JPS6194428A - Error detecting circuit - Google Patents

Error detecting circuit

Info

Publication number
JPS6194428A
JPS6194428A JP21562884A JP21562884A JPS6194428A JP S6194428 A JPS6194428 A JP S6194428A JP 21562884 A JP21562884 A JP 21562884A JP 21562884 A JP21562884 A JP 21562884A JP S6194428 A JPS6194428 A JP S6194428A
Authority
JP
Japan
Prior art keywords
rds
integrator
bit
error
input signal
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
JP21562884A
Other languages
Japanese (ja)
Inventor
Yasuhiro Fujinobe
藤延 康裕
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 JP21562884A priority Critical patent/JPS6194428A/en
Publication of JPS6194428A publication Critical patent/JPS6194428A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/24Testing correct operation
    • H04L1/245Testing correct operation by using the properties of transmission codes
    • H04L1/246Testing correct operation by using the properties of transmission codes two-level transmission codes, e.g. binary

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To easily detect an error of a digital signal which is inputted at a high transmission speed by providing a two-bit integrator which calculates the sum of two-bit DC components of the code sequence of the input signal at the input side of an integrator for the sum of DC components of the code sequence. CONSTITUTION:The two-bit integrator 5 section the code sequence of the input signal 1 by two bits and integrates two-bit DC components. Then, an RDS integrator 2 further integrates integral values of every two bits obtained by the integrator 5 to calculate the sum RDS of DC components of the code sequence of the input signal 1. Feedback is provided through a signal line 6 for this sequential counting operation. An RD detection part 3 judges whether the RDS integrated by two bits at a time is within a normal range or not, and sends out an error pulse 4 and returns the RDS to a boundary value through a signal line 7 when the RDS is not within the normal range. Then, such a misjudgement that there is no error is prevented from being made by an inspec tion part with information from a signal line 8.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ディジタル伝送装置等で伝送路エラーを監視
するために受信部に設けられるエラー検出回路に関し、
特に後述のmBnB符号を使用したディジタル伝送装置
において、符号列の直流分の和(Running Di
gital Sum、  以下、[RDS Jと略す。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an error detection circuit provided in a receiving section for monitoring transmission path errors in a digital transmission device, etc.
In particular, in digital transmission equipment using mBnB codes, which will be described later, the sum of the DC components of the code string (Running Di
digital Sum, hereinafter abbreviated as [RDS J].

)をカウントすることにより、RDSが入力信号の符号
列の構成によって定められ・る範囲内にあるか否かを判
定することにより、入力信号のエラーを検出するエラー
検出回路に関する。
The present invention relates to an error detection circuit that detects an error in an input signal by counting the RDS and determining whether or not the RDS is within a range determined by the configuration of the code string of the input signal.

〔従来の技術〕[Conventional technology]

まず、前述のmBnB符号について説明する。この符号
は、情報mビットとこれに続く1ビットの合計nビット
の符号であって、符号「1」と符号「0」とが同程度の
割合で出現し符号rlJが極端に多く継続したり符号「
0」が極端に多く継続したりすることのないように構成
された符号である。
First, the aforementioned mBnB code will be explained. This code is a code with a total of n bits, consisting of m bits of information and 1 bit following this, and the code "1" and the code "0" appear at the same rate, and the code rlJ continues extremely frequently. The code “
This code is constructed so that an extremely large number of 0's do not continue.

たとえば、9BIOB符号を使用したディジタル装置の
場合、符号「1」を+0.5とし符号「釦を−0,6と
毛てRDSを求めたとき、RDSは−2,5〜+2.5
の範囲内にある。従って、RDSがこの範囲外になった
とぎは、入力信号のエラーどして検出することができる
For example, in the case of a digital device that uses the 9BIOB code, when the code ``1'' is +0.5 and the code ``button is pressed -0,6'' to obtain the RDS, the RDS is -2,5 to +2.5.
is within the range of Therefore, when the RDS falls outside this range, it can be detected as an error in the input signal.

従来、この種のエラー検出回路は、例えば第2図に示す
ように、RDSを求めるRDS積算器2と、RDSエラ
ー検出部8とで構成されている。
Conventionally, this type of error detection circuit is comprised of an RDS integrator 2 for calculating RDS and an RDS error detection section 8, as shown in FIG. 2, for example.

