JPS6310859A - Detecting system for opposite response at call time - Google Patents

Detecting system for opposite response at call time

Info

Publication number
JPS6310859A
JPS6310859A JP15280386A JP15280386A JPS6310859A JP S6310859 A JPS6310859 A JP S6310859A JP 15280386 A JP15280386 A JP 15280386A JP 15280386 A JP15280386 A JP 15280386A JP S6310859 A JPS6310859 A JP S6310859A
Authority
JP
Japan
Prior art keywords
signal
opposite
network control
exchange
call
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
JP15280386A
Other languages
Japanese (ja)
Inventor
Kaneo Hamada
浜田 金男
Hiroshi Abe
浩 阿部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP15280386A priority Critical patent/JPS6310859A/en
Publication of JPS6310859A publication Critical patent/JPS6310859A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To enable an exchange which performs no polarity inversion to be connected to a network control unit, by providing a means which detects the disconnection of an opposite call tone sent out from the exchange corresponding to the call of its own device to the network control unit, and detecting the response of an opposite device by detecting the disconnection of the opposite call tone. CONSTITUTION:A call tone call circuit 8 on a caller side inputs the opposite call tone T1 on lines L1 and L2 as a signal T11 through a transformer T, and outputs a signal T2 to an NCU control part 9 corresponding to the opposite call tone. The NCU control part 9 monitors the signal T2, and by deciding that response from the opposite device is obtained if the next signal T2 is not supplied within a prescribed time after the signal T2 is truned off, the control part turns on a CML relay 7 through a relay driver 5. Therefore, contacts cm11 and cm12 are switched, and the lines L1 and L2 are connected to a modem, then a state progressing to a communication processing. Thus, since the response of the opposite device can be recognized by detecting the disconnection of the opposite call tone, it is possible to connect the network control unit to the exchange which performs no polarity inversion.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は交換機に接続される網制御装置における相手応
答検出方式に関し、特に着信相手の端末装置の応答時、
回線の極性反転を行わない交換機に接続される自動発信
・受信形網制御装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for detecting a response from a called party in a network control device connected to an exchange, and in particular, when a terminal device of a called party responds,
This invention relates to an automatic originating/receiving type network control device connected to an exchange that does not perform line polarity reversal.

(従来の技術) 第4図は相手応答待回線の極性反転を行う交換機に接続
される従来の自動発信・受信形網制御装置の一構成例を
示すブロック図である。同図において、1は網制御装置
制御部(以下、NCU制御部という)、2はトランスT
を介してラインL1L2にブツシュボタン信号を送出す
るブツシュボタン信号発生回路(以下、PB信号発生回
路という)、3は発呼待相手装置からの応答をラインL
工L2の極性反転を監視することにより検出する極性反
転検出回路、4は相手装置からの呼出しく16Hzの信
号)を検出する着信検出回路、5はダイヤルパルス発生
用リレー(以下、Dリレーという)6及びラインL1L
2を図示しないモデムに切替えるためのリレー(以下、
CMLリレーという)7をドライブするリレードライバ
である。dはDリレー6の接点を示し、c m l □
及びcm−12はCMLリレー7の接点を示す。また、
NCU制御部1は図示しない上位の主制御装置(例えば
、パーソナルコンピュータ)に接続されている。
(Prior Art) FIG. 4 is a block diagram showing an example of the configuration of a conventional automatic originating/receiving type network control device connected to an exchange that performs polarity reversal of a call waiting line. In the figure, 1 is a network control unit control unit (hereinafter referred to as an NCU control unit), and 2 is a transformer T.
A pushbutton signal generation circuit (hereinafter referred to as a PB signal generation circuit) sends a pushbutton signal to lines L1L2 via line L1, and 3 sends a response from the call waiting device to line L
A polarity reversal detection circuit detects the polarity reversal by monitoring the polarity reversal of the terminal L2, 4 is an incoming call detection circuit that detects a call (16Hz signal from the other device), and 5 is a dial pulse generation relay (hereinafter referred to as D relay). 6 and line L1L
2 to a modem (not shown) (hereinafter referred to as
This is a relay driver that drives the CML relay (CML relay) 7. d indicates the contact point of D relay 6, cm l □
and cm-12 indicate the contact point of the CML relay 7. Also,
The NCU control unit 1 is connected to a higher-level main control device (for example, a personal computer), which is not shown.

