JPH0595413A - Subscriber line test method - Google Patents
Subscriber line test methodInfo
- Publication number
- JPH0595413A JPH0595413A JP25563391A JP25563391A JPH0595413A JP H0595413 A JPH0595413 A JP H0595413A JP 25563391 A JP25563391 A JP 25563391A JP 25563391 A JP25563391 A JP 25563391A JP H0595413 A JPH0595413 A JP H0595413A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- subscriber
- line
- output
- amplifier
- 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.)
- Withdrawn
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- Monitoring And Testing Of Exchanges (AREA)
Abstract
(57)【要約】
【目的】 加入者伝送装置の遠隔端局と加入者との間の
線路を交換局から試験するための試験方式に関し、引込
み用のメタリック線や遠隔試験装置等を用いずに従来の
設備を利用することにより試験が可能な加入者線の試験
方式を提供することを目的とする。
【構成】 入／出力の電圧が等しい第１の増幅部700
と、一端が第１の増幅部700 の出力に接続される抵抗R1
とを交換機100 に設け、入／出力の電圧が等しい第２の
増幅部800 と、抵抗R1の抵抗値と等しい抵抗値を有し一
端が第２の増幅部800 の出力に接続される抵抗R2とを遠
隔端局200 に設け、抵抗R1の他端を伝送路DL1に接続
し、伝送路DL1 の他端を第２の増幅部800 の入力に接続
し、抵抗R2の他端を伝送路DL2 に接続し、伝送路DL2 の
他端を第１の増幅部700 の入力に接続し、抵抗R2の他端
に加入者線を接続し、抵抗R1の他端に試験信号を加えて
遠隔端局200 に接続した加入者線の試験を行うように構
成する。
(57) [Abstract] [Purpose] Regarding the test method for testing the line between the remote terminal station of the subscriber transmission equipment and the subscriber from the switching center, without using metallic lines for lead-in or remote test equipment. It is an object of the present invention to provide a subscriber line test method capable of testing by using conventional equipment. [Structure] First amplifier 700 having equal input / output voltages
And a resistor R1 whose one end is connected to the output of the first amplifier 700
Are provided in the exchange 100, and a second amplification section 800 having the same input / output voltage and a resistance R2 having a resistance value equal to that of the resistance R1 and one end of which is connected to the output of the second amplification section 800. Are provided in the remote terminal station 200, the other end of the resistor R1 is connected to the transmission line DL1, the other end of the transmission line DL1 is connected to the input of the second amplification section 800, and the other end of the resistor R2 is connected to the transmission line DL2. , The other end of the transmission line DL2 is connected to the input of the first amplifying unit 700, the subscriber line is connected to the other end of the resistor R2, and a test signal is applied to the other end of the resistor R1 to connect the remote terminal station. Configured to test subscriber lines connected to the 200.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、加入者伝送装置の遠隔
端局と加入者との間の線路を交換局から試験するための
試験方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test system for testing a line between a remote terminal station of a subscriber transmission device and a subscriber from a switching center.
【０００２】図４に示すように電話局の交換機１には加
入者の電話機５が接続されるとともに、ディジタル伝送
路を介して遠隔端局２が接続される。又、遠隔端局２に
は遠隔加入者の電話機６が接続される。そして、これら
電話機５、６が接続されている線路の接続並びに地絡し
ていないことの確認、電話機が正常に接続されているか
否かの確認等のために加入者線の試験が行われる。As shown in FIG. 4, a telephone set 5 of a subscriber is connected to an exchange 1 of a telephone station, and a remote terminal station 2 is connected thereto via a digital transmission line. A telephone 6 of a remote subscriber is connected to the remote terminal station 2. Then, a subscriber line test is conducted to confirm the connection of the lines to which the telephones 5 and 6 are connected, the fact that there is no ground fault, the confirmation of whether the telephones are normally connected, and the like.
【０００３】この場合、引込み用のメタリック線や遠隔
試験装置等を用いずに従来の設備を利用することにより
試験が可能な加入者線の試験方式が要望されている。In this case, there is a demand for a subscriber line test system that enables testing by utilizing conventional equipment without using a metallic line for lead-in or a remote test device.
