JPS56132849A - Call signal controlling circuit - Google Patents

Call signal controlling circuit

Info

Publication number
JPS56132849A
JPS56132849A JP3645980A JP3645980A JPS56132849A JP S56132849 A JPS56132849 A JP S56132849A JP 3645980 A JP3645980 A JP 3645980A JP 3645980 A JP3645980 A JP 3645980A JP S56132849 A JPS56132849 A JP S56132849A
Authority
JP
Japan
Prior art keywords
circuit
call signal
information
state
switching
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
JP3645980A
Other languages
Japanese (ja)
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 JP3645980A priority Critical patent/JPS56132849A/en
Publication of JPS56132849A publication Critical patent/JPS56132849A/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
    • H04M3/06—Calling substations, e.g. by ringing the calling signal being supplied from the subscriber's line circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To make it possible to prevent an operation error of a ringing trip detecting circuit, which is caused by a noise, by controlling the change-over switch of a call signal by logical sum of the information of both the memory circuit for holding its state, and the monitoring circuits of both the ringing trip and the subscriber's state. CONSTITUTION:Change-over switches tr1, tr2 for separating a call signal sending- out circuit from the channel 102, and storage circuit 206 for holding its switching state are provided on a subscriber's circuit of the switchboard. And, said circuit is constituted so that the change-over switches tr1, tr2 are controlled by use of a logical sum output of the supervisory information of the ringing trip monitoring circuit 105 and the subscriber's state monitoring circuit 104, and the information of the storage circuit 206. For instance, a call signal is sent out by setting the storage circuit 206 by a signal line 110 from the control circuit CC, driving the switching relay TR by the OR circuit 200 and the driving transistor 107, and switching the switching contacts tr1, tr2 to the make-side. And, even in the event of an operation error of the detecting circuit 105, a call signal is sent out continuously unless the information of the monitoring circuit 104 is confirmed by the control device CC.
JP3645980A 1980-03-21 1980-03-21 Call signal controlling circuit Pending JPS56132849A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3645980A JPS56132849A (en) 1980-03-21 1980-03-21 Call signal controlling circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3645980A JPS56132849A (en) 1980-03-21 1980-03-21 Call signal controlling circuit

Publications (1)

Publication Number Publication Date
JPS56132849A true JPS56132849A (en) 1981-10-17

Family

ID=12470398

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3645980A Pending JPS56132849A (en) 1980-03-21 1980-03-21 Call signal controlling circuit

Country Status (1)

Country Link
JP (1) JPS56132849A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6182563A (en) * 1984-09-29 1986-04-26 Fujitsu Ltd Ring trip device
JPS63238756A (en) * 1986-11-13 1988-10-04 エスジーエス・マイクロエレットロニカ・エス・ピー・エー Telephone circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6182563A (en) * 1984-09-29 1986-04-26 Fujitsu Ltd Ring trip device
JPS63238756A (en) * 1986-11-13 1988-10-04 エスジーエス・マイクロエレットロニカ・エス・ピー・エー Telephone circuit

Similar Documents

Publication Publication Date Title
JPS56132849A (en) Call signal controlling circuit
JPS5787666A (en) Simple automatic answering telephone system
CA1142663A (en) Key telephone exclusion circuit
JPS56141648A (en) Automatic answering telephone set
JPS5591252A (en) Automatic answering telephone set
KR860000112Y1 (en) Electronic switching system
KR940003255A (en) Telephone hook change over device
JPS6489753A (en) Key telephone system
JPS5690662A (en) Extension calling system of key telephone set
GB1388037A (en) Automatic telephone answering machine
DK0686109T3 (en) Circuit for functional control of freelance relays
JPS5685968A (en) Channel switching system
JPS57183165A (en) Incoming connection system
JPS5787657A (en) Loudspeaker telephone system
JPS56136073A (en) Testing method for channel continuity of telephone switching system
JPS5617561A (en) Talking device
JPS551792A (en) Automatic response unit for automatic answering telephone
JPS5726949A (en) Power feeding system
JPS56140759A (en) Network controller for telephone circuit
GB2049358A (en) Telephone answering machine
JPS5775051A (en) Automatic answering telephone set
JPS647847A (en) Automatic transaction device
JPS57212802A (en) Automatic antenna device for car
JPS56132853A (en) Traffic controlling system
JPS57170664A (en) Howler signal transmitting system in time division switchboard