次に、上記回路において、PB倍信号自動発信を行う動
作を、第5図の動作フローチャートを参照して説明する
Next, the operation of automatically transmitting the PB double signal in the above circuit will be explained with reference to the operation flowchart of FIG.

まず、発呼指示を上位の主制御装置より受けると、NC
U制御部1はDリレー6をオンにし、d接点を閉じる(
ステップ100)。このd接点が閉じたことにより、ラ
インL1L、は直流的に閉ループ状態となり1図示しな
い交換機はダイヤルパルス信号を受けつけられる状態と
なる。次に、主制御装置よりダイヤル番号データがNC
U制御部1へ送出されてくると、NCU制御部1はPB
信号発生回路2へ順次ブツシュボタンデータを送出する
(ステップ101)。PB信号発生回路2はブツシュボ
タンデータが送られてきた順に、ブツシュボタン信号を
トランスTを介してラインL、L2へ送出する。ライン
L1L2に接続されている交換機は、網制御装置からラ
インL、 L、を介して送出されたブツシュボタン信号
に従って、相手装置を呼出す。
First, when a call instruction is received from the upper main controller, the NC
The U control unit 1 turns on the D relay 6 and closes the d contact (
Step 100). With this d contact closed, the line L1L becomes in a DC closed loop state, and the exchanger (not shown) becomes ready to receive dial pulse signals. Next, the dial number data is sent to the NC from the main controller.
When the data is sent to the U control unit 1, the NCU control unit 1 outputs the PB
Push button data is sequentially sent to the signal generation circuit 2 (step 101). The PB signal generating circuit 2 sends out the button signals to the lines L and L2 via the transformer T in the order in which the button data is sent. The exchange connected to lines L1 and L2 calls the other party's device in accordance with the pushbutton signal sent from the network control device via lines L and L.

呼出し信号を受けた相手装置は、自装置内のNCUによ
り応答を自装置のラインL、 L、を閉じることによっ
て交換機に通知する。この通知を受けた交換機は発信側
のラインL1L、の極性を反転させることにより、相手
装置から応答があったことを発呼側に知らせる。ここで
、極性反転とはラインL2が地気(Ov)でラインLユ
が一48Vの状態から。
Upon receiving the call signal, the other party's device notifies the exchange of the response by using its own NCU to close lines L, L of its own device. Upon receiving this notification, the exchange inverts the polarity of line L1L on the calling side to notify the calling side that there has been a response from the other party's device. Here, polarity reversal means that the line L2 is on the ground (Ov) and the line L is on -48V.

ラインL1が地気でラインL2が一48Vの状態になる
ことである。発呼側の極性反転検出回路3はラインLi
L、の極性を監視しており(ステップ102)、前記極
性反転を検出するとNCU制御部1に通知する。この通
知を受けたNCU制御部1は自装置が相手装置に接続さ
れた(相手装置が応答した)ことを知り、リレードライ
バ5を介してCMLリレー7をオンにする(ステップ1
03)。これにより、接点cml、及びc m l□が
切替わり、ラインL1L2をモデムに接続し、通信が開
始される。
Line L1 is at ground level and line L2 is at -48V. The polarity reversal detection circuit 3 on the calling side is connected to the line Li.
The polarity of L is monitored (step 102), and when the polarity reversal is detected, the NCU control unit 1 is notified. Upon receiving this notification, the NCU control unit 1 learns that its own device is connected to the other device (the other device has responded), and turns on the CML relay 7 via the relay driver 5 (step 1
03). As a result, the contacts cml and cml□ are switched to connect lines L1L2 to the modem, and communication is started.

