JPS639244A - Loopback identification system in digital line - Google Patents

Loopback identification system in digital line

Info

Publication number
JPS639244A
JPS639244A JP61151700A JP15170086A JPS639244A JP S639244 A JPS639244 A JP S639244A JP 61151700 A JP61151700 A JP 61151700A JP 15170086 A JP15170086 A JP 15170086A JP S639244 A JPS639244 A JP S639244A
Authority
JP
Japan
Prior art keywords
loopback
frame synchronization
station
pattern
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.)
Granted
Application number
JP61151700A
Other languages
Japanese (ja)
Other versions
JP2655597B2 (en
Inventor
Yukihiko Shimizu
幸彦 清水
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 JP61151700A priority Critical patent/JP2655597B2/en
Publication of JPS639244A publication Critical patent/JPS639244A/en
Application granted granted Critical
Publication of JP2655597B2 publication Critical patent/JP2655597B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Time-Division Multiplex Systems (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To facilitate the maintenance of a line and fault restoration or the like by using two kinds of different frame synchronizing patterns for an incoming line and an outgoing line so as to easily identify the loopback state without using any special loopback signal. CONSTITUTION:Frame synchronizing signals with different patterns '0001' and '1110' are used in the incoming line 114 and the outgoing line 114 between an A station 101 and a B station 102 switches 111, 112 of the B station 102 are operated and a signal having a frame synchronizing pattern '1110' sent from the station A is subject to loopback and inputted to two frame synchronizing Signal detection circuits 104, 105 of the A station 101. the circuit 104 detects the pattern '1110' to recognize the loopback state. That is, since the frame synchronizing pattern of the incoming line 114 is '0001' the loopback state is easily identified.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、フレーム同期方式のディジタル回線の保守、
障害復旧等に使用されるループバックの識別方式に関す
る。
[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to the maintenance of frame-synchronized digital lines;
This invention relates to a loopback identification method used for failure recovery, etc.

〔従来の技術〕[Conventional technology]

従来のフレーム同期方式のディジタル回線において、保
守、障害復旧等のために行われるループバックについて
、ディジタル回線を示す第2図を用いて説明を行う。A
局201及び8局202にはそれぞれ送信側フレーム同
期信号挿入回路203,204、フレーム同期信号検出
回路205,206 、ループ八ツク用スイッチ207
.208.209.210が設けられており、A局20
1 と8局202とは下り回線211 と上り回線21
2とによって接続されている。そして、上り回線212
と下り回線211においては同一のフレーム同期パター
ン、例えば“0101”が用いられる。
Loopback performed for maintenance, failure recovery, etc. in a conventional frame-synchronized digital line will be explained with reference to FIG. 2, which shows a digital line. A
The stations 201 and 8 stations 202 have transmitting side frame synchronization signal insertion circuits 203 and 204, frame synchronization signal detection circuits 205 and 206, and a loop eight switch 207, respectively.
.. 208.209.210 is established, and A station 20
1 and 8 station 202 are downlink 211 and uplink 21
It is connected by 2. And up line 212
The same frame synchronization pattern, for example "0101", is used in the downlink 211.

仮に8局202のスイッチ209,210を動作させて
ループバックを行ったとする。このときA局201から
発信された” 0101”のフlく−ム同期パターンを
持つ信号はループバックし、A局201のフレーム同期
信号検出回路205において“” 0101”のフレー
ム同期パターンが検出される。しかし、このフレーム同
期パターンは通常の通信状態においても用いられるため
、この信号がループバックによるものか通常の通信によ
るものかを識別することはできない。
Assume that the switches 209 and 210 of the eight stations 202 are operated to perform loopback. At this time, the signal having the frame synchronization pattern of "0101" transmitted from the A station 201 is looped back, and the frame synchronization pattern of "0101" is detected in the frame synchronization signal detection circuit 205 of the A station 201. However, since this frame synchronization pattern is also used in normal communication conditions, it is not possible to identify whether this signal is due to loopback or normal communication.

