JPH01117555A - Subscriber line test system - Google Patents
Subscriber line test systemInfo
- Publication number
- JPH01117555A JPH01117555A JP27640087A JP27640087A JPH01117555A JP H01117555 A JPH01117555 A JP H01117555A JP 27640087 A JP27640087 A JP 27640087A JP 27640087 A JP27640087 A JP 27640087A JP H01117555 A JPH01117555 A JP H01117555A
- Authority
- JP
- Japan
- Prior art keywords
- subscriber
- subscriber line
- circuit
- test
- line
- 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.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 60
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Monitoring And Testing Of Exchanges (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電話交換機における加入者回線試験方式に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a subscriber line testing system in a telephone exchange.
従来、この種の加入者回線試験方式においては、テスト
リンクを介して被試験回線を引き込んだときに、電話機
状態監視リレー回路に許容値以上の電流を流してこの回
路を破損する要因となるＲｉｎｇ（リング）線の地落、
Ｔｉｐ（チップ）線の混触という事態に対応するための
保護回路を設けていた。Conventionally, in this type of subscriber line testing method, when the line under test is drawn in through a test link, a current exceeding an allowable value flows through the telephone status monitoring relay circuit, causing damage to the circuit. (ring) line of ground,
A protection circuit was provided to deal with the situation of tip wires being touched.
上述した従来の加入者回線試験方式は、保護回路の存在
により、内部抵抗が高くなり、加入者回線のループ抵抗
が高い場合には、加入者電話機に十分な電流が流せない
という問題点があった。The conventional subscriber line testing method described above has the problem that the internal resistance becomes high due to the presence of the protection circuit, and if the loop resistance of the subscriber line is high, sufficient current cannot flow through the subscriber telephone. Ta.
本発明は、加入者回線および加入者電話機の各種試験を
行う加入者回線試験方式において、被試験加入者電話機
の状態を監視する監視リレー回路とテストリンクとの間
に設けた保護リレー回路と、前記テストリンクを介して
引き込まれた被試験加入者回線のリング線と地気間の抵
抗およびチップ線と地気間の電圧を測定する測定手段と
を加入者回線試験装置に設け、
加入者回線試験の際に前記被試験加入者回線が前記テス
トリンクを介して前記加入者回線試験装置に引き込まれ
たときに、前記抵抗値および電圧値の少なくともどちら
か一方が異常値であることを検出すると前記保護リレー
回路を開放して前記被試験加入者回線と前記監視リレー
回路とを切断することを特徴とする。The present invention provides a protection relay circuit provided between a test link and a monitoring relay circuit that monitors the state of a subscriber telephone under test in a subscriber line test method that performs various tests on subscriber lines and subscriber telephones; A subscriber line testing device is provided with measuring means for measuring the resistance between the ring wire and the ground air and the voltage between the tip line and the ground air of the subscriber line under test, which are drawn through the test link, and the subscriber line When it is detected that at least one of the resistance value and the voltage value is an abnormal value when the subscriber line under test is drawn into the subscriber line testing device via the test link during a test. The method is characterized in that the protection relay circuit is opened to disconnect the subscriber line under test and the monitoring relay circuit.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
加入者試験装置７は、加入者回線試験時に加入者電話機
の状態を監視する監視リレー回路６と、このリレー回路
６とテストリンク４との間に接続された保護リレー回路
５と、テストリンク４から引き込んだリング線１７と地
気間の抵抗を検出する機能とテストリンク４から引き込
んだチップ線 −１６と地気間の電圧を検出する機
能と各種の加入者回線試験を行う機能とを有する測定回
路８と、加入者回線試験装置制御回路９と、試験結果等
を試験装置用の加入者回路１１を介して加入者回線試験
用端末台１４へ送信するモデム１０と、スイッチ１８と
を備えている。The subscriber testing device 7 includes a monitoring relay circuit 6 that monitors the status of a subscriber telephone during a subscriber line test, a protective relay circuit 5 connected between the relay circuit 6 and the test link 4, and a test link 4. It has the function of detecting the resistance between the ring wire 17 drawn from the test link 4 and the ground air, the function of detecting the voltage between the chip wire 16 drawn from the test link 4 and the ground air, and the function of performing various subscriber line tests. It includes a measurement circuit 8, a subscriber line testing device control circuit 9, a modem 10 for transmitting test results etc. to a subscriber line testing terminal 14 via a subscriber circuit 11 for the testing device, and a switch 18. ing.
次に動作について説明する。Next, the operation will be explained.
