JPS63149957A - Network connection control unit - Google Patents

Network connection control unit

Info

Publication number
JPS63149957A
JPS63149957A JP29654086A JP29654086A JPS63149957A JP S63149957 A JPS63149957 A JP S63149957A JP 29654086 A JP29654086 A JP 29654086A JP 29654086 A JP29654086 A JP 29654086A JP S63149957 A JPS63149957 A JP S63149957A
Authority
JP
Japan
Prior art keywords
polarity
voltage
line
circuit
detection circuit
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
Application number
JP29654086A
Other languages
Japanese (ja)
Other versions
JPH0754952B2 (en
Inventor
Hachiro Iida
飯田 八郎
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP61296540A priority Critical patent/JPH0754952B2/en
Publication of JPS63149957A publication Critical patent/JPS63149957A/en
Publication of JPH0754952B2 publication Critical patent/JPH0754952B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To normally operate a terminal equipment by operating a polarity coincidence circuit when the polarity detected by a polarity detection circuit differs from the polarity of the voltage applied to a terminal equipment in a network connection control unit and connecting the line with the terminal equipment. CONSTITUTION:When an incoming detection circuit 16 detects no incoming call and telephone sets 5, 6 and an automatic facsimile equipment 7 acquire no extension (in an idle state), a control circuit 200 uses a polarity detection circuit 17 to detect the polarity of the voltage of the line 1, and if the polarity is different from the polarity of the voltage (-EV) of the power supply 16 supplying a loop current to the extensions 2-4, the polarity of the voltage of the line 1 is inverted beforehand by a relay switch SW8 to make the polarity coincident with each other. Thus, in outgoing/incoming call state, even when the terminal equipment of a non-telephone system such as the automatic facsimile equipment 7 is connected to the extension 4, the same operation as the polarity change in the voltage of the telephone network is obtained and the connected terminal equipment is operated stably without a malfunction.

Description

【発明の詳細な説明】 〔産業上の利用分野) この発明は、電話網の回線を複数の内線に分岐交換し、
その内線に非電話系の端末が接続される網接続制御装置
に関するものである。
[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a system for branching and exchanging lines of a telephone network into a plurality of extension lines,
This invention relates to a network connection control device to which a non-telephone terminal is connected to the extension.

〔従来の技術〕[Conventional technology]

第3図は電話網の回線数が1.内線数が3の従来の網接
続制御装置の構成例の概略を示す図である。この図にお
いて、1は回線、2〜4は内線、5.6は電話機、7は
自動ファクシミリ、8はループ作成回路、9,10.1
1はループ監視回路、12は保護回路、13はリング発
生器、14.15は電源で、それぞれの電圧は+EV、
−EVとなっている。SWIはリング発生器切替用のリ
レースイッチ、SW2〜SW4は内線切替用のリレース
イッチ、100は制御回路である。
Figure 3 shows that the number of lines in the telephone network is 1. 1 is a diagram schematically showing a configuration example of a conventional network connection control device with three extensions; FIG. In this figure, 1 is a line, 2 to 4 are extensions, 5.6 is a telephone, 7 is an automatic facsimile, 8 is a loop creation circuit, 9, 10.1
1 is a loop monitoring circuit, 12 is a protection circuit, 13 is a ring generator, 14.15 is a power supply, each voltage is +EV,
-EV. SWI is a relay switch for ring generator switching, SW2 to SW4 are relay switches for extension switching, and 100 is a control circuit.

次に動作について説明する。Next, the operation will be explained.

着信時にあらかじめ選択されている電話機5に一旦着信
し、電話機5が回線捕捉(ループオン)後、制御回路1
00が電話機5のダイヤルパルスを検出することにより
、転送する内線の番号を検出し、リレースイッチSW2
.SWIを切替え、かつループ作成回路8により電話網
の回線を捕捉した状態で、指定された内線にリング発生
器13で発生されたベル鳴動のためのリング信号を送出
して内線の転送ができる構成になっている。
Once the call arrives at the telephone 5 selected in advance at the time of incoming call, after the telephone 5 seizes the line (loop on), the control circuit 1
00 detects the dial pulse of telephone 5, detects the extension number to be transferred, and switches relay switch SW2.
.. A configuration in which a ring signal for ringing a bell generated by a ring generator 13 is sent to a designated extension to transfer the extension when the SWI is switched and the line of the telephone network is captured by the loop creation circuit 8. It has become.

