JPH03289747A - Line quality measuring machine - Google Patents
Line quality measuring machineInfo
- Publication number
- JPH03289747A JPH03289747A JP9023090A JP9023090A JPH03289747A JP H03289747 A JPH03289747 A JP H03289747A JP 9023090 A JP9023090 A JP 9023090A JP 9023090 A JP9023090 A JP 9023090A JP H03289747 A JPH03289747 A JP H03289747A
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- JP
- Japan
- Prior art keywords
- data
- circuit
- control circuit
- line
- 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
Links
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 41
- 230000002950 deficient Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 17
- 238000004891 communication Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000012549 training Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Monitoring And Testing Of Exchanges (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、一般加入者電話回線の品質を測定する回線品
質測定機に関する。特に相手機までの接続経路が多種有
る場合、障害回線の特定のために使用するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a line quality measuring device for measuring the quality of a general subscriber's telephone line. This is used to identify faulty lines, especially when there are many different connection routes to the other party's device.
近年、業務の情報化が進み、FAXやパソコン通信が増
加するに従い、電話を使用しているだけでは気にならな
かった種々の障害が問題となってきた0例えば、特定の
相手にのみFAXができないとか、何回かに一回パソコ
ン通信ができないといった障害がある。これは、電話の
使用に際してはさほど問題とならなかった回線の瞬断や
インパルス雑音が、FAXやパソコン通信等のデータ通
信にとっては致命的な障害となる。そのためFAXの黒
白信号や、パソコンのテキストデータを正しく伝送でき
ない。In recent years, as work has become more computerized and the use of faxes and computer communications has increased, various problems that were not a problem when using the telephone have become a problem. There are problems such as not being able to communicate with the computer or not being able to communicate with the computer every few times. This means that instantaneous line interruptions and impulse noise, which do not pose much of a problem when using a telephone, become fatal obstacles to data communications such as FAX and personal computer communications. As a result, black and white fax signals and PC text data cannot be transmitted correctly.
そのためFAXにおいては、回線エラー率測定機能を有
する装W(特開昭60−81962号広報)や、電話回
線のS/N比応じて通信速度を機能を有する装置(特開
昭61−218269号広報)が開示されているが、通
信の使命はデータを確実に、より速く、より正確に伝送
することであり、根本的な電話回線の障害の解決にはな
らない。Therefore, for FAX, there is a device W that has a line error rate measurement function (Japanese Patent Application Laid-Open No. 60-81962), and a device that has a function to adjust the communication speed according to the S/N ratio of the telephone line (Japanese Patent Laid-Open No. 61-218269). Although the mission of telecommunications is to transmit data reliably, faster, and more accurately, it does not solve the fundamental problem of telephone lines.
そこで、従来の電話網を使用してデータ通信を行う場合
は、端末装置を設置する前に予め電話回線の伝送特性を
測定し、電話回線がデータ通信に耐えうるか否かを確認
する必要がある。また、運用中の電話回線に障害がたび
たび発生する場合には、障害発生箇所を特定し、早急に
修理する必要がある。Therefore, when performing data communication using a conventional telephone network, it is necessary to measure the transmission characteristics of the telephone line in advance and confirm whether the telephone line can withstand data communication before installing the terminal equipment. . In addition, if failures occur frequently in telephone lines in operation, it is necessary to identify the location of the failure and repair it immediately.
そのために必要な測定項目を以下に示す。The measurement items necessary for this purpose are shown below.
■信号レベル、■白色雑音、■S/N比、■減衰歪み、
群遅延歪み、■総合歪み、■位相ジッタ、■瞬断、■イ
ンパルス雑音、■送話者エコー、受話者エコー、[相]
誤り率、■接続特性。■Signal level, ■White noise, ■S/N ratio, ■Attenuation distortion,
Group delay distortion, ■Total distortion, ■Phase jitter, ■Momentary interruption, ■Impulse noise, ■Speaker echo, receiver echo, [phase]
error rate, ■ connection characteristics.
そのため従来では、第9図に示すような機器構成で電話
回線の伝送特性を測定していた。Therefore, conventionally, the transmission characteristics of a telephone line have been measured using an equipment configuration as shown in FIG.
