JPH03112240A - Line fault detecting method - Google Patents
Line fault detecting methodInfo
- Publication number
- JPH03112240A JPH03112240A JP1249676A JP24967689A JPH03112240A JP H03112240 A JPH03112240 A JP H03112240A JP 1249676 A JP1249676 A JP 1249676A JP 24967689 A JP24967689 A JP 24967689A JP H03112240 A JPH03112240 A JP H03112240A
- Authority
- JP
- Japan
- Prior art keywords
- repeater
- input signal
- optical
- overhead
- optical terminal
- 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.)
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Links
- 238000000034 method Methods 0.000 title description 3
- 230000003287 optical effect Effects 0.000 claims abstract description 114
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000000284 extract Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 239000004306 orthophenyl phenol Substances 0.000 description 1
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
- Time-Division Multiplex Systems (AREA)
- Dc Digital Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
データにオーバヘッドビットを付加して送信する送信側
光端局中継器と、
該送信側光端局中継器と光伝送路で接続された、オーバ
ヘンドビンＩ−を取り出し、必要なオーバヘッドビット
を付加して送信する光中間中継器と、該光中間中継器と
光伝送路で接続された、オーハヘッドビットを取り出す
受信側光端局中継器にて構成される光伝送システムの回
線障害検出方法に関し、
光伝送システムとして回路規模が小さくて、且つ受信側
光端局中継器で、送信側光端局中継器にて入力信号断を
検出したか、光中間中継器にて入力信号断又は同期はず
れを検出したかの分離が出来る回線障害検出方法の捉供
を目的とし、送信側光端局中継器では入力信号断を検出
すると、オーバヘッドビット入力部（以下ＯＨ入力部と
称す）にて、第１の空きオーバヘッドビット領域に所定
の符号を挿入して送信し、
該光中間中継器では、入力信号断又は同期はずれを検出
すると、ＯＨ入力部にて、第２の空きオーバヘッドビッ
ト領域に所定の符号を挿入して送信し、
該受信測光端局中継器ではオーバヘッドビット出力部（
以下ＯＨ出力部と称す）より出力した該第１の空きオー
バヘッドピッ）ｆｉＪｔ域及び該第２の空きオーバヘッ
ドビット領域に所定の符号が挿入されているかどうかで
、該送信側光端局中継器にて入力信号断を検出したか、
該光中間中継器にて入力信号断又は゛同期はずれを検出
したかを検出するように構成する。[Detailed Description of the Invention] [Summary] A transmitting optical terminal station repeater that adds overhead bits to data and transmits the data; and an overhead bin connected to the transmitting optical terminal station repeater via an optical transmission line. Consists of an optical intermediate repeater that extracts I-, adds necessary overhead bits, and transmits it, and a receiving-side optical terminal repeater that extracts the OHA head bit, which is connected to the optical intermediate repeater via an optical transmission line. Regarding the method for detecting line failures in optical transmission systems that are The aim is to provide a line failure detection method that can separate whether an input signal disconnection or synchronization is detected at an intermediate repeater. At the OH input section (hereinafter referred to as the OH input section), a predetermined code is inserted into the first empty overhead bit area and transmitted. , a predetermined code is inserted into the second empty overhead bit area and transmitted, and the receiving photometering terminal station repeater outputs an overhead bit (
Depending on whether a predetermined code is inserted into the fiJt area and the second empty overhead bit area output from the first free overhead bit area (hereinafter referred to as OH output section), the transmission side optical terminal repeater Did you detect an input signal disconnection?
The optical intermediate repeater is configured to detect whether input signal disconnection or loss of synchronization is detected.
本発明は、データにオーバへ・ンドビソトを付７Ｊｎし
て送信する送信側光端局中継器と、
該送信側光端局中継器と光伝送路で接続された、オーバ
ヘッドビットを取り出し、必要なオーバヘットビットを
付加して送信する光中間中継朱：と、該光中間中継器と
光伝送路で接続された、オーバヘッドビットを取り出す
受信側光端局中継器にて構成される光伝送システムの、
回線障害検出方法の改良に関する。The present invention includes a transmission-side optical terminal station repeater that appends an overwrite mark to data and transmits the data, and a transmission-side optical terminal station connected to the transmission-side optical terminal station repeater via an optical transmission line. An optical transmission system consisting of an optical intermediate repeater that adds and transmits overhead bits, and a receiving-side optical terminal repeater that extracts the overhead bits and is connected to the optical intermediate repeater via an optical transmission line. ,
Related to improvements in line fault detection methods.
