JPH0616633B2 - Transmission line turnback detection method - Google Patents
Transmission line turnback detection methodInfo
- Publication number
- JPH0616633B2 JPH0616633B2 JP18650885A JP18650885A JPH0616633B2 JP H0616633 B2 JPH0616633 B2 JP H0616633B2 JP 18650885 A JP18650885 A JP 18650885A JP 18650885 A JP18650885 A JP 18650885A JP H0616633 B2 JPH0616633 B2 JP H0616633B2
- Authority
- JP
- Japan
- Prior art keywords
- code
- signal
- station
- detection method
- transmission 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 title claims description 11
- 230000005540 biological transmission Effects 0.000 title claims description 10
- 230000006854 communication Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 15
- 230000007175 bidirectional communication Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
- Dc Digital Transmission (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、複数の中継局が両端局間に主回線を介してそ
れぞれ接続され、双方向通信を行う双方向通信システム
における上記主回線の折り返しを検知する伝送路の折返
し検知方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to the above-mentioned main line in a two-way communication system in which a plurality of relay stations are respectively connected between both end stations via a main line and perform two-way communication. The present invention relates to a loopback detection method for a transmission line that detects loopback.
本発明は、複数の中継局が両端局間に主回線を介してそ
れぞれ接続され、双方向通信を行う双方向通信システム
における上記主回線の折り返しを検知する伝送路の折返
し検知方式において、 あらかじめ定められ２種類の符号のいずれか一方の符号
を発生し主信号に多重化して送出する符号送出手段と、
受信された上記多重化信号を分離して受信された符号が
上記あらかじめ定められた２種類の符号のいずれかであ
るかを検知する符号検知手段を設けることにより、 対向局および中継局において容易に折返しを検知できる
ようにしたものである。The present invention provides a loopback detection method of a transmission line for detecting loopback of the main line in a two-way communication system in which a plurality of relay stations are connected between both end stations via a main line respectively and perform two-way communication. Code transmitting means for generating one of the two types of codes, multiplexing it with the main signal, and transmitting it.
By providing the code detection means for separating the received multiplexed signal and detecting whether the received code is one of the predetermined two types of codes, the opposite station and the relay station can easily perform it. It is designed to be able to detect folding back.
光通信系においては、通常の双方向通信状態で主信号を
送出しているときに、伝送路の品質あるいは異常状態を
検出するために、対向する端局装置あるいは中間中継装
置において往信号路の信号を復信号路に折返し、一端よ
り伝送路品質を測定するという方法がとられる。このと
き、対向する端局装置からは通常の双方向通信状態と変
わらず同じ主信号が送られ続け、折り返し点において、
主信号とともに伝送される付加信号も同時に折返され
る。In an optical communication system, when transmitting a main signal in a normal two-way communication state, in order to detect the quality or abnormal state of the transmission line, the opposite terminal device or intermediate relay device may use the forward signal line. A method of returning the signal to the return signal path and measuring the quality of the transmission path from one end is used. At this time, the same main signal continues to be sent from the opposite terminal device as in the normal two-way communication state, and at the turning point,
The additional signal transmitted with the main signal is also returned at the same time.
上述した従来の方法で折返しを行った場合、折り返され
た信号は正常な信号形式をもった信号であるため、対向
局あるいは中間中継局においては、伝送路路が折返され
ていることを必ずしも検出できず、付加信号路を利用し
ている付帯装置は伝送路が異常状態になっていることを
知ることができない問題があった。When the loopback is performed by the above-described conventional method, the loopback signal is a signal having a normal signal format, and therefore it is not always detected that the transmission path is looped back at the opposite station or the intermediate relay station. However, there is a problem in that the auxiliary device using the additional signal path cannot know that the transmission path is in an abnormal state.
