JP3471656B2 - Open circuit detecting circuit for digital subscriber circuit for office power supply and method of detecting open circuit - Google Patents
Open circuit detecting circuit for digital subscriber circuit for office power supply and method of detecting open circuitInfo
- Publication number
- JP3471656B2 JP3471656B2 JP11287499A JP11287499A JP3471656B2 JP 3471656 B2 JP3471656 B2 JP 3471656B2 JP 11287499 A JP11287499 A JP 11287499A JP 11287499 A JP11287499 A JP 11287499A JP 3471656 B2 JP3471656 B2 JP 3471656B2
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- circuit
- open detection
- end side
- current
- 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.)
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Electronic Switches (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＩＳＤＮデジタル
通信システムにおける開放検出に適した局給電対応デジ
タル加入者回路用開放検出回路及びその開放検出方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open detection circuit for a digital subscriber circuit compatible with station power supply, which is suitable for open detection in an ISDN digital communication system, and an open detection method thereof.
【０００２】[0002]
【従来の技術】ＩＳＤＮデジタル通信システムにおける
開放検出を行うための機能は、ＩＳＤＮデジタル通信シ
ステムについて規定したヨーロッパ電信電話通信システ
ムの標準ＥＴＳＩのＥＴＲ０８０に規定されている通
り、局給電対応デジタル加入者回路の重要な機能であ
る。2. Description of the Related Art A function for performing open detection in an ISDN digital communication system is a digital subscriber circuit supporting station power feeding, as specified in ETR080 of standard ETSI of European telephony telephone communication system which defines the ISDN digital communication system. Is an important feature of.
【０００３】従来の局給電デジタル加入者回路用開放検
出回路では、シャント抵抗を給電線に挿入して給電電流
を電圧に換算し、コンパレータで比較する方式をとって
いる。In the conventional open detection circuit for a station-fed digital subscriber circuit, a shunt resistor is inserted in a feed line to convert a feed current into a voltage, and a comparator is used for comparison.
【０００４】[0004]
【発明が解決しようとする課題】ところが、上述した従
来の方式では、シャント抵抗で電圧降下が発生するた
め、比較電圧値を大きくすることができない。この場
合、動作が不安定になりやすいため、動作を安定させる
ために、コンパレータ用の電源を必要とするという問題
がある。しかも、直接、給電電圧をコンパレータ用電源
としようとすると、消費電力が増加するという問題もあ
る。However, in the above-mentioned conventional method, the voltage drop occurs in the shunt resistor, and therefore the comparison voltage value cannot be increased. In this case, the operation tends to be unstable, so that there is a problem that a power supply for the comparator is required to stabilize the operation. Moreover, if the power supply voltage is directly used as the power supply for the comparator, there is a problem that the power consumption increases.
【０００５】本発明は、このような状況に鑑みてなされ
たものであり、消費電力の増加を招くことなく、安定し
た動作で開放検出を行うことができる局給電対応デジタ
ル加入者回路用開放検出回路及びその開放検出方法を提
供することができるようにするものである。The present invention has been made in view of such a situation, and it is possible to detect an open circuit for a station power feeding type digital subscriber circuit which can perform a stable operation without causing an increase in power consumption. A circuit and its open detection method can be provided.