つまり、被測定回線の端末側と交換機室の電話回線にそ
れぞれ一般の電話機と測定器を切換器を介して接続する
。また、切換器と測定器との間に、電話回線の直流をカ
ットするアダプタが必要となる6通常、アダプタはコイ
ルとコンデンサで構成され、その定数は、電話回線の特
性とマツチングするように設定する必要がある。That is, a general telephone and a measuring device are connected to the terminal side of the line to be measured and the telephone line in the exchange room, respectively, via a switching device. Additionally, an adapter that cuts the direct current of the telephone line is required between the switching device and the measuring device.6 Usually, the adapter consists of a coil and a capacitor, and its constants are set to match the characteristics of the telephone line. There is a need to.
測定をする場合、端末側の電話機から交換機室の電話機
を呼び出し、保守担当者どうし打合せを行った後、それ
ぞれの切換器を測定器側に倒し、交換機室側と端末側か
ら交互に測定信号を出し合い、被測定回線の伝送特性を
測定する。さらに、測定結果は所定の用紙に記入する。When making measurements, call the telephone in the exchange room from the telephone on the terminal side, and after a discussion between maintenance personnel, each switch is turned to the measuring instrument side, and measurement signals are sent alternately from the exchange room side and the terminal side. and measure the transmission characteristics of the line under test. Furthermore, the measurement results are written on a prescribed form.
しかし、従来の方法だと端末側と交換機室にそれぞれ保
守担当者が必要で、かつ各測定項目毎に別々の測定器が
必要となる。そのため保守担当者は各種の測定器に精通
している必要がある。However, conventional methods require maintenance personnel at the terminal side and in the switching room, and separate measuring instruments are required for each measurement item. Therefore, maintenance personnel must be familiar with various measuring instruments.
また、特定の端末を呼び出すと何回かに一回の割合で障
害に遭遇するとか、時間帯によって障害が頻発するよう
な、ある中継回線に問題がある場合がある。この障害を
特定するためには、障害回線を発見するまで、片方の端
末側から他方に人海戦術で電話をかけまくる必要がある
。また、中継回線が多数ある場合は、深夜のトラフィク
量の少ない時間帯で、出トランクを閉塞し、中継回線を
絞り込むことにより、障害回線を特定していく必要があ
った。Furthermore, there may be a problem with a certain relay line, such as a problem occurring once every few times when calling a specific terminal, or a problem occurring frequently depending on the time of day. In order to identify this fault, it is necessary to make a series of calls from one terminal to the other until the faulty line is discovered. Additionally, if there are a large number of trunk lines, it is necessary to block the outgoing trunks and narrow down the number of relay lines in the middle of the night, when traffic volume is low, in order to identify the faulty line.
本発明は、このような事情に鑑みてなされたものであり
、端末側と交換機室側に接続するだけで、障害回線の探
索を容易に行うことができる回線品質測定機を提供する
ことを!I題とする。The present invention has been made in view of these circumstances, and it is an object of the present invention to provide a line quality measuring device that can easily search for faulty lines by simply connecting it to the terminal side and the exchange room side. This will be the I topic.
上記課題を解決するために本発明の回線品質測定機にお
いては、
■相手機と接続するための制御をする網制御回路と、
■テスト信号及び制御信号の送信データを変調し送出す
るデータ発生回路と、
■変調された送信データと相手機からの変調された受信
データを分岐する分岐回路と、
■受信データを復調し検出するデータ検出回路と、■網
制御回路とデータ発生回路とデータ検出回路とを制御し
、データ検出回路の出力データを判定する制御回路と、
■測定項目、相手機側電話番号、測定条件を記憶する記
憶回路とを備えた。In order to solve the above problems, the line quality measuring device of the present invention includes: (1) a network control circuit that controls connection with a partner device; and (2) a data generation circuit that modulates and sends out transmission data of test signals and control signals. ■A branch circuit that branches the modulated transmission data and the modulated reception data from the other party's device, ■A data detection circuit that demodulates and detects the reception data, ■A network control circuit, a data generation circuit, and a data detection circuit. and (2) a memory circuit that stores measurement items, the telephone number of the other party, and measurement conditions.
このように構成された回線品質測定機によれば、測定前
に相手機側と電話で打合せすることがなく、また、測定
項目毎に、測定器を交換する必要がない。さらに、任意
の時間に任意の相手機までの電話回線の特性を測定でき
る。According to the line quality measuring device configured in this way, there is no need to discuss with the other party's device over the phone before measurement, and there is no need to replace the measuring device for each measurement item. Furthermore, the characteristics of the telephone line to any destination can be measured at any time.
以下本発明の一実施例を図面を用いて説明する。 An embodiment of the present invention will be described below with reference to the drawings.