すなわち、第３図(a)に示す通常の通信状態において、
端局Ｗから折り返しが起動され、同図(b)に示すよう
に、端局Ｗからの信号および端局Ｅからの信号が中継局
(2)において同時に折り返されたとする。このとき、端
局Ｅおよび中継局(1)は中継局(2)で折り返された自局の
信号を正常信号として扱い、付帯装置へ送出する。この
ため付帯装置では、折り返された信号を正常信号として
誤認するという問題点があった。That is, in the normal communication state shown in FIG.
The loopback is started from the terminal station W, and the signal from the terminal station W and the signal from the terminal station E are transmitted to the relay station as shown in FIG.
It is assumed that they are turned back at the same time in (2). At this time, the terminal station E and the relay station (1) treat the signal of its own station returned by the relay station (2) as a normal signal and send it to the auxiliary device. Therefore, the accessory device has a problem that the folded signal is mistakenly recognized as a normal signal.
本発明の目的は、折返しが行われた場合、対向局あるい
は中間中継局において、容易に折返しを検知することの
できる伝送路の折返し検知方式を提供することにある。It is an object of the present invention to provide a loopback detection method for a transmission line, which can easily detect loopback at an opposite station or an intermediate relay station when loopback is performed.
本発明は、複数の中継局が両端局間に主回線を介してそ
れぞれ接続され、双方向通信を行う双方向通信システム
における上記主回線の折り返しを検知する伝送路の折返
し検知方式において、上記端局は、あらかじめ定められ
た２種類の符号のいずれか一方の符号であって対向する
端局とは異なる符号を発生し主信号に多重化して送出す
る符号送出手段を含み、上記端局または上記中継局は、
受信された上記多重化信号を分離して受信された符号が
上記あらかじめ定められた２種類の符号のいずれである
かを検知する符号検知手段を含むことを特徴とする。The present invention relates to a loopback detection method of a transmission line for detecting loopback of the main line in a two-way communication system in which a plurality of relay stations are respectively connected between both end stations via a main line and perform bidirectional communication. The station includes code transmitting means for generating one of two predetermined types of codes, which is different from the code of the opposite terminal station, and for multiplexing and transmitting the code to the main signal. Relay station
It is characterized by including code detection means for detecting whether the received code by separating the received multiplexed signal is one of the two predetermined codes.
本発明は、符号送出手段によりあらかじめ定められた２
種類の符号のいずれか一方の符号を主信号に多重化して
主回線に送出し、これを受信した各局では符号検知手段
により多重化信号を分離して、受信された符号が２種類
の符号のいずれかであるかを検知する。したがって、主
回線の折返しが行われると、通常時と復信号路あるいは
往信号路の符号が異なることになり、容易に折返しの検
知が可能となる。According to the present invention, the predetermined 2 is provided by the code sending means.
Any one of the codes of the types is multiplexed with the main signal and transmitted to the main line, and at each station that receives this, the code detection means separates the multiplexed signal so that the received code is of two types. Detect which one. Therefore, when the main line is folded back, the sign of the return signal path or the forward signal path is different from that of the normal time, and it is possible to easily detect the folding back.
以下、本発明について図面を参照して説明する。 Hereinafter, the present invention will be described with reference to the drawings.
第１図(a)、(b)は本発明の一実施例を示すブロック図
で、同図（Ａ）は符号送出手段、同図(B) は符号検知手
段を示す。第１図(a)において符号送出手段11は、主信
号入力端子１、付加信号入力端子２、符号ｗあるいは符
号ｅを発生する符号発生器３、および多重化信号出力端
子５にそれぞれ接続された主信号と付加信号と符号ｗあ
るいは符号ｅとを多重化する多重化手段４を含んでい
る。また、第１図(b)において、符号検知手段12は、主
信号出力端子６、付加信号出力端子７、符号検知器８お
よび多重化信号入力端子10にそれぞれ接続された主信号
と付加信号と符号ｗあるいは符号ｅとを分離する分離化
手段９を含んでいる。1 (a) and 1 (b) are block diagrams showing an embodiment of the present invention, in which FIG. 1 (A) shows a code sending means and FIG. 1 (B) shows a code detecting means. In FIG. 1 (a), the code sending means 11 is connected to the main signal input terminal 1, the additional signal input terminal 2, the code generator 3 for generating the code w or the code e, and the multiplexed signal output terminal 5, respectively. It includes a multiplexing means 4 for multiplexing the main signal, the additional signal and the code w or the code e. Further, in FIG. 1 (b), the code detecting means 12 includes a main signal and an additional signal respectively connected to the main signal output terminal 6, the additional signal output terminal 7, the code detector 8 and the multiplexed signal input terminal 10. It includes a separating means 9 for separating the code w or the code e.