第３図は従来例の光伝送システムのブロック図である。 FIG. 3 is a block diagram of a conventional optical transmission system.
第３図の送信側光端局中継器１゛では、入力インターフ
ェース部１０に入力する直列信号を直並列変換回路（以
下Ｓ／Ｐと称す）１１にて並列信号に変換し、光伝送路
４０への出力信号の１とＯの数を略等しくなるように符
号変換する符号変換部１２に入力する。In the transmitting side optical terminal repeater 1'' shown in FIG. The output signal is input to a code converter 12 which converts the code so that the numbers of 1's and O's in the output signal are approximately equal.
符号変換部１２では、ＯＨ入力部４よりフレームビット
等のオーバヘッドビットが入力しており、２Ｂ４Ｂ変換
の例で説明すると、データ２ビツトに１ビツトづつのオ
ーバヘッドビットを付加して３ビツトとし、これに１ビ
ット加え４ビツトにすると共に光伝送路４０への出力信
号の１と０の数を略等しくなるように符号変換する。In the code conversion unit 12, overhead bits such as frame bits are input from the OH input unit 4. To explain using an example of 2B4B conversion, one overhead bit is added to each 2 bits of data to make 3 bits. 1 bit is added to make it 4 bits, and the code is converted so that the number of 1's and 0's in the output signal to the optical transmission line 40 is approximately equal.
例えば、データが０１で、フレームビットが０なら、０
１０となり、これに１を加え０１０１としたり、又デー
タがオール１の場合で、フレームビットが１．０，１．
０の場合は、１１１．１１０ １１１ １１０となるが
、これを１１１０１１００．００１０，１１００の如（
符号変換する。For example, if the data is 01 and the frame bit is 0, then 0
10, add 1 to this to make 0101, or if the data is all 1, the frame bits are 1.0, 1 .
In the case of 0, it becomes 111.110 111 110, but this can be changed like 11101100.0010,1100 (
Convert sign.
そして、並直列変換回路（以下Ｐ／Ｓと称す）１３にて
直列信号に変換し、電気・光変換器（以下Ｅ１０と称す
）［４にて光信号に変換して光伝送路４０に送出する。Then, it is converted into a serial signal by a parallel-to-serial conversion circuit (hereinafter referred to as P/S) 13, and converted into an optical signal by an electric/optical converter (hereinafter referred to as E10) [4] and sent to an optical transmission line 40. do.
光中間中継器２′では、光伝送路４０より入力した光信
号を、光・電気変換器（以下０７Ｅと称す）１５にて電
気信号に変換し、Ｓ／Ｐ １６にて並列信号に変換し、
符号逆変換部１８に送り、符号を逆変換すると共にＯＨ
出力部２２より必要なオーバヘッドビットを出力し、必
要なものはＯＨ入力部５より入力する。In the optical intermediate repeater 2', the optical signal input from the optical transmission line 40 is converted into an electrical signal by an optical-to-electrical converter (hereinafter referred to as 07E) 15, and converted into a parallel signal by an S/P 16. ,
The code is sent to the code inverse converter 18, where the code is inversely converted and the OH
Necessary overhead bits are outputted from the output section 22, and necessary ones are inputted from the OH input section 5.
符号逆変換された信号は、符号変換部１９に入力し、先
に説明した如く、オーバヘッドビットを付加し、符号変
換し、Ｐ／Ｓ ２０にて直列信号に変換し、Ｅ１０２１
にて光信号に変換し、光伝送路４１に送出する。The sign inversely converted signal is input to the code converter 19, and as described above, overhead bits are added, code is converted, and the P/S 20 converts the signal into a serial signal.
The signal is converted into an optical signal and sent to the optical transmission line 41.
