JPS6120182B2 - - Google Patents
Info
- Publication number
- JPS6120182B2 JPS6120182B2 JP10159880A JP10159880A JPS6120182B2 JP S6120182 B2 JPS6120182 B2 JP S6120182B2 JP 10159880 A JP10159880 A JP 10159880A JP 10159880 A JP10159880 A JP 10159880A JP S6120182 B2 JPS6120182 B2 JP S6120182B2
- Authority
- JP
- Japan
- Prior art keywords
- switch
- power supply
- terminal
- exchange
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001934 delay Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Devices For Supply Of Signal Current (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、給電方式に関し、特に交換機と端末
間でコード信号の送受信を行う手段を有する端末
に対して、交換機より給電を行う方式に関するも
のである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power supply method, and particularly to a method for supplying power from an exchange to a terminal having means for transmitting and receiving code signals between the exchange and the terminal. It is.
従来の電話網においては、電話機と交換機間の
制御信号（発呼信号，選択信号，呼出信号など）
として直流のON／OFF、直流の極性リバース、
多周波信号を用いて端末間の接続動作が行なわれ
ている。該電話網に収容される電話機への給電に
ついては、発信側電話機は発呼から切断に到るま
で交換機から−48Vの直流給電を受け、着信側電
話機は呼出されているときは交換機から高レベル
の交流電圧（120V，16Hz）を受けベルを鳴ら
し、応答があればこのときから切断まで−48Vの
直流給電を受けるようになつている。
In conventional telephone networks, control signals (calling signals, selection signals, ringing signals, etc.) between telephones and exchanges
as DC ON/OFF, DC polarity reversal,
Connection operations between terminals are performed using multi-frequency signals. Regarding power supply to telephones accommodated in the telephone network, the calling telephone receives -48V DC power from the exchange from call origination to disconnection, and the receiving telephone receives high-level DC power from the exchange when it is being called. The system receives AC voltage (120V, 16Hz) and rings the bell, and if there is a response, it receives -48V DC power from this time until disconnection.
また、このような電話網にデータ端末、フアク
シミリ端末などの非電話系端末を収容するには、
加入者線を共用し電話機に付設した形がとられて
おり、この端末間の通信はまず電話機相互で接続
した後に端末側に切替えて行なつている。 In addition, in order to accommodate non-telephone terminals such as data terminals and facsimile terminals in such telephone networks,
The subscriber line is shared and attached to the telephone set, and communication between the terminals is performed by first connecting the telephone sets to each other and then switching to the terminal side.
さて、今後電話網の高度サービス化を図るに
は、電話機（以後、これも端末と呼ぶことにす
る。）あるいは電話機能付データ端末等と交換機
との間の制御信号として豊富な信号種別がとれる
コード信号を用いることが必要となる。 Now, in order to make the telephone network more advanced services in the future, a wide variety of signal types will be available as control signals between telephones (hereinafter referred to as terminals) or data terminals with telephone functions, etc. and exchanges. It is necessary to use code signals.
このように端末と交換機間の制御信号としてコ
ード信号を用いた通信網においても、端末に対し
て従来の電話網と同様−48V直流給電すればこれ
によつて端末の電源回路を駆動させてコード信号
の送受を可能にすることができる。 Even in communication networks that use code signals as control signals between terminals and exchanges, if -48V DC power is supplied to the terminals as in conventional telephone networks, this will drive the terminal's power supply circuit and transmit the code. It is possible to send and receive signals.
しかし、従来の給電手順をそのまま適用する
と、着信側にまわつた端末は、−48V直流給電を
応答後しか受けることができなく、呼出信号につ
いては高レベルの交流電圧（120V，16Hz）をそ
のまま用いることになり、素子耐圧や回路の安定
性等に問題を生じる。 However, if the conventional power supply procedure is applied as is, the terminal on the receiving side will only be able to receive -48V DC power after a response, and the high-level AC voltage (120V, 16Hz) will be used as is for the ringing signal. This causes problems with element breakdown voltage, circuit stability, and the like.
