JPH03139933A - System for measuring line quality - Google Patents

System for measuring line quality

Info

Publication number
JPH03139933A
JPH03139933A JP27942589A JP27942589A JPH03139933A JP H03139933 A JPH03139933 A JP H03139933A JP 27942589 A JP27942589 A JP 27942589A JP 27942589 A JP27942589 A JP 27942589A JP H03139933 A JPH03139933 A JP H03139933A
Authority
JP
Japan
Prior art keywords
error
circuit
flag
sum
flag sequence
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
JP27942589A
Other languages
Japanese (ja)
Inventor
Hideyasu Hashiba
橋場 秀逸
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP27942589A priority Critical patent/JPH03139933A/en
Publication of JPH03139933A publication Critical patent/JPH03139933A/en
Pending legal-status Critical Current

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  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To prevent a line to be measured from being exclusively used and to always attain the measurement of line quality by counting up the sum of outputs from an OR circuit for finding out the sum of an error output from a flag sequence error detecting circuit and an error output from a frame error detecting circuit. CONSTITUTION:A flag sequence error detecting circuit 4 monitors a flag pattern, and when data other than a prescribed pattern are inputted and the following octet is a flag pattern, the generation of an error in the flag sequence is judged and pulses corresponding to the number of errors are outputted. When data other than the flag sequence are inputted, a flame error detecting circuit 5 detects the existence of an error in data existing up to the next flag sequence and data in a flag check sequence existing in the final two octets, and when the error exists, outputs one pulse. The OR circuit finds out the sum of the outputs of these circuits and output the sum result to an error counting circuit 7 to count up the sum of errors. Consequently, the quality of lines can be measured without exerting influence upon a using line.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はデータIgI線の回線品質評価に関し。[Detailed description of the invention] (Industrial application field) The present invention relates to line quality evaluation of data IgI lines.

特にその測定方式に関する。Especially regarding its measurement method.

(従来の技術) 従来、この種の回線品質測定方式は対象回線に一定の符
号パターンを有するデータを送出し。
(Prior Art) Conventionally, this type of line quality measurement method sends data with a certain code pattern to the target line.

受信されたデータとその符号パターンとの照合管行うこ
とにより、符号誤りを検出して回線品質全測定していた
By comparing the received data with its code pattern, code errors were detected and the line quality was fully measured.

(発明が解決しようとする課題) 上述した従来の回線品質測定方式では、測定のために対
象回線を専有してしまうため9回線の使用を中断する必
要があり、そのために常時。
(Problems to be Solved by the Invention) In the conventional line quality measurement method described above, since the target line is monopolized for measurement, it is necessary to suspend the use of 9 lines, and for this reason, the use of the 9 lines must be interrupted at all times.

測定を実施できないと云う欠点がある。The disadvantage is that measurements cannot be carried out.

本発明の目的は、ハイレベルデータリンク制御手順にお
けるフラグシーケンス上の誤りビットを検出するととも
に、フレームチェックシーケンスによるフレーム誤り金
検出し、これらによって得られ九誤り数を合成すること
により上記欠点全除去し、常時、測定全実施できるよう
に構成した回線品質測定方式を提供することにある。
The object of the present invention is to detect error bits on a flag sequence in a high-level data link control procedure, detect frame error bits in a frame check sequence, and eliminate all of the above-mentioned defects by combining the nine error numbers obtained from these. However, it is an object of the present invention to provide a line quality measurement method configured so that all measurements can be carried out at all times.

(課題を解決するための手段) 本発明による回線品質測定方式はフラグシーケンス誤り
検出回路と、フレーム誤り検出回路と、論理和回路と、
誤り計数回路とを具備して構成したものである〇 フラグシーケンス誤り検出回路は、ノ1イレベルデータ
リンク制御手順によりデータ通信を行う回線におけるフ
ラグシーケンス上の誤9ビツトヲ検出する九めのもので
ある。
(Means for Solving the Problems) The line quality measurement method according to the present invention includes a flag sequence error detection circuit, a frame error detection circuit, an OR circuit,
The flag sequence error detection circuit is a ninth circuit that detects nine erroneous bits in the flag sequence on a line that performs data communication using the No. 1 level data link control procedure. be.

フレーム誤り検出回路は、フレームチエツクジ−タンス
によるフレームの誤り全検出するためのものである。
The frame error detection circuit is for detecting all frame errors by frame check resistance.

論理和回路は、フラグシーケンス誤り検出回路の誤り出
力、およびフレーム誤ジ検出回路の誤り出力の和全求め
るためのものである。
The OR circuit is for calculating the total sum of the error output of the flag sequence error detection circuit and the error output of the frame error detection circuit.

誤り計数回路は、論理和回路の出力の和を計数するため
のものである。
The error counting circuit is for counting the sum of the outputs of the OR circuit.

(実 施 例) 次に9本発明について図面を診照して説明する。(Example) Next, the present invention will be explained with reference to the drawings.

第1図は1本発明による回線品質測定方式の一実施例を
示すブロック図である。第1図において、1は受信回線
、2はDOE、3はDTJ4はフラグシーケンスvAv
検出回路、5はフレーム誤り検出回路、6は論理和回路
、7は誤り計数回路である。
FIG. 1 is a block diagram showing an embodiment of a line quality measurement method according to the present invention. In FIG. 1, 1 is the receiving line, 2 is DOE, 3 is DTJ4 is the flag sequence vAv
The detection circuit includes a frame error detection circuit 5, an OR circuit 6, and an error counting circuit 7.

受信回線1より入力された受信信号はI)OR3により
復調され、DTFJ3に入力される。この間、1)OR
3により復調されたディジタル信号はフラグシーケンス
誤り検出回路4.およびフレーム誤り検出回路5に入力
される。
The received signal inputted from the receiving line 1 is demodulated by I)OR3 and inputted to DTFJ3. During this time, 1) OR
The digital signal demodulated by 3 is sent to a flag sequence error detection circuit 4. and is input to the frame error detection circuit 5.

