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
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 230000035945 sensitivity Effects 0.000 claims 2
Description
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)
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.
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)
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 |
-
1987
- 1987-06-26 JP JP9728787U patent/JPS643356U/ja active Pending
Patent Citations (1)
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 |