本発明の目的は、この問題を解決するために、
交換機から着信側端末への給電を呼出信号送出前
にできるようにし、呼出信号もコード信号として
の送出を可能として、交換機と端末間のすべての
制御信号をコード信号で送出できる給電方式を提
供することにある。
The purpose of the present invention is to solve this problem by
To provide a power supply system that allows power to be supplied from an exchange to a called terminal before sending out a calling signal, allows the calling signal to be sent as a code signal, and allows all control signals between the exchange and the terminal to be sent as code signals. There is a particular thing.
本発明の給電方式は、端末が交換機から給電を
受けながら、交換機と端末間の制御をすべてコー
ド信号で送受できるようにするために、発信時は
端末の発呼操作によつて端末の電源回路が交換機
の給電用電池から給電を受けられるようにし、こ
の後にコード信号の送受を行ない、着信時は交換
機が給電用電池の極性を反転しその反転を端末の
反転電流検出回路が検出して端末の電源回路が交
換機の給電用電池から給電を受けられるように
し、端末の電源回路が働いたことにより端末の電
流ループ保持回路が動作して、交換機の給電用電
池の極性を元に戻しても端末の電源回路が交換機
の給電用電池から給電を受けられるようにし、こ
れに伴なつて交換機が給電用電池の極性を元に戻
し、この後にコード信号の送受を行ない、切断時
には切断の手順が交換機と端末間で完了した後に
電流ループ保持回路をリセツトさせて交換機から
の給電を停止するようにしたことに特徴がある。
The power supply method of the present invention is such that, while the terminal receives power from the exchange, all controls between the exchange and the terminal can be transmitted and received using code signals. The device receives power from the power supply battery of the exchange, and then sends and receives code signals. When a call is received, the exchange reverses the polarity of the power supply battery, and the terminal's reversal current detection circuit detects this reversal, and the terminal Even if the power supply circuit of the terminal is enabled to receive power from the power supply battery of the exchange, and the power supply circuit of the terminal is activated, the current loop holding circuit of the terminal is activated and the polarity of the power supply battery of the exchange is restored. The power supply circuit of the terminal is enabled to receive power from the power supply battery of the exchanger, and along with this, the exchanger returns the polarity of the power supply battery to its original state.After this, the code signal is sent and received, and the disconnection procedure is performed at the time of disconnection. The feature is that the current loop holding circuit is reset to stop the power supply from the exchange after the connection between the exchange and the terminal is completed.
以下、本発明の実施例を図面により詳細に説明
する。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は、本発明の実施例を示す図であつて、
１は交換機、１１は給電回路、２は加入者線、２
１は加入者線のＡ線、２２は加入者線のＢ線、３
は端末、３１は直流遮断回路、３２は端末入出力
部、３３は電源回路スイツチ部、３４は電源回
路、４は電池、７は電源回路の内部インピーダン
ス、５１，６１はスイツチ、１１０はダイオー
ド、１２０は反転電流検出回路、１３０はフツク
スイツチ等の発呼・応答操作に伴つて働き、オン
フツク（ON HOOK）時OFF状態で、オフフツ
ク（OFF HOOK）時ON状態となるスイツチ、
１４０は反転電流検出回路１２０により駆動され
るスイツチ、１５０はダイオード、１６０は出力
電圧端子、１７０は電流ループ保持回路、１８０
は電流ループ保持回路１７０のリセツト端子、１
９０は電流ループ保持回路により駆動されるスイ
ツチである。 FIG. 1 is a diagram showing an embodiment of the present invention,
1 is an exchange, 11 is a power supply circuit, 2 is a subscriber line, 2
1 is subscriber line A, 22 is subscriber line B, 3
is a terminal, 31 is a DC cutoff circuit, 32 is a terminal input/output section, 33 is a power supply circuit switch section, 34 is a power supply circuit, 4 is a battery, 7 is an internal impedance of the power supply circuit, 51 and 61 are switches, 110 is a diode, 120 is a reverse current detection circuit; 130 is a switch that operates in conjunction with call/response operations such as a hook switch, and is in an OFF state when on-hook (ON HOOK) and is in an ON state when off-hook (OFF HOOK);
140 is a switch driven by the inversion current detection circuit 120, 150 is a diode, 160 is an output voltage terminal, 170 is a current loop holding circuit, 180
is the reset terminal of the current loop holding circuit 170, 1
90 is a switch driven by a current loop holding circuit.