また、発信時においては、制御回路100が自動ファク
シミリ7がループオンした時に、リレースイッチSW4
をオンし、リレースイッチSW2をオフすることにより
電話網に接続された回線1にダイヤルパルスまたはPB
を送出できる構成となっている。
Further, when making a call, the control circuit 100 switches the relay switch SW4 when the automatic facsimile machine 7 is looped on.
By turning on relay switch SW2 and turning off relay switch SW2, a dial pulse or PB is sent to line 1 connected to the telephone network.
It is configured to be able to send out.

そして、自動ファクシミリ7の発信時、相手応答を確認
するためには、電話網の回線1を監視し、極性の反転を
もって相手応答を検出する方法が一般的に用いられてい
る。
In order to check the response of the other party when making an automatic facsimile 7, a method is generally used in which the line 1 of the telephone network is monitored and the response of the other party is detected by reversing the polarity.

(発明が解決しようとする問題点) しかし、このような検出方法では、自動ファクシミリ7
の通常状態の電圧の極性と電話網の回線1から送出され
る電圧の極性とが一致していない時の発信時には、回線
1を捕捉しただけで極性が反転するため、自動ファクシ
ミリ7からのダイヤルパルスの送出後の相手応答時に再
び極性が反転してもこの相手応答を正常に検出できない
場合がある。
(Problem to be solved by the invention) However, with this detection method, automatic facsimile 7
When making a call when the polarity of the voltage in the normal state and the polarity of the voltage sent out from line 1 of the telephone network do not match, the polarity will be reversed just by capturing line 1, so the dialing from automatic facsimile 7 Even if the polarity is reversed again when the other party responds after sending a pulse, this other party's response may not be detected normally.

このような不具合を解消するためには、回線1の極性と
、第3図の網接続制御装置内部の電源15の電圧(−E
V)とを一致させるように設置工事時に回線1と接続す
る必要があった。
In order to eliminate such problems, it is necessary to change the polarity of the line 1 and the voltage (-E
It was necessary to connect it to line 1 during the installation work so that it matched V).

また、自動ファクシミリによっては接続される回線の電
圧の極性を定義しているものがあり、その場合、回線1
との電圧の極性を一致させた後に、内線4の極性と自動
ファクシミリ7の回線側の定義された極性とを一致させ
る作業も必要であり、設置工事時の作業をさらに複雑に
するという問題点があった。
Also, some automatic facsimiles define the voltage polarity of the connected line, in which case line 1
After matching the polarity of the voltage with the automatic facsimile 7, it is also necessary to match the polarity of the extension 4 with the polarity defined on the line side of the automatic facsimile 7, which further complicates the installation work. was there.

この発明は、かかる問題点を解決するためになされたも
゛ので、電話網の回線から得られる直流電圧の極性と網
接続制御装置内部の極性とを、複雑な工事を行うことな
く一致させて、接続されるファクシミリ等の端末を正常
に動作させる網接続制御装置を得ることを目的とする。
This invention has been made to solve this problem, and is capable of matching the polarity of the DC voltage obtained from the telephone network line with the polarity inside the network connection control device without performing complicated construction. The object of the present invention is to provide a network connection control device that allows connected terminals such as facsimile machines to operate normally.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係る網接続制御装置は、回線から送出される
電圧の極性を検出する極性検出回路と、回線から送出さ
れる電圧の極性を反転する極性一致回路と、極性検出回
路によって検出された極性と網接続制御装置内で端末に
印加される電圧の極性とが異なるときに極性一致回路を
動作させたのち、回線と端末とを接続させる制御回路と
を設けたものである。
The network connection control device according to the present invention includes a polarity detection circuit that detects the polarity of the voltage sent out from the line, a polarity matching circuit that inverts the polarity of the voltage sent out from the line, and a polarity detection circuit that detects the polarity of the voltage sent out from the line. and a control circuit that connects the line and the terminal after operating a polarity matching circuit when the polarity of the voltage applied to the terminal in the network connection control device is different.

〔作用) この発明においては、極性検出回路によって検出される
回線から送出される電圧の極性と、端末に印加される電
圧の極性とが異なるときに、制御回路は極性一致回路に
よって回線から送出される電圧の極性を反転させたのち
、回線と端末とを接続させる。
[Operation] In this invention, when the polarity of the voltage sent out from the line detected by the polarity detection circuit and the polarity of the voltage applied to the terminal are different, the control circuit detects the voltage sent out from the line by the polarity matching circuit. After reversing the polarity of the voltage, connect the line and terminal.

