JPS619954U - Subscriber line termination circuit - Google Patents
Subscriber line termination circuitInfo
- Publication number
- JPS619954U JPS619954U JP9291184U JP9291184U JPS619954U JP S619954 U JPS619954 U JP S619954U JP 9291184 U JP9291184 U JP 9291184U JP 9291184 U JP9291184 U JP 9291184U JP S619954 U JPS619954 U JP S619954U
- Authority
- JP
- Japan
- Prior art keywords
- subscriber line
- termination circuit
- line termination
- phototransistor
- photodiode
- 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
Landscapes
- Devices For Supply Of Signal Current (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
図は本考案の一実施例を示す回路図である。
１・・・・ざ・交換機、２・・・・・・加入者線、３・
・・・・・端末装置、４・・・・・・フォトトランジス
タ、５・・・・・・フォトダイオード、６・・・・・・
送受信回路、７・・・・・・加入者線線路抵抗、８・・
・・・・直流阻止用コンデンサ、９・・・・・・調整用
抵抗、１０・・・・・・電源。The figure is a circuit diagram showing an embodiment of the present invention. 1... The exchange, 2... Subscriber line, 3...
...Terminal device, 4...Phototransistor, 5...Photodiode, 6...
Transmission/reception circuit, 7...Subscriber line line resistance, 8...
...DC blocking capacitor, 9...Adjustment resistor, 10...Power supply.
Claims (1)
る加入者線の終端回路において、一つまたは従続接続さ
れたトランジスタ群のコレクタとエミツタ端子を加入者
線に接続し、かつ、該トランジスタ群の第１段目をフォ
トトランジスタとし、更に、フォトトランジスタと対向
してフォトダイオードを設け、該フォトダイオードに、
一定の電流を流すことにより、加入者線に一定の電流を
流させることを特徴とする加入者線終端回路。In a subscriber line termination circuit that propagates a signal by superimposing an alternating current signal on a direct current, the collector and emitter terminals of one or a group of cascade-connected transistors are connected to the subscriber line, and the transistor group The first stage is a phototransistor, and a photodiode is provided opposite to the phototransistor, and the photodiode has a
A subscriber line termination circuit characterized by causing a constant current to flow through the subscriber line by flowing a constant current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9291184U JPS619954U (en) | 1984-06-21 | 1984-06-21 | Subscriber line termination circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9291184U JPS619954U (en) | 1984-06-21 | 1984-06-21 | Subscriber line termination circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS619954U true JPS619954U (en) | 1986-01-21 |
Family
ID=30650127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9291184U Pending JPS619954U (en) | 1984-06-21 | 1984-06-21 | Subscriber line termination circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS619954U (en) |
-
1984
- 1984-06-21 JP JP9291184U patent/JPS619954U/en active Pending
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