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

このように、従来のフレーム同期方式のディジタル回線
では、上り回線と下り回線に同一のフレーム同期パター
ンが使用されているため、A局またはB局において回線
のループバックが行われ、フレーム同期信号検出回路が
フレーム同期信号を検出してもループバック信号を回線
上に送出しない限り、ループバック状態か通常の通信状
態かの判定は不可能である。
In this way, in conventional frame synchronization digital lines, the same frame synchronization pattern is used for uplinks and downlinks, so line loopback is performed at station A or B, and frame synchronization signal detection is performed. Even if the circuit detects a frame synchronization signal, it is impossible to determine whether the circuit is in a loopback state or a normal communication state unless it sends a loopback signal onto the line.

本発明の目的はこの欠点を解消し、フレーム同期信号を
検出するだけでループバック状態の判定を可能とするフ
レーム同期方式のディジタル回線におけるループバック
識別方式を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to eliminate this drawback and provide a loopback identification method for a frame-synchronized digital line, which makes it possible to determine a loopback state simply by detecting a frame-synchronized signal.

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

本発明のループバック識別方式は、フレーム同期方式の
ディジタル回線において、上り回線と下り回線にそれぞ
れ別のフレーム同期パターンを与え、ループバック時に
通常の通信状態とは異なったフレーム同期パターンを検
出し、ループバック状態か否かを識別することを特徴と
する。
The loopback identification method of the present invention provides different frame synchronization patterns to uplink and downlink in a frame synchronization digital line, and detects a frame synchronization pattern different from the normal communication state during loopback, It is characterized by identifying whether or not it is in a loopback state.

〔実施例〕〔Example〕

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、本発明の一実施例にもとづくフレーム同期方
式のディジタル回線を示すブロック図である。
FIG. 1 is a block diagram showing a frame-synchronized digital line according to an embodiment of the present invention.

第1図において、A局101には送信側に“” 111
0”というパターンのフレーム同期信号を挿入するフレ
ーム同期信号挿入回路103、受信側に”1110”及
びu000ピというパターンのフレーム同期信号をそれ
ぞれ検出するフレーム同期信号検出回路104.105
 、ループバック用スイッチ109.110が設けられ
ている。一方、8局102には送信側に“0001”と
いうパターンのフレーム同期信号を挿入するフレーム同
期信号挿入回路108、受信側にパ1110”及び“0
001”というパターンのフレーム同期信号をそれぞれ
検出するフレーム同期信号検出回路106,107 、
ループバンク用スイッチ11L112が設けられている
。そして、A局101 と8局102とは下り回線11
3と上り回線114にて接続されている。
In FIG. 1, the A station 101 has “” 111 on the transmitting side.
A frame synchronization signal insertion circuit 103 that inserts a frame synchronization signal with a pattern of "0", and frame synchronization signal detection circuits 104 and 105 that detect frame synchronization signals with patterns of "1110" and u000 pi on the receiving side, respectively.
, loopback switches 109 and 110 are provided. On the other hand, in the 8th station 102, a frame synchronization signal insertion circuit 108 inserts a frame synchronization signal with a pattern of "0001" on the transmitting side, and a frame synchronization signal insertion circuit 108 with a pattern of "0001" on the receiving side, and
frame synchronization signal detection circuits 106 and 107 that respectively detect frame synchronization signals having a pattern of "001";
A loop bank switch 11L112 is provided. The A station 101 and the 8th station 102 are the downlink 11
3 through an uplink 114.

このディジタル回線においてループバックは次のように
実施される。仮に8局102のスイッチ111.112
が動作し、A局101から発信された“1110”のフ
レーム同期パターンを持つ信号がループバックしてA局
101の2つのフレーム同期信号検出回路104,10
5に入力されたとすると、フレーム同期信号検出回路1
04が“1110”を検出し、ループバック状態を認識
する。即ち通常通信状態では、上り回線114のフレー
ム同期パターンは“0001”であるので容易にループ
バック状態が識別可能である。
Loopback is implemented in this digital line as follows. Suppose that switches 111 and 112 of 8 stations 102
operates, and a signal with a frame synchronization pattern of "1110" transmitted from the A station 101 is looped back and detected by the two frame synchronization signal detection circuits 104 and 10 of the A station 101.
5, frame synchronization signal detection circuit 1
04 detects "1110" and recognizes the loopback state. That is, in the normal communication state, the frame synchronization pattern of the uplink 114 is "0001", so the loopback state can be easily identified.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明のフレーム同期方式のディ
ジタル回線におけるループバ・ツク識別方式によれば2
種の異なったフレーム同期パターンを上り回線と下り回
線に使用する事により、特別なループバック信号を用い
ることなく、容易にループバック状態を識別できるとい
う効果がある。
As explained above, according to the loopback identification method for frame synchronized digital lines of the present invention, two
By using different types of frame synchronization patterns for uplink and downlink, there is an effect that a loopback state can be easily identified without using a special loopback signal.