(第一の実施例)
第1図は本発明の回線品質測定機の第一の実施例の回路
図、第2図は本発明の回線品質測定機を発信側、着信側
に使用したシステム構成図、第3図は自動測定シーケン
スを示した図である。データ発生回路1をROM (R
ead 0nly Me+noly) 、DS P (
Degital Signal Processor)
とD/A変換器(Degttal/Analog変換器
)で構成する。同様にして、データ検出回路2をROM
、DSPとA/D変換器(Analog/Degita
l変換器)で構成する。(First Embodiment) Fig. 1 is a circuit diagram of the first embodiment of the line quality measuring device of the present invention, and Fig. 2 is a system configuration using the line quality measuring device of the present invention on the calling side and the receiving side. FIG. 3 is a diagram showing an automatic measurement sequence. The data generation circuit 1 is ROM (R
ead 0nly Me+noly), DS P (
Digital Signal Processor)
and a D/A converter (Degttal/Analog converter). Similarly, the data detection circuit 2 is
, DSP and A/D converter (Analog/Digital
1 converter).
具体的に説明すると、発信側の装置内の記憶回路3に記
憶されている測定条件(測定開始時刻)、相手機側電話
番号にしたがって、制御回路4が網制御回路5を制御す
る。網制御回路5は、オフフックし交換機からのD T
(Dial Tone )受信後、相手機の電話番号
をダイヤルする0着信側の交換機が相手機に対して転極
し呼び出し音を送信する。Specifically, the control circuit 4 controls the network control circuit 5 in accordance with the measurement conditions (measurement start time) and the telephone number of the other party's device stored in the storage circuit 3 in the device on the calling side. The network control circuit 5 goes off-hook and receives D T from the exchange.
(Dial Tone) After receiving the call, the telephone number of the other party is dialed.The exchange on the receiving side changes the polarity and sends a ring tone to the other party.
相手機はオフフックし、導通トーン1を送信する。The other party goes off-hook and transmits continuity tone 1.
データ検出回Ni2は、導通トーン1を受信後、データ
発生回路1は相手機に対して導通トーン2を送信する。In the data detection circuit Ni2, after receiving the conduction tone 1, the data generation circuit 1 transmits the conduction tone 2 to the other party's device.
その後、交換機は発信側の装置に対して転極する(第3
図(a))、次に、測定シーケンスに入る。相手機がモ
デモトレーニング信号を送信し、その信号に対して発信
側の装置は、応答トーンと、モデモトレーニング信号を
送信を送出する。それに対して相手機が応答トーンを送
出し、各種の測定に入る(第3図(b))。The exchange then reverses polarity (third
Figure (a)), then a measurement sequence is entered. The other party's device transmits a modemo training signal, and in response to the signal, the transmitting device sends a response tone and a modemo training signal. In response, the other party sends a response tone and begins various measurements (FIG. 3(b)).
なお、第1のROM1aから導通トーン、応答トーンを
、第2のROM1bからモデモトレーニング信号をDS
Ple、D/A変換器1dを介して送出される。Note that the conduction tone and response tone are transmitted from the first ROM 1a, and the modem training signal is transmitted from the second ROM 1b.
Ple and is sent out via the D/A converter 1d.
また、各種の測定においては、第3図(c)に示すよう
に第1のROM1aから各種測定トーンを、第2のRO
M1bから制御信号である測定パラメータや、印字デー
タ、相手機が送出する測定結果等、また、第3のROM
1cから疑似ランダムパターン信号(以下、PNパター
ン信号という、)をDSPie、D/A変換器1dを介
して送出される。 受信信号は、A/D変換器2dでデ
ジタル信号に変換され、各種トーンは第4のROM2a
で、測定パラメータや、印字データ、相手機が送出する
測定結果等、は第5のROM2bで、PNパターン信号
は第6のROM2cでDSP2eにより復調される。そ
の復調データは、制御回路4により判定され記憶図N3
に記憶されている内容により処理される。In addition, in various measurements, various measurement tones are transferred from the first ROM 1a to the second ROM 1a as shown in FIG. 3(c).
Measurement parameters that are control signals, print data, measurement results sent by the partner machine, etc. from M1b, and the third ROM
A pseudo-random pattern signal (hereinafter referred to as a PN pattern signal) is sent from 1c via DSPie and D/A converter 1d. The received signal is converted into a digital signal by the A/D converter 2d, and various tones are stored in the fourth ROM 2a.