(発明が解決しようとする問題点) しかしながら、上記従来の網制御装置は相手装置の応答
をラインの極性反転を検出することにより知る方式であ
るため、網制御装置が極性反転を行すない交換機(例え
ば構内交換機)に接続されている場合には、網制御装置
からの発呼に対し相手装置が応答しても発呼側の網制御
装置は相手装置の着信を知ることができないという問題
点がある。
(Problems to be Solved by the Invention) However, since the conventional network control device described above uses a method of knowing the response of the partner device by detecting the polarity reversal of the line, the network control device does not perform polarity reversal. (for example, a private branch exchange), the problem is that even if the other device responds to a call from the network control device, the network control device on the calling side cannot know that the other device has received a call. There is.

従って、本発明は上記問題点を解決し、極性反転を行う
交換機は勿論、極性反転を行わない交換機にも適応可能
な汎用性に優れた網制御装置の相手応答検出方式を提供
することを目的とする。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide a highly versatile network control device response detection method that can be applied not only to exchanges that perform polarity reversal but also to exchanges that do not perform polarity reversal. shall be.

(問題点を解決するための手段) 本発明は、交換機に接続される網制御装置を対象とする
(Means for Solving the Problems) The present invention is directed to a network control device connected to an exchange.

本発明は、網制御装置内に、当該網制御装置からの発呼
に対応して交換機から送出される相手呼出音の断を検出
する手段を設ける。そして、この手段が相手呼出音の断
を検出することにより、IR制御装置は相手装置が応答
したことを検出する。
According to the present invention, a network control device is provided with means for detecting disconnection of a ringing tone sent from a switch in response to a call originating from the network control device. When this means detects the disconnection of the other party's ringing tone, the IR control device detects that the other party's device has responded.

(作用) 発呼時、網制御装置はラインを直流的に閉ループ状態と
し、ダイヤルパルスをラインに送出する。
(Operation) When making a call, the network control device puts the line into a DC closed loop state and sends a dial pulse to the line.

交換機はラインを介してダイヤルパルスを受信し、相手
装置を呼出すためのベル信号を送出するとともに、発呼
側の上記網制御装置に相手呼出音を送出する。網制御装
置内の上記手段はこの相手呼出音を受信し、相手呼出音
が断となったことを検出する(通常、相手呼出音は所定
デユーティ比のパルスであり、上記手段は所定時間内に
このパルスが受信されなかったとき、相手呼出音が断と
なったことを検出する)、この相手呼出音は相手装置が
応答した場合に断となるので、これを検出することによ
り網制御装置は相手装置の応答を知ることができる。
The exchange receives the dial pulse via the line, sends out a bell signal for calling the called party's device, and also sends out a calling tone to the network control device on the calling side. The means in the network control device receives this ringing tone of the other party, and detects that the ringing tone of the other party has been cut off (normally, the ringing tone of the other party is a pulse with a predetermined duty ratio, (When this pulse is not received, it is detected that the other party's ring tone has been disconnected.) Since this other party's ring tone is disconnected when the other party's device answers, by detecting this, the network control device You can know the response of the other device.

(実施例) 以下、本発明の実施例を図面を参照して詳細に説明する
(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

第1図は5本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.

尚1図中、第4図中の構成要素と同一のものには同一の
参照番号を付しである1本実施例は第4図に示す構成に
対し、次の点で異なる。すなわち、本実施例は第4図中
の極性反転検出回路3に代えて、FB信号発生回路2の
出力とトランスTの2次側の接続点とNCU制御部9の
間に呼出音検出回路8を設けたことと、NCU制御部9
に呼出音検出回路8の出力信号を監視する機能を設けた
ことにある。呼出音検出回路8は、ラインLiL、を介
して交換機から送られてくる相手呼出音(call b
ack tone)をトランスTを介して受取り、波形
成形してNCU制御部8に通知するものである。
Components in FIG. 1 that are the same as those in FIG. 4 are given the same reference numerals.This embodiment differs from the configuration shown in FIG. 4 in the following points. That is, in this embodiment, instead of the polarity reversal detection circuit 3 in FIG. and NCU control unit 9.
This is because a function for monitoring the output signal of the ringing tone detection circuit 8 is provided. The ring detection circuit 8 detects the ring tone of the other party (call b) sent from the exchange via the line LiL.
ack tone) via the transformer T, shapes the waveform, and reports it to the NCU control unit 8.

