JPS55125787A - Transmission system of audible frequency signal - Google Patents

Transmission system of audible frequency signal

Info

Publication number
JPS55125787A
JPS55125787A JP3449679A JP3449679A JPS55125787A JP S55125787 A JPS55125787 A JP S55125787A JP 3449679 A JP3449679 A JP 3449679A JP 3449679 A JP3449679 A JP 3449679A JP S55125787 A JPS55125787 A JP S55125787A
Authority
JP
Japan
Prior art keywords
push button
button signal
generating circuit
circuit
signal generating
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
JP3449679A
Other languages
Japanese (ja)
Inventor
Yoshihiko Katsura
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 JP3449679A priority Critical patent/JPS55125787A/en
Publication of JPS55125787A publication Critical patent/JPS55125787A/en
Pending 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
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)

Abstract

PURPOSE:To increase the usage efficiency of push button signal generating circuit in exchanger system, by using one push button signal generating circuit commonly and in time sharing manner by a plurality of trunks. CONSTITUTION:The exchanger is formed that the push button signal generation circuits 20-23 and the trunks 30-33 can be connected through the communication path switch 40. Further, the circuit 20 and the trunk 30 are connected via the communication path switch 40 and the push button signal designated with the central control unit 1 is delivered from the circuit 20 to the opposing station via the trunk 30. Next, after the time required for the reception of the push button signal is elapsed for the opposing station, the connection of the switch 40 is opened. By repeating this every digit of the push button signal, one push button signal generating circuit can be used in time sharing manner, allowing to increase the usage efficiency.
JP3449679A 1979-03-23 1979-03-23 Transmission system of audible frequency signal Pending JPS55125787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3449679A JPS55125787A (en) 1979-03-23 1979-03-23 Transmission system of audible frequency signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3449679A JPS55125787A (en) 1979-03-23 1979-03-23 Transmission system of audible frequency signal

Publications (1)

Publication Number Publication Date
JPS55125787A true JPS55125787A (en) 1980-09-27

Family

ID=12415852

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3449679A Pending JPS55125787A (en) 1979-03-23 1979-03-23 Transmission system of audible frequency signal

Country Status (1)

Country Link
JP (1) JPS55125787A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61169094A (en) * 1985-01-22 1986-07-30 Nec Corp Pb signal transmission circuit
JPS62208791A (en) * 1986-03-10 1987-09-14 Hitachi Ltd Digital signal trunk
JPS6327191A (en) * 1986-07-18 1988-02-04 Sanyo Electric Co Ltd Pb signal transmitting method for private digital electronic exchange

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61169094A (en) * 1985-01-22 1986-07-30 Nec Corp Pb signal transmission circuit
JPS62208791A (en) * 1986-03-10 1987-09-14 Hitachi Ltd Digital signal trunk
JPS6327191A (en) * 1986-07-18 1988-02-04 Sanyo Electric Co Ltd Pb signal transmitting method for private digital electronic exchange

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