JPH01172790U - - Google Patents

Info

Publication number
JPH01172790U
JPH01172790U JP6942788U JP6942788U JPH01172790U JP H01172790 U JPH01172790 U JP H01172790U JP 6942788 U JP6942788 U JP 6942788U JP 6942788 U JP6942788 U JP 6942788U JP H01172790 U JPH01172790 U JP H01172790U
Authority
JP
Japan
Prior art keywords
hold
state
direct current
current connection
holding
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
JP6942788U
Other languages
English (en)
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 filed Critical
Priority to JP6942788U priority Critical patent/JPH01172790U/ja
Publication of JPH01172790U publication Critical patent/JPH01172790U/ja
Pending legal-status Critical Current

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Description

【図面の簡単な説明】
第１図は本考案の保留回路を使用する電話交換
システムのシステム構成図、第２図は本考案の実
施例として用いる主装置の回路構成図、第３図、
第４図は同上の保留動作説明用のタイムチヤート
、第５図は同上のフローチヤートである。 １５は保留音発生部、１７は直流閉結部、３１
は制御回路である。

Claims (1)

    【実用新案登録請求の範囲】
  1. 保留操作の検知後電話機がオンフツク状態にな
    つても回線の直流閉結を維持させる保留状態設定
    手段と、保留解除操作を検知すると保留状態を解
    除する解除手段とを備えるとともに、保留開始時
    から一定時間以上保留状態が継続すると、直流閉
    結を解除する手段を備えてなることを特徴とする
    保留回路。
JP6942788U 1988-05-26 1988-05-26 Pending JPH01172790U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6942788U JPH01172790U (ja) 1988-05-26 1988-05-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6942788U JPH01172790U (ja) 1988-05-26 1988-05-26

Publications (1)

Publication Number Publication Date
JPH01172790U true JPH01172790U (ja) 1989-12-07

Family

ID=31294704

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6942788U Pending JPH01172790U (ja) 1988-05-26 1988-05-26

Country Status (1)

Country Link
JP (1) JPH01172790U (ja)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4844563A (ja) * 1971-10-09 1973-06-26
JPS5184504A (ja) * 1975-01-21 1976-07-23 Iwatsu Electric Co Ltd
JPS53641A (en) * 1976-06-23 1978-01-06 Komatsu Mfg Co Ltd Shield excavator
JPS5394806A (en) * 1977-01-31 1978-08-19 Nec Corp Alarm display circuit for long-time holding of key telephone set
JPS62123856A (ja) * 1985-11-25 1987-06-05 Matsushita Electric Works Ltd 電話システム
JPS6384350A (ja) * 1986-09-29 1988-04-14 Toshiba Electric Equip Corp 電話用コンセント

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4844563A (ja) * 1971-10-09 1973-06-26
JPS5184504A (ja) * 1975-01-21 1976-07-23 Iwatsu Electric Co Ltd
JPS53641A (en) * 1976-06-23 1978-01-06 Komatsu Mfg Co Ltd Shield excavator
JPS5394806A (en) * 1977-01-31 1978-08-19 Nec Corp Alarm display circuit for long-time holding of key telephone set
JPS62123856A (ja) * 1985-11-25 1987-06-05 Matsushita Electric Works Ltd 電話システム
JPS6384350A (ja) * 1986-09-29 1988-04-14 Toshiba Electric Equip Corp 電話用コンセント

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