JPS61154343A - Digital subscriber line supervisory system - Google Patents

Digital subscriber line supervisory system

Info

Publication number
JPS61154343A
JPS61154343A JP27686584A JP27686584A JPS61154343A JP S61154343 A JPS61154343 A JP S61154343A JP 27686584 A JP27686584 A JP 27686584A JP 27686584 A JP27686584 A JP 27686584A JP S61154343 A JPS61154343 A JP S61154343A
Authority
JP
Japan
Prior art keywords
data
digital subscriber
line
subscriber line
termination device
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
Application number
JP27686584A
Other languages
Japanese (ja)
Inventor
Kenji Tsutsumi
堤　謙二
Yasunori Ogawa
小川　保典
Yasuo Tanaka
康夫 田中
Ryoji Shimozono
下園　良二
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP27686584A priority Critical patent/JPS61154343A/en
Publication of JPS61154343A publication Critical patent/JPS61154343A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H04M3/302—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs
    • H04M3/303—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs and using PCM multiplexers, e.g. pair gain systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

PURPOSE:To obtain a simple supervisory system of a digital subscriber line by transmitting a training pattern for adjusting an equalizer at the station side at non-talking, reflecting it at the subscriber side and collating the pattern reflected by the station side with the transmission pattern. CONSTITUTION:A central processing unit 5 actuates a relay in a line terminator 3 at the station side when a digital subscriber line 2 is idle to lead the line 2 to a data collation test device 10. The training patern for adjusting the equalizer is transmitted from the test device 10 to command the reflection of the data in a subscriber-side line terminator 1 by a maintenance bit. The test device 10 collates the data transmitted by the station side device 3 with the data reflected from the side of the subscriber device 1. Thus, the digital subscriber line 2 is tested at non-talking in this way to supervise the digital subscriber line.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電子交換機のディジタル加入者線監視方式に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital subscriber line monitoring system for an electronic exchange.

最近電子交換機にディジタル加入者線が接続されるよう
になって来たが、此の場合に於けるディジタル加入者線
の監視方式の確立が強く要望されている。Recently, digital subscriber lines have come to be connected to electronic exchanges, and there is a strong desire to establish a system for monitoring digital subscriber lines in this case.

〔従来の技術〕[Conventional technology]

最近の電子交換機にはディジタル加入者線が接続される
ようになって来たが、其の概要を以下に゛述べる。Digital subscriber lines have recently come to be connected to electronic exchanges, and an overview of this is described below.

第４図は従来のディジタル加入者線を使用するディジタ
ル加入者伝送方式の一例を説明する為の図である。FIG. 4 is a diagram for explaining an example of a digital subscriber transmission system using a conventional digital subscriber line.

第５図はディジタル加入者伝送方式に於いて使用されて
いるデータフォーマットを示す。FIG. 5 shows the data format used in the digital subscriber transmission system.

図中、１は宅内側回線終端装置、２はディジタル加入者
線路、３は局側回線終端装置、４はネットワーク、５は
中央処理装置、６は電話機である。In the figure, reference numeral 1 designates a home line termination device, 2 a digital subscriber line, 3 a central office line termination device, 4 a network, 5 a central processing unit, and 6 a telephone set.

尚以下企図を通じ同一記号は同一対象物を表す。Note that the same symbols represent the same objects throughout the following discussion.

周知の様に二線式線路である従来の加入者線を使用する
ディジタル加入者伝送方式は所謂ピンポン伝送方式を採
っている。As is well known, the digital subscriber transmission system using conventional subscriber lines, which are two-wire lines, employs a so-called ping-pong transmission system.

以下共の一例に就いて説明する。An example of both will be explained below.

本通信方式では局側から宅内側へ第５図に示すデータフ
ォーマットをバイポ＝う形式の信号により送出する。In this communication system, the data format shown in FIG. 5 is sent from the office side to the home side as a bipo-format signal.

