trunk circuit of automatic telephone exchange
JPS6214159B2 (en) * 1979-02-07 1987-03-31 Nippon Electric Co
JPS59182699A (en) * 1983-03-31 1984-10-17 Fujitsu Ltd Circuit for detecting call signal

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