RDS積算器2では、入力信号1の符号列の直流分を、
順次積算し、RDSを求める。信号線6は、この順次積
算していくためのフィードバック線である。RDSエラ
ー検出部8はそのカウントされたRDSが所定の正常な
範囲内にあるかどうかを判断し、正常な範囲内にあると
きはそのままとし、範囲外のときはエラーパルス4を送
出する。RDSエラー検出部8からRDS a算器2へ
信号を送る信号線7は、RDSが一度正常範囲をこえた
とき、このこえた境界値のRDSをそのままとしないで
、エラーパルス4が送出されると同時にRDSを境界値
にまで戻す動作をするための信号線である。
In the RDS integrator 2, the DC component of the code string of the input signal 1 is
Sequential integration is performed to obtain RDS. The signal line 6 is a feedback line for this sequential integration. The RDS error detection unit 8 determines whether the counted RDS is within a predetermined normal range, and if it is within the normal range, it is left as is, and if it is outside the range, it sends out an error pulse 4. The signal line 7 that sends a signal from the RDS error detection unit 8 to the RDS a calculator 2 is such that when the RDS once exceeds the normal range, the error pulse 4 is sent without leaving the RDS of the exceeded boundary value as it is. At the same time, this is a signal line for returning the RDS to the boundary value.

このようなエラー検出回路は、低速ビットレイト(50
Mb/s  程度以下)では遅延量が問題とならないが
、100 Mb/s程度の高速ビットレイトになると、
遅延量が1タイムスロツトの周期を越え回路が実現不能
となる。これ以上の高速のICではカクンターなどMS
I(中規模集積回路)が供給されておらず、ゲートを組
合せての回路実現は、かえって複雑になってしまう。
Such an error detection circuit is suitable for low bit rates (50
At bit rates below about 100 Mb/s, the amount of delay is not a problem, but when it comes to high-speed bit rates of about 100 Mb/s,
If the amount of delay exceeds the period of one time slot, the circuit becomes unrealizable. For higher speed ICs, MS such as Kakunta
I (medium scale integrated circuit) is not provided, and realizing a circuit by combining gates becomes rather complicated.

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

上述した従来のエラー検出回路は、100 Mb/s程
度の高速度で伝送しようとする場合に、遅延量が1タイ
ムスロツトの周期をこえるので、回路の実現ができない
という欠点がある。
The above-mentioned conventional error detection circuit has a drawback in that it cannot be implemented when transmitting at a high speed of about 100 Mb/s because the amount of delay exceeds the cycle of one time slot.

本発明の目的は、例えば50 Mb/sをこえる高速の
伝送速度で入力するディジタル信号に対しても、MSI
を使用して簡単な回路で実現できるエラー検出回路を提
供することである。
An object of the present invention is to provide MSI even for digital signals input at high transmission speeds exceeding, for example, 50 Mb/s.
An object of the present invention is to provide an error detection circuit that can be realized with a simple circuit using.

〔問題点を解決するだめの手段〕[Failure to solve the problem]

本発明によるエラー検出回路は、従来のエラー検出回路
におけるRDS積算器の入力側に、入力信号の符号列の
2ビットずつについての直流分の和をカウントする2ビ
ット積算器を有する。
The error detection circuit according to the present invention has a 2-bit integrator on the input side of the RDS integrator in the conventional error detection circuit, which counts the sum of DC components for each 2 bits of the code string of the input signal.

〔実施例〕〔Example〕

次に、本発明の実施例について図面を参照して説明する
Next, embodiments of the present invention will be described with reference to the drawings.

第1図は、本発明によるエラー検出回路の一実施例を示
すブロック図で2ビット積算器5と、RDS積算器2と
、RDSエラー検出部8からなる。
FIG. 1 is a block diagram showing one embodiment of an error detection circuit according to the present invention, which includes a 2-bit integrator 5, an RDS integrator 2, and an RDS error detection section 8.

2ビット積算器5は、入力信号1の符号列を2ピツトス
つ区切り、その2ビットずつについての直流分の積算を
行なう。
The 2-bit integrator 5 divides the code string of the input signal 1 into 2 pits and integrates the DC component for each 2 bits.

つぎに、RDS積算器2では、2ビット積算器5での2
ビットごとの積算値をさらに順次積算することにより入
力信号1のRDSを求める。信号線6は、この順次カウ
ントしていくだめのフィードバック線である。
Next, in the RDS integrator 2, the 2 bits in the 2-bit integrator 5
The RDS of input signal 1 is determined by further sequentially integrating the integrated values for each bit. The signal line 6 is a feedback line for this sequential counting.

さらに、RDSエラー検出部8では、このように2ビッ
トずつまとめて積算したRDSが正常な範囲内゛にある
かどうかを判断し、範囲外のときはエラーパルス4を送
出する。信号線7はエラー出力となってエラーパルス4
が送出されたとき、これと同時にRDSを境界値にまで
戻すための信号線である。
Further, the RDS error detection unit 8 determines whether the RDS accumulated in two bits at a time is within a normal range, and sends out an error pulse 4 if it is outside the range. Signal line 7 becomes error output and error pulse 4
This is a signal line for returning the RDS to the boundary value at the same time when the RDS is sent out.