此のデータフォーマットは３２０にボーの通信速度で伝
送され、１データフオーマツトは３７７ビツト編成で、
１．２５ｍ５である。This data format is transmitted at a communication speed of 320 baud, and one data format consists of 377 bits.
It is 1.25m5.

此のデータフォーマントに於いて、Ｆはフラグで同期用
に使われ、普通８ビツトで構成される。In this data formant, F is a flag used for synchronization, and is usually composed of 8 bits.

Ｍは８ビツトで構成されるメンテナンスビットで此の信
号により立上げが行われる。Ｂ＋　、Ｂｚ、Ｄは夫々情
報チャンネルでＢ、　、Ｂ、は共に８ビツトで構成され
て通話用に使用され、Ｄは１ビツトからなり、オフフッ
タ信号、オンフック信号等の制御信号に使われる。Ｌは
ＤＣバランスビットで１データフオーマツトのＤＣレベ
ルがＯとなる様に調整する作用を行っている。M is a maintenance bit consisting of 8 bits and is activated by this signal. B+, Bz, and D are information channels, and B, B, and B are each composed of 8 bits and are used for communication, and D is composed of 1 bit and is used for control signals such as off-footer signals and on-hook signals. L is a DC balance bit that adjusts the DC level of one data format to O.

第６図は局側回線終端装置と宅内側回線終端装置間の伝
送データを示す図である。FIG. 6 is a diagram showing data transmitted between the station-side line termination device and the home-side line termination device.

無通話状態、及びデータを伝送していない状態では宅内
側から局側へ何等のデータも送らないが、局側から宅内
側を呼び出したり、宅内側が発信する時は第６図に点線
で示すデータフォーマットを宅内側から送出して、通話
状態、又はデータ伝送状態に入る。When there is no call or no data is being transmitted, no data is sent from the inside of the home to the central office, but when the central office calls the inside of the home or the inside of the home makes a call, the data indicated by the dotted line in Figure 6 is sent. The format is sent from inside the home and the system enters a call state or a data transmission state.

尚実線は局側から宅内側へ送られる第５図のデータフォ
ーマットであり、点線で示すデータフォーマットは第５
図のデータフォーマットと同じである。従って局側から
送られるデータフォーマットと宅内側から送られるデー
タフォーマットの伝送時間は１組で２．５　ｍ　Ｓとな
る。The solid line is the data format shown in Figure 5 that is sent from the central office to the customer's premises, and the data format shown in dotted line is the data format shown in Figure 5.
The data format is the same as the one shown in the figure. Therefore, the transmission time for one set of data formats sent from the office side and data formats sent from the home side is 2.5 mS.

此の様に二線式線路を時分割式に使用して相互通信を行
う。In this way, two-wire lines are used in a time-sharing manner for mutual communication.

此のディジタル加入者線の場合は、従来のアナログ加入
者線と異なり、伝送誤り率、雑音特性等の線路の特性が
重要になってくるが、此の様な線路特性を監視する方式
は未だ確立されていない。In the case of digital subscriber lines, unlike conventional analog subscriber lines, line characteristics such as transmission error rate and noise characteristics are important, but there is still no method for monitoring such line characteristics. Not established.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明の目的はディジタル加入者線の簡潔な監視方式を
提供することである。It is an object of the present invention to provide a simple monitoring scheme for digital subscriber lines.

〔問題点を解決するための手段〕[Means for solving problems]

問題点を解決するための手段は、ディジタル加入者線を
使用するディジタル加入者伝送方式に於いて、加入者が
該ディジタル加入者線を通話等に使用していない時、局
側から宅内側へ等化器調整用トレーニングパターンを送
出し、該宅内側ではメンテナンスビットによる指示に基
づき受信データを折返して該局側へ送出し、該局側に於
いて前記送出トレーニングパターンと受信した前記トレ
ーニングパターンを照合することにより達成される。The solution to this problem is that in a digital subscriber transmission system that uses a digital subscriber line, when the subscriber is not using the digital subscriber line for telephone calls, A training pattern for equalizer adjustment is sent out, and the received data is looped back and sent to the station based on instructions from the maintenance bit at the home, and the station side combines the transmitted training pattern and the received training pattern. This is achieved by matching.

