JPS55117398A - Surge protecting system for subscriber circuit - Google Patents

Surge protecting system for subscriber circuit

Info

Publication number
JPS55117398A
JPS55117398A JP2478379A JP2478379A JPS55117398A JP S55117398 A JPS55117398 A JP S55117398A JP 2478379 A JP2478379 A JP 2478379A JP 2478379 A JP2478379 A JP 2478379A JP S55117398 A JPS55117398 A JP S55117398A
Authority
JP
Japan
Prior art keywords
circuit
surge
current
voltage limit
resistance force
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
JP2478379A
Other languages
Japanese (ja)
Other versions
JPS5722507B2 (en
Inventor
Masahiko Ono
Shogo Usuda
Katsuzo Yamada
Tetsuo Takeshita
Takashi Usami
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.)
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
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 Fujitsu Ltd, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP2478379A priority Critical patent/JPS55117398A/en
Publication of JPS55117398A publication Critical patent/JPS55117398A/en
Publication of JPS5722507B2 publication Critical patent/JPS5722507B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Structure Of Telephone Exchanges (AREA)

Abstract

PURPOSE:To reduce the surge resistance force of the 2nd current/voltage limit circuit by absorbing the greater part of the surge energy at the 1st current/voltage limit circuit and then applying the leak surge to the 2nd current/voltage limit circuit. CONSTITUTION:When the surge protection is given for the subscriber circuit in the time-division exchange, the surge due to the thunder or the like and applied to subscriber lines 2 and 3 is absorbed by the 1st current/voltage limit circuit 4 for the greater part of the energy. In that case, the limit value of these current and voltage is set so high as not to disturb the transmission of the large-amplitude call signal which is sent out to subscriber terminal 1 from call signal sending circuit 10. And switches 13 and 14 are opened in order to apply only the leak surge which could not be absorbed into circuit 4 to the 2nd current/voltage limit circuit 15. Thus the circuit featuring the low surge resistance force can be well used for circuit 15, and accordingly the surge resistance force can be reduced for circuit 15.
JP2478379A 1979-03-02 1979-03-02 Surge protecting system for subscriber circuit Granted JPS55117398A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2478379A JPS55117398A (en) 1979-03-02 1979-03-02 Surge protecting system for subscriber circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2478379A JPS55117398A (en) 1979-03-02 1979-03-02 Surge protecting system for subscriber circuit

Publications (2)

Publication Number Publication Date
JPS55117398A true JPS55117398A (en) 1980-09-09
JPS5722507B2 JPS5722507B2 (en) 1982-05-13

Family

ID=12147773

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2478379A Granted JPS55117398A (en) 1979-03-02 1979-03-02 Surge protecting system for subscriber circuit

Country Status (1)

Country Link
JP (1) JPS55117398A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456940A (en) * 1980-12-23 1984-06-26 Telefonaktiebolaget L M Ericsson Voltage controlled transient protection unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4456940A (en) * 1980-12-23 1984-06-26 Telefonaktiebolaget L M Ericsson Voltage controlled transient protection unit

Also Published As

Publication number Publication date
JPS5722507B2 (en) 1982-05-13

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