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JPS57203391A - Transmitting system for multifrequency signal of digital time division switchboard - Google Patents

Transmitting system for multifrequency signal of digital time division switchboard

Info

Publication number
JPS57203391A
JPS57203391A JP8868081A JP8868081A JPS57203391A JP S57203391 A JPS57203391 A JP S57203391A JP 8868081 A JP8868081 A JP 8868081A JP 8868081 A JP8868081 A JP 8868081A JP S57203391 A JPS57203391 A JP S57203391A
Authority
JP
Japan
Prior art keywords
circuit
signal
time division
subscriber
constitution
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
JP8868081A
Other languages
Japanese (ja)
Other versions
JPS6151480B2 (en
Inventor
Tadashi Nakanishi
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 JP8868081A priority Critical patent/JPS57203391A/en
Publication of JPS57203391A publication Critical patent/JPS57203391A/en
Publication of JPS6151480B2 publication Critical patent/JPS6151480B2/ja
Granted 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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form

Landscapes

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

Abstract

PURPOSE:To reduce the load of a central controller and to simplify the circuit constitution and to eliminate the blockade, by selecting the frequency signal required within a counter-station interface circuit and synthesizing a digital signal to obtain a multifrequency signal. CONSTITUTION:The signal supplied from a frequency generator 32 is multiplexed with other digital signals, etc. through a time division multiplexing circuit 38 and then supplied in common to the counter-station interface circuits 35A-35D via a common signal bus 39. When a subscriber 31 has a call and wants the connection with the circuit 35A, a central controller 36 delivers an instruction to connect the circuit 35A to the subscriber 31 by a time division switch 33 and via a multiplex channel 34. At the same time, the numerical information given from the subscriber 31 is monitored and transferred to the circuit 35A as a selection signal. The frequency corresponding to the selection signal is digitally synthesized to obtain a coded multifrequency signal. In such way, the load of the controller 36 is reduced, and the circuit constitution is simplified, furthermore, the blockade can be eliminated.
JP8868081A 1981-06-09 1981-06-09 Transmitting system for multifrequency signal of digital time division switchboard Granted JPS57203391A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8868081A JPS57203391A (en) 1981-06-09 1981-06-09 Transmitting system for multifrequency signal of digital time division switchboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8868081A JPS57203391A (en) 1981-06-09 1981-06-09 Transmitting system for multifrequency signal of digital time division switchboard

Publications (2)

Publication Number Publication Date
JPS57203391A true JPS57203391A (en) 1982-12-13
JPS6151480B2 JPS6151480B2 (en) 1986-11-08

Family

ID=13949539

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8868081A Granted JPS57203391A (en) 1981-06-09 1981-06-09 Transmitting system for multifrequency signal of digital time division switchboard

Country Status (1)

Country Link
JP (1) JPS57203391A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138364A2 (en) * 1983-09-15 1985-04-24 AT&T Corp. Multifrequency tone distribution using a conference arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138364A2 (en) * 1983-09-15 1985-04-24 AT&T Corp. Multifrequency tone distribution using a conference arrangement

Also Published As

Publication number Publication date
JPS6151480B2 (en) 1986-11-08

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