第２図は電流ループ保持回路１７０に対するリ
セツト信号の作成を説明するための図である。 FIG. 2 is a diagram for explaining the creation of a reset signal for the current loop holding circuit 170.
第３図は端末と交換機間におけるコード信号を
用いた制御信号の送受による接続シーケンスと制
御信号送受に対する給電期間を示す図である。 FIG. 3 is a diagram showing a connection sequence for transmitting and receiving control signals using code signals between a terminal and an exchange, and a power supply period for transmitting and receiving control signals.
第４図はフツクスイツチの状態とスイツチb1，
b2の状態とコード信号の送受信可能期間と電源回
路の通電状態に対するタイムチヤートを示す図で
ある。 Figure 4 shows the state of the switch and switch b 1 ,
2 is a diagram showing a time chart for the state of b2, the code signal transmission/reception enable period, and the energization state of the power supply circuit. FIG.
第３図において、斜線で囲まれた部分は、交換
機が端末に対して給電中であることを示してお
り、さらに発着信相互の端末が交換機を介して行
なわれる発呼から終話までの接続シーケンスを示
している。この接続シーケンス上の制御信号はコ
ード信号であるから、コード信号の送受を可能に
するためには、交換機は発着をとわず端末に対し
て端末が最初の信号を送信する前に給電を行な
い、端末が最後の信号を送信した後に給電を停止
する必要がある。これを実現したのが本発明であ
る。 In Figure 3, the area surrounded by diagonal lines indicates that the exchange is supplying power to the terminal, and furthermore, the connection between the calling and receiving terminals from the call origination to the end of the call is made through the exchange. It shows the sequence. The control signal in this connection sequence is a code signal, so in order to enable the transmission and reception of code signals, the exchange must supply power to the terminal before the terminal transmits the first signal, regardless of whether it is arriving or departing. , the terminal needs to stop powering after sending the last signal. The present invention realizes this.
本発明の実施例についてその動作を説明する。
交換機１と端末３とのコード信号の送受信は、交
換機１と端末３の端末入出力部３２が加入者線２
と直流遮断回路３１を介して行ない、この端末入
出力部３２は電源回路３４が交換機１の給電回路
１１から給電を受けているときのみ動作できる。 The operation of an embodiment of the present invention will be explained.
The transmission and reception of code signals between the exchange 1 and the terminal 3 is carried out by the terminal input/output section 32 of the exchange 1 and the terminal 3 using the subscriber line 2.
This terminal input/output section 32 can operate only when the power supply circuit 34 receives power from the power supply circuit 11 of the exchange 1.
端末が空き状態にあるときは、給電回路１１の
スイツチ５１はON状態に、スイツチ６１はOFF
状態（これをノーマル状態という。）になつてい
る。この状態にある端末がフツキング等の発呼操
作を行なうと、電源回路スイツチ部３３のフツク
スイツチ（図示したいない。）と連動しているス
イツチ１３０がON状態になつて、電源回路３４
は交換機１の電池４からインピーダンス７とスイ
ツチ５１と加入者線２とダイオード２６１を介し
て給電を受け動作する。これによつて、端末入出
力部３２は動作可能の状態になつて、交換機１と
のコード信号送受信が可能となる。同時に、電流
ループ保持回路１９０が働いて、スイツチ１９０
をON状態にする。一方、交換機１が端末に着信
させる場合には、まず、交換機１は給電回路１１
のスイツチ５１をOFF状態、スイツチ６１をON
状態（これをリバース状態という。）にする。こ
れによつて、反転電流検出回路１２０がダイオー
ド１１０を介して動作し、スイツチ１４０を駆動
する。この後に交換機１は給電回路１１を元のノ
ーマル状態に戻す。今度はダイオード１５０が導
通状態になつて給電回路１１から電源回路３４は
給電を受けることになり、電流ループ保持回路１
７０が働いて、スイツチ１９０が駆動する。スイ
ツチ１９０が駆動した後は、スイツチ１１０が給
電回路１１がノーマル状態になつているので復旧
する。スイツチ１９０が駆動されたことによつ
て、端末入出力部３２は交換機１からコード信号
の呼出し信号を受信してベル等を鳴動させること
ができる。 When the terminal is idle, the switch 51 of the power supply circuit 11 is in the ON state, and the switch 61 is in the OFF state.