又ディジタル加入者線を使用するディジタル加入者伝送
方式に於いて、局側回線終端装置と宅内側回線終端装置
間の伝送データの中に折り返しデータエリアを設け、該
局側回線終端装置に前記データエリア内に折り返しデー
タの挿入手段を設け、該宅内側回線終端装置に前記折り
返しデータの抽出手段と前記抽出データを再び前記デー
タエリア内に挿入する手段とを設けることにより、通話
状態に於いて該局側回線終端装置で前記データエリア内
に挿入したデータと該局側回線終端装置で前記折り返し
データから抽出したデータを照合することにより達成さ
れる。In addition, in a digital subscriber transmission system using a digital subscriber line, a return data area is provided in the data transmitted between the line termination device on the office side and the line termination device on the home side, and the data is transferred to the line termination device on the office side. By providing means for inserting return data within the area, and providing means for extracting the return data and means for reinserting the extracted data into the data area in the in-home line termination device, it is possible to This is achieved by comparing the data inserted into the data area by the station-side line terminating device with the data extracted from the return data by the station-side line terminating device.

〔作用〕[Effect]

本発明に依ると無通話時には情報チャンネルにトレーニ
ングパターンを乗せて局側局側回線終端装置から送出し
、宅内側回線終端装置では上記トレーニングパターンを
折り返し送出し、局側局側回線終端装置では前記折り返
し信号を受信し、送出信号と受信信号を比較照合して試
験を行うのでディジタル加入者線を的確に監視出来ると
云う効果が生まれる。According to the present invention, when there is no call, a training pattern is placed on the information channel and sent out from the central office side line terminating device, the home side line terminating device returns the above training pattern, and the central office side line terminating device transmits the above training pattern. Since the return signal is received and a test is performed by comparing the transmitted signal and the received signal, the effect is that the digital subscriber line can be accurately monitored.

又通話時には伝送データの中に折り返しデータエリアを
設け、局側回線終端装置に於いて此のデータエリア内に
折り返しデータの挿入して送出し、宅内側回線終端装置
に於いては此の折り返しデータを抽出し、再び挿入して
局側回線終端装置へ送出し、局側回線終端装置は受信し
た折り返しデータと先に送出した折り返しデータを比較
照合して試験を行うのでディジタル加入者線を的確に監
視出来ると云う効果が生まれる。Also, during a call, a return data area is provided in the transmission data, and the line termination device at the station inserts and sends the return data into this data area, and the line termination device at the home side inserts the return data into this data area and sends it out. The data is extracted, reinserted, and sent to the line termination equipment on the central office side. The line termination equipment on the central office side compares and tests the received loopback data with the previously sent loopback data. This has the effect of being able to be monitored.

〔実施例〕〔Example〕

第１図は本発明に依るディジタル加入者線監視方式の一
実施例を示す図である。FIG. 1 is a diagram showing an embodiment of a digital subscriber line monitoring system according to the present invention.

図中、１０はデータ照合試験器である。In the figure, 10 is a data matching tester.

従来の技術の項で説明した様に第５図に示すデータフォ
ーマットを局側から宅内側へ送出するが、空き状態、即
ち無通話状態では前記データフォーマットの情報チャン
ネルＣＢ、＋　、、Ｂｚ　）にはデータは乗っていない
。一方宅内側から局側へは何らのデータも送られていな
い。As explained in the section of the prior art, the data format shown in FIG. does not contain data. On the other hand, no data is being sent from the inside of the home to the central office.