【０００４】[0004]
【従来の技術】図４は従来例の加入者線試験方式を説明
するための図である。従来は図４に示すように、電話局
の交換機１に加入者試験装置３を接続して、交換機１に
接続された複数の電話機５の加入者線に対して予め決め
られた一定の操作手続きにより加入者試験を行ってい
た。又、交換機１にディジタル伝送路を介して遠隔端局
２が接続されているが、この遠隔端局２に接続されてい
る複数の電話機６の加入者線に対しては、遠隔端局２に
加入者試験装置４を接続してこの加入者試験装置４によ
り加入者試験を行っていた。2. Description of the Related Art FIG. 4 is a diagram for explaining a conventional subscriber line test system. Conventionally, as shown in FIG. 4, a subscriber test device 3 is connected to an exchange 1 of a central office, and a predetermined operation procedure is predetermined for subscriber lines of a plurality of telephones 5 connected to the exchange 1. Was conducting a subscriber test. Further, the remote terminal 2 is connected to the exchange 1 via a digital transmission line, but the subscriber lines of a plurality of telephones 6 connected to the remote terminal 2 are connected to the remote terminal 2. The subscriber test apparatus 4 is connected and the subscriber test is performed by the subscriber test apparatus 4.
【０００５】あるいは、交換機１と遠隔端局２との間に
メタリック線を接続して、交換機１に接続した加入者試
験装置３により、メタリック線を介して遠隔端局２に接
続された電話機６の加入者線に対して加入者試験を行っ
ていた。Alternatively, a metallic line is connected between the exchange 1 and the remote terminal 2, and the subscriber test device 3 connected to the exchange 1 allows the telephone 6 connected to the remote terminal 2 via the metallic line. Was undergoing a subscriber test for the subscriber line.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら上述の試
験方式においては、前者の場合、遠隔端局毎に試験装置
を設置するため設備及び維持コストが高くなるという問
題点があった。However, in the above-mentioned test method, the former method has a problem that the test equipment is installed for each remote terminal station, so that equipment and maintenance cost are increased.
【０００７】又、後者の場合には、交換機１と遠隔端局
２の距離が長い場合メタリック線の距離も長くなるた
め、メタリック線の抵抗、漏れ容量等により試験ができ
ないことがあるという問題点があった。In the latter case, if the distance between the exchange 1 and the remote terminal station 2 is long, the distance between the metallic wires becomes long, so that the test may not be possible due to the resistance and leakage capacity of the metallic wires. was there.
【０００８】したがって本発明の目的は、引込み用のメ
タリック線や遠隔試験装置等を用いずに従来の設備を利
用することにより試験が可能な加入者線の試験方式を提
供することにある。Therefore, it is an object of the present invention to provide a subscriber line test system capable of performing a test by utilizing conventional equipment without using a metallic line for lead-in or a remote test device.
【０００９】[0009]
【課題を解決するための手段】上記問題点は図１に示す
回路の構成によって解決される。即ち図１において、交
換機100 と、加入者線を接続する遠隔端局200 とを有
し、交換機100 と遠隔端局200 とが伝送路DL1、DL2 を
介して接続されるシステムにおいて、電流供給能力を有
し入力電圧をそのままの電圧で出力する第１の増幅部70
0 と、所定の抵抗値を有し一端が第１の増幅部700 の出
力に接続される抵抗R1とを交換機100 に設ける。The above problems can be solved by the structure of the circuit shown in FIG. That is, in FIG. 1, in a system having an exchange 100 and a remote terminal station 200 for connecting a subscriber line, and the exchange 100 and the remote terminal station 200 are connected via transmission lines DL1 and DL2, current supply capability The first amplifying section 70 which has the input voltage and outputs the input voltage as it is
The switch 100 is provided with 0 and a resistor R1 having a predetermined resistance value and one end of which is connected to the output of the first amplifying unit 700.
【００１０】又、電流供給能力を有し入力電圧をそのま
まの電圧で出力する第２の増幅部800 と、抵抗R1の抵抗
値と等しい抵抗値を有し一端が第２の増幅部800 の出力
に接続される抵抗R2とを遠隔端局200 に設ける。A second amplifier 800 having a current supply capability and outputting the input voltage as it is, and a second amplifier 800 having a resistance value equal to the resistance value of the resistor R1 and an output from the second amplifier 800 at one end A resistor R2 connected to the remote terminal station 200 is provided.
