JPS57197956A - Interphone system - Google Patents

Interphone system

Info

Publication number
JPS57197956A
JPS57197956A JP8295281A JP8295281A JPS57197956A JP S57197956 A JPS57197956 A JP S57197956A JP 8295281 A JP8295281 A JP 8295281A JP 8295281 A JP8295281 A JP 8295281A JP S57197956 A JPS57197956 A JP S57197956A
Authority
JP
Japan
Prior art keywords
equipment
subordinate
master
entrance
circuit
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
JP8295281A
Other languages
Japanese (ja)
Inventor
Tomoyuki Inoue
Shigeki Shimomura
Shoji Kimura
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP8295281A priority Critical patent/JPS57197956A/en
Publication of JPS57197956A publication Critical patent/JPS57197956A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching

Abstract

PURPOSE:To automatically connect a master equipment to a subordinate equipment for the entrance on the ending of the talk between the master equipment and another subordinate equipment, by normally connecting the master equipment to the entrance subordinate equipment in a standby state. CONSTITUTION:In an initial state, a master equipment 1 and an entrance subordinate equipment 2 are connected through a circuit. When the handset is lifted up, a switch SW3 turns on to cut off the circuit between the master equipment 1 and entrance subordinate equipment 2, and the circuit between the master equipment 1 and a subordinate equipment 32 is formed preferentially. When the handset is returned, the circuit between the master equipment 1 and subordinate equipment 32 is cut off and the master equipment 1 and entrance subordinate equipment 2 are connected mutually. When a subordinate equipment 31 is switched selectively even when the master equipment 1 and subordinate equipment 32 are connected mutually, a relay RA is reset and the master equipment 1 and subordinate equipment 31 are placed in a ready state. When the handset is returned, the master equipment 1 and entrance subordinate equipment 2 are connected mutually.
JP8295281A 1981-05-30 1981-05-30 Interphone system Pending JPS57197956A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8295281A JPS57197956A (en) 1981-05-30 1981-05-30 Interphone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8295281A JPS57197956A (en) 1981-05-30 1981-05-30 Interphone system

Publications (1)

Publication Number Publication Date
JPS57197956A true JPS57197956A (en) 1982-12-04

Family

ID=13788552

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8295281A Pending JPS57197956A (en) 1981-05-30 1981-05-30 Interphone system

Country Status (1)

Country Link
JP (1) JPS57197956A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60203056A (en) * 1984-03-28 1985-10-14 Toshiba Electric Equip Corp Interphone device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60203056A (en) * 1984-03-28 1985-10-14 Toshiba Electric Equip Corp Interphone device
JPH0369471B2 (en) * 1984-03-28 1991-11-01 Toshiba Raitetsuku Kk

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