本発明は空き状態、即ち情報チャンネルが使用されてい
ない状態の時に情報チャンネル（Ｂ、、ＢＺ）にトレー
ニングパターンを乗せて局側から被試験ディジタル加入
者線路２を経由して宅内側へ送出し、宅内側回線終端装
置１では此の信号を折り返して再びディジタル加入者線
路２に送出し、局側では其の受信信号と送信信号をデー
タ照合試験器１０に引き込み、照合して良否を判定する
試験を行う。The present invention transmits a training pattern to the information channel (B, , BZ) from the office side to the premises via the digital subscriber line 2 under test when the information channel is idle, that is, when the information channel is not in use. The in-house line termination device 1 loops back this signal and sends it out again to the digital subscriber line 2, and at the office side, the received signal and the transmitted signal are input to the data matching tester 10 and compared to determine pass/fail. Conduct the test.

尚トレーニングパターンとはディジタル加入者線路の線
路特性を補償する為に宅内側回線終端装置１に設けられ
ている等化器を調整する為に局側から送出する試験パタ
ーンである。It should be noted that the training pattern is a test pattern sent from the office side in order to adjust the equalizer provided in the in-house line termination device 1 in order to compensate for the line characteristics of the digital subscriber line.

以下に本発明に依る試験手順を示す。The test procedure according to the present invention is shown below.

（１）中央処理装置５がディジタル加入者線路２が空き
状態で゛あるか、否かを調べる。(1) The central processing unit 5 checks whether the digital subscriber line 2 is idle.

（２）空きの状態であれば局側回線終端装置３内のリレ
ーを動作させてディジタル加入者線路２をデータ照合試
験器１０に引き込む。(2) If the state is vacant, the relay in the station-side line termination device 3 is operated to draw the digital subscriber line 2 into the data matching tester 10.

（３）メンテナンスビットＭにより宅内側回線終端装置
１内に於けるデータの折返しを指示する。(3) Maintenance bit M instructs data loopback within the in-home line termination device 1.

（４）データ照合試験器１０により局側回線終端装置３
が送出したデータと宅内側回線終端装置１から折返えさ
れて来たデータを照合する。(4) The data verification tester 10 checks the line termination device 3 on the station side.
The data sent by the in-house line terminal device 1 is compared with the data returned from the in-house line terminal device 1.

此の様にして無通話時にディジタル加入者線路２の試験
を行い、ディジタル加入者線路の監視を行うことが出来
る。In this way, the digital subscriber line 2 can be tested and monitored when there is no call.

第２図は本発明に依る通話時に於けるディジタル加入者
線路試験の一実施例を示す図である。FIG. 2 is a diagram showing an embodiment of a digital subscriber line test during a call according to the present invention.

第３図は本発明に依るデータフォーマットの一実施例を
示す図である。FIG. 3 is a diagram showing one embodiment of a data format according to the present invention.

図中、１゛は宅内側回線終端装置、１１は挿入器、１２
は送信器、１３はトランス、１４は受信器、１５は抽出
器、１６はバッファ、３′は局側回線終端装置、１７は
トランス、１８は送信器、１９は挿入器、２０は受信器
、２１は抽出器、２２は照合器、２３は折り返しパター
ン発生器である。In the figure, 1 is a home line termination device, 11 is an inserter, and 12
is a transmitter, 13 is a transformer, 14 is a receiver, 15 is an extractor, 16 is a buffer, 3' is a station side line termination device, 17 is a transformer, 18 is a transmitter, 19 is an inserter, 20 is a receiver, 21 is an extractor, 22 is a collation device, and 23 is a folding pattern generator.

以下図に従って本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.

本発明では第３図に示す様にメンテナンスビットＭを４
ビツトからなる制御ビット部Ｍｃ　ｓ　４ビツトからな
る折り返しデータ部Ｍｄに分ける。In the present invention, the maintenance bit M is set to 4 as shown in Fig. 3.
It is divided into a control bit part Mcs consisting of bits and a return data part Md consisting of 4 bits.

局側では折り返しパターン発生器２３から４ビツトの試
験データを出し、挿入器１９によりデータフォーマット
の折り返しデータ部に挿入する。On the station side, the return pattern generator 23 outputs 4-bit test data, and the inserter 19 inserts it into the return data portion of the data format.