【００１１】そして、第１の増幅部700 の出力に接続し
た抵抗R1の他端を伝送路DL1 に接続し、伝送路DL1の他
端を第２の増幅部800 の入力に接続する。又、第２の増
幅部800 の出力に接続した抵抗R2の他端を伝送路DL2 に
接続し、伝送路DL2 の他端を第１の増幅部700 の入力に
接続する。Then, the other end of the resistor R1 connected to the output of the first amplifier 700 is connected to the transmission line DL1, and the other end of the transmission line DL1 is connected to the input of the second amplifier 800. Further, the other end of the resistor R2 connected to the output of the second amplification section 800 is connected to the transmission line DL2, and the other end of the transmission line DL2 is connected to the input of the first amplification section 700.
【００１２】そして、第２の増幅部800 の出力に接続し
た抵抗R2の他端に加入者線を接続し、第１の増幅部700
の出力に接続した抵抗R1の他端に試験信号を加えること
により、遠隔端局200 に接続した加入者線の試験を行
う。Then, a subscriber line is connected to the other end of the resistor R2 connected to the output of the second amplifying section 800, and the first amplifying section 700 is connected.
The subscriber line connected to the remote terminal station 200 is tested by applying a test signal to the other end of the resistor R1 connected to the output of.
【００１３】[0013]
【作用】図１において、第１の増幅部700 の出力に接続
した抵抗R1の他端をａ、ａ点の電圧をＶ1 、第２の増幅
部800 の出力に接続した抵抗R2の他端をｂ、ｂ点の電圧
をＶ2 、又、第１の増幅部700 の出力に接続した抵抗R1
に流れる電流をＩ1 、第２の増幅部800 の出力に接続し
た抵抗R2に流れる電流をＩ2 、第１の増幅部700、第２
の増幅部800の出力電圧をＶ01、Ｖ02とすると、 Ｉ1 ＝（Ｖ1 −Ｖ01）／R1、Ｉ2 ＝（Ｖ2 −Ｖ02）／R
2、Ｖ01＝Ｖ2 、Ｖ02＝Ｖ1 である。[Action] In FIG. 1, the other end of the first a the other end of the resistor R1 connected to the output of the amplifier 700, V 1 the voltage at point a, resistors connected to the output of the second amplifying unit 800 R2 Is the voltage at the point b, V 2 is the voltage at the point b, and the resistor R1 is connected to the output of the first amplifier 700.
The current flowing through the I 1, I 2 the current flowing through the resistor R2 connected to the output of the second amplifying unit 800, a first amplifying unit 700, a second
If the output voltage of the amplifying unit 800 is V 01 , V 02 , then I 1 = (V 1 −V 01 ) / R 1 , I 2 = (V 2 −V 02 ) / R
2, V 01 = V 2 and V 02 = V 1 .
【００１４】この結果、 Ｉ1 ＝（Ｖ1 −Ｖ2)／R1、Ｉ2＝（Ｖ2 −Ｖ1)／R2、こ
こで、R1＝R2＝Ｒとすると、Ｉ1 ＝−Ｉ2 となる。As a result, I 1 = (V 1 -V 2 ) / R 1 , I 2 = (V 2 -V 1 ) / R 2, where R 1 = R 2 = R, I 1 = -I 2 Become.
【００１５】故に、（Ｖ1 −Ｖ2)／Ｒ＝Ｉ1 ＝−Ｉ2 が
得られる。即ち、交換機100と遠隔端局200の間の距離に
関係なく、ａ点及びｂ点の電圧値がそれぞれ対向する第
２及び第１の増幅部800 及び700に伝えられれば、点ａ
と点ｂの間は所定の抵抗値を有する抵抗Ｒの線と見なす
ことができる。Therefore, (V 1 -V 2 ) / R = I 1 = -I 2 is obtained. That is, regardless of the distance between the exchange 100 and the remote terminal station 200, if the voltage values at the points a and b are transmitted to the opposing second and first amplifying units 800 and 700, respectively, the point a
The line between the point b and the point b can be regarded as a line of the resistance R having a predetermined resistance value.
【００１６】このため、この抵抗Ｒの抵抗値を低い一定
値に設定することにより、ａ点とｂ点を直接ケーブル
（導体）で接続した場合に問題となる距離によるケーブ
ル抵抗の増減、及び漏れ容量の影響を解決することがで
きる。Therefore, by setting the resistance value of the resistance R to a low constant value, the increase or decrease of the cable resistance and the leakage depending on the distance which becomes a problem when the points a and b are directly connected by the cable (conductor). The effect of capacity can be resolved.
