JP4447505B2 - 電話回線異常検出装置 - Google Patents
電話回線異常検出装置 Download PDFInfo
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- JP4447505B2 JP4447505B2 JP2005106319A JP2005106319A JP4447505B2 JP 4447505 B2 JP4447505 B2 JP 4447505B2 JP 2005106319 A JP2005106319 A JP 2005106319A JP 2005106319 A JP2005106319 A JP 2005106319A JP 4447505 B2 JP4447505 B2 JP 4447505B2
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- Japan
- Prior art keywords
- telephone line
- voltage
- capacitor
- resistor
- abnormality detection
- Prior art date
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Description
11:ダイオードブリッジ
12:電流制限抵抗
13:コンデンサ
14:放電電流制限抵抗
15:電圧監視部
16:フォトカップラ
16A:発光ダイオード
16B:フォトトランジスタ
17:トランジスタ
2:電話回線
3:警報装置
5:通報装置
51:管理会社・携帯電話機
61:警報ランプ
62:スピーカ
Claims (2)
- 電話回線に接続され、前記電話回線の異常を検出する電話回線異常検出装置であって、電話回線に直列に接続された第1の抵抗と、該第1の抵抗を介して電話回線の電圧により充電されるコンデンサと、前記コンデンサに並列に接続される第2の抵抗および、前記電話回線と絶縁の信号伝達手段と、前記コンデンサの電圧を監視する電圧監視部とを備え、前記電話回線からの電圧により、第1の抵抗を介して前記コンデンサを充電し、電圧監視部で前記コンデンサの充電電圧を監視し、充電電圧が所定の電圧以上に達したとき、前記信号伝達手段をオンし、前記コンデンサに充電された電力で、前記電話回線と絶縁した側にパルス信号を出力する手段を備え、パルス信号が得られない、もしくはパルス信号のパルス周期が所定の周期と異なる場合に、該電話回線は異常であると判定することを特徴とする電話回線異常検出装置。
- 請求項1記載の電話回線異常検出装置において、
前記第1の抵抗の抵抗値をR1、前記第2の抵抗の抵抗値をR2としたとき、R1≫R2としたことを特徴とする請求項1記載の電話回線異常検出装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005106319A JP4447505B2 (ja) | 2005-04-01 | 2005-04-01 | 電話回線異常検出装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005106319A JP4447505B2 (ja) | 2005-04-01 | 2005-04-01 | 電話回線異常検出装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2006287718A JP2006287718A (ja) | 2006-10-19 |
JP4447505B2 true JP4447505B2 (ja) | 2010-04-07 |
Family
ID=37409128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005106319A Expired - Fee Related JP4447505B2 (ja) | 2005-04-01 | 2005-04-01 | 電話回線異常検出装置 |
Country Status (1)
Country | Link |
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JP (1) | JP4447505B2 (ja) |
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2005
- 2005-04-01 JP JP2005106319A patent/JP4447505B2/ja not_active Expired - Fee Related
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Publication number | Publication date |
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JP2006287718A (ja) | 2006-10-19 |
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