受信側光端局中継器３”では、光伝送路４１より入力し
た光信号をＱ／Ｅ ２３１こで電気信号に変換し、Ｓ／
Ｐ ２４にて並列信号Ｇこ変換し、符号逆変換部２５に
入力し、符号逆変換を行い、ＯＨ出力部６よりオーバヘ
ッドピッ１−を出力する。In the receiving side optical terminal repeater 3'', the optical signal input from the optical transmission line 41 is converted into an electrical signal by the Q/E 231, and the S/
At P24, the parallel signal G is converted, inputted to the sign inverse conversion section 25, subjected to sign inverse conversion, and the overhead signal G is outputted from the OH output section 6.
又Ｐ／Ｓ ２６にて直列信号に変換し、出力インターフ
ェース部２７より受信データを送出する。Further, the P/S 26 converts the received data into a serial signal, and outputs the received data from the output interface section 27.
この場合、入力インターフェース部１０にて入力する信
号断を検出すると、断信号をオール１発生部２８に送り
オール１を発生させ、符号変換部１２に送り符号変換し
て光伝送路４０に送出し、光中間中継器２°を介して受
信側光端局中継器３”に送信する。In this case, when the input interface section 10 detects an input signal disconnection, the disconnection signal is sent to the all 1 generation section 28 to generate all 1s, sent to the code conversion section 12 for code conversion, and sent out to the optical transmission line 40. , and is transmitted to the receiving side optical terminal station repeater 3'' via the optical intermediate repeater 2°.
光中間中継器２１のＯ／Ｅ’１５にて入力信号断を検出
した場合、又は同期はずれ検出部１７にて同期はずれを
検出すると、オア回路３Ｉを介して断信号をオール１発
生部２９に送り、オール１を発生させ、符号変換部１９
に送り符号変換して光伝送路４１に送出し、受信側光端
局中継器３゛に送信する。When an input signal disconnection is detected at the O/E'15 of the optical intermediate repeater 21, or when an out-of-sync detection section 17 detects an out-of-synchronization, a disconnection signal is sent to the all-1 generation section 29 via the OR circuit 3I. send, generate all 1s, and code converter 19
The signal is then sent to the optical transmission line 41, converted into a code, and sent to the optical terminal repeater 3' on the receiving side.
受信測光端局中継器３゛では、タイマークロック発生部
３１より出力されるクロック周期の間ｌが連続している
かをＰ／Ｓ’２６の出力側のオール１検出部３０にて検
出し、送信側光端局中継器１゛への入力信号断か、光中
間中継器２′への入力信号断か又は同期はずれを検出し
たかを認識し、回線断を検出する。In the receiving photometering end station repeater 3', the all-1 detection section 30 on the output side of the P/S'26 detects whether l is continuous during the clock period output from the timer clock generation section 31, and transmits the signal. A line disconnection is detected by recognizing whether the input signal to the side optical terminal repeater 1' is disconnected, the input signal to the optical intermediate repeater 2' is disconnected, or a synchronization loss is detected.
しかしながら、受信測光端局中継器３″で、オール１を
検出した時、送信側光端局中継器１への入力信号断か、
光中間中継器２°への入力信号断か又は同期はずれ検出
かの分離が出来ない問題点及び、オール１発生部２Ｂ、
２９．オールｌ検出部３０及びタイマークロック発生部
３１が必要で、光伝送システムとして回路規模が大きく
なる問題点がある。However, when the receiving photometering terminal repeater 3″ detects all 1s, the input signal to the transmitting optical terminal repeater 1 may be disconnected.
The problem is that it is not possible to separate whether the input signal to the optical intermediate repeater 2° is disconnected or the out-of-synchronization is detected, and the all-1 generation unit 2B.
29. This requires an all-I detection section 30 and a timer clock generation section 31, which poses a problem in that the circuit scale becomes large as an optical transmission system.
本発明は、光伝送システムとして回路規模が小さくて、
且つ受信側光端局中継器で、送信側光端局中継器にて入
力信号断を検出したか、光中間中継器にて入力信号断又
は同期はずれを検出したかの分離が出来る回線障害検出
方法の提供を目的としている。The present invention has a small circuit scale as an optical transmission system,
In addition, line failure detection can be performed at the receiving optical terminal repeater to determine whether the transmitting optical terminal repeater detected an input signal disconnection or the optical intermediate repeater detected an input signal disconnection or synchronization loss. The purpose is to provide a method.