【００１７】この結果、引込み用のメタリック線や遠隔
試験装置等を用いずに従来の設備を利用することによ
り、交換機100側から遠隔端局200 に接続した加入者線
の試験を行うことが可能となる。As a result, it is possible to test the subscriber line connected to the remote terminal station 200 from the exchange 100 side by using conventional equipment without using a metallic line for lead-in or a remote test device. Becomes
【００１８】[0018]
【実施例】図２は本発明の実施例の回路図（その１）で
ある。図３は本発明の実施例の回路図（その２）であ
る。2 is a circuit diagram (1) of an embodiment of the present invention. FIG. 3 is a circuit diagram (2) of the embodiment of the present invention.
【００１９】全図を通じて同一符号は同一対象物を示
す。図２は本発明の動作を説明するための回路図であ
り、同図（Ａ）はアンプ７を含む回路とアンプ８を含
む回路をディジタル伝送路により接続した回路を示し
ている。同図（Ａ）のアンプ７、８は、＋入力端子に印
加された電圧をそのままの電圧で電流供給能力を増して
出力するボルテージホロア・アンプである。Ｒ 1 、Ｒ2
は任意の純抵抗であり、ＶB1〜ＶB4はアンプ７、８に電
力を供給する電圧源である。Throughout the drawings, the same reference numerals denote the same objects.
You FIG. 2 is a circuit diagram for explaining the operation of the present invention.
FIG. 1A includes a circuit including the amplifier 7 and the amplifier 8.
Shows the circuit in which the
ing. The amplifiers 7 and 8 in FIG.
Increase the current supply capacity with the applied voltage as it is
It is a voltage follower amplifier that outputs. R 1, R2
Is an arbitrary pure resistance, VB1~ VB4Powers amplifiers 7 and 8
A voltage source that supplies power.
【００２０】同図（Ａ）において、ａ、ｂの両側に任意
の回路が接続されたと仮定する。今、ａ点の電圧を
Ｖ1 、ｂ点の電圧をＶ2 、又、抵抗Ｒ1 、Ｒ2 に流れる
電流をＩ 1 、Ｉ2 、アンプ７、アンプ８の出力電圧をＶ
01、Ｖ02とすると、 Ｉ1 ＝（Ｖ1 −Ｖ01）／Ｒ1 、Ｉ2 ＝（Ｖ2 −Ｖ02）／
Ｒ2 、Ｖ01＝Ｖ2 、Ｖ02＝Ｖ1 である。In FIG. 1A, both sides of a and b are optional.
It is assumed that the circuit of is connected. Now, change the voltage at point a
V1, The voltage at point b is V2, Resistance R1, R2Flowing into
Current I 1, I2, Output voltage of amplifier 7 and amplifier 8 to V
01, V02Then, I1= (V1-V01) / R1, I2= (V2-V02) /
R2, V01= V2, V02= V1Is.
【００２１】この結果、 Ｉ1 ＝（Ｖ1 −Ｖ2)／Ｒ1 、Ｉ2 ＝（Ｖ2 −Ｖ1)／Ｒ2
ここで、Ｒ1 ＝Ｒ2 ＝Ｒとすると、Ｉ1 ＝−Ｉ2とな
る。As a result, I 1 = (V 1 -V 2 ) / R 1 and I 2 = (V 2 -V 1 ) / R 2
If R 1 = R 2 = R, then I 1 = −I 2 .
【００２２】故に、（Ｖ1 −Ｖ2)／Ｒ＝Ｉ1 ＝−Ｉ2 が
得られる。このことは、図２（Ａ）に示す回路が同図
（Ｂ）に示す回路と等価であることを示している。即
ち、アンプ７とアンプ８の間の距離に関係なく抵抗Ｒ1
とＲ2 の外側の電圧値が反対側のアンプ回路に伝えられ
れば、点ａと点ｂの間は図２（Ｂ）に示すように固定抵
抗Ｒの線と見なすことができる。Therefore, (V 1 -V 2 ) / R = I 1 = -I 2 is obtained. This indicates that the circuit shown in FIG. 2A is equivalent to the circuit shown in FIG. That is, regardless of the distance between the amplifier 7 and the amplifier 8, the resistance R 1
If the voltage value outside R and R 2 is transmitted to the amplifier circuit on the opposite side, it can be considered that the line between the points a and b is the line of the fixed resistance R as shown in FIG. 2B.