本発明の特徴は、第１図(a)、(b)に示した符号送出手段
11と符号検知手段12とを設けたことにある。The feature of the present invention resides in the code transmitting means shown in FIGS. 1 (a) and 1 (b).
11 and the code detecting means 12 are provided.
第２図(a)、(b)は本発明の他の実施例を示す説明図で、
本発明を適用した双方向光通信における信号の流れを示
す。本発明による符号送出手段は端局Ｗおよび端局Ｅに
設置され、端局Ｗでは符号ｗが選ばれ、端局Ｅでは符号
ｅが選ばれる。そして本発明における符号検知手段は両
端局および各中継局に設置される。いま、回線が第２図
(a)に示すように通常の通信状態にあるものとする。こ
のとき、端局Ｗから端局Ｅに向かう通信路には、符号ｗ
が流れ、中継局(1)、中継局(2)、端局ＥのＷ→Ｅの受信
器では符号ｗを受信し、正常状態と判断する。端局Ｅか
ら端局Ｗに向かう通信路には符号ｅが流れ、端局Ｗ、中
継局(1)、中継局(2)のＥ→Ｗの受信器は符号ｅを受信
し、正常状態と判定することが可能となる。2 (a) and 2 (b) are explanatory views showing another embodiment of the present invention.
3 shows a signal flow in bidirectional optical communication to which the present invention is applied. The code transmitting means according to the present invention is installed in the terminal station W and the terminal station E, and the terminal station W selects the code w and the terminal station E selects the code e. The code detecting means in the present invention is installed in both end stations and each relay station. The line is now in Figure 2.
It is assumed that the communication is in a normal state as shown in (a). At this time, the communication path from the terminal station W to the terminal station E has a code w
, The relay station (1), the relay station (2), and the W → E receiver of the terminal station E receive the code w and judge that the state is normal. The code e flows in the communication path from the terminal station E to the terminal station W, and the E → W receivers of the terminal station W, the relay station (1) and the relay station (2) receive the code e, and the normal state is established. It becomes possible to judge.
次に第２図(b)に示すように中継(2)で主回線が折返され
たとする。このとき端局Ｗ、中継局(1)のＥ→Ｗの受信
器は符号ｗを受信する。これは正常時の符号ｅとは異な
るため、端局Ｗ、中継局(1)では通話路が折返されてい
ることを知ることができる。端局Ｅにおいても同様に、
Ｗ→Ｅの通話路において正常時とは異なる符号ｅを受信
するために、通話路が折返されていることを知ることが
できる。この場合、第１図(a)における符号発生器３か
ら発生される符号は、上記のように、相異る符号ｗまた
は符号ｅのいずれかを発生する。符号の例としては、例
えばｗを「…、１、１、１、…」、ｅを「…０、０、
０、…」のように選ぶことができる。Next, it is assumed that the main line is returned by the relay (2) as shown in FIG. 2 (b). At this time, the terminal W and the E → W receiver of the relay station (1) receive the code w. Since this is different from the code e in the normal state, it is possible to know that the terminal W and the relay station (1) are returning the communication path. Similarly at the terminal station E,
Since the code e different from the normal state is received in the W → E speech path, it can be known that the speech path is turned back. In this case, the code generated by the code generator 3 in FIG. 1 (a) generates either the different code w or code e as described above. As an example of the code, for example, w is “... 1, 1, 1, ...”, e is “... 0, 0,
0, ... ”can be selected.