加入者回線試験端末台１４からの操作によって、試験用
トランク１３に起動がかかり、交換網１２で受信された
起動信号は、中央制御装置１５によって起動が認識され
、加入者回線試験装置７を起動するための加入者回路１
１に起動信号が送出される。加入者回線試験装置７が起
動され、被試験電話機１に接続した加入者回線２が加入
者回路３からテストリンク４を介して、加入者回線試験
装置７へ引き込まれる。その直後にすなわち、測定回路
８が監視リレー回路６を使用して各種試験を行う前に、
加入者回線２のリング線と地気間の抵抗およびチップ線
と地気間の電圧を測定回路８によって測定し、制御回路
９はこの測定結果と所定値（スレッショルド）とを比較
し、少なくともどちらか一方が異常値（すなわち、抵抗
は所定値以下、電圧は所定値以上）の場合、スイ・ツチ
１８を切替えてアラームメツセージをモデム１０から加
入者回線試験端末台１４へ送出すると同時に保護リレー
５を開放して監視リレー回路６を保護する。The test trunk 13 is activated by the operation from the subscriber line testing terminal 14, and the activation signal received by the switching network 12 is recognized by the central control unit 15 and activates the subscriber line testing device 7. Subscriber circuit 1 for
A start signal is sent to 1. The subscriber line testing device 7 is activated, and the subscriber line 2 connected to the telephone under test 1 is drawn into the subscriber line testing device 7 from the subscriber circuit 3 via the test link 4. Immediately after that, that is, before the measurement circuit 8 performs various tests using the monitoring relay circuit 6,
The measurement circuit 8 measures the resistance between the ring wire and the earth of the subscriber line 2 and the voltage between the tip line and the earth, and the control circuit 9 compares the measurement results with a predetermined value (threshold) and determines at least which one. If one of them is an abnormal value (that is, the resistance is below a predetermined value and the voltage is above a predetermined value), the switch 18 is switched to send an alarm message from the modem 10 to the subscriber line test terminal 14, and at the same time the protection relay 5 is opened to protect the monitoring relay circuit 6.
以上説明したように本発明は、加入者回線がテストリン
ク経由で加入者回線試験装置へ引き込まれた直後に、リ
ング線と地気間の抵抗およびチップ線と地気間の電圧を
測定して所定値と比較し異常を検出した場合に、保護リ
レー回路を開放することで加入者電話機状態監視リレー
に許容値以上の電流が流れ、破壌されることを防止する
という効果がある。As explained above, the present invention measures the resistance between the ring wire and the ground and the voltage between the tip line and the ground immediately after the subscriber line is drawn into the subscriber line testing equipment via the test link. When an abnormality is detected by comparison with a predetermined value, opening the protective relay circuit has the effect of preventing a current exceeding the permissible value from flowing through the subscriber telephone status monitoring relay and damaging it.
第１図は本発明の一実施例のブロック図である。
１・・・・・・加入者電話機、２・・・・・・加入者回
線、３゜１１・・・・・・加入者回路、４・・・・・・
テストリンク、５・・・・・・保護リレー回路、６・・
・・・・加入者電話機状態監視リレー回路、７・・・・
・・加入者回線試験装置、８・・・・・・測定回路、９
・・・・・・加入者回線試験装置制御回路、１０・・・
・・・モデム、１２・・・・・・交換網、１３・・・・
・・試験用トランク、１４・・・・・・加入者回線試験
端末台、１５・・・・・・中央制御装置、１６・・・・
・・チップ線、１７・・・・・・リング線。FIG. 1 is a block diagram of one embodiment of the present invention. 1...Subscriber telephone, 2...Subscriber line, 3゜11...Subscriber circuit, 4...Subscriber line
Test link, 5...Protection relay circuit, 6...
...Subscriber telephone status monitoring relay circuit, 7...
...Subscriber line testing equipment, 8...Measurement circuit, 9
...Subscriber line testing device control circuit, 10...
...Modem, 12...Switching network, 13...
...Test trunk, 14...Subscriber line test terminal unit, 15...Central control unit, 16...
...Tip wire, 17...Ring wire.
Claims (1)
回線試験方式において、 被試験加入者電話機の状態を監視する監視リレー回路と
テストリンクとの間に設けた保護リレー回路と、前記テ
ストリンクを介して引き込まれた被試験加入者回線のリ
ング線と地気間の抵抗およびチップ線と地気間の電圧を
測定する測定手段とを加入者回線試験装置に設け、 加入者回線試験の際に前記被試験加入者回線が前記テス
トリンクを介して前記加入者回線試験装置に引き込まれ
たときに、前記抵抗値および電圧値の少なくともどちら
か一方が異常値であることを検出すると前記保護リレー
回路を開放して前記被試験加入者回線と前記監視リレー
回路とを切断することを特徴とする加入者回線試験方式
。[Scope of Claims] A protection relay circuit provided between a test link and a monitoring relay circuit that monitors the status of a subscriber telephone under test in a subscriber line test method that performs various tests on subscriber lines and subscriber telephones. and a measuring means for measuring the resistance between the ring wire and the ground and the voltage between the tip line and the ground of the subscriber line under test drawn through the test link, and When the subscriber line under test is drawn into the subscriber line testing equipment via the test link during a subscriber line test, it is determined that at least one of the resistance value and the voltage value is an abnormal value. A subscriber line testing method characterized in that, upon detection, the protection relay circuit is opened to disconnect the subscriber line under test and the monitoring relay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27640087A JPH01117555A (en) | 1987-10-30 | 1987-10-30 | Subscriber line test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27640087A JPH01117555A (en) | 1987-10-30 | 1987-10-30 | Subscriber line test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01117555A true JPH01117555A (en) | 1989-05-10 |
Family
ID=17568879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27640087A Pending JPH01117555A (en) | 1987-10-30 | 1987-10-30 | Subscriber line test system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01117555A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53138209A (en) * | 1977-05-09 | 1978-12-02 | Hitachi Ltd | Protective system of trunk circuit |
-
1987
- 1987-10-30 JP JP27640087A patent/JPH01117555A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53138209A (en) * | 1977-05-09 | 1978-12-02 | Hitachi Ltd | Protective system of trunk circuit |
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