【００２３】これはａ点とｂ点を直接ケーブル（導体）
で接続した場合に問題となる距離によるケーブル抵抗の
増減、及び漏れ容量の影響を解決することができる。
又、本回路では、アンプ７とアンプ８の間に電圧値とい
うスカラー量の伝達経路を与える必要がある。電圧値と
いうアナログ量を誤差を少なくして長距離伝送する方式
として、アナログ／ディジタル変換（以下Ａ／Ｄ変換と
称する）を用いたディジタル中継方式がある。図２に示
す回路方式を実用化するためにディジタル中継路と結合
させたのが図３である。This is a cable (conductor) directly connecting points a and b.
It is possible to solve the increase and decrease of the cable resistance due to the distance and the influence of the leakage capacity, which are problematic in the case of connection with.
Further, in this circuit, it is necessary to provide a transmission path of a scalar quantity called a voltage value between the amplifier 7 and the amplifier 8. There is a digital relay system using analog / digital conversion (hereinafter referred to as A / D conversion) as a system for long-distance transmission of an analog amount called a voltage value with a small error. In order to put the circuit system shown in FIG. 2 into practical use, it is combined with a digital relay line as shown in FIG.
【００２４】即ち図３において、回路’のアンプ７の
出力の抵抗Ｒ端子とディジタル伝送路の間、及び回路
’のアンプ８の出力の抵抗Ｒ端子とディジタル伝送路
の間にアナログ／ディジタル変換回路（以下Ａ／Ｄと称
する）９及び11を接続する。又、回路’のアンプ７の
＋入力端子とディジタル伝送路の間、及び回路’のア
ンプ８の＋入力端子とディジタル伝送路の間にディジタ
ル／アナログ変換回路（以下Ｄ／Ａと称する）10及び12
を接続する。尚、上記Ａ／Ｄ９、11及びＤ／Ａ10、12
は、例えばＩＣ技術により作ることができる。That is, in FIG. 3, an analog / digital conversion circuit is provided between the resistance R terminal of the output of the amplifier 7 of the circuit 'and the digital transmission path, and between the resistance R terminal of the output of the amplifier 8 of the circuit' and the digital transmission path. 9 and 11 (hereinafter referred to as A / D) are connected. A digital / analog conversion circuit (hereinafter referred to as D / A) 10 is provided between the + input terminal of the amplifier 7 of the circuit 'and the digital transmission line, and between the + input terminal of the amplifier 8 of the circuit' and the digital transmission line. 12
Connect. Incidentally, the above A / D 9, 11 and D / A 10, 12
Can be made, for example, by IC technology.
【００２５】そして、例えば回路’を図４に示す電話
局の交換機１内又は交換機１の周辺に設け、回路’を
遠隔端局２内又は遠隔端局２の周辺に設ける。そして、
図３に示す回路’のａ点に図４に示す加入者試験装置
３を接続し、回路’のｂ点に、図４に示す遠隔端局装
置２に接続される加入者線と電話機６を遠隔スイッチ
（図示しない）により切替え接続する。そして、回路
’と回路’の間を例えばスペアのディジタル伝送路
で接続する。Then, for example, a circuit 'is provided in or around the exchange 1 of the telephone station shown in FIG. 4, and a circuit' is provided in the remote terminal 2 or around the remote terminal 2. And
The subscriber's test equipment 3 shown in FIG. 4 is connected to point a of the circuit 'shown in FIG. 3, and the subscriber line and telephone 6 connected to the remote terminal device 2 shown in FIG. 4 are connected to point b of the circuit'. It is switched and connected by a remote switch (not shown). Then, the circuit 'and the circuit' are connected by, for example, a spare digital transmission line.
【００２６】尚、加入者試験用引込み線は通常野加入者
線路のＡ線、Ｂ線に対応したペア線で構成されている
が、上述した図３に示す回路をＡ線、Ｂ線用に２系統準
備することにより、このペア線を抵抗Ｒでそれぞれ接続
したのと等価になる。The subscriber test service line is usually composed of a pair of lines corresponding to the A and B lines of the subscriber line, but the circuit shown in FIG. 3 is used for the A and B lines. By preparing two systems, it becomes equivalent to connecting the pair wires with the resistors R respectively.
【００２７】そして、遠隔端局２に接続されている複数
の電話機６の加入者線に対して、上記加入者試験装置３
から回路’、ディジタル伝送路及び回路’を介して
試験信号を送り加入者試験を行う。Then, for the subscriber lines of the plurality of telephones 6 connected to the remote terminal station 2, the subscriber testing device 3 is connected.
Perform a subscriber test by sending a test signal from the circuit through the circuit ', the digital transmission line and the circuit'.