【０００６】[0006]
【課題を解決するための手段】請求項１に記載の局給電
対応デジタル加入者回路用開放検出回路は、屋外伝送線
路を介して加入者宅に配置された網終端装置に接続さ
れ、網終端装置での電力の消費状態の検出を行う局給電
対応デジタル加入者回路用開放検出回路であって、入力
端子間に並列接続されるとともに、ベースが入力端子の
正電位側に接続された第１のトランジスタと、第１のト
ランジスタの一端側と入力端子の負電位側との間に接続
された抵抗と、入力端子間に並列接続されるとともに、
ベースがダイオードを介して第１のトランジスタの一端
側に接続された第２のトランジスタと、第２のトランジ
スタを流れる電流により、網終端装置又は網終端装置と
の間の加入者ケーブルの異常を示す開放検出信号を出力
する開放検出信号出力手段とを備え、第１のトランジス
タの一端側と他端側との飽和電圧は、第２のトランジス
タの一端側及びベース間の遮断電圧とダイオードの順方
向電圧の和より小さくされていることを特徴とする。ま
た、第１のトランジスタの一端側はコレクタであり、第
２のトランジスタの一端側はエミッタであるようにする
ことができる。また、開放検出信号出力手段は、第２の
トランジスタのコレクタ側に接続されたホトカプラと、
ホトカプラの動作によって開放検出信号を出力する開放
検出信号送出端子とを備えるようにすることができる。
請求項４に記載の局給電対応デジタル加入者回路用開放
検出回路の開放検出方法は、屋外伝送線路を介して加入
者宅に配置された網終端装置に接続され、網終端装置で
の電力の消費状態の検出を行う局給電対応デジタル加入
者回路用開放検出回路の開放検出方法であって、入力端
子間に並列接続されるとともに、ベースが入力端子の正
電位側に接続された第１のトランジスタに第１の電流を
流す第１の工程と、第１のトランジスタの一端側と入力
端子の負電位側との間に接続された抵抗に第１の電流を
流す第２の工程と、入力端子間に並列接続されるととも
に、ベースがダイオードを介して第１のトランジスタの
一端側に接続された第２のトランジスタに、第１の電流
が減少したとき第２の電流を流す第３の工程と、第２の
電流により、網終端装置又は網終端装置との間の加入者
ケーブルの異常を示す開放検出信号を出力する第４の工
程と、第１のトランジスタの一端側と他端側との飽和電
圧を、第２のトランジスタの一端側及びベース間の遮断
電圧とダイオードの順方向電圧の和より小さくする第５
の工程とを備えることを特徴とする。また、第１の工程
には、第１のトランジスタのベース−コレクタ間に第１
の電流を流す工程が含まれ、第３の工程には、第２のト
ランジスタのエミッタ−ベース間に第２の電流を流す工
程が含まれるようにすることができる。また、第４の工
程には、第２のトランジスタのコレクタ側に流れる電流
をホトカプラによって検出する工程と、検出された電流
を開放検出信号として開放検出信号送出端子から出力す
る工程とが含まれるようにすることができる。本発明に
係る局給電対応デジタル加入者回路用開放検出回路及び
その開放検出方法は、第１のトランジスタの一端側と他
端側との飽和電圧を、第２のトランジスタの一端側及び
ベース間の遮断電圧とダイオードの順方向電圧の和より
小さくし、第１のトランジスタに流れる第１の電流が減
少したとき、第２のトランジスタのコレクタ側に流れる
第２の電流をホトカプラによって検出し、開放検出信号
送出端子から開放検出信号を出力するようにする。An open detection circuit for a digital subscriber circuit corresponding to station power supply according to claim 1 is connected to a network terminating device arranged at a subscriber's house via an outdoor transmission line to terminate the network. A digital subscriber circuit open detection circuit for power supply to a station, which detects a power consumption state in a device, the first detection circuit including a parallel connection between input terminals and a base connected to a positive potential side of the input terminals. And a resistor connected between one end of the first transistor and the negative potential side of the input terminal, and in parallel with the input terminal,
An abnormality of the subscriber cable between the second transistor, whose base is connected to one end of the first transistor through the diode, and the current flowing through the second transistor, or the network termination device. And a saturation voltage between one end side and the other end side of the first transistor, a cutoff voltage between the one end side of the second transistor and the base, and a forward direction of the diode. It is characterized in that it is smaller than the sum of the voltages. Further, one end of the first transistor can be a collector and one end of the second transistor can be an emitter. The open detection signal output means includes a photocoupler connected to the collector side of the second transistor,
An opening detection signal transmitting terminal for outputting an opening detection signal by the operation of the photocoupler can be provided.