(実施例) 第1図はこの発明の網接続制御装置の一実施例の構成を
示す図である。この図において、第3図と同一符号は同
一部分を示し、16は着信検出回路、17は極性検出回
路、18は外付の着信選択スイッチ、SW5〜SW7は
内線切替用のリレースイッチ、SW8は極性一致回路で
ある極性切替用のリレースイッチ、200は制御回路で
ある。
(Embodiment) FIG. 1 is a diagram showing the configuration of an embodiment of a network connection control device of the present invention. In this figure, the same symbols as in FIG. 3 indicate the same parts, 16 is an incoming call detection circuit, 17 is a polarity detection circuit, 18 is an external incoming call selection switch, SW5 to SW7 are relay switches for switching extensions, and SW8 is A relay switch 200 for switching polarity, which is a polarity matching circuit, is a control circuit.

次に動作について説明する。Next, the operation will be explained.

電源投入時、または着信検出回路16が着信を検出して
おらず、かつループ監視回路9〜11が内線2〜4に接
続された電話機5.6および自動ファクシミリ7が内線
を捕捉していない(ループオフ)空の状態の時に、制御
回路200は回線1の電圧の極性を極性検出回路17に
より検出して、この極性と内線2〜4にループ電流を供
給している電源15の電圧(−EV)の極性とが異なっ
ていれば、リレースイッチSW8により回線1の電圧の
極性を反転させてこれらの極性をあらかじめ一致させて
おく。
When the power is turned on, or the incoming call detection circuit 16 has not detected an incoming call, and the loop monitoring circuits 9 to 11 have not captured the extensions by the telephone 5.6 connected to the extensions 2 to 4 and the automatic facsimile machine 7 ( loop off) When the control circuit 200 is in an empty state, the control circuit 200 detects the polarity of the voltage on line 1 using the polarity detection circuit 17, and compares this polarity with the voltage (-EV ) are different from each other, the relay switch SW8 inverts the polarity of the voltage on the line 1 to make these polarities match in advance.

次に内線4に接続されたファクシミリ7により発呼する
時、制御回路200は、電源15の電圧(−EV)によ
り供給されるループ電流によるループオンがループ監視
回路11によって、例えば100m5検出されたか否か
を判断し、100m5検出されればリレースイッチSW
7をオンすることにより電話網の回線1を捕捉する。こ
の時、自動ファクシミリ7に印加される軍属は電源15
の電圧(−EV)から回線1より送出される電話網の電
圧に切替るが、あらかじめリレースイッチSW8により
極性が一致されているために、回線1の捕捉時に極性が
反転することがなくなり、自動ファクシミリ7からのダ
イヤルが可能となる。
Next, when making a call using the facsimile 7 connected to the extension 4, the control circuit 200 determines whether the loop monitoring circuit 11 detects, for example, 100m5, that a loop-on state is caused by the loop current supplied by the voltage (-EV) of the power supply 15. If 100m5 is detected, relay switch SW is activated.
By turning on 7, line 1 of the telephone network is captured. At this time, the military power applied to the automatic facsimile 7 is the power supply 15.
voltage (-EV) is switched to the voltage of the telephone network sent out from line 1, but since the polarity has been matched in advance by relay switch SW8, the polarity will not be reversed when line 1 is captured, and automatic switching will occur. Dial from facsimile 7 becomes possible.

この後自動ファクシミリ7はダイヤル後の電話網からの
極性反転を極性検出回路17によって検出することによ
り、所定のモデム信号(CNG)を送出する。
Thereafter, the automatic facsimile 7 sends out a predetermined modem signal (CNG) by detecting the polarity reversal from the telephone network after dialing by the polarity detection circuit 17.

第1図の網接続制御装置が、例えば外付の着信選択スイ
ッチ18により、電話網からの着信を内線2.3.4に
切替えられる状態で、内線4が選択されている場合には
、着信検出回路16により着信検出が行なわれると(こ
の時極性は反転している)、制御回路2o○はリレース
イッチSW7をオンにして電話網からのリング信号を内
線4に送る。この時、リレースイツイSW8により電話
網の極性が空の状態の時に合わされているので、内線4
には極性反転の状態が得られる。
If the network connection control device shown in FIG. 1 is in a state where the external call selection switch 18 can switch incoming calls from the telephone network to extensions 2, 3, and 4, and extension 4 is selected, the incoming call is When the detection circuit 16 detects an incoming call (at this time, the polarity is reversed), the control circuit 2o○ turns on the relay switch SW7 and sends a ring signal from the telephone network to the extension 4. At this time, the polarity of the telephone network is matched by relay switch SW8 when it is empty, so extension 4
A state of polarity reversal is obtained.