８ 第１図は本発明の原理ブロック図である。 8 FIG. 1 is a block diagram of the principle of the present invention.
第１図に示す如く、データにオーバヘッドビットを付加
して送信する送信側光端局中継器（１）と、
該送信側光端局中継器１と光伝送路で接続された、オー
バヘッドビットを取り出し、必要なオーバヘッドビット
を付加して送信する光中間中継器２と、
該光中間中継器２と光伝送路で接続された、オーバヘッ
ドピッ］・を取り出す受信側光端局中継器３にて構成さ
れる光伝送システムにおいて、該送信側光端局中継器１
では入力信号断を検出すると、ＯＨ入力部４にて、第１
の空きオーバヘッドビット９Ｍ域に所定の符号を挿入し
て送信し、該光中間中継器２では、入力信号断又は同期
はずれを検出すると、ＯＨ入力部５にて、第２の空きオ
ーバヘッドピツＨｉ域に所定の符号を挿入して送信する
。As shown in FIG. 1, there is a transmitting optical terminal repeater (1) that adds overhead bits to data and transmits the data, and a transmitting optical terminal repeater 1 that adds overhead bits to the data and transmits the overhead bits. At the optical intermediate repeater 2, which takes out, adds necessary overhead bits, and transmits it, and at the receiving side optical terminal station repeater 3, which takes out the overhead bits connected to the optical intermediate repeater 2 through an optical transmission line. In the optical transmission system configured, the transmission side optical terminal repeater 1
When the input signal disconnection is detected, the OH input section 4 outputs the first
When the optical intermediate repeater 2 detects input signal disconnection or synchronization loss, the OH input unit 5 inserts a predetermined code into the 9M area of empty overhead bits and transmits it. A predetermined code is inserted into the file and transmitted.
該受信側光端局中継器３ではＯＨ出力部６より出力した
該第１の空きオーバヘッドビット領域及び該第２の空き
オーバヘッドビット６Ｎ域に所定の符号が挿入されてい
るかどうかで、該送信側光端局中継器１にて入力信号断
を検出したか、該光中間中継器２にて入力信号断又は同
期はずれを検出したかを検出するようにする。The receiving side optical terminal repeater 3 determines whether or not a predetermined code is inserted into the first empty overhead bit area and the second empty overhead bit area 6N output from the OH output unit 6. It is configured to detect whether the optical terminal repeater 1 detects an input signal disconnection or the optical intermediate repeater 2 detects an input signal disconnection or synchronization loss.
本発明によれば、送信側光端局中継器１では入力信号断
を検出すると、ＯＨ入力部４にて、第１の空きオーバヘ
ッドビット領域に所定の符−Ｊを挿入して送信し、
該光中間中継器２では、入力信号断又は同期はずれを検
出すると、ＯＨ入力部５にて、第２の空きオーバヘット
ピッｔ４ｉＮ域に所定の符号を挿入して送信し、
該受信側光端局中継器３ではＯＨ出力部６より出力した
該第１の空きオーバヘッドビット領域及び該第２の空き
オーハヘットビソト領域に所定の符号が挿入されている
かどうかで、該送信側光端局中継器１にて入力信号断を
検出したか、該光中間０
中継器２にて入力信号断又は同期はずれを検出したかを
検出する。According to the present invention, when the transmitting side optical terminal repeater 1 detects an input signal disconnection, the OH input section 4 inserts a predetermined code -J into the first empty overhead bit area and transmits the signal. When the optical intermediate repeater 2 detects input signal disconnection or loss of synchronization, the OH input section 5 inserts a predetermined code into the second empty overhead pit t4iN area and transmits it to the receiving optical terminal station. The transmission side optical terminal repeater 1 determines whether a predetermined code is inserted into the first empty overhead bit area and the second empty overhead bit area output from the OH output unit 6 in the transmitter 3. It is detected whether an input signal disconnection is detected at the optical intermediate 0 repeater 2, or whether an input signal disconnection or synchronization loss is detected at the optical intermediate 0 repeater 2.