According to a fourth aspect of the present invention, there is provided an open detection method of an open detection circuit for a digital subscriber circuit for a station power supply, which is connected to a network terminating device arranged at a subscriber's home via an outdoor transmission line, and the power of the network terminating device is detected. An open detection method of an open detection circuit for a digital subscriber circuit for station power supply, which detects a consumption state, comprising: a first connection method in which a base is connected in parallel to input terminals and a base is connected to a positive potential side of the input terminals. A first step of flowing a first current through the transistor; a second step of flowing the first current through a resistor connected between one end of the first transistor and the negative potential side of the input terminal; A third step of flowing a second current when the first current decreases to a second transistor which is connected in parallel between terminals and whose base is connected to one end side of the first transistor through a diode. And the second current causes the net end A fourth step of outputting an open detection signal indicating an abnormality of the subscriber cable between the device or the network terminating device, and the saturation voltage of one end side and the other end side of the first transistor, Fifth less than sum of cut-off voltage between one end side and base and forward voltage of diode
And the steps of. In the first step, the first transistor is provided between the base and collector of the first transistor.
And a step of passing a second current between the emitter and the base of the second transistor can be included in the third step. Further, the fourth step includes a step of detecting a current flowing through the collector side of the second transistor by the photocoupler and a step of outputting the detected current as an open detection signal from the open detection signal sending terminal. Can be According to the present invention, there is provided an open detection circuit for a digital subscriber circuit for station power supply and an open detection method for the same. When the first current flowing through the first transistor is reduced by making it smaller than the sum of the cut-off voltage and the forward voltage of the diode, the second current flowing through the collector side of the second transistor is detected by the photocoupler to detect the open circuit. The release detection signal is output from the signal transmission terminal.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
【０００８】図１は、本発明の局給電対応デジタル加入
者回路用開放検出回路の一実施の形態を示す回路図であ
る。FIG. 1 is a circuit diagram showing an embodiment of an open detection circuit for a digital subscriber circuit for station power supply according to the present invention.
【０００９】図１の局給電対応デジタル加入者回路用開
放検出回路（以下、単に開放検出回路という）は、屋外
伝送線路を介して加入者宅に配置された網終端装置（Ne
twork Terminal １：以下、ＮＴ１という）に接続され
ているものである。An open detection circuit for a digital subscriber circuit (hereinafter, simply referred to as an open detection circuit) for office power feeding shown in FIG. 1 is a network terminating device (Ne) arranged in a subscriber's house through an outdoor transmission line.
twork Terminal 1: hereinafter referred to as NT1).
【００１０】そして、交換機側からＮＴ１で消費する電
力がＮＴ１に供給されるとともに、ＮＴ１を介して通信
が行われる。Then, the power consumed by NT1 is supplied from the exchange side to NT1, and communication is performed via NT1.
【００１１】開放検出回路は、入力端子１−１，１−
２、出力端子２−１，２−２、開放検出信号送出端子１
１−１，１１−２を備えている。The open detection circuit has input terminals 1-1, 1-
2, output terminals 2-1, 2-2, open detection signal transmission terminal 1
1-1 and 11-2 are provided.
【００１２】入力端子１−１，１−２は、図示しない局
給電用入力電圧源に接続されている。出力端子２−１，
２−２は、図示しない後段の回路、図示しない屋外伝送
線路、図示しないＮＴ１を含む負荷に接続されている。The input terminals 1-1 and 1-2 are connected to an unillustrated station power supply input voltage source. Output terminal 2-1
Reference numeral 2-2 is connected to a circuit in the subsequent stage (not shown), an outdoor transmission line (not shown), and a load including NT1 (not shown).
【００１３】ここで、入力端子１−１及び出力端子２−
１が正電位であり、入力端子１−２及び出力端子２−２
が負電位となっている。このため、電流の流れる方向
は、入力端子１−１から出力端子２−１、出力端子２−
２から入力端子１−２となる。Here, the input terminal 1-1 and the output terminal 2-
1 is a positive potential, and the input terminal 1-2 and the output terminal 2-2
Has a negative potential. Therefore, the direction of current flow is from the input terminal 1-1 to the output terminal 2-1 and the output terminal 2-.
2 becomes the input terminal 1-2.