次に、本実施例の動作をブツシュボタン信号で自動発信
を行う場合を例に挙げ、第2図に示す動作フローチャー
トを参照して説明する。
Next, the operation of this embodiment will be explained by taking as an example the case where automatic transmission is performed using a button signal, with reference to the operation flowchart shown in FIG.

まず、発呼指示を上位の主制御装置より受けると、NC
U制御部9はDリレー6をオンにし、d接点を閉じる(
ステップ200)、このd接点が閉じたことにより、ラ
インLIL2は直流的に閉ループ状態となり、図示しな
い交換機はダイヤルパルス信号を受は付けられる状態と
なる0次に、主制御装置よりダイヤル番号データがNC
U制御部9へ送出されてくると、NCU制御部9はPB
信号発生回路2へ順次ブツシュボタンデータを送出する
(ステップ201)、PB信号発生回路2はブツシュボ
タンデータが送られてきた順に、ブツシュボタン信号を
トランスTを介してラインL、 L、へ送出する。ライ
ンL、 L2に接続されている交換機は、網制御装置か
らラインLiL、を介して送出されたブツシュボタン信
号に従って、相手装置を呼出す。
First, when a call instruction is received from the upper main controller, the NC
The U control unit 9 turns on the D relay 6 and closes the d contact (
Step 200), by closing this d contact, the line LIL2 enters a DC closed loop state, and the exchange (not shown) is in a state where it can receive dial pulse signals.Next, the dial number data is received from the main controller. N.C.
When it is sent to the U control unit 9, the NCU control unit 9
Sequentially sends the button data to the signal generating circuit 2 (step 201).The PB signal generating circuit 2 sends the button signals to the lines L, L, Send to. The exchange connected to lines L and L2 calls the other party's device in accordance with the pushbutton signal sent from the network control device via line LiL.

ここで、呼出し中は、交換機は着信側相手装置に対しベ
ル信号(16Hz)を送出するとともに、発呼側装置に
対しても相手呼出音(400Hz)を送出する。
During a call, the exchange sends a bell signal (16 Hz) to the called party's device and also sends a ring tone (400 Hz) to the calling party's device.

発呼側の呼出音呼出回路8は、ラインL工L2上の相手
呼出音T工をトランスTを介して信号T工、として入力
しくステップ202)、相手呼出音に対応してNCU制
御部9に信号T1を出力する。NCU制御部9は、信号
T2を監視し、信号T2がオフになってから所定時間内
に次の信号T2が供給されない場合に相手装置が応答し
たとして、リレードライバ5を介してCMLリレー7を
オンにする(ステップ203)、これにより、接点c 
m lユ及びCm1.が切替わり、ラインL、L、とモ
デムとが接続され、通信処理に移る。
The ringing circuit 8 on the calling side inputs the other party's ringing tone T on the line L2 as a signal T via the transformer T (step 202), and outputs the NCU control unit 9 in response to the other party's ringing tone. The signal T1 is output to. The NCU control unit 9 monitors the signal T2, and if the next signal T2 is not supplied within a predetermined time after the signal T2 is turned off, the NCU control unit 9 determines that the other device has responded and activates the CML relay 7 via the relay driver 5. on (step 203), which causes contact c
m l yu and Cm1. is switched, lines L and L are connected to the modem, and communication processing begins.

このように1本実施例によれば、ラインの極性反転を検
出する代わりに、相手呼出音の断を検出することにより
相手装置の応答を知ることができる。従って、本実施例
によれば、極性反転を行わない交換機に網制御装置を接
続することができる。
As described above, according to this embodiment, the response of the other party's device can be known by detecting the disconnection of the other party's ringing tone instead of detecting the polarity reversal of the line. Therefore, according to this embodiment, the network control device can be connected to an exchange that does not perform polarity reversal.

勿論、極性反転を行う交換機にもそのまま接続できる。Of course, it can also be directly connected to an exchange that performs polarity reversal.

次に、第1図中の呼出音検出回路8の詳細な回路構成を
、第3図を参照して説明する。ここで。
Next, the detailed circuit configuration of the ringing tone detection circuit 8 in FIG. 1 will be explained with reference to FIG. 3. here.