The measurement parameters, print data, measurement results sent by the partner machine, etc. are demodulated in the fifth ROM 2b, and the PN pattern signal is demodulated in the sixth ROM 2c by the DSP 2e. The demodulated data is determined by the control circuit 4 and stored in the memory diagram N3.
Processing is performed according to the contents stored in the .
つまり、第3図のシーケンスのように信号の送受信をお
こなう、また、測定結果に応じて次に測定する項目を選
択する。That is, signals are transmitted and received as in the sequence shown in FIG. 3, and the next item to be measured is selected depending on the measurement result.
また、それぞれのROMの切り替えはDSPIeおよび
D S P 2eにより行ってもよく、また単にアドレ
スの指定によっても可能である。Furthermore, switching between the respective ROMs may be performed using DSPIe and DSP2e, or simply by specifying an address.
なお、第2のROM1b、第3のROM1cはそれぞれ
変調された信号が記憶されている。同様に、第5のRO
M2b、第6のROM2cはそれぞれ復調された信号が
記憶されている。しかし、この実施例に限らず変調器、
復調器を備えることにより、それぞれのROMは、変調
および復調していない信号を記憶することに、本発明を
実施できることはいうまでもない。Note that the second ROM 1b and the third ROM 1c each store a modulated signal. Similarly, the fifth RO
Demodulated signals are stored in M2b and the sixth ROM2c, respectively. However, the modulator is not limited to this embodiment,
It goes without saying that by providing a demodulator, each ROM can implement the present invention in storing modulated and undemodulated signals.
第4図は、回線品質測定機が障害回線を保留した状態を
示した図である0回線品質測定機は指定した任意の時間
帯に測定を繰り返し実行できるので、夜間に測定すると
か、障害発生確率の高い時間帯に測定を実行することが
できる。Figure 4 is a diagram showing the state in which the line quality measurement device holds a faulty line.0The line quality measurement device can repeatedly perform measurements at any specified time, so it is possible to measure at night or when a fault occurs. Measurements can be performed during time periods with high probability.
測定動作は、障害回線を検出すると、該当回線をそのま
ま保留し、特定のトーンを送出し続ける。In the measurement operation, when a faulty line is detected, the line is put on hold and a specific tone continues to be sent.
保守担当者がそのトーンを追跡すれば障害箇所を特定で
きる。また、障害回線保留中に手動測定に切り替え、伝
送特性をさらに詳しく測定できる。If maintenance personnel track the tone, they can pinpoint the location of the problem. You can also switch to manual measurement while a faulty line is on hold to measure transmission characteristics in more detail.
(第二の実施例)
第5図は本発明の回線品質測定機の第二の実施例の回路
図である。データ発生回路1をPNパターン発生器2f
、 S I O(Serial Input 0utp
ut InterfaceNg、変調器1h、トーン発
振器1量とで構成する。また、制御信号である測定パラ
メータや、印字データ、相手機が送出する測定結果等は
制御回路4からSl01gを経由し、変調器1hにより
送出される。さらに、各種トーンはトーン発振器口によ
り送出される。(Second Embodiment) FIG. 5 is a circuit diagram of a second embodiment of the line quality measuring device of the present invention. The data generation circuit 1 is converted into a PN pattern generator 2f.
, SIO(Serial Input 0utp
It consists of a ut InterfaceNg, a modulator 1h, and a tone oscillator. Furthermore, measurement parameters that are control signals, print data, measurement results sent by the partner machine, etc. are sent from the control circuit 4 via Sl01g and by the modulator 1h. Additionally, various tones are emitted by tone oscillator ports.
同様にして、データ検出回路2をエーラ検出器2f、
S I 02gと復調器2h1トーン受信器21とで構
成する。また、制御信号である測定パラメータや、印字
データ、相手機が送出する測定結果等は復調器2fで復
調されSl02gを経由して制御回路4で判定される。Similarly, the data detection circuit 2 is connected to an error detector 2f,
It consists of an S I 02g, a demodulator 2h1 tone receiver 21. Furthermore, measurement parameters that are control signals, print data, measurement results sent by the other party's machine, etc. are demodulated by the demodulator 2f and determined by the control circuit 4 via Sl02g.
さらに、各種トーンはトーン受信器2蚤により受信され
る。Additionally, the various tones are received by two tone receivers.
その他の動作およびシーケンスは第一の実施例と同様で
ある。Other operations and sequences are the same as in the first embodiment.