【００１４】入力端子１−１，１−２間には、第２のト
ランジスタとしてのトランジスタ３、ホトカプラのホト
ダイオード４−１、抵抗５が並列接続されている。ま
た、トランジスタ３のコレクタは、ホトカプラのホトダ
イオード４−１のアノードに接続されている。ホトダイ
オード４−１のカソードは、抵抗５を介して負電位の入
力端子１−２に接続されている。A transistor 3 as a second transistor, a photodiode 4-1 of a photocoupler, and a resistor 5 are connected in parallel between the input terminals 1-1 and 1-2. The collector of the transistor 3 is connected to the anode of the photodiode 4-1 of the photocoupler. The cathode of the photodiode 4-1 is connected to the negative potential input terminal 1-2 via the resistor 5.
【００１５】ホトカプラのホトトランジスタ４−２のエ
ミッタ及びコレクタは、それぞれ開放検出信号送出端子
１１−１，１１−２に接続されている。これら開放検出
信号送出端子１１−１，１１−２から送出される開放検
出信号は、局給電対応デジタル加入者回路の局給電制御
に使用される。The emitter and collector of the phototransistor 4-2 of the photocoupler are connected to the open detection signal transmission terminals 11-1 and 11-2, respectively. The open detection signals sent from these open detection signal sending terminals 11-1 and 11-2 are used to control the station power supply of the digital subscriber circuit corresponding to the station power supply.
【００１６】また、入力端子１−１，１−２間には、第
１のトランジスタとしてのトランジスタ８及び抵抗１０
が並列接続されている。トランジスタ８のコレクタに
は、抵抗１０が接続されている。また、トランジスタ３
のベースとトランジスタ８のコレクタとの間には、ダイ
オード６が接続されている。トランジスタ８のベースに
は、抵抗９が接続されている。A transistor 8 as a first transistor and a resistor 10 are provided between the input terminals 1-1 and 1-2.
Are connected in parallel. A resistor 10 is connected to the collector of the transistor 8. Also, the transistor 3
A diode 6 is connected between the base of and the collector of the transistor 8. A resistor 9 is connected to the base of the transistor 8.
【００１７】さらに、入力端子１−１と出力端子２−１
との間には、抵抗７が接続されている。ここで、抵抗７
とトランジスタ８のエミッタ−ベース間を流れる電流の
和が図示しない入力電圧源から図示しないＮＴ１を含む
負荷に供給される給電電流である。Furthermore, the input terminal 1-1 and the output terminal 2-1.
A resistor 7 is connected between and. Where resistor 7
And the sum of the currents flowing between the emitter and the base of the transistor 8 is the power supply current supplied from the input voltage source (not shown) to the load including NT1 (not shown).
【００１８】抵抗９は動作原理上、不要であるがトラン
ジスタ８のベース遮断電流特性と開放検出電流設定値に
より必要となる場合がある。The resistor 9 is not necessary in operation principle, but it may be necessary depending on the base cutoff current characteristic of the transistor 8 and the open detection current setting value.
【００１９】次に、このような構成の局給電対応デジタ
ル加入者回路用開放検出回路の動作について説明する。Next, the operation of the open detection circuit for the digital subscriber circuit having the above-mentioned structure and adapted to station power supply will be described.
【００２０】まず、ＮＴ１が正常に動作している通常動
作時においては、給電電流がトランジスタ８のベース電
流として流れている。このとき、トランジスタ８は、飽
和状態となっている。First, during the normal operation in which the NT1 is operating normally, the feeding current flows as the base current of the transistor 8. At this time, the transistor 8 is in a saturated state.
【００２１】またこのとき、トランジスタ８のエミッタ
−コレクタの飽和電圧は、トランジスタ３のエミッタ−
ベースの遮断電圧とダイオード６の順方向電圧の和より
小さくなっている。At this time, the saturation voltage of the emitter-collector of the transistor 8 is
It is smaller than the sum of the cutoff voltage of the base and the forward voltage of the diode 6.
【００２２】トランジスタ３が遮断状態のとき、ホトカ
プラのホトダイオード４−１には順方向電流が流れな
い。このとき、ホトカプラのホトトランジスタ４−２は
遮断状態となるため、開放検出信号送出端子１１−１，
１１−２からは開放検出信号が送出されない。When the transistor 3 is cut off, no forward current flows through the photodiode 4-1 of the photocoupler. At this time, since the phototransistor 4-2 of the photocoupler is in the cutoff state, the open detection signal transmission terminal 11-1,
No release detection signal is sent from 11-2.