第3図(a)は呼出音検出回路8の回路図、同図(b)
はこの回路の動作タイムチャートである。
FIG. 3(a) is a circuit diagram of the ringing tone detection circuit 8, and FIG. 3(b) is a circuit diagram of the ringing tone detection circuit 8.
is an operation time chart of this circuit.

同図(a)において、比較器10の非反転入力端子はト
ランスTの2次側に接続され、反転入力端子には抵抗R
□を介してOv(基準電圧)が供給される。比較器10
の出力端子は、ワンショット回路11の入力端子に接続
されている。ワンショット回路11は比較器10の出力
信号Ti、でトリガされ、抵抗RとコンデンサCどの時
定数で決まるパルス幅のパルスT2をNCU制御部9に
出力する。尚、比較器10の出力端子には抵抗R2を介
して電圧+5Vが供給される。
In the same figure (a), the non-inverting input terminal of the comparator 10 is connected to the secondary side of the transformer T, and the inverting input terminal is connected to the resistor R.
Ov (reference voltage) is supplied via □. Comparator 10
The output terminal of is connected to the input terminal of the one-shot circuit 11. The one-shot circuit 11 is triggered by the output signal Ti of the comparator 10, and outputs a pulse T2 having a pulse width determined by the time constant of the resistor R and the capacitor C to the NCU controller 9. Note that a voltage of +5V is supplied to the output terminal of the comparator 10 via a resistor R2.

次に、この回路の動作を説明する。Next, the operation of this circuit will be explained.

ラインL1L、上の相手呼出音T1は400Hzの信号
で、2秒ON、1秒OFFの周期で送出されている。こ
の相手呼出音T工は、トランスTの2次側に第3図(a
)の信号T。とじて現われる。信号T1□は比較器10
でOvの基準電圧と比較され、比較結果が第3図(b)
の信号T1□として出力される。
The other party's ring tone T1 on the line L1L is a 400 Hz signal, which is transmitted at a cycle of 2 seconds on and 1 second off. This ringing tone T is installed on the secondary side of the transformer T as shown in Fig. 3 (a).
) signal T. It closes and appears. Signal T1□ is the comparator 10
The comparison result is shown in Figure 3(b).
is output as a signal T1□.

この信号T1□はワンショット回路11に入力され。This signal T1□ is input to the one-shot circuit 11.

抵抗RとコンデンサCで決まる時定数により約2秒ON
、1秒OFFの矩形波の信号’ri(第3図(C))に
整形され、NCU制御部9に送出される。
ON for about 2 seconds depending on the time constant determined by resistor R and capacitor C
, is shaped into a rectangular wave signal 'ri (FIG. 3(C)) that is off for 1 second, and is sent to the NCU control unit 9.

NCU制御部9は2秒ON、1秒OFFの信号T2を監
視し、信号T2のパルスの後縁から所定時間ΔS内に信
号T2が入力されないときは着信有りと判定し、相手装
置からの応答を検出したとして着信通知信号りをハイレ
ベルにして、主制御装置に通知する。
The NCU control unit 9 monitors the signal T2, which is ON for 2 seconds and OFF for 1 second, and if the signal T2 is not input within a predetermined time ΔS from the trailing edge of the pulse of the signal T2, it determines that there is an incoming call, and responds from the other party's device. Detected, the incoming call notification signal is set to high level and the main controller is notified.

尚、相手装置が他の装置と通信中の場合は、交換機から
発呼側装置に400Hzのビジートーンが送られてくる
が、このビジートーンは連続信号なので、これにより本
回路が誤って相手応答を検出してしまうということはな
い。
Note that when the other party's device is communicating with another device, a 400Hz busy tone is sent from the exchange to the calling device, but since this busy tone is a continuous signal, this circuit may erroneously detect the other party's response. There's no way you'll end up doing it.

(発明の効果) 以上説明したように1本発明によれば、網制御装置に自
装置からの発呼に対応して交換機から送出される相手呼
出音の断を検出する手段を設け、相手呼出音の断を検出
することによって相手装置が応答したことを検出するこ
ととしたため、以下の効果が得られる。
(Effects of the Invention) As explained above, according to one aspect of the present invention, a network control device is provided with a means for detecting disconnection of the other party's ringing tone transmitted from the exchange in response to a call originating from the own device, and Since the response of the other party's device is detected by detecting the interruption of sound, the following effects can be obtained.