state (this is called the normal state). When the terminal in this state performs a calling operation such as hooking, the switch 130 that is linked to the switch (not shown) of the power circuit switch section 33 turns on, and the power circuit 34
operates by receiving power from the battery 4 of the exchange 1 via the impedance 7, the switch 51, the subscriber line 2 and the diode 261. As a result, the terminal input/output section 32 becomes operational, and can transmit and receive code signals to and from the exchange 1. At the same time, the current loop holding circuit 190 operates and the switch 190
Turn on. On the other hand, when the exchange 1 receives a call from the terminal, the exchange 1 first receives the call from the power supply circuit 11.
Switch 51 is OFF, switch 61 is ON
state (this is called the reverse state). This causes the inverted current detection circuit 120 to operate via the diode 110 and drive the switch 140. After this, the exchange 1 returns the power supply circuit 11 to its original normal state. This time, the diode 150 becomes conductive and the power supply circuit 34 receives power from the power supply circuit 11, and the current loop holding circuit 1
70 is activated, and the switch 190 is activated. After the switch 190 is activated, the switch 110 is restored because the power supply circuit 11 is in the normal state. By driving the switch 190, the terminal input/output section 32 can receive a calling signal of a code signal from the exchange 1 and ring a bell or the like.
給電の停止については、発信側端末が着信側端
末より先にオンフツク等の切断操作を行なうと、
端末入出力部３２は切断要求と判断して、交換機
１に切断信号を送信する。このとき、スイツチ１
３０は直ちに復旧するが、スイツチ１９０はON
HOOKの信号が第２図に示す遅延回路２６０に
よつて切断信号が交換機に到達できる保証時間tG
だけ遅延して電流ループ保持回路１７０のリセツ
ト端子１８０に入力され、スイツチ１３０より保
証期間tGだけ遅れて復旧する。一方着信側端末に
ついてもオンフツク等の切断操作あれば、切断確
認信号を送信し、スイツチ１３０は直ちに復旧
し、スイツチ１９０はスイツチ１３０より保証時
間tGだけ遅れて復旧する。 Regarding stopping the power supply, if the calling terminal performs a disconnection operation such as on-hook before the receiving terminal,
The terminal input/output unit 32 determines that this is a disconnection request and transmits a disconnection signal to the exchange 1. At this time, switch 1
30 is restored immediately, but switch 190 is ON.
Guaranteed time tG for the HOOK signal to reach the switch by the delay circuit 260 shown in FIG.
It is input to the reset terminal 180 of the current loop holding circuit 170 with a delay of tG, and is restored with a delay of the guarantee period tG from the switch 130. On the other hand, if there is a disconnection operation such as on-hook on the receiving side terminal, a disconnection confirmation signal is sent, and the switch 130 is immediately restored, and the switch 190 is restored after a guaranteed time tG than the switch 130.
逆に、着信側端末が発信側端末より先にオンフ
ツク等の切断操作をしても、スイツチ１３０とス
イツチ１９０の動作は前記と同様である。オンフ
ツク動作時送受される信号の方向と種別は第３図
に示す通りである。 Conversely, even if the called terminal performs a disconnection operation such as on-hook before the calling terminal, the operations of switch 130 and switch 190 are the same as described above. The directions and types of signals transmitted and received during on-hook operation are as shown in FIG.
以上の動作におけるタイムチヤートを第４図に
示している。発信側端末では、オフフツクに伴な
い電源回路３４がON状態になり、これに伴なつ
てスイツチb2がON状態になつて、コード信号の
送受信が可能になつている。着信側端末では給電
回路１１のリバース状態に伴ないスイツチb1が
ON状態になつて電源回路３４がON状態になり、
スイツチb2がON状態になるとともにスイツチb1
が復旧して、コード信号の送受信が可能になつて
いる。切断時のオンフツクがあると発着に関係な
くスイツチb2がtG時間だけ遅れて復旧しコード信
号の送受信可能期間をオンフツク時点より延長さ
せている。 A time chart for the above operation is shown in FIG. In the transmitting terminal, the power supply circuit 34 is turned on as the terminal goes off-hook, and accordingly, the switch b2 is turned on, making it possible to transmit and receive code signals. At the receiving terminal, switch b 1 is activated due to the reverse state of the power supply circuit 11.
