JPS5650657A - Key telephone system - Google Patents

Key telephone system

Info

Publication number
JPS5650657A
JPS5650657A JP17288579A JP17288579A JPS5650657A JP S5650657 A JPS5650657 A JP S5650657A JP 17288579 A JP17288579 A JP 17288579A JP 17288579 A JP17288579 A JP 17288579A JP S5650657 A JPS5650657 A JP S5650657A
Authority
JP
Japan
Prior art keywords
hook
trunk line
extension
relay
released
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
JP17288579A
Other languages
Japanese (ja)
Inventor
Katsuyuki Sekine
Tomio Nishimura
Yoshio Shinoda
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.)
Tamura Electric Works Ltd
Original Assignee
Tamura 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 Tamura Electric Works Ltd filed Critical Tamura Electric Works Ltd
Priority to JP17288579A priority Critical patent/JPS5650657A/en
Publication of JPS5650657A publication Critical patent/JPS5650657A/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
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To realize a compact and light-weight structure of a telephone set, by connecting the latching relay in series to the extension channel and thus securing a release for the latching relay by the extension call current. CONSTITUTION:The trunk line relay A is kept under the working state during the make of power supply and by the turn-on of the transistor TR1, and then turned off with the off-hook to be held by the TR2. Then an extension channel is formed via the loop of the latching relay RL2 and the TEL. IN this instant, if the RL2 is working, it is released by the extension call current. After this, the extension call is possible between the both TELs with off-hook of another TEL. On the other hand, the trunk line button LK is operated after the off-hook and while the trunk line is busy, the relay A is released. As a result, the RL2 works to form the trunk line channel, and the RL2 continues its working after the end of call to be released by the extension call current during the next off-hook.
JP17288579A 1979-12-28 1979-12-28 Key telephone system Pending JPS5650657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17288579A JPS5650657A (en) 1979-12-28 1979-12-28 Key telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17288579A JPS5650657A (en) 1979-12-28 1979-12-28 Key telephone system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP12616879A Division JPS5650656A (en) 1979-09-29 1979-09-29 Key telephone system

Publications (1)

Publication Number Publication Date
JPS5650657A true JPS5650657A (en) 1981-05-07

Family

ID=15950118

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17288579A Pending JPS5650657A (en) 1979-12-28 1979-12-28 Key telephone system

Country Status (1)

Country Link
JP (1) JPS5650657A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6061162A (en) * 1983-09-12 1985-04-08 Matsushita Electric Ind Co Ltd Casting method of grid body for lead storage battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6061162A (en) * 1983-09-12 1985-04-08 Matsushita Electric Ind Co Ltd Casting method of grid body for lead storage battery

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