【００２３】そして、ＮＴ１が何らかの原因により通信
不能であって高抵抗状態となると、給電電流が減少す
る。このとき、トランジスタ８のベース電流が減少す
る。このため、トランジスタ８は遮断状態へ移行し、ト
ランジスタ３のベース電流がダイオード６と抵抗１０を
介して流れる。When NT1 is unable to communicate for some reason and is in a high resistance state, the power supply current decreases. At this time, the base current of the transistor 8 decreases. Therefore, the transistor 8 shifts to the cutoff state, and the base current of the transistor 3 flows through the diode 6 and the resistor 10.
【００２４】このとき、トランジスタ３は飽和状態とな
る。これにより、ホトカプラのホトダイオード４−１に
順方向電流が流れ、ホトカプラのホトトランジスタ４−
２が飽和状態となることで、開放検出信号送出端子１１
−１，１１−２から開放検出信号が送出される。At this time, the transistor 3 becomes saturated. As a result, a forward current flows through the photodiode 4-1 of the photocoupler, and the phototransistor 4-of the photocoupler 4- is provided.
When 2 is saturated, the open detection signal transmission terminal 11
Release detection signals are sent from -1, 11-2.
【００２５】このように、本実施の形態では、トランジ
スタ８のエミッタ−コレクタの飽和電圧を、トランジス
タ３のエミッタ−ベースの遮断電圧とダイオード６の順
方向電圧との和より小さくし、トランジスタ８に流れる
電流が減少したとき、トランジスタ３のコレクタ側に流
れる電流をホトカプラのホトダイオード４−１及びホト
トランジスタ４−２によって検出し、開放検出信号送出
端子１１−１，１１−２から開放検出信号を出力するよ
うにした。As described above, in this embodiment, the saturation voltage of the emitter-collector of the transistor 8 is made smaller than the sum of the cut-off voltage of the emitter-base of the transistor 3 and the forward voltage of the diode 6, and the transistor 8 is When the flowing current decreases, the current flowing to the collector side of the transistor 3 is detected by the photodiode 4-1 and the phototransistor 4-2 of the photocoupler, and the open detection signal is output from the open detection signal sending terminals 11-1 and 11-2. I decided to do it.
【００２６】これにより、給電用電源以外の電源を必要
とせず、しかも従来のような比較電圧値を大きくする必
要もなくなるため、消費電力の増加を招くことなく、安
定した動作で開放検出を行うことができる。As a result, a power supply other than the power supply for power supply is not required, and it is not necessary to increase the comparison voltage value as in the conventional case. Therefore, the open detection is performed in a stable operation without increasing the power consumption. be able to.
【００２７】[0027]
【発明の効果】以上の如く本発明に係る局給電対応デジ
タル加入者回路用開放検出回路及びその開放検出方法に
よれば、第１のトランジスタの一端側と他端側との飽和
電圧を、第２のトランジスタの一端側及びベース間の遮
断電圧とダイオードの順方向電圧の和より小さくし、第
１のトランジスタに流れる第１の電流が減少したとき、
第２のトランジスタのコレクタ側に流れる第２の電流を
ホトカプラによって検出し、開放検出信号送出端子から
開放検出信号を出力するようにしたので、消費電力の増
加を招くことなく、安定した動作で開放検出を行うこと
ができる。As described above, according to the open detection circuit for a digital subscriber circuit and the open detection method for a station power feed according to the present invention, the saturation voltage between the one end side and the other end side of the first transistor is When the cutoff voltage between the one end side and the base of the second transistor and the forward voltage of the diode is made smaller than the first current flowing through the first transistor,
Since the second current flowing through the collector side of the second transistor is detected by the photocoupler and the open detection signal is output from the open detection signal transmission terminal, the open operation is stable and does not increase the power consumption. Detection can be performed.
【図１】本発明の局給電対応デジタル加入者回路用開放
検出回路の一実施の形態を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of an open detection circuit for a digital subscriber circuit supporting station power feeding according to the present invention.