試験データを挿入されたデータフォーマットは送信器１
８によりディジタル加入者線路２を経由して宅内側回線
終端装置１゛へ送られる。The data format in which the test data was inserted is transmitter 1.
8, the signal is sent via the digital subscriber line 2 to the in-home line termination device 1'.

宅内側回線終端装置１゛ではトランス１３を介°して受
信器１４で受信し、抽出器１５により前記４ビツトの試
験データを抽出し、バッファ１６に一時格納する。In the in-house line termination device 1, the test data is received by a receiver 14 via a transformer 13, and the 4-bit test data is extracted by an extractor 15 and temporarily stored in a buffer 16.

宅内側回線終端装置１′に対してはメンテナンスビット
Ｍの制御ビット部Ｍｅにより折り返し指令が出ているの
でデータフォーマットを折り返し発信する。此の時挿入
器１１は所定の位置に、バ。Since a return command has been issued to the in-home line termination device 1' by the control bit part Me of the maintenance bit M, the data format is sent back. At this time, the inserter 11 is in a predetermined position.

ファ１６に格納されていた前記４ビツトの試験データを
挿入する。此のデータフォーマットは送信器１２により
ディジタル加入者線路２を経由して局側回線終端装置３
”へ送られる。The 4-bit test data stored in the file 16 is inserted. This data format is transmitted by the transmitter 12 via the digital subscriber line 2 to the station-side line termination device 3.
” will be sent to.

局側回線終端装置３゛ではトランス１７を介して受信器
２０で受信し、抽出器２１により前記４ビツトの試験デ
ータを抽出し、照合器２２に出力する。In the station side line termination device 3', the test data is received by the receiver 20 via the transformer 17, and the 4-bit test data is extracted by the extractor 21 and outputted to the collation unit 22.

照合器２２は抽出器２１から入力した４ビツトの試験デ
ータと折り返しパターン発生器２３から入力した試験デ
ータを照合する。The collation unit 22 collates the 4-bit test data inputted from the extractor 21 and the test data inputted from the aliasing pattern generator 23.

此の様にして通話中にディジタル加入者線路２を含むル
ートの良否を試験し、中央処理装置５に通知することが
出来る。In this way, the quality of the route including the digital subscriber line 2 can be tested during a call and the central processing unit 5 can be notified.

〔発明の効果〕〔Effect of the invention〕

以上詳細に説明した様に本発明によれば、無通話時及び
通話時にディジタル加入者線の簡潔な監視方式を実現出
来ると云う大きい効果がある。As described in detail above, the present invention has the great effect of realizing a simple monitoring system for digital subscriber lines during no calls and during calls.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明に依るディジタル加入者線監視方式の一
実施例を示す図である。 第２図は本発明に依る通話時に於けるディジタル加入者
線路試験の一実施例を示す図である。 第３図は本発明に依るデータフォーマットの一実施例を
示す図である。 第４図は従来のディジタル加入者線を使用するディジタ
ル加入者伝送方式の一例を説明する為の図である。 第５図はディジタル加入者伝送方式に於いて使用されて
いるデータフォーマットを示す。 第６図はディジタル加入者伝送方式を説明する図である
。 図中、１は宅内側回線終端装置、２はディジタル加入者
線路、３は局側回線終端装置、４はネットワーク、５は
中央処理装置、６は電話機、１′は宅内側回線終端装置
、１０はデータ照合試験器、１１は挿入器、１２は送信
器、１３はトランス、１４は受信器、１５は抽出器、１
６はバッファ、３”は局側回線終端装置、１７はトラン
ス、１８は送信器、１９は挿入器、２０は受信器、２１
は抽出器、２２は照合器、２３は折り返しパターン発生
器である。 茅　１　口 乙 纂２．圀 早　３　口 Ｃ 早　４　図 箒　乙　日FIG. 1 is a diagram showing an embodiment of a digital subscriber line monitoring system according to the present invention. FIG. 2 is a diagram showing an embodiment of a digital subscriber line test during a call according to the present invention. FIG. 3 is a diagram showing one embodiment of a data format according to the present invention. FIG. 4 is a diagram for explaining an example of a digital subscriber transmission system using a conventional digital subscriber line. FIG. 5 shows the data format used in the digital subscriber transmission system. FIG. 6 is a diagram illustrating a digital subscriber transmission system. In the figure, 1 is a home line termination device, 2 is a digital subscriber line, 3 is an office side line termination device, 4 is a network, 5 is a central processing unit, 6 is a telephone, 1' is a home line termination device, 10 is a data matching tester, 11 is an inserter, 12 is a transmitter, 13 is a transformer, 14 is a receiver, 15 is an extractor, 1
6 is a buffer, 3'' is a station side line termination device, 17 is a transformer, 18 is a transmitter, 19 is an inserter, 20 is a receiver, 21
22 is an extractor, 22 is a collation device, and 23 is a folding pattern generator. Kaya 1 Word of mouth 2. Kunisaya 3 Kuchi C Haya 4 Zuhoki Otsu Day

