CA997874A - Signal interrupter circuit for a key telephone system - Google Patents

Signal interrupter circuit for a key telephone system

Info

Publication number
CA997874A
CA997874A CA186,717A CA186717A CA997874A CA 997874 A CA997874 A CA 997874A CA 186717 A CA186717 A CA 186717A CA 997874 A CA997874 A CA 997874A
Authority
CA
Canada
Prior art keywords
telephone system
key telephone
interrupter circuit
signal interrupter
signal
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.)
Expired
Application number
CA186,717A
Other languages
English (en)
Other versions
CA186717S (en
Inventor
Hachiroh Takubo
Fumio Tsutsumi
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 Tsushin Kogyo KK
Tie Communications Inc
Original Assignee
Nippon Tsushin Kogyo KK
Tie Communications Inc
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 Tsushin Kogyo KK, Tie Communications Inc filed Critical Nippon Tsushin Kogyo KK
Application granted granted Critical
Publication of CA997874A publication Critical patent/CA997874A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
CA186,717A 1973-01-09 1973-11-26 Signal interrupter circuit for a key telephone system Expired CA997874A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48004975A JPS4991704A (fr) 1973-01-09 1973-01-09

Publications (1)

Publication Number Publication Date
CA997874A true CA997874A (en) 1976-09-28

Family

ID=11598584

Family Applications (1)

Application Number Title Priority Date Filing Date
CA186,717A Expired CA997874A (en) 1973-01-09 1973-11-26 Signal interrupter circuit for a key telephone system

Country Status (3)

Country Link
US (1) US3818146A (fr)
JP (1) JPS4991704A (fr)
CA (1) CA997874A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916117A (en) * 1974-05-15 1975-10-28 Itt Key telephone interrupter
US3953683A (en) * 1974-10-29 1976-04-27 San/Bar Corporation Interrupter for telephone systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3471651A (en) * 1967-01-13 1969-10-07 Ibm Telephone ringing circuit

Also Published As

Publication number Publication date
JPS4991704A (fr) 1974-09-02
US3818146A (en) 1974-06-18

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