フラグシーケンス誤り検出回路4では、フラグパターン
r01111110Jを常時、監視している。このパタ
ーン以外のデータが入力され九とき、続くオクテツトが
フラグパターンであったときには、フラグシーケンス誤
り検出回路4はフラグシーケンスに誤りがあったものと
判断し、その誤りの数に応じたパルスを論理和回路6に
出力する。フラグシーケンス以外のデータが入力された
とき、フレーム誤り検出回路5では次のフラグシーケン
スまでのデータと。
The flag sequence error detection circuit 4 constantly monitors the flag pattern r01111110J. When data other than this pattern is input and the following octet is a flag pattern, the flag sequence error detection circuit 4 determines that there is an error in the flag sequence, and outputs pulses corresponding to the number of errors in the logic. Output to sum circuit 6. When data other than the flag sequence is input, the frame error detection circuit 5 inputs data up to the next flag sequence.

最終の2オクテツトに存在するフラグチエツクシーケン
スとのORO方式による誤りの有無を検出する。誤りが
あったとき、フレーム誤り検出回路5は1個のパルスを
論理和回路6に出力する。
The presence or absence of an error is detected using the ORO method with the flag check sequence existing in the last two octets. When an error occurs, the frame error detection circuit 5 outputs one pulse to the OR circuit 6.

論理和回路6ではフラグシーケンス誤り検出回路4.お
よびフレームfAり検出回路5の出力の和をと9.誤り
計数回路7に結果金出して誤りの総和を計数する0 誤り計数回路7にはフラグシーケンス上の唱りビット数
と、フレーム誤り数との和が計数されることになる。通
常のデータ回線の品質の最悪値は104程度であるが、
これ以上の良好な品質であれば、同一フレーム上で2ビ
ット以上が誤る確率は小さく、誤り計数回路7の値は対
象回線のビット誤りと推定できる。
The OR circuit 6 includes a flag sequence error detection circuit 4. and the sum of the outputs of the frame fA detection circuit 5.9. The result is sent to the error counting circuit 7 to count the total number of errors.The error counting circuit 7 counts the sum of the number of bits cast on the flag sequence and the number of frame errors. The worst value of normal data line quality is around 104,
If the quality is better than this, the probability that two or more bits will be erroneous in the same frame is small, and the value of the error counting circuit 7 can be estimated to be a bit error in the target line.

(発明の効果) 以上説明し次ように本発明は、ノ1イレベルデータリン
ク制御手順におけるフラグシーケンス上の誤9ビツトを
検出するとともに、フレームチェックシーケンスによる
フレーム誤ジを検出し、これらによって得られた誤り数
全合成することにより、使用中の回線に影響を与えるこ
となく、常時1回線品質t−測定することが可能となり
、特に高品質の回線を容易に測定できると云う効果があ
る。
(Effects of the Invention) As explained above and as follows, the present invention detects nine erroneous bits on the flag sequence in the No. 1 level data link control procedure, detects frame errors in the frame check sequence, and obtains the following advantages. By fully synthesizing the number of errors, it is possible to always measure the quality of one line t- without affecting the line in use, and there is an advantage that especially high-quality lines can be easily measured.

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

第1図は1本発明による回線品gi、!jlll定方式
の一実施例1示すブロック図である。 1・・・受信回線   2・・・DOE3・・・D T
 E 4・・・フラグシーケンス誤り検出回路5・・・フレー
ム誤り検出回路
FIG. 1 shows a line product gi according to the present invention! FIG. 1 is a block diagram showing an example 1 of a JLL fixed method; 1...Reception line 2...DOE3...D T
E 4...Flag sequence error detection circuit 5...Frame error detection circuit

Claims (1)

【特許請求の範囲】[Claims] ハイレベルデータリンク制御手順によりデータ通信を行
う回線におけるフラグシーケンス上の誤りビットを検出
するためのフラグシーケンス誤り検出回路と、フレーム
チェックシーケンスによるフレームの誤りを検出するた
めのフレーム誤り検出回路と、前記フラグシーケンス誤
り検出回路の誤り出力および前記フレーム誤り検出回路
の誤り出力の和を求めるための論理和回路と、前記論理
和回路の出力の和を計数するための誤り計数回路とを具
備して構成したことを特徴とする回線品質測定方式。
a flag sequence error detection circuit for detecting error bits on a flag sequence in a line that performs data communication according to a high-level data link control procedure; a frame error detection circuit for detecting frame errors according to a frame check sequence; An OR circuit for calculating the sum of the error output of the flag sequence error detection circuit and the error output of the frame error detection circuit, and an error counting circuit for counting the sum of the outputs of the OR circuit. A line quality measurement method that is characterized by:
JP27942589A 1989-10-25 1989-10-25 System for measuring line quality Pending JPH03139933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27942589A JPH03139933A (en) 1989-10-25 1989-10-25 System for measuring line quality

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27942589A JPH03139933A (en) 1989-10-25 1989-10-25 System for measuring line quality

Publications (1)

Publication Number Publication Date
JPH03139933A true JPH03139933A (en) 1991-06-14

Family

ID=17610901

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27942589A Pending JPH03139933A (en) 1989-10-25 1989-10-25 System for measuring line quality

Country Status (1)

Country Link
JP (1) JPH03139933A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6125265A (en) * 1997-05-23 2000-09-26 Matsushita Electric Industrial Co., Ltd. Portable telephone device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6125265A (en) * 1997-05-23 2000-09-26 Matsushita Electric Industrial Co., Ltd. Portable telephone device

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