従って、受信側光端局中継器３では送信側光端局中継器
１にて入力信号断を検出したか、該光中間中継器２にて
入力信号断又は同期はずれを検出したかを分離出来、又
オール１発生部２８，２９゜オール１検出部３０及びタ
イマークロック発生部３１が不要になるので、回路規模
を小さくすることが出来る。Therefore, the receiving side optical terminal station repeater 3 cannot distinguish whether the transmitting side optical terminal station repeater 1 detected an input signal disconnection or the optical intermediate repeater 2 detected an input signal disconnection or synchronization loss. Furthermore, since the all-1 generating sections 28, 29, the all-1 detecting section 30, and the timer clock generating section 31 are no longer necessary, the circuit scale can be reduced.
第２図は本発明の実施例の光伝送システムのブロック図
である。FIG. 2 is a block diagram of an optical transmission system according to an embodiment of the present invention.
第２図で第３図の従来例と異なる点は、オール１発生部
２８，２９．オール１検出部３０及びタイマークロック
発生部３１を除いた点と、送信側光端局中継器ｌでは、
入力インターフェース部１０にて入力信号断を検出する
と、ＯＨ入力部４に知らせ、所定の空きオーバヘッドビ
ット領域に例えば１を付加し、光中間中継器２を介して
、■
■
受信側光端局中継器３に知らせる点、及び、光中間中継
器２では、Ｏ／Ｅ２５にて入力信号断を検出した場合又
は同期はずれ検出部１７にて同期はずれを検出した場合
はオア回路３１を介して、ＯＨ入力部５に知らせ、所定
の空きオーバヘッドビット領域に例えば１を付加し、受
信側光端局中継器３に知らせる点及び、
受信側光端局中継器３では、Ｏｊ（出力部６にてオーバ
ヘッドピッ１−を出力し、所定のオーバヘッドビット領
域に１が挿入されているかどうかで、送信側光端局中継
器１にて入力信号断を検出したか、該光中間中継器２に
て入力信号断又は同期はずれを検出したかを分離認識出
来るようにした点である。The difference between the conventional example shown in FIG. 2 and the conventional example shown in FIG. With the exception of the all-1 detection section 30 and the timer clock generation section 31, and the transmission side optical terminal repeater l,
When the input interface unit 10 detects an input signal disconnection, it notifies the OH input unit 4, adds, for example, 1 to a predetermined empty overhead bit area, and sends the input signal to the receiving side optical terminal station via the optical intermediate repeater 2. In addition, in the optical intermediate repeater 2, when an input signal disconnection is detected at the O/E 25 or when an out-of-synchronization is detected at the out-of-synchronization detection section 17, an OH signal is sent via the OR circuit 31. The input unit 5 is informed, for example, 1 is added to a predetermined free overhead bit area, and the receiving optical terminal repeater 3 is informed. Depending on whether 1 is inserted in a predetermined overhead bit area, whether the transmitting side optical terminal repeater 1 has detected an input signal disconnection or the optical intermediate repeater 2 has detected an input signal The point is that it is possible to separately recognize whether a disconnection or out-of-synchronization has been detected.
このようにすれば、光伝送システムとして回路規模が小
さくて、且つ受信側光端局中継器３で、送信側光端局中
継器１への入力信号断か、光中間中継器２への入力信号
１υｉか又は同期はずれを検出したかの分離が出来るよ
うになる。In this way, the circuit scale is small as an optical transmission system, and the receiving side optical terminal repeater 3 is able to cut off the input signal to the transmitting side optical terminal repeater 1 or the input signal to the optical intermediate repeater 2. It becomes possible to separate whether the signal 1υi or out-of-synchronization is detected.
尚光中間中継器が複数ある場合は、入力信号断を挿入す
るオーバヘッドビット領域を別々にしておけば、どの光
中間中継器への入力信号断があったかを分離して検出出
来る。If there are a plurality of optical intermediate repeaters, if the overhead bit areas into which input signal interruptions are inserted are made separate, it is possible to separately detect which optical intermediate repeater has an input signal interruption.
