JPS643356U - - Google Patents

Info

Publication number
JPS643356U
JPS643356U JP9728787U JP9728787U JPS643356U JP S643356 U JPS643356 U JP S643356U JP 9728787 U JP9728787 U JP 9728787U JP 9728787 U JP9728787 U JP 9728787U JP S643356 U JPS643356 U JP S643356U
Authority
JP
Japan
Prior art keywords
detection
dsc
photocoupler
control circuit
network control
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
JP9728787U
Other languages
Japanese (ja)
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 JP9728787U priority Critical patent/JPS643356U/ja
Publication of JPS643356U publication Critical patent/JPS643356U/ja
Pending legal-status Critical Current

Links

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本考案の一実施例を示す網制御回路の
要部、第2図は従来の同上回路の要部である。 1a,1b:加入者回線接続端子、5a,5b
:端末装置への接続端子、6:DSC検出用フオ
トカプラ、9:DSC検出出力端子、10:CI
検出用フオトカプラ、17:CI検出出力端子、
6′:DSC及びCI検出用フオトカプラ、20
:トランジスタ、21:DSC,CI検出出力端
子。
FIG. 1 shows a main part of a network control circuit showing an embodiment of the present invention, and FIG. 2 shows a main part of a conventional circuit. 1a, 1b: Subscriber line connection terminal, 5a, 5b
: Connection terminal to terminal device, 6: Photocoupler for DSC detection, 9: DSC detection output terminal, 10: CI
Detection photocoupler, 17: CI detection output terminal,
6': Photocoupler for DSC and CI detection, 20
: Transistor, 21: DSC, CI detection output terminal.

Claims (1)

【実用新案登録請求の範囲】 1 交換機の加入者線から加えられる着呼側の呼
出信号(以下CIと略す)と発呼側の接続完了信
号(以下DSCと略す)を検出する網制御回路(
以下NCU回路と略す)に於て、CI検出とDS
C検出を行う一つのフオトカプラーを設け、発呼
時のDSC検出時と着呼時のCI検出時とで、前
記フオトカプラの感度を切換えることを特徴とす
る網制御回路。 2 実用新案登録請求範囲第1項記載の前記フオ
トカプラはフオトトランジスタ側のコレクタ抵抗
の抵抗値を変化させる手段によりDSCとCIと
の検出感度の切換を行うことを特徴とする網制御
回路。
[Scope of Claim for Utility Model Registration] 1. A network control circuit (hereinafter abbreviated as CI) from the called side that is applied from the subscriber line of the exchange and a connection completion signal (hereinafter abbreviated as DSC) from the calling side.
(hereinafter abbreviated as NCU circuit), CI detection and DS
1. A network control circuit comprising: a photocoupler for C detection; the sensitivity of the photocoupler is switched between DSC detection at the time of a call and CI detection at the time of an incoming call; 2. A network control circuit characterized in that the photocoupler according to claim 1 of the Utility Model Registration switches detection sensitivity between DSC and CI by means of changing the resistance value of a collector resistor on the side of the phototransistor.
JP9728787U 1987-06-26 1987-06-26 Pending JPS643356U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9728787U JPS643356U (en) 1987-06-26 1987-06-26

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9728787U JPS643356U (en) 1987-06-26 1987-06-26

Publications (1)

Publication Number Publication Date
JPS643356U true JPS643356U (en) 1989-01-10

Family

ID=31322618

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9728787U Pending JPS643356U (en) 1987-06-26 1987-06-26

Country Status (1)

Country Link
JP (1) JPS643356U (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059855A (en) * 1983-09-12 1985-04-06 Nec Corp Circuit for detecting incoming signal and response of opposite device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059855A (en) * 1983-09-12 1985-04-06 Nec Corp Circuit for detecting incoming signal and response of opposite device

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