つぎに、信号線80機能を説明する。たとえば入力信号
が9B10B信号であってRDSが境界値+2.5に達
して、その次の入力信号の2ビットが[1,OJである
場合に、エラー検出部8は、信号線8からのこの[1,
OJであるという情報を2ビット積算器5から受信する
のでエラーがあることを検出できる。信号線8を経由し
ての情報によってRDSエラー検出部8がエラーがない
という誤った判断をすることになるのを防ぐことができ
る。
Next, the function of the signal line 80 will be explained. For example, when the input signal is a 9B10B signal and RDS reaches the boundary value +2.5, and the next 2 bits of the input signal are [1, OJ, the error detection unit 8 detects this signal from the signal line 8. [1,
Since the information that it is OJ is received from the 2-bit integrator 5, it is possible to detect that there is an error. It is possible to prevent the RDS error detection unit 8 from incorrectly determining that there is no error based on the information via the signal line 8.

以上説明したように本発明によれば、2ビットずつまと
めて処理するために、データの速度が半分で済み、2倍
の遅延量が許されることになる。
As explained above, according to the present invention, since data is processed in batches of 2 bits at a time, the data speed can be halved and twice the amount of delay is allowed.

このため、100 Mb/s程度の高速なものについて
も、遅延量が1タイムスロツトの周期未満となり、MS
Iを使用した簡単な回路によりエラー検出回路を実現で
きる。
Therefore, even for high-speed devices of about 100 Mb/s, the amount of delay is less than the period of one time slot, and the MS
An error detection circuit can be realized by a simple circuit using I.

2ビットa算器5の入力側にさらに2ビット積算器を接
続することにより、ZOOMb/s程度の伝送速度で入
力する信号のエラーを検出できる。
By further connecting a 2-bit multiplier to the input side of the 2-bit a multiplier 5, errors in the input signal can be detected at a transmission speed of about ZOOMb/s.

〔発明の効果〕〔Effect of the invention〕

本発明のエラー検出回路により、例えば50Mb/sを
こえる高速の伝送速度で入力するディジタル信号のエラ
ーの検出を、MSIを使用した簡単な回路により実現で
きる効果がある。
The error detection circuit of the present invention has the advantage of being able to detect errors in digital signals input at high transmission speeds exceeding, for example, 50 Mb/s with a simple circuit using MSI.

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

第1図は、本発明によるエラー検出回路の一実施例を示
すブロック図、第2図は、エラー検出回路の従来例を示
すブロック図である。 ■・・・・・・入力信号、   2・・・・・・RDS
積算器。 8・・・・・・RDSエラー検出部、 4・・・・・・
エラーパルス出力。 5・・・・・・2ピツト積算器。 第1図 第2図
FIG. 1 is a block diagram showing an embodiment of an error detection circuit according to the present invention, and FIG. 2 is a block diagram showing a conventional example of an error detection circuit. ■・・・Input signal, 2・・・RDS
Totalizer. 8...RDS error detection section, 4...
Error pulse output. 5...2 pit integrator. Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] ディジタル伝送装置の受信部に設けられ、入力信号の符
号列の直流分を順次カウントしてその和を求める積算器
と、該直流分の和が入力信号の符号列の構成によつて定
められる正常値の範囲内にあるか否かを判定して受信し
た入力信号のエラーを検出するエラー検出部からなるエ
ラー検出回路において、前記積算器の入力側に、入力信
号の符号列の2ビットずつについての直流分の和をカウ
ントする2ビット積算器を備えることを特徴とするエラ
ー検出回路。
An integrator installed in the receiving section of a digital transmission device that sequentially counts the DC components of the code string of the input signal and calculates the sum; In an error detection circuit comprising an error detection section that detects an error in a received input signal by determining whether or not the value is within a value range, an error detection circuit is provided on the input side of the integrator for each 2 bits of the code string of the input signal. An error detection circuit comprising a 2-bit integrator that counts the sum of DC components.
JP21562884A 1984-10-15 1984-10-15 Error detecting circuit Pending JPS6194428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21562884A JPS6194428A (en) 1984-10-15 1984-10-15 Error detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21562884A JPS6194428A (en) 1984-10-15 1984-10-15 Error detecting circuit

Publications (1)

Publication Number Publication Date
JPS6194428A true JPS6194428A (en) 1986-05-13

Family

ID=16675548

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21562884A Pending JPS6194428A (en) 1984-10-15 1984-10-15 Error detecting circuit

Country Status (1)

Country Link
JP (1) JPS6194428A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011041107A (en) * 2009-08-14 2011-02-24 Anritsu Corp Test system and test method of device for mobile communication

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57171859A (en) * 1981-04-16 1982-10-22 Fujitsu Ltd Code error detecting system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57171859A (en) * 1981-04-16 1982-10-22 Fujitsu Ltd Code error detecting system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011041107A (en) * 2009-08-14 2011-02-24 Anritsu Corp Test system and test method of device for mobile communication

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