(イ)極性反転を行う交換機は勿論、極性反転を行すな
い交換機にも網制御装置を接続することができる。従っ
て、m制御装置が接続可能なラインの汎用性が向上する
(a) The network control device can be connected not only to exchanges that perform polarity reversal but also to exchanges that do not perform polarity reversal. Therefore, the versatility of the line to which the m control device can be connected is improved.

(ロ)ラインの極性を問題にしていないので、網制御装
置の設置時にラインの極性を調べる必要がなく、作業が
簡単になる。
(b) Since the polarity of the line is not an issue, there is no need to check the polarity of the line when installing the network control device, which simplifies the work.

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

第1図は本発明の一実施例を示すブロック図、第2図は
本実施例の発呼時の動作フローチャート、第3図(a)
は本実施例中の呼出音検出回路の回路図、第3図(b)
は第3図(a)の回路の動作タイミング図、第4図は従
来の網制御装置を示すブロック図、及び第5図は第4図
の従来の網制御装置の発呼時の動作フローチャートであ
る。 1.9・・・NCU制御部、 2・・・PB信号発生回路、 3・・・極性反転検出回路、 4・・・看信検出回路、 5・・・リレードライバ、 6・・・ダイヤルパルス発生用(D)リレー、7・・・
CMLリレー、 8・・・呼出音検出回路。 10・・・比較器、 11・・・ワンショット回路6
Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an operational flowchart when making a call in this embodiment, and Fig. 3 (a).
is a circuit diagram of the ringing tone detection circuit in this embodiment, FIG. 3(b)
is an operation timing diagram of the circuit shown in FIG. 3(a), FIG. 4 is a block diagram showing a conventional network control device, and FIG. 5 is an operation flowchart of the conventional network control device shown in FIG. be. 1.9...NCU control unit, 2...PB signal generation circuit, 3...Polarity reversal detection circuit, 4...Nursing detection circuit, 5...Relay driver, 6...Dial pulse Generation (D) relay, 7...
CML relay, 8...ringing detection circuit. 10...Comparator, 11...One-shot circuit 6

Claims (1)

【特許請求の範囲】 交換機に接続される網制御装置において、 網制御装置内に当該網制御装置からの発呼に対応して交
換機から送出される相手呼出音の断を検出する手段を設
け、 該手段が相手呼出音の断を検出することにより、網制御
装置は相手装置が応答したことを検出することを特徴と
する発呼時の相手応答検出方式。
[Scope of Claims] A network control device connected to an exchange, comprising means for detecting disconnection of a calling tone transmitted from the exchange in response to a call originating from the network control device; 1. A method for detecting a response at the time of a call, wherein the means detects a disconnection of the other party's ringing tone, thereby causing the network control device to detect that the other party's device has responded.
JP15280386A 1986-07-01 1986-07-01 Detecting system for opposite response at call time Pending JPS6310859A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15280386A JPS6310859A (en) 1986-07-01 1986-07-01 Detecting system for opposite response at call time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15280386A JPS6310859A (en) 1986-07-01 1986-07-01 Detecting system for opposite response at call time

Publications (1)

Publication Number Publication Date
JPS6310859A true JPS6310859A (en) 1988-01-18

Family

ID=15548496

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15280386A Pending JPS6310859A (en) 1986-07-01 1986-07-01 Detecting system for opposite response at call time

Country Status (1)

Country Link
JP (1) JPS6310859A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02265351A (en) * 1989-04-05 1990-10-30 Yamato Protec Co Incoming state discrimination method for communication line
JPH03113558U (en) * 1990-03-05 1991-11-20

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6115453A (en) * 1984-06-29 1986-01-23 Fujitsu Denso Ltd Circuit system detecting response of called party

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6115453A (en) * 1984-06-29 1986-01-23 Fujitsu Denso Ltd Circuit system detecting response of called party

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02265351A (en) * 1989-04-05 1990-10-30 Yamato Protec Co Incoming state discrimination method for communication line
JPH03113558U (en) * 1990-03-05 1991-11-20

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