JPS5746563A - Call signal generating device - Google Patents

Call signal generating device

Info

Publication number
JPS5746563A
JPS5746563A JP12196980A JP12196980A JPS5746563A JP S5746563 A JPS5746563 A JP S5746563A JP 12196980 A JP12196980 A JP 12196980A JP 12196980 A JP12196980 A JP 12196980A JP S5746563 A JPS5746563 A JP S5746563A
Authority
JP
Japan
Prior art keywords
lines
generating device
relay
signal generating
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.)
Pending
Application number
JP12196980A
Other languages
Japanese (ja)
Inventor
Susumu Iwasaki
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 JP12196980A priority Critical patent/JPS5746563A/en
Publication of JPS5746563A publication Critical patent/JPS5746563A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/02—Calling substations, e.g. by ringing

Abstract

PURPOSE:To form an output pattern where the potential between subscriber's lines is not changed before and after closing and opening of a relay, by using a signal generator which can generate a call signal with a DC voltage superposed. CONSTITUTION:In respect to outputs RA and RB of a signal generating device, frequency and crest value intermittent timings and DC voltages to be superposed are controlled in accordance with the program logic of a microprocessor incorporated in the device and control data set preliminarily. The control system of the main body of an exchange receives a timing signal TMG from the signal generating device and controls a relay R of the subscriber's circuit in accordance with the time of turning- off of outputs RA and RB. In respective subscriber's lines, -48V and earth are supplied to lines A and B respectively normally, and the relay R is so controlled that potential change does not occur in lines A and B before and after opening/closing, thus supplying the call signal to subscribers.
JP12196980A 1980-09-03 1980-09-03 Call signal generating device Pending JPS5746563A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12196980A JPS5746563A (en) 1980-09-03 1980-09-03 Call signal generating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12196980A JPS5746563A (en) 1980-09-03 1980-09-03 Call signal generating device

Publications (1)

Publication Number Publication Date
JPS5746563A true JPS5746563A (en) 1982-03-17

Family

ID=14824349

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12196980A Pending JPS5746563A (en) 1980-09-03 1980-09-03 Call signal generating device

Country Status (1)

Country Link
JP (1) JPS5746563A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61212153A (en) * 1985-03-15 1986-09-20 Fujitsu Ltd Call signal generating device
US5406623A (en) * 1993-04-23 1995-04-11 At&T Corp. Method and apparatus for ringing telephone stations

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61212153A (en) * 1985-03-15 1986-09-20 Fujitsu Ltd Call signal generating device
US5406623A (en) * 1993-04-23 1995-04-11 At&T Corp. Method and apparatus for ringing telephone stations

Similar Documents

Publication Publication Date Title
ATE484106T1 (en) METHOD FOR CONTROLLING POWER CONSUMPTION FOR A TDMA RADIO DEVICE
ES8706233A1 (en) Current loop arrangements.
JPS5746563A (en) Call signal generating device
JPS57105016A (en) Clock source switching system
GB1444067A (en) Control arrangement
JPS5534518A (en) Lsi parameter setting system
JPS57193182A (en) Super signal inserting circuit
JPS5456835A (en) signal inputting method
JPS55151839A (en) Automatic level control circuit for telephone
JPS6468055A (en) Modem telephone set
JPS56129577A (en) Current control device of thyristor converter circuit
JPS56123171A (en) Telephone switchboard
GB908794A (en) Apparatus for generating signals at random time intervals
PL144151B1 (en) Method of modulation of pulse width of electronic circuit,especially for pulse power supply unit
GB1148439A (en) Improvements in d.c. to a.c. inverters
JPS5783880A (en) Switch control method of matching system
FR2430137A1 (en) Sequential control system for air filtration unit - uses pulse generator and multi-stage register with initialisation circuit
JPS57111470A (en) Logical-waveform generation circuit
FR2305098A1 (en) Telephone circuit tester - compares circuit with standard circuit using two permanently connected bus systems
JPS6465997A (en) System for announcing line switching of pbx
JPS56134881A (en) Synchronism regulator and synchronizer
KR960008421B1 (en) Ring signal supplying method in zero-crossing
JPH03114074U (en)
JPS553289A (en) Time control device for vehicle
JPS57206276A (en) Control circuit for pulse-width modulation type inverter