１−１，１−２ 入力端子 ２−１，２−２ 出力端子 ３，８ トランジスタ ４−１ ホトダイオード ４−２ ホトトランジスタ ５，９，７，１０ 抵抗 ６ ダイオード １１−１，１１−２ 開放検出信号送出端子 1-1, 1-2 input terminals 2-1 and 2-2 output terminals 3,8 transistors 4-1 Photodiode 4-2 Phototransistor 5,9,7,10 resistance 6 diode 11-1, 11-2 Release detection signal sending terminal
フロントページの続き (72)発明者 風間 健一 岩手県一関市柄貝１番地 東北日本電気 株式会社内 (72)発明者 金野 文博 岩手県一関市柄貝１番地 東北日本電気 株式会社内 (72)発明者 高橋 亮人 岩手県一関市柄貝１番地 東北日本電気 株式会社内 (56)参考文献 特開 平４−207393（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04Q 3/42 104 Front Page Continuation (72) Inventor Kenichi Kazama, Ikoseki City, Iwate Prefecture 1 Kaigai, Tohoku Nippon Electric Co., Ltd. (72) Inventor Fumihiro Konno 1 Ikeki City, Iwate Prefecture Kaigai, Tohoku NEC Corporation (72) Ryoto Takahashi, No. 1, Kakai, Ichinoseki City, Iwate Prefecture, Tohoku NEC Corporation (56) References JP-A-4-207393 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H04Q 3/42 104
Claims (6)
れた網終端装置に接続され、前記網終端装置での電力の
消費状態の検出を行う局給電対応デジタル加入者回路用
開放検出回路であって、 入力端子間に並列接続されるとともに、ベースが前記入
力端子の正電位側に接続された第１のトランジスタと、 前記第１のトランジスタの一端側と前記入力端子の負電
位側との間に接続された抵抗と、 前記入力端子間に並列接続されるとともに、ベースがダ
イオードを介して前記第１のトランジスタの一端側に接
続された第２のトランジスタと、 前記第２のトランジスタを流れる電流により、前記網終
端装置又は前記網終端装置との間の加入者ケーブルの異
常を示す開放検出信号を出力する開放検出信号出力手段
とを備え、 前記第１のトランジスタの一端側と他端側との飽和電圧
は、前記第２のトランジスタの一端側及びベース間の遮
断電圧と前記ダイオードの順方向電圧の和より小さくさ
れていることを特徴とする局給電対応デジタル加入者回
路用開放検出回路。1. An open detection circuit for a station-feeding digital subscriber circuit, which is connected via an outdoor transmission line to a network terminating device disposed in a subscriber's house and detects the power consumption state of the network terminating device. And a first transistor connected in parallel between the input terminals and having a base connected to the positive potential side of the input terminal; one end side of the first transistor and a negative potential side of the input terminal; A second transistor connected in parallel between the input terminals and a second transistor whose base is connected to one end side of the first transistor through a diode, and the second transistor. An opening detection signal output means for outputting an opening detection signal indicating an abnormality of the network terminating device or a subscriber cable between the network terminating device and the network terminating device, and the first transistor. The saturation voltage between one end side and the other end side is smaller than the sum of the cut-off voltage between the one end side and the base of the second transistor and the forward voltage of the diode. Open circuit detection circuit.
クタであり、前記第２のトランジスタの一端側はエミッ
タであることを特徴とする請求項１に記載の局給電対応
デジタル加入者回路用開放検出回路。2. The open circuit for a digital subscriber circuit supporting station power feeding according to claim 1, wherein one end side of the first transistor is a collector and one end side of the second transistor is an emitter. Detection circuit.
カプラと、 前記ホトカプラの動作によって前記開放検出信号を出力
する開放検出信号送出端子とを備えることを特徴とする
請求項１に記載の局給電対応デジタル加入者回路用開放
検出回路。3. The open detection signal output means includes a photocoupler connected to the collector side of the second transistor, and an open detection signal transmission terminal that outputs the open detection signal by the operation of the photocoupler. The open detection circuit for digital power supply circuit corresponding to the station power supply according to claim 1.