従って、ループバックを用いたディジタル回線の保守、
障害復旧等を容易に行うことが可能となる。
Therefore, maintenance of digital lines using loopback,
It becomes possible to easily perform failure recovery, etc.

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

第1図は本発明の一実施例を説明するためのフレーム同
期方式のディジタル回線のブロック図、第2図は従来の
フレーム同期方式のディジクル回線のブロック図である
。 101.201 ・・・・・・・・A局102.202
・・・・・・・・8局 103.108,203,204  ・・・・フレーム
同期信号挿入回路 104〜107,205,206 ・・・フレーム同期
信号検出回路
FIG. 1 is a block diagram of a frame-synchronized digital line for explaining an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional frame-synchronized digital line. 101.201 ・・・・・・・・・A station 102.202
...8 stations 103, 108, 203, 204 ... Frame synchronization signal insertion circuits 104 to 107, 205, 206 ... Frame synchronization signal detection circuit

Claims (1)

【特許請求の範囲】[Claims] (1)フレーム同期方式のディジタル回線において、上
り回線と下り回線にそれぞれ別のフレーム同期パターン
を与え、ループバック時に通常の通信状態とは異なった
フレーム同期パターンを検出し、ループバック状態か否
かを識別することを特徴とするディジタル回線における
ループバック識別方式。
(1) In a frame synchronization digital line, separate frame synchronization patterns are given to the uplink and downlink, and at loopback, a frame synchronization pattern different from the normal communication state is detected, and whether or not the loopback state is detected. A loopback identification method for digital lines characterized by identifying.
JP61151700A 1986-06-30 1986-06-30 Loopback identification method for digital circuits Expired - Lifetime JP2655597B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61151700A JP2655597B2 (en) 1986-06-30 1986-06-30 Loopback identification method for digital circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61151700A JP2655597B2 (en) 1986-06-30 1986-06-30 Loopback identification method for digital circuits

Publications (2)

Publication Number Publication Date
JPS639244A true JPS639244A (en) 1988-01-14
JP2655597B2 JP2655597B2 (en) 1997-09-24

Family

ID=15524352

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61151700A Expired - Lifetime JP2655597B2 (en) 1986-06-30 1986-06-30 Loopback identification method for digital circuits

Country Status (1)

Country Link
JP (1) JP2655597B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996036147A1 (en) * 1995-05-11 1996-11-14 Newbridge Networks Corporation Detection of loop-back conditions on faulty digital trunks
US7889195B2 (en) 1998-07-17 2011-02-15 Sensable Technologies, Inc. Systems and methods for sculpting virtual objects in a haptic virtual reality environment
US7990374B2 (en) 2004-06-29 2011-08-02 Sensable Technologies, Inc. Apparatus and methods for haptic rendering using data in a graphics pipeline
JP2016086258A (en) * 2014-10-24 2016-05-19 京セラドキュメントソリューションズ株式会社 Data communication device and image forming apparatus with the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55107753U (en) * 1979-01-24 1980-07-28
JPS58105654A (en) * 1981-12-18 1983-06-23 Fujitsu Ltd Detecting system for line state

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55107753U (en) * 1979-01-24 1980-07-28
JPS58105654A (en) * 1981-12-18 1983-06-23 Fujitsu Ltd Detecting system for line state

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996036147A1 (en) * 1995-05-11 1996-11-14 Newbridge Networks Corporation Detection of loop-back conditions on faulty digital trunks
US7889195B2 (en) 1998-07-17 2011-02-15 Sensable Technologies, Inc. Systems and methods for sculpting virtual objects in a haptic virtual reality environment
US7990374B2 (en) 2004-06-29 2011-08-02 Sensable Technologies, Inc. Apparatus and methods for haptic rendering using data in a graphics pipeline
JP2016086258A (en) * 2014-10-24 2016-05-19 京セラドキュメントソリューションズ株式会社 Data communication device and image forming apparatus with the same

Also Published As

Publication number Publication date
JP2655597B2 (en) 1997-09-24

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