Claims (1)

【特許請求の範囲】 １、ディジタル加入者線を使用するディジタル加入者伝
送方式に於いて、加入者が該ディジタル加入者線を通話
等に使用していない時、局側から宅内側へ等化器調整用
トレーニングパターンを送出し、該宅内側ではメンテナ
ンスビットによる指示に基づき受信データを折返して該
局側へ送出し、該局側に於いて前記送出トレーニングパ
ターンと受信した前記トレーニングパターンを照合する
ことを特徴とするディジタル加入者線監視方式。 ２、ディジタル加入者線を使用するディジタル加入者伝
送方式に於いて、局側回線終端装置と宅内側回線終端装
置間の伝送データの中に折り返しデータエリアを設け、
該局側回線終端装置に前記データエリア内に折り返しデ
ータの挿入手段を設け、該宅内側回線終端装置に前記折
り返しデータの抽出手段と前記抽出データを再び前記デ
ータエリア内に挿入する手段とを設けることにより、通
話状態に於いて該局側回線終端装置で前記データエリア
内に挿入したデータと該局側回線終端装置で前記折り返
しデータから抽出したデータを照合することを特徴とす
るディジタル加入者線監視方式。[Claims] 1. In a digital subscriber transmission system that uses a digital subscriber line, when the subscriber is not using the digital subscriber line for calls, etc., equalization from the office side to the home side. At the home side, the received data is looped back and sent to the station side based on the instruction by the maintenance bit, and at the station side, the transmitted training pattern is compared with the received training pattern. A digital subscriber line monitoring system characterized by: 2. In a digital subscriber transmission system using a digital subscriber line, a return data area is provided in the transmission data between the office side line termination device and the home side line termination device,
The station-side line terminating device is provided with means for inserting return data into the data area, and the home-side line terminating device is provided with means for extracting the return data and means for inserting the extracted data into the data area again. A digital subscriber line characterized in that the data inserted into the data area by the line termination device on the station side and the data extracted from the return data by the line termination device on the station side during a call state are compared. Monitoring method.
JP27686584A 1984-12-27 1984-12-27 Digital subscriber line supervisory system Pending JPS61154343A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27686584A JPS61154343A (en) 1984-12-27 1984-12-27 Digital subscriber line supervisory system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27686584A JPS61154343A (en) 1984-12-27 1984-12-27 Digital subscriber line supervisory system

Publications (1)

Publication Number Publication Date
JPS61154343A true JPS61154343A (en) 1986-07-14

Family

ID=17575490

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27686584A Pending JPS61154343A (en) 1984-12-27 1984-12-27 Digital subscriber line supervisory system

Country Status (1)

Country Link
JP (1) JPS61154343A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63280555A (en) * 1987-05-12 1988-11-17 Nec Corp Digital subscriber line test system
JPH03212051A (en) * 1990-01-17 1991-09-17 Toshiba Corp Data error detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63280555A (en) * 1987-05-12 1988-11-17 Nec Corp Digital subscriber line test system
JPH03212051A (en) * 1990-01-17 1991-09-17 Toshiba Corp Data error detector

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