JPS57170664A - Howler signal transmitting system in time division switchboard - Google Patents

Howler signal transmitting system in time division switchboard

Info

Publication number
JPS57170664A
JPS57170664A JP5642981A JP5642981A JPS57170664A JP S57170664 A JPS57170664 A JP S57170664A JP 5642981 A JP5642981 A JP 5642981A JP 5642981 A JP5642981 A JP 5642981A JP S57170664 A JPS57170664 A JP S57170664A
Authority
JP
Japan
Prior art keywords
circuit
subscriber
signal generating
controls
howler
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
JP5642981A
Other languages
Japanese (ja)
Inventor
Akira Harada
Toshio Shoji
Toshio Adachi
Tsutomu Uchiumi
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.)
KEISATSUCHIYOU CHIYOUKAN
KEISATSUCHIYOU CHOKAN
TAIKOU DENKI SEISAKUSHO KK
Taiko Electric Works Ltd
Original Assignee
KEISATSUCHIYOU CHIYOUKAN
KEISATSUCHIYOU CHOKAN
TAIKOU DENKI SEISAKUSHO KK
Taiko Electric Works 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 KEISATSUCHIYOU CHIYOUKAN, KEISATSUCHIYOU CHOKAN, TAIKOU DENKI SEISAKUSHO KK, Taiko Electric Works Ltd filed Critical KEISATSUCHIYOU CHIYOUKAN
Priority to JP5642981A priority Critical patent/JPS57170664A/en
Publication of JPS57170664A publication Critical patent/JPS57170664A/en
Pending legal-status Critical Current

Links

Classifications

    • 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)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To enable common use of a connecting route by connecting a call signal generating circuit and a howler signal generating circuit with a subscriber's circuit through a changeover control circuit that switches the two circuit selectively. CONSTITUTION:When a calling subscriber selects a called subscriber's telephone set 1, a common control section 4 controls the subscriber's circuit 2 and drives a switch 10. At the same time, a changeover control circuit 9 is operated and made to control to send out signal output of a call signal generating circuit 5 to a connecting route 11. On the other hand, if the selection signal is not sent out for a specified time after of-hook of the telephone set 1, the common control section 4 controls the subscriber's circuit 4 by a signal from a loop and ringing trip detecting circuit 3, and drives the switch 10. At the same time, it operates the changeover circuit 9 and controls to send out signal output of the howler signal generating circuit 6 to the connecting route 11.
JP5642981A 1981-04-14 1981-04-14 Howler signal transmitting system in time division switchboard Pending JPS57170664A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5642981A JPS57170664A (en) 1981-04-14 1981-04-14 Howler signal transmitting system in time division switchboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5642981A JPS57170664A (en) 1981-04-14 1981-04-14 Howler signal transmitting system in time division switchboard

Publications (1)

Publication Number Publication Date
JPS57170664A true JPS57170664A (en) 1982-10-20

Family

ID=13026841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5642981A Pending JPS57170664A (en) 1981-04-14 1981-04-14 Howler signal transmitting system in time division switchboard

Country Status (1)

Country Link
JP (1) JPS57170664A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523318A (en) * 1975-06-24 1977-01-11 Nec Corp Howler circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523318A (en) * 1975-06-24 1977-01-11 Nec Corp Howler circuit

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