また、例えば電話機5に着信が有り、通話後(電話機5
で応答した時、網の極性は元にもどる)に、自動ファク
シミリ7に手動着信をさせるために内線転送を行って着
信させる場合は、内線4に接続を切替るためのダイヤル
パルスを送出し、これがループ監視回路9で検出される
ことにより制御回路200がループ作成回路8に電話網
の回線1を捕捉させるとともに゛、リレースイッチSW
Iをリング発生器13側へ、通話を行うためにオンにな
っているリレースイッチSW5をオフに、リレースイッ
チSW7をオンにする。そして、この切替が行われるこ
とにより、リング発生器13で発生されたリング信号が
自動ファクシミリ7に送出されて着信が行われる。次い
でこの自動ファクシミリ7でループがオンにされると、
ループ監視回路11によりループオンが検出され、制御
回路200がリレースイッチSWIを元に戻す。この場
合、リレースイッチSW7の切替によって得られる電源
15の電圧(−EV)と電源14の電圧(+EV)に携
わる一連の動作は、リレースイッチSW8によりすでに
電源15の電圧(−EV)と回線1の電圧極性とが一致
していることにより、通常の電話網からの着信時の極性
変化と同一の動作が内線4について行われる。
Also, for example, if there is an incoming call on the telephone 5, and after the call (the telephone 5
(When the call is answered, the network polarity returns to the original).If the automatic facsimile machine 7 is to manually receive the call by transferring the call to the extension, a dial pulse is sent to extension 4 to switch the connection. When this is detected by the loop monitoring circuit 9, the control circuit 200 causes the loop creation circuit 8 to capture the telephone network line 1, and also switches the relay switch SW.
I to the ring generator 13 side, turn off the relay switch SW5, which is turned on for making a call, and turn on the relay switch SW7. When this switching is performed, the ring signal generated by the ring generator 13 is sent to the automatic facsimile machine 7, and a call is received. Then when the loop is turned on in this automatic fax machine 7,
Loop-on is detected by the loop monitoring circuit 11, and the control circuit 200 returns the relay switch SWI to its original state. In this case, a series of operations related to the voltage (-EV) of the power source 15 and the voltage (+EV) of the power source 14 obtained by switching the relay switch SW7 have already been performed with the voltage (-EV) of the power source 15 and the voltage (+EV) of the power source 14 obtained by switching the relay switch SW8. Since the voltage polarities of the extension line 4 and the voltage polarity of the extension line 4 match, the same operation as the polarity change when receiving a call from a normal telephone network is performed for the extension line 4.

すなわち、回線1からの着信動作は、着信時一旦極性が
反転するとともに、リング信号が送信され、この時自動
ファクシミリ7等の端末が着信を検出してループオンで
応答し、その応答により電話網側が極性を元に戻すわけ
である(すなわち、電源15の電圧(−EV)となる)
。しかし、この場合、リレースイツイSW8により電源
15の電圧(−EV)と回線1の極性とがすでに一致し
ているので、リング発生器13によるリング発生時の電
源14の電圧(+EV)が極性反転となり、リレースイ
ッチSWIを切替えた時(元に戻した時)に、電源15
の電圧(−EV)と同じ極性が網から送られてくるため
、回線1からの着信動作と同動作が得られるのである。
In other words, when a call is received from line 1, the polarity is reversed and a ring signal is sent. At this time, a terminal such as the automatic facsimile 7 detects the call and responds by loop-on, and the response causes the telephone network to The polarity is returned to its original state (that is, the voltage of the power supply 15 (-EV))
. However, in this case, since the voltage (-EV) of the power supply 15 and the polarity of the line 1 are already the same due to the relay switch SW8, the voltage (+EV) of the power supply 14 when the ring generator 13 generates a ring is reversed in polarity. , when the relay switch SWI is switched (returned to its original state), the power supply 15
Since the same polarity as the voltage (-EV) is sent from the network, the same operation as incoming calls from line 1 can be obtained.