また、PNパターン発生器2fとSl01gの切り替え
、および変調器1hとトーン発振器11の切り替えは制
御回路4がおこなう、同様にして、エーラ検出器2fと
Sl02gの切り替え、および復調器2hとトーン受信
器21の切り替えは制御回路4がおこなう。Furthermore, the control circuit 4 switches between the PN pattern generator 2f and Sl01g, and between the modulator 1h and the tone oscillator 11.Similarly, the control circuit 4 switches between the error detector 2f and Sl02g, and between the demodulator 2h and the tone receiver. The switching of 21 is performed by the control circuit 4.
(第三の実施例)
第6図は本発明の回線品質測定機を発信側、着信側に複
数第使用したシステム構成図である。(Third Embodiment) FIG. 6 is a system configuration diagram in which a plurality of line quality measuring devices of the present invention are used on the originating side and the receiving side.
予め設定した時間に、発信側Aから着信側Bを選択し、
A−B間の回線を自動測定する。A−B間の自動測定終
了後、次に発信側Aから着信側Cを選択し、A−C間の
回線を自動測定する。以後、同様にしてA−D、・・・
A−Uを測定する。さらに、A−A、・・・A−Uと繰
り返し測定することもできる。At a preset time, the calling party A selects the called party B, and
Automatically measure the line between A and B. After the automatic measurement between A and B is completed, next, the calling side A selects the called side C, and the line between A and C is automatically measured. Thereafter, in the same way A-D,...
Measure A-U. Furthermore, it is also possible to repeatedly measure AA, . . . AU.
なお、測定中に回ms害があった場合、該当の障害回線
を保留するか、該当の障害回線を飛ばして次の回線を測
定するかは選択できる。In addition, if there is a link failure during measurement, it is possible to select whether to hold the relevant faulty line or to skip the relevant faulty line and measure the next line.
(第四の実施例)
第一の実施例乃至第三の実施例では、発信側、着信側共
本発明の回線品質測定機を使用した。(Fourth Embodiment) In the first to third embodiments, the line quality measuring device of the present invention was used on both the calling and receiving sides.
それに対して、第7図に示す第四の実施例は発信側を電
話機、着信側を本発明の回線品質測定機を使用したもの
である。また、第8図にその試験試験シーケンスを示す
。これは、簡易通話試験による片方向の試験を行うもの
である。を詰機から着信側の回線品質測定機を呼び出す
ことにより、基準信号を聴取し、音量の大小から通話レ
ベル等を確認する。On the other hand, the fourth embodiment shown in FIG. 7 uses a telephone on the calling side and a line quality measuring device of the present invention on the called side. Moreover, FIG. 8 shows the test test sequence. This is a one-way test using a simple call test. By calling the line quality measurement device on the receiving side from the filling machine, the standard signal is listened to and the call level etc. can be checked from the volume level.
以上説明したように本発明の回線品質測定機は、相手機
と接続するための制御をする網制御回路と、テスト信号
及び制御信号の送信データを変調し出力するデータ発生
回路と1、変調された送信データと相手機からの変調さ
れた受信データを分岐する分岐回路と、受信データを復
調し検出するデータ検出回路と、網制御回路とデータ発
生回路とデータ検出回路とを制御しデータ検出回路の出
力データを判定する制御回路と、相手機側電話番号と測
定項目および測定条件を記憶する記憶回路を備えた構成
とした。そのため、測定前に相手機側と電話で打合せす
ることがなく、また、測定項目毎に、測定器を交換する
必要がない、さらに、任意の時間に任意の相手機までの
電話回線の特性を測定できる。As explained above, the line quality measuring device of the present invention consists of a network control circuit that controls connection with a partner device, a data generation circuit that modulates and outputs transmission data of test signals and control signals, and 1. a branching circuit that branches out transmitted data and modulated received data from a partner device, a data detection circuit that demodulates and detects the received data, and a data detection circuit that controls the network control circuit, data generation circuit, and data detection circuit. The configuration includes a control circuit that determines the output data of the device, and a storage circuit that stores the telephone number of the other party, measurement items, and measurement conditions. Therefore, there is no need to discuss with the other party over the phone before measurement, there is no need to replace the measuring device for each measurement item, and the characteristics of the telephone line to any other party can be checked at any time. Can be measured.
