JPS52115106A - Telephone state detection system - Google Patents

Telephone state detection system

Info

Publication number
JPS52115106A
JPS52115106A JP3088676A JP3088676A JPS52115106A JP S52115106 A JPS52115106 A JP S52115106A JP 3088676 A JP3088676 A JP 3088676A JP 3088676 A JP3088676 A JP 3088676A JP S52115106 A JPS52115106 A JP S52115106A
Authority
JP
Japan
Prior art keywords
detection system
state detection
telephone state
telephone
telephone line
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
JP3088676A
Other languages
English (en)
Japanese (ja)
Other versions
JPS555944B2 (mo
Inventor
Shinichi Shibata
Yoshiichi Sano
Taiji Sato
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP3088676A priority Critical patent/JPS52115106A/ja
Publication of JPS52115106A publication Critical patent/JPS52115106A/ja
Publication of JPS555944B2 publication Critical patent/JPS555944B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
JP3088676A 1976-03-23 1976-03-23 Telephone state detection system Granted JPS52115106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3088676A JPS52115106A (en) 1976-03-23 1976-03-23 Telephone state detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3088676A JPS52115106A (en) 1976-03-23 1976-03-23 Telephone state detection system

Publications (2)

Publication Number Publication Date
JPS52115106A true JPS52115106A (en) 1977-09-27
JPS555944B2 JPS555944B2 (mo) 1980-02-12

Family

ID=12316201

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3088676A Granted JPS52115106A (en) 1976-03-23 1976-03-23 Telephone state detection system

Country Status (1)

Country Link
JP (1) JPS52115106A (mo)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55109095A (en) * 1979-02-14 1980-08-21 Nec Corp Call signal detection system
JPS5731256A (en) * 1980-08-01 1982-02-19 Oki Electric Ind Co Ltd Ncu circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50100903A (mo) * 1973-12-28 1975-08-11

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50100903A (mo) * 1973-12-28 1975-08-11

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55109095A (en) * 1979-02-14 1980-08-21 Nec Corp Call signal detection system
JPS5731256A (en) * 1980-08-01 1982-02-19 Oki Electric Ind Co Ltd Ncu circuit

Also Published As

Publication number Publication date
JPS555944B2 (mo) 1980-02-12

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