JPS57210765A - Telephone exchanger - Google Patents

Telephone exchanger

Info

Publication number
JPS57210765A
JPS57210765A JP9509481A JP9509481A JPS57210765A JP S57210765 A JPS57210765 A JP S57210765A JP 9509481 A JP9509481 A JP 9509481A JP 9509481 A JP9509481 A JP 9509481A JP S57210765 A JPS57210765 A JP S57210765A
Authority
JP
Japan
Prior art keywords
subscriber
tone
circuit
crossbar switch
cpu
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
JP9509481A
Other languages
Japanese (ja)
Inventor
Tsutomu Kunida
Junya Ishizaki
Taro Matsui
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 JP9509481A priority Critical patent/JPS57210765A/en
Publication of JPS57210765A publication Critical patent/JPS57210765A/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 flow busy tone and howler tone among subscribers with a simple circuit, by efficiently using functions such as a crossbar switch and an outgoing register. CONSTITUTION:A part which is conventional called as a market is repalced with a CPU 12. When the subscriber 1 hooks up a handset, a subscriber circuit 4 de- tects it and is connected to the CPU 12. The CPU 12 seeks a vacant link of a crossbar switch 7 and connects the line up to an outgoing register 9, seeks a called party and if the party is busy, the outgoing register 9 is turned off and the line is disconnected. Thus, the crossbar switch 7 can immediately have vacant lines and the switch can be used for other calls. The circuit 4 detects the register 9 which is turned off and connects an applying line 3' to the circuit 4 itself and this is given to the subscriber 1. In this case, the crossbar switch 7 and the trunks are not used at all. After a busy tone is given to the subscriber 1 for a prescribed time, if the subscribers does not return the handset to the original state yet, the tone is switched into a howler tone.
JP9509481A 1981-06-19 1981-06-19 Telephone exchanger Pending JPS57210765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9509481A JPS57210765A (en) 1981-06-19 1981-06-19 Telephone exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9509481A JPS57210765A (en) 1981-06-19 1981-06-19 Telephone exchanger

Publications (1)

Publication Number Publication Date
JPS57210765A true JPS57210765A (en) 1982-12-24

Family

ID=14128309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9509481A Pending JPS57210765A (en) 1981-06-19 1981-06-19 Telephone exchanger

Country Status (1)

Country Link
JP (1) JPS57210765A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51138309A (en) * 1975-05-26 1976-11-29 Hitachi Ltd Originating subscriber control system at a time of all origi nating registers being busy
JPS55125763A (en) * 1979-03-23 1980-09-27 Nec Corp Automatic howler tone transmission system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51138309A (en) * 1975-05-26 1976-11-29 Hitachi Ltd Originating subscriber control system at a time of all origi nating registers being busy
JPS55125763A (en) * 1979-03-23 1980-09-27 Nec Corp Automatic howler tone transmission system

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