れた網終端装置に接続され、前記網終端装置での電力の
消費状態の検出を行う局給電対応デジタル加入者回路用
開放検出回路の開放検出方法であって、 入力端子間に並列接続されるとともに、ベースが前記入
力端子の正電位側に接続された第１のトランジスタに第
１の電流を流す第１の工程と、 前記第１のトランジスタの一端側と前記入力端子の負電
位側との間に接続された抵抗に前記第１の電流を流す第
２の工程と、 前記入力端子間に並列接続されるとともに、ベースがダ
イオードを介して前記第１のトランジスタの一端側に接
続された第２のトランジスタに、前記第１の電流が減少
したとき第２の電流を流す第３の工程と、 前記第２の電流により、前記網終端装置又は前記網終端
装置との間の加入者ケーブルの異常を示す開放検出信号
を出力する第４の工程と、 前記第１のトランジスタの一端側と他端側との飽和電圧
を、前記第２のトランジスタの一端側及びベース間の遮
断電圧と前記ダイオードの順方向電圧の和より小さくす
る第５の工程とを備えることを特徴とする局給電対応デ
ジタル加入者回路用開放検出回路の開放検出方法。4. An open detection circuit for a digital subscriber circuit, which is connected to a network terminating device arranged in a subscriber's house through an outdoor transmission line and detects a power consumption state in the network terminating device. And a first step of flowing a first current through a first transistor connected in parallel between input terminals and having a base connected to a positive potential side of the input terminal, A second step of flowing the first current through a resistor connected between one end of the first transistor and the negative potential side of the input terminal; and a parallel connection between the input terminals and a base having a diode. A second step of causing a second current to flow to the second transistor connected to one end side of the first transistor via the second current when the first current decreases; Network terminator or said network terminator A fourth step of outputting an open circuit detection signal indicating an abnormality of the subscriber cable between the first and second terminals, and a saturation voltage between the one end side and the other end side of the first transistor, and the one end side of the second transistor. And a fifth step of making the cutoff voltage between the bases and the forward voltage of the diode smaller than the sum of the forward voltage of the diode and an open detection method of an open detection circuit for a digital subscriber circuit for station power supply.
ジスタのベース−コレクタ間に前記第１の電流を流す工
程が含まれ、前記第３の工程には、前記第２のトランジ
スタのエミッタ−ベース間に前記第２の電流を流す工程
が含まれることを特徴とする請求項４に記載の局給電対
応デジタル加入者回路用開放検出回路の開放検出方法。5. The first step includes the step of passing the first current between the base and collector of the first transistor, and the third step includes the step of turning on the second transistor. The open detection method for an open detection circuit for a digital subscriber circuit for station power supply according to claim 4, further comprising the step of causing the second current to flow between the emitter and the base.
トカプラによって検出する工程と、 前記検出された電流を前記開放検出信号として開放検出
信号送出端子から出力する工程とが含まれることを特徴
とする請求項４に記載の局給電対応デジタル加入者回路
用開放検出回路の開放検出方法。6. The fourth step includes the step of detecting a current flowing through the collector side of the second transistor by a photocoupler, and the detected current being output as an open detection signal from an open detection signal sending terminal. The open detection method of the open detection circuit for a digital subscriber circuit for station power feeding according to claim 4, characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11287499A JP3471656B2 (en) | 1999-04-20 | 1999-04-20 | Open circuit detecting circuit for digital subscriber circuit for office power supply and method of detecting open circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11287499A JP3471656B2 (en) | 1999-04-20 | 1999-04-20 | Open circuit detecting circuit for digital subscriber circuit for office power supply and method of detecting open circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000308102A JP2000308102A (en) | 2000-11-02 |
| JP3471656B2 true JP3471656B2 (en) | 2003-12-02 |
Family
ID=14597701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11287499A Expired - Fee Related JP3471656B2 (en) | 1999-04-20 | 1999-04-20 | Open circuit detecting circuit for digital subscriber circuit for office power supply and method of detecting open circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3471656B2 (en) |
-
1999
- 1999-04-20 JP JP11287499A patent/JP3471656B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000308102A (en) | 2000-11-02 |
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