したがって、発着信動作において、電圧の極性を監視し
て所定の動作を行なう自動ファクシミリ7のような非電
話系の端末を内線4に接続しても、電話網の電圧の極性
変化と同一の動作を得ることができ、接続された端末を
誤動作させることなく安定に動作させることが可能とな
る。
Therefore, even if a non-telephone terminal such as an automatic facsimile machine 7, which monitors voltage polarity and performs predetermined operations during call/receive operations, is connected to extension 4, the same operation will occur as the voltage polarity changes in the telephone network. This allows the connected terminals to operate stably without malfunctioning.

一般的には、着信検出回路16、極性検出回路17は網
接続制御装置に具備されているものであるので、実際は
リレースイッチSW8を追加するだけで、この発明の網
接続制御装置を容易に実現することができる。
Generally, the incoming call detection circuit 16 and the polarity detection circuit 17 are included in a network connection control device, so in reality, the network connection control device of the present invention can be easily realized by simply adding a relay switch SW8. can do.

また、第2図は複数の回線に対応するこの発明の他の実
施例の構成の概略を示す図である。この図において、第
1図と同一符号は同一を部分を示し、1a、1bは回線
、13a、13bはリング発生器、14a、14bは電
源、19a、19bはNCUで、着信検出回路と極性検
出回路とループ作成回路とから構成されている。5W1
a、5Wlbはリング発生器切替用のリレースイッチ、
5W8a、5W8bは極性切替用のリレースイッチ、S
W9は回線選択用のリレースイッチである。
Further, FIG. 2 is a diagram schematically showing the configuration of another embodiment of the present invention that supports a plurality of lines. In this figure, the same symbols as in Figure 1 indicate the same parts, 1a and 1b are lines, 13a and 13b are ring generators, 14a and 14b are power supplies, 19a and 19b are NCUs, and an incoming call detection circuit and a polarity detection circuit. It consists of a circuit and a loop creation circuit. 5W1
a, 5Wlb is a relay switch for switching the ring generator,
5W8a, 5W8b are relay switches for polarity switching, S
W9 is a relay switch for line selection.

この実施例は電話網の回線数が2.内線数が3の場合の
構成例であり、第1図に示した実施例と同様にリレース
イッチ5W9aまたは5w5bにより電圧極性を一致さ
せることができる。
In this embodiment, the number of lines in the telephone network is 2. This is an example of a configuration in which the number of extensions is three, and voltage polarities can be matched by relay switch 5W9a or 5w5b, similar to the embodiment shown in FIG.

なお、上記実施例では、電話網の回線数が2以下の場合
を示したが、回線数に応じてNCU、リレースイッチ数
等を増すことにより電話網が3回線以上の網接続制御装
置についても同様の効果を得られる。
In the above embodiment, the case where the number of telephone network lines is 2 or less is shown, but it can also be applied to a network connection control device with a telephone network of 3 or more lines by increasing the number of NCUs, relay switches, etc. according to the number of lines. You can get the same effect.

また、上記実施例では内線転送をダイヤルパルスによっ
て行う構成の場合を説明したが、内線転送をPB信号に
より行う構成の場合についても同様である。
Further, in the above embodiment, a case has been described in which the extension transfer is performed using a dial pulse, but the same applies to a structure in which the extension transfer is performed using a PB signal.

〔発明の効果〕〔Effect of the invention〕

この発明は以上説明したとおり、回線から送出される電
圧の極性を検出する極性検出回路と、回線から送出され
る電圧の極性を反転する極性一致回路と、極性検出回路
によフて検出された極性と網接続制御装置内で端末に印
加される電圧の極性とが異なるときに極性一致回路を動
作させたのち、回線と端末とを接続させる制御回路とを
設けたので、各種用途の端末を極性の不一致によフて誤
動作させることなく、確実に動作させることが可能にな
るという効果がある。
As explained above, this invention uses a polarity detection circuit that detects the polarity of the voltage sent out from the line, a polarity matching circuit that inverts the polarity of the voltage sent out from the line, and a polarity detection circuit that detects the polarity of the voltage sent out from the line. We installed a control circuit that operates a polarity matching circuit when the polarity and the polarity of the voltage applied to the terminal in the network connection control device are different, and then connects the line and terminal, making it possible to connect terminals for various purposes. This has the effect of making it possible to operate reliably without causing malfunctions due to polarity mismatch.