【００２８】この結果、引込み用のメタリック線や遠隔
試験装置等を用いずに従来の設備を利用することにより
加入者線の試験が可能となる。As a result, the subscriber line can be tested by using the conventional equipment without using the metallic line for lead-in or the remote test device.
【００２９】[0029]
【発明の効果】以上説明したように本発明によれば、引
込み用のメタリック線や遠隔試験装置等を用いずに従来
の設備を利用することにより加入者線の試験が可能とな
る。As described above, according to the present invention, it is possible to test a subscriber line by using conventional equipment without using a metallic line for lead-in or a remote test device.
【図１】は本発明の原理図、FIG. 1 is a principle diagram of the present invention,
【図２】は本発明の実施例の回路図（その１）、FIG. 2 is a circuit diagram (part 1) of an embodiment of the present invention,
【図３】は本発明の実施例の回路図（その２）、FIG. 3 is a circuit diagram (part 2) of an embodiment of the present invention,
【図４】は従来例の加入者線試験方式を説明するための
図である。FIG. 4 is a diagram for explaining a conventional subscriber line test system.
700 は第１の増幅部、800 は第２の増幅部、R1、R2は抵
抗、DL1 、DL2 は伝送路を示す。700 is the first amplification section, 800 is the second amplification section, R1 and R2 are resistors, and DL1 and DL2 are transmission lines.
Claims (1)
隔端局(200) とを有し、該交換機(100) と該遠隔端局(2
00) とが伝送路(DL1、DL2)を介して接続されるシステム
において、 電流供給能力を有し入力電圧をそのままの電圧で出力す
る第１の増幅部(700)と、所定の抵抗値を有し一端が該
第１の増幅部(700) の出力に接続される抵抗(R1)とを該
交換機(100) に設け、 電流供給能力を有し入力電圧をそのままの電圧で出力す
る第２の増幅部(800)と、該抵抗(R1)の抵抗値と等しい
抵抗値を有し一端が該第２の増幅部(800) の出力に接続
される抵抗(R2)とを該遠隔端局(200) に設け、 該第１の増幅部(700) の出力に接続した抵抗(R1)の他端
を該伝送路(DL1)に接続し、該伝送路(DL1)の他端を該第
２の増幅部(800) の入力に接続し、 該第２の増幅部(800) の出力に接続した抵抗(R2)の他端
を該伝送路(DL2)に接続し、該伝送路(DL2)の他端を該第
１の増幅部(700) の入力に接続し、 該第２の増幅部(800) の出力に接続した抵抗(R2)の他端
に該加入者線を接続し、 該第１の増幅部(700) の出力に接続した抵抗(R1)の他端
に試験信号を加えて該遠隔端局(200) に接続した加入者
線の試験を行うようにしたことを特徴とする加入者線の
試験方式。1. A switchboard (100) and a remote terminal station (200) for connecting a subscriber line, the switchboard (100) and the remote terminal station (2).
00) is connected via transmission lines (DL1, DL2) to a first amplifier (700) that has current supply capability and outputs the input voltage as it is, and a predetermined resistance value The switch (100) is provided with a resistor (R1) whose one end is connected to the output of the first amplifying unit (700), and which has a current supply capability and outputs the input voltage as it is Of the amplifier (800) and a resistor (R2) having a resistance value equal to that of the resistor (R1) and one end of which is connected to the output of the second amplifier (800). (200), the other end of the resistor (R1) connected to the output of the first amplification section (700) is connected to the transmission line (DL1), and the other end of the transmission line (DL1) is connected to the first line. The other end of the resistor (R2) connected to the input of the second amplifying unit (800) and connected to the output of the second amplifying unit (800) is connected to the transmission line (DL2). ) Is connected to the input of the first amplifying section (700), and the second amplifying section (80 The subscriber line is connected to the other end of the resistor (R2) connected to the output of (0), and a test signal is applied to the other end of the resistor (R1) connected to the output of the first amplifying unit (700). A test method of a subscriber line connected to the remote terminal station (200) is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25563391A JPH0595413A (en) | 1991-10-03 | 1991-10-03 | Subscriber line test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25563391A JPH0595413A (en) | 1991-10-03 | 1991-10-03 | Subscriber line test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0595413A true JPH0595413A (en) | 1993-04-16 |
Family
ID=17281463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25563391A Withdrawn JPH0595413A (en) | 1991-10-03 | 1991-10-03 | Subscriber line test method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0595413A (en) |
-
1991
- 1991-10-03 JP JP25563391A patent/JPH0595413A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990107 |