The power supply circuit 34 becomes ON state.
When switch b 2 turns on, switch b 1
has been restored and it is now possible to send and receive code signals. If there is an on-hook at the time of disconnection, switch b2 recovers with a delay of tG time regardless of whether the aircraft is taking off or arriving, extending the period during which code signals can be transmitted and received from the time of the on-hook.
以上説明したように、本発明によれば、着呼時
に、自動的に端末の電源回路を駆動し、安定化さ
せてからコード信号を用いた制御信号が送受信さ
れるので、交換機側からベル鳴動用の大振幅の交
流信号を送出しなくてもコード信号の呼出信号に
より端末側の発振器を動作させて呼出音を発生さ
せたり、端末の自動応答を行なうことができる。
As explained above, according to the present invention, when a call arrives, the power supply circuit of the terminal is automatically driven and stabilized before a control signal using a code signal is transmitted and received. Even without sending out a large-amplitude alternating current signal, it is possible to operate the oscillator on the terminal side using the ringing signal of the code signal to generate a ringing tone or to automatically answer the terminal.
第１図は本発明の実施例を示す図、第２図は電
流ループ保持回路１７０に対するリセツト信号の
作成を説明するための図、第３図は接続シーケン
スと給電期間との関係を説明するための図、第４
図は実施例のタイムチヤートを示す図である。
１……交換機、１１……給電回路、２……加入
者線、２１……加入者線のＡ線、２２……加入者
線のＢ線、３……端末、３１……直流遮断回路、
３２……端末入出力部、３３……電源回路スイツ
チ部、３４……電源回路、４……電池、５１，６
１……スイツチ、７……電源回路の内部インピー
ダンス、５１，６１……スイツチ、１１０……ダ
イオード、１２０……反転電流検出回路、１３０
……フツクスイツチ等の発呼・応答操作に伴つて
働き、オンフツク（ON HOOK）時OFF状態
で、オフフツク（OFF HOOK）時ON状態とな
るスイツチ、１４０……反転電流検出回路１２０
により駆動されるスイツチ、１５０……ダイオー
ド、１６０……出力電圧端子、１７０……電流ル
ープ保持回路、１８０……電流ループ保持回路１
７０のリセツト端子、１９０……電流ループ保持
回路により駆動されるスイツチ。
FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the creation of a reset signal for the current loop holding circuit 170, and FIG. 3 is a diagram for explaining the relationship between the connection sequence and the power supply period. Figure 4
The figure is a diagram showing a time chart of an example. 1... Exchange, 11... Power supply circuit, 2... Subscriber line, 21... Subscriber line A line, 22... Subscriber line B line, 3... Terminal, 31... DC cutoff circuit,
32...Terminal input/output section, 33...Power circuit switch section, 34...Power circuit, 4...Battery, 51, 6
1...Switch, 7...Internal impedance of power supply circuit, 51, 61...Switch, 110...Diode, 120...Reverse current detection circuit, 130
. . . A switch that operates in conjunction with the call/response operation of a hook switch, etc., and is in the OFF state when on-hook (ON HOOK) and is in the ON state when off-hook (OFF HOOK), 140 . . . Reverse current detection circuit 120
150...Diode, 160...Output voltage terminal, 170...Current loop holding circuit, 180...Current loop holding circuit 1
70 reset terminal, 190 . . . a switch driven by a current loop holding circuit.