以上説明したように、本発明は、双方向通話路のそれぞ
れに、相異る２種類の符号ｗ、ｅを主信号に付加するこ
とにより折返しを検出することを可能にする効果があ
る。したがって、本発明は、主信号に付加して伝送され
る付加信号伝送路に、折返しを報知する手段を与える上
で極めて有用である。As described above, the present invention has an effect that it is possible to detect aliasing by adding two different types of codes w and e to the main signal for each of the two-way speech paths. Therefore, the present invention is extremely useful in providing an additional signal transmission line that is added to the main signal and is transmitted, with means for informing the return.
第１図(a)、(b)は本発明一実施例を示すブロック図。 第２図(a)、(b)は本発明の他の実施例を示す説明図。 第３図(a)、(b)は従来例を示す説明図。 １……主信号入力端子、２……付加信号入力端子、３…
…符号発生器、４……多重化手段、５……多重化信号出
力端子、６……主信号出力端子、７……付加信号出力端
子、８……符号検知器、９……分離化手段、10……多重
化信号入力端子、11……符号送出手段、12……符号検知
手段、ｅ、ｗ……符号。1 (a) and 1 (b) are block diagrams showing an embodiment of the present invention. 2 (a) and 2 (b) are explanatory views showing another embodiment of the present invention. 3 (a) and 3 (b) are explanatory views showing a conventional example. 1 ... Main signal input terminal, 2 ... Additional signal input terminal, 3 ...
.. code generator, 4 ... multiplexing means, 5 ... multiplexed signal output terminal, 6 ... main signal output terminal, 7 ... additional signal output terminal, 8 ... code detector, 9 ... demultiplexing means , 10 ... multiplexed signal input terminal, 11 ... code sending means, 12 ... code detecting means, e, w ... code.
Claims (1)
それぞれ接続され、双方向通信を行う双方向通信システ
ムにおける上記主回線の折り返しを検知する伝送路の折
返し検知方式において、 上記端局は、あらかじめ定められた２種類の符号のいず
れか一方の符号であって対向する端局とは異なる符号を
発生し主信号に多重化して送出する符号送出手段を含
み、 上記端局または上記中継局は、受信された上記多重化信
号を分離して受信された符号が上記あらかじめ定められ
た２種類の符号のいずれであるかを検知する符号検知手
段を含む ことを特徴とする伝送路の折返し検知方式。1. A transmission line turn-back detection method for detecting turn-back of the main line in a two-way communication system in which a plurality of relay stations are connected between both end stations via a main line respectively and bidirectional communication is performed. The terminal station includes code transmitting means for generating one of two predetermined codes, which is different from the code of the opposite terminal station, and for multiplexing and transmitting the code to the main signal. The relay station includes code detection means for detecting whether the received code is a code received by separating the received multiplexed signal. Return detection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18650885A JPH0616633B2 (en) | 1985-08-23 | 1985-08-23 | Transmission line turnback detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18650885A JPH0616633B2 (en) | 1985-08-23 | 1985-08-23 | Transmission line turnback detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6247247A JPS6247247A (en) | 1987-02-28 |
| JPH0616633B2 true JPH0616633B2 (en) | 1994-03-02 |
Family
ID=16189724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18650885A Expired - Lifetime JPH0616633B2 (en) | 1985-08-23 | 1985-08-23 | Transmission line turnback detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616633B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5928097A (en) * | 1982-08-06 | 1984-02-14 | Matsushita Electric Ind Co Ltd | Blower |
-
1985
- 1985-08-23 JP JP18650885A patent/JPH0616633B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6247247A (en) | 1987-02-28 |
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