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

第1図はこの発明の網接続制御装置の一実施例の構成を
示す図、第2図はこの発明の他の実施例の構成の概略を
示す図、第3図は従来の網接続制御装置の構成の概略を
示す図である。。 図中、1、la、1bは回線、2〜4は内線、5.6は
電話機、7は自動ファクシミリ、8はループ作成回路、
9.10.11はループ監視回路、12,12a、12
bは保護回路、13゜i3a、13bはリング発生器、
14,14a。 14b、15は電源、16は着信検出回路、17は極性
検出回路、18は着信選択スイッチ、19a、19bは
NCU、SWI、SWI a、5WIb、SW5.SW
6.SW7.5W8a、SW8第1図 SWi、SW5.SW6.SW7°リレースイッチ第2
FIG. 1 is a diagram showing the configuration of one embodiment of the network connection control device of the present invention, FIG. 2 is a diagram showing an outline of the configuration of another embodiment of the invention, and FIG. 3 is a diagram showing the configuration of a conventional network connection control device. FIG. 2 is a diagram schematically showing the configuration of. . In the figure, 1, la, 1b are lines, 2 to 4 are extensions, 5.6 is a telephone, 7 is an automatic facsimile, 8 is a loop creation circuit,
9.10.11 is loop monitoring circuit, 12, 12a, 12
b is a protection circuit, 13゜i3a, 13b is a ring generator,
14, 14a. 14b, 15 are power supplies, 16 is an incoming call detection circuit, 17 is a polarity detection circuit, 18 is an incoming call selection switch, 19a, 19b are NCU, SWI, SWI a, 5WIb, SW5. SW
6. SW7.5W8a, SW8 Figure 1 SWi, SW5. SW6. SW7° relay switch 2nd
figure

Claims (1)

【特許請求の範囲】[Claims] 電話網の回線を複数の内線に分岐交換し、前記内線に電
圧の極性を監視して所定の動作を行う端末が接続される
網接続制御装置において、前記回線から送出される電圧
の極性を検出する極性検出回路と、前記回線から送出さ
れる電圧の極性を反転する極性一致回路と、前記極性検
出回路によって検出された極性と前記網接続制御装置内
で前記端末に印加される電圧の極性とが異なるときに前
記極性一致回路を動作させたのち、前記回線と前記端末
とを接続させる制御回路とを設けたことを特徴とする網
接続制御装置。
In a network connection control device in which a telephone network line is branched and exchanged into a plurality of extension lines, and a terminal that monitors the voltage polarity and performs a predetermined operation is connected to the extension line, the polarity of the voltage sent from the line is detected. a polarity detection circuit that inverts the polarity of the voltage sent from the line; and a polarity matching circuit that inverts the polarity of the voltage sent from the line, and the polarity detected by the polarity detection circuit and the polarity of the voltage applied to the terminal within the network connection control device. A network connection control device comprising: a control circuit that connects the line and the terminal after operating the polarity matching circuit when the polarity is different.
JP61296540A 1986-12-15 1986-12-15 Network connection control device Expired - Fee Related JPH0754952B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61296540A JPH0754952B2 (en) 1986-12-15 1986-12-15 Network connection control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61296540A JPH0754952B2 (en) 1986-12-15 1986-12-15 Network connection control device

Publications (2)

Publication Number Publication Date
JPS63149957A true JPS63149957A (en) 1988-06-22
JPH0754952B2 JPH0754952B2 (en) 1995-06-07

Family

ID=17834848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61296540A Expired - Fee Related JPH0754952B2 (en) 1986-12-15 1986-12-15 Network connection control device

Country Status (1)

Country Link
JP (1) JPH0754952B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518772A (en) * 1993-04-28 1996-05-21 Kawasaki Steel Corporation Method for adjusting coating weight by gas wiping

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5373005A (en) * 1976-12-13 1978-06-29 Taiko Electric Works Ltd Automatic channel converting system for automatic call answering device
JPS5743955A (en) * 1980-08-28 1982-03-12 Nippon Kokan Kk <Nkk> Preparation of chromium and ferrochromium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5373005A (en) * 1976-12-13 1978-06-29 Taiko Electric Works Ltd Automatic channel converting system for automatic call answering device
JPS5743955A (en) * 1980-08-28 1982-03-12 Nippon Kokan Kk <Nkk> Preparation of chromium and ferrochromium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518772A (en) * 1993-04-28 1996-05-21 Kawasaki Steel Corporation Method for adjusting coating weight by gas wiping

Also Published As

Publication number Publication date
JPH0754952B2 (en) 1995-06-07

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