Claims (1)
を送受信する手段と初期設定時の電圧極性である
ノーマル状態とノーマル状態とは反転した電圧極
性であるリバース状態のいずれかの状態で給電す
る給電回路を有する交換機が、交換機から給電を
受けた後にコード信号による制御信号を送受信す
る端末に対して給電する給電方式において、端末
には交換機から給電を受け端末の電源として働か
せる手段として、該交換機の給電回路がノーマル
状態のときは、備え付けの第１のスイツチと第２
のスイツチと第３のスイツチのいずれかをON状
態にすると給電が受けられ、リバース状態のとき
はリバース状態を検出して第３のスイツチを働か
せるように構成された電源回路スイツチ部と、該
電源回路スイツチ部を介して交換機の給電回路か
ら給電を受け端末の電源として働く電源回路と、
該電源回路が働くと動作し第２のスイツチをON
状態にする電流ループ保持回路と、該電流ループ
保持回路に対するリセツト信号を遅延させて入力
させる遅延回路を備え、前記第１のスイツチは端
末における発呼・応答・切断等の操作と連動させ
て動作するようにし、端末が空き状態にあるとき
は交換機の給電回路をノーマル状態にして置き、
端末が発呼操作を行なうと前記第１のスイツチを
働かせて端末の電源回路が交換機の給電回路から
給電を受けるようにして、これに伴つて電流ルー
プ保持回路が前記第２のスイツチをON状態に
し、一方、着信側となる端末へは交換機が制御信
号を送出する前に、給電回路をリバース状態にす
ると、電源回路スイツチ部がリバース状態を検出
して前記第３のスイツチをON状態にし、続いて
交換機が給電回路をノーマル状態にすることによ
つて電源回路を給電状態にし、同時に第３のスイ
ツチがOFF状態になりこれに伴つて電流ループ
保持回路が前記第２のスイツチをON状態にし、
さらに、発着のいずれの場合でも、端末が切断操
作を行なうと、前記第１のスイツチを復旧させる
とともに、端末は切断の旨を知らせる制御信号を
交換機へ送出し、遅延回路がこの送出完了までの
時間だけ遅延させてリセツト信号を電流ループ保
持回路に送出して前記第２のスイツチをOFF状
態にすることを特徴とする給電方式。1. Means for transmitting and receiving control signals using code signals to and from terminals, and power supply that supplies power in either the normal state, which is the voltage polarity at the time of initial setting, or the reverse state, which is the voltage polarity reversed from the normal state. In a power supply method in which an exchange having a circuit receives power from the exchange and then supplies power to a terminal that transmits and receives a control signal based on a code signal, the terminal is supplied with power from the exchange and serves as a power source for the terminal. When the power supply circuit is in a normal state, the first switch and the second
When either the switch or the third switch is turned on, power is supplied, and when the switch is in reverse, it detects the reverse state and operates the third switch, and the power supply a power supply circuit that receives power from the power supply circuit of the exchange via the circuit switch section and serves as a power source for the terminal;
When the power supply circuit works, it operates and turns on the second switch.
The first switch is provided with a current loop holding circuit that holds the current loop and a delay circuit that delays and inputs a reset signal to the current loop holding circuit, and the first switch operates in conjunction with operations such as calling, answering, and disconnecting on the terminal. When the terminal is in an idle state, leave the power supply circuit of the exchange in the normal state,
When the terminal performs a call operation, the first switch is operated so that the power supply circuit of the terminal receives power from the power supply circuit of the exchange, and accordingly, the current loop holding circuit turns the second switch ON. On the other hand, before the exchange sends a control signal to the receiving terminal, the power supply circuit is put into the reverse state, and the power supply circuit switch section detects the reverse state and turns the third switch into the ON state, Next, the exchange sets the power supply circuit to the normal state, thereby putting the power supply circuit into the power supply state, and at the same time, the third switch turns OFF, and accordingly, the current loop holding circuit turns the second switch ON. ,
Furthermore, when the terminal performs a disconnection operation in either case of departure or arrival, the first switch is restored, the terminal sends a control signal to the exchange notifying the disconnection, and the delay circuit waits until the transmission is completed. A power feeding method characterized by sending a reset signal to a current loop holding circuit with a delay of time to turn the second switch into an OFF state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10159880A JPS5726948A (en) | 1980-07-24 | 1980-07-24 | Power feeding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10159880A JPS5726948A (en) | 1980-07-24 | 1980-07-24 | Power feeding system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5726948A JPS5726948A (en) | 1982-02-13 |
| JPS6120182B2 true JPS6120182B2 (en) | 1986-05-21 |
Family
ID=14304817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10159880A Granted JPS5726948A (en) | 1980-07-24 | 1980-07-24 | Power feeding system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5726948A (en) |
-
1980
- 1980-07-24 JP JP10159880A patent/JPS5726948A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5726948A (en) | 1982-02-13 |
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