JPS53105306A - Detection system for calling - Google Patents

Detection system for calling

Info

Publication number
JPS53105306A
JPS53105306A JP1926577A JP1926577A JPS53105306A JP S53105306 A JPS53105306 A JP S53105306A JP 1926577 A JP1926577 A JP 1926577A JP 1926577 A JP1926577 A JP 1926577A JP S53105306 A JPS53105306 A JP S53105306A
Authority
JP
Japan
Prior art keywords
calling
detection system
noise
insuced
detecttion
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
JP1926577A
Other languages
Japanese (ja)
Other versions
JPS5647755B2 (en
Inventor
Akira Kikuchi
Nobuyoshi Akiyama
Toshio Arai
Takashi Sugioka
Tetsuo Takeshita
Takuji Mukaemachi
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.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Oki Electric Industry 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 Hitachi Ltd, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd filed Critical Hitachi Ltd
Priority to JP1926577A priority Critical patent/JPS53105306A/en
Publication of JPS53105306A publication Critical patent/JPS53105306A/en
Publication of JPS5647755B2 publication Critical patent/JPS5647755B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To reject the noise of telephone at calling detecttion scanning and the insuced noise to the adjacent subscriber lines and to prevent the lowering in detection margin, by using the loop detection circuit in time division multiplex with the switches for leading in.
JP1926577A 1977-02-25 1977-02-25 Detection system for calling Granted JPS53105306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1926577A JPS53105306A (en) 1977-02-25 1977-02-25 Detection system for calling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1926577A JPS53105306A (en) 1977-02-25 1977-02-25 Detection system for calling

Publications (2)

Publication Number Publication Date
JPS53105306A true JPS53105306A (en) 1978-09-13
JPS5647755B2 JPS5647755B2 (en) 1981-11-11

Family

ID=11994598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1926577A Granted JPS53105306A (en) 1977-02-25 1977-02-25 Detection system for calling

Country Status (1)

Country Link
JP (1) JPS53105306A (en)

Also Published As

Publication number Publication date
JPS5647755B2 (en) 1981-11-11

Similar Documents

Publication Publication Date Title
JPS5434709A (en) Call interruption system in facsimile communication
JPS53105306A (en) Detection system for calling
JPS5313806A (en) Telephone extension system
JPS5386102A (en) Selective exchange system
JPS53117922A (en) Absence reception voice answer skip system
JPS51128205A (en) Telephone device
JPS5439510A (en) Detection circuit for outgoing call
JPS5437609A (en) Extension call system
JPS5436106A (en) Service system of no response call back
JPS53129508A (en) Loop detection system for subscriber's line
JPS52125213A (en) Absence transfer system
JPS51115712A (en) Call detection method in automatic telephone exchange
JPS53100704A (en) Waiting-time connection system
JPS5382105A (en) System for numbering guide and dial service attendant board
JPS5390704A (en) Incoming response system
JPS54146508A (en) Cordless telephone system
JPS5397309A (en) Abbreviated dialing system
JPS5436108A (en) Malicious call detection system
JPS5437608A (en) Extension incoming automatic selection system
JPS5422705A (en) Extension subscriber calling system
JPS5399806A (en) Intra-office connection system
JPS51144504A (en) Telephone set
JPS5345907A (en) Scanning system of telephone subscriber
JPS5395510A (en) Scanning system for subscriber line
JPS5370701A (en) Individual selection call receiver