第1図は本発明の第一の実施例を示す回路図、第2図は
本発明の回線品質測定機を使用したシステム構成図、
第3図は本発明の自動測定シーケンスを示した図、
第4図は、回線品質測定機が障害回線を保留した状態を
示した図、
第5図は本発明の第二の実施例を示す回路図、第6図は
本発明の回線品質測定機を発信側、着信側に複数台使用
したシステム構成図、第7図に示す第四の実施例は発信
側を電話機、着信側を本発明の回線品質測定機を使用し
たシステム構成図、
第8図は第7図のシステム構成図における、試験シーケ
ンスを示した図、
第9図は従来の回線品質測定機を使用したシステム構成
図。
1・・・データ発生回路、
2・・・データ検出回路、
3・・・記憶回路、
4・・・制御回路、
5・・・網制御回路、
6・・・分岐回路。FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a system configuration diagram using the line quality measuring device of the present invention, and FIG. 3 is a diagram showing an automatic measurement sequence of the present invention. Fig. 4 is a diagram showing a state in which the line quality measuring device holds a faulty line, Fig. 5 is a circuit diagram showing a second embodiment of the present invention, and Fig. 6 is a diagram showing the line quality measuring device of the present invention. The fourth embodiment shown in FIG. 7 is a system configuration diagram in which a plurality of units are used on the calling side and the receiving side, and a system configuration diagram in which a telephone is used on the calling side and the line quality measuring device of the present invention is used on the receiving side. is a diagram showing the test sequence in the system configuration diagram of FIG. 7, and FIG. 9 is a system configuration diagram using a conventional line quality measuring device. DESCRIPTION OF SYMBOLS 1...Data generation circuit, 2...Data detection circuit, 3...Storage circuit, 4...Control circuit, 5...Network control circuit, 6...Branch circuit.
Claims (1)
向する相手機と共に測定する回線品質測定機において、 前記相手機と接続するための制御をする網制御回路と、
テスト信号及び制御信号の送信データを変調し送出する
データ発生回路と、変調された送信データと前記相手機
からの変調された受信データを分岐する分岐回路と、前
記受信データを復調し検出するデータ検出回路と、前記
網制御回路と前記データ発生回路と前記データ検出回路
とを制御し前記データ検出回路からの出力データを判定
する制御回路と、前記相手機側電話番号と測定項目およ
び測定条件を記憶する記憶回路を備えたことを特徴とす
る回線品質測定機。[Scope of Claims] A line quality measuring device that measures the transmission characteristics of a general subscriber telephone line, which is a line to be measured, together with an opposing party's equipment, comprising: a network control circuit that controls connection with the partner's equipment;
A data generation circuit that modulates and sends out the transmission data of test signals and control signals, a branching circuit that branches the modulated transmission data and the modulated reception data from the partner device, and data that demodulates and detects the reception data. a detection circuit, a control circuit that controls the network control circuit, the data generation circuit, and the data detection circuit and determines output data from the data detection circuit; and a control circuit that determines output data from the data detection circuit; A line quality measuring device characterized by comprising a memory circuit for storing information.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2090230A JP2604261B2 (en) | 1990-04-06 | 1990-04-06 | Line quality measurement equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2090230A JP2604261B2 (en) | 1990-04-06 | 1990-04-06 | Line quality measurement equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03289747A true JPH03289747A (en) | 1991-12-19 |
JP2604261B2 JP2604261B2 (en) | 1997-04-30 |
Family
ID=13992688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2090230A Expired - Lifetime JP2604261B2 (en) | 1990-04-06 | 1990-04-06 | Line quality measurement equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2604261B2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5485616A (en) * | 1977-12-20 | 1979-07-07 | Nec Corp | Automatic circuit test system |
JPS63280555A (en) * | 1987-05-12 | 1988-11-17 | Nec Corp | Digital subscriber line test system |
JPH0281548A (en) * | 1988-09-17 | 1990-03-22 | Anritsu Corp | Transmission characteristic measuring method |
-
1990
- 1990-04-06 JP JP2090230A patent/JP2604261B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5485616A (en) * | 1977-12-20 | 1979-07-07 | Nec Corp | Automatic circuit test system |
JPS63280555A (en) * | 1987-05-12 | 1988-11-17 | Nec Corp | Digital subscriber line test system |
JPH0281548A (en) * | 1988-09-17 | 1990-03-22 | Anritsu Corp | Transmission characteristic measuring method |
Also Published As
Publication number | Publication date |
---|---|
JP2604261B2 (en) | 1997-04-30 |
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