JPS647458U - - Google Patents
Info
- Publication number
- JPS647458U JPS647458U JP10171087U JP10171087U JPS647458U JP S647458 U JPS647458 U JP S647458U JP 10171087 U JP10171087 U JP 10171087U JP 10171087 U JP10171087 U JP 10171087U JP S647458 U JPS647458 U JP S647458U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- logic
- calling
- signal
- signals
- 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.)
- Granted
Links
Landscapes
- Facsimile Transmission Control (AREA)
Description
第１図は本考案の実施例を示す網制御回路の回
路図、第２図は従来の網制御回路の回路図、第３
図は第１図の信号波形図である。
２０……電話回線端子、２１……電話機端子、
２２……接点、２３……装置、２４―１，２４―
２……ペア形フオトカプラ、２７―１，２７―２
……ＡＮＤゲート、２８……ＯＲゲート、２９…
…ワンシヨツト回路、３０，３１―１，３１―２
……出力端子、Ｓｉ……呼出交流信号。
Figure 1 is a circuit diagram of a network control circuit showing an embodiment of the present invention, Figure 2 is a circuit diagram of a conventional network control circuit, and Figure 3 is a circuit diagram of a conventional network control circuit.
The figure is a signal waveform diagram of FIG. 1. 20...Telephone line terminal, 21...Telephone terminal,
22... Contact, 23... Device, 24-1, 24-
2...Pair type photocoupler, 27-1, 27-2
...AND gate, 28...OR gate, 29...
...One shot circuit, 30, 31-1, 31-2
... Output terminal, Si ... Calling AC signal.
Claims (1)
線の直流ループ電流及び呼出交流信号に応じた２
つの論理信号を出力する検出回路と、 前記２つの論理和信号の論理和をとる論理回路
と、 前記呼出交流信号の周期よりも長い時定数を有
し前記論理回路の出力でトリガされるワンシヨツ
ト回路とを、 備えたことを特徴とする網制御回路。[Scope of claim for utility model registration] 2. In devices such as facsimile machines and data terminals, which respond to the direct current loop current of the line and the calling alternating current signal.
a detection circuit that outputs two logic signals, a logic circuit that takes the logical sum of the two logic sum signals, and a one-shot circuit that has a time constant longer than the period of the calling AC signal and is triggered by the output of the logic circuit. A network control circuit comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987101710U JPH0638523Y2 (en) | 1987-07-01 | 1987-07-01 | Network control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987101710U JPH0638523Y2 (en) | 1987-07-01 | 1987-07-01 | Network control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS647458U true JPS647458U (en) | 1989-01-17 |
| JPH0638523Y2 JPH0638523Y2 (en) | 1994-10-05 |
Family
ID=31330954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987101710U Expired - Lifetime JPH0638523Y2 (en) | 1987-07-01 | 1987-07-01 | Network control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638523Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57112196A (en) * | 1980-12-29 | 1982-07-13 | Fujitsu Ltd | Ringing detection circuit |
| JPS58219863A (en) * | 1982-06-14 | 1983-12-21 | Ricoh Co Ltd | Detecting device of calling signal |
-
1987
- 1987-07-01 JP JP1987101710U patent/JPH0638523Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57112196A (en) * | 1980-12-29 | 1982-07-13 | Fujitsu Ltd | Ringing detection circuit |
| JPS58219863A (en) * | 1982-06-14 | 1983-12-21 | Ricoh Co Ltd | Detecting device of calling signal |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0638523Y2 (en) | 1994-10-05 |
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