JPS5730456A - Ring tripping circuit - Google Patents

Ring tripping circuit

Info

Publication number
JPS5730456A
JPS5730456A JP10426980A JP10426980A JPS5730456A JP S5730456 A JPS5730456 A JP S5730456A JP 10426980 A JP10426980 A JP 10426980A JP 10426980 A JP10426980 A JP 10426980A JP S5730456 A JPS5730456 A JP S5730456A
Authority
JP
Japan
Prior art keywords
turns
resistance
voltage
ring
relay
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
JP10426980A
Other languages
Japanese (ja)
Inventor
Mitsuo Sato
Isao Matsumoto
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.)
Anritsu Corp
Original Assignee
Anritsu 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 Anritsu Corp filed Critical Anritsu Corp
Priority to JP10426980A priority Critical patent/JPS5730456A/en
Publication of JPS5730456A publication Critical patent/JPS5730456A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To take a ring trip stably by detecting the answer of an extension subscriber as variations in peak voltage. CONSTITUTION:When a subscriber SUB puts the handset off the hook, a voltage developed across a resistance R1 exceeds the threshold level of a Zener diode ZD1. When a photocoupler PC turns on and the time constant circuit of a resistance R3 and a capacitor C drops below a constant value, a Zener diode ZD2 turns off a transistor TR1. Consequently, a TR2 turns on to energize a relay FA. Through the operation of the relay FA, 20Hz transmission is stopped by contacts fa<1> and fa<2>, the voltage across resistance R1 is ceased, the voltage output of the time constant of a resistance R4 and the capacitor C is higher than the constant value, so that the ZD2 turns on the TR1 and off the TR2. Consequently, the setting of an AC nonoperating point as is the case with a DC-superposing ring tripping circuit is unnecessary, and a ring trip is taken securely.
JP10426980A 1980-07-31 1980-07-31 Ring tripping circuit Pending JPS5730456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10426980A JPS5730456A (en) 1980-07-31 1980-07-31 Ring tripping circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10426980A JPS5730456A (en) 1980-07-31 1980-07-31 Ring tripping circuit

Publications (1)

Publication Number Publication Date
JPS5730456A true JPS5730456A (en) 1982-02-18

Family

ID=14376198

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10426980A Pending JPS5730456A (en) 1980-07-31 1980-07-31 Ring tripping circuit

Country Status (1)

Country Link
JP (1) JPS5730456A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185296B1 (en) 1996-11-26 2001-02-06 Nec Corporation Ring trip circuit for stopping call signal at different timing from zero-crossing point of call signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838223A (en) * 1973-10-01 1974-09-24 Gte Automatic Electric Lab Inc Ring trip and dial pulse detection circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3838223A (en) * 1973-10-01 1974-09-24 Gte Automatic Electric Lab Inc Ring trip and dial pulse detection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6185296B1 (en) 1996-11-26 2001-02-06 Nec Corporation Ring trip circuit for stopping call signal at different timing from zero-crossing point of call signal

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