以上詳細に説明せる如く本発明によれば、光伝送システ
ムとして回路規模を小さく出来、又受信側光端局中継器
で、送信側光端局中継器にて入力信号断を検出したか、
光中間中継器にて入力信号断又は同期はずれを検出した
かの分離が出来る効果がある。As described in detail above, according to the present invention, the circuit size of the optical transmission system can be reduced, and whether the receiving side optical terminal repeater detects an input signal disconnection at the transmitting side optical terminal repeater or not.
This has the effect of being able to separate whether an input signal disconnection or synchronization is detected at the optical intermediate repeater.
第１図は本発明の原理ブロック図、
第２図は本発明の実施例の光伝送システムのブロック図
、
第３図は従来例の光伝送システムのブロック図である。
図において、
１、ｌ’ は送信側光端局中継器、
３
２．２′は光中間中継器、
３．３ は受信側光端局中継器、
４３５はオーバヘッドビット入力部、
６はオーバヘッドビット出力部、
ＩＯは入力インターフェース部、
１１．１６．２４は直並列変換回路、
１３．２０．２６は並直列変換回路、
１２．１９は符号変換部、
１４．２１は電気・光変換器、
１５．２３は光・電気変換器、
１７は同期はずれ検出部、
１８．２５は符号逆変換部、
２７は出力インターフェース部、
２８．２９はオール１発生部、
３０はオール１検出部、
３Ｉはタイマークロック発生部を示す。FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an optical transmission system according to an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional optical transmission system. In the figure, 1 and l' are transmitting side optical terminal repeaters, 32.2' are optical intermediate repeaters, 3.3 are receiving side optical terminal repeaters, 435 is an overhead bit input section, and 6 is an overhead bit. Output section, IO is input interface section, 11.16.24 is serial-to-parallel conversion circuit, 13.20.26 is parallel-to-serial conversion circuit, 12.19 is code conversion section, 14.21 is electric/optical converter, 15 .23 is an optical/electrical converter, 17 is an out-of-synchronization detection section, 18.25 is a code inversion section, 27 is an output interface section, 28.29 is an all-1 generation section, 30 is an all-1 detection section, 3I is a timer The clock generation section is shown.
Claims (1)
光端局中継器（１）と、 該送信側光端局中継器（１）と光伝送路で接続された、
オーバヘッドビットを取り出し、必要なオーバヘッドビ
ットを付加して送信する光中間中継器（２）と、 該光中間中継器（２）と光伝送路で接続された、オーバ
ヘッドビットを取り出す受信側光端局中継器（３）にて
構成される光伝送システムにおいて、該送信側光端局中
継器（１）では入力信号断を検出すると、オーバヘッド
ビット入力部（４）にて、第１の空きオーバヘッドビッ
ト領域に所定の符号を挿入して送信し、 該光中間中継器（２）では、入力信号断又は同期はずれ
を検出すると、オーバヘッドビット入力部（５）にて、
第２の空きオーバヘッドビット領域に所定の符号を挿入
して送信し、 該受信側光端局中継器（３）ではオーバヘッドビット出
力部（６）より出力した該第１の空きオーバヘッドビッ
ト領域及び該第２の空きオーバヘッドビット領域に所定
の符号が挿入されているかどうかで、該送信側光端局中
継器（１）にて入力信号断を検出したか、該光中間中継
器（２）にて入力信号断又は同期はずれを検出したかを
検出するようにしたことを特徴とする回線障害検出方法
。[Scope of Claims] A transmitting-side optical terminal repeater (1) that adds overhead bits to data and transmits the data; and a transmitting-side optical terminal repeater (1) connected to the transmitting-side optical terminal repeater (1) by an optical transmission line.
An optical intermediate repeater (2) that extracts overhead bits, adds necessary overhead bits, and transmits the data; and a receiving optical terminal station that extracts the overhead bits and is connected to the optical intermediate repeater (2) via an optical transmission line. In an optical transmission system configured with a repeater (3), when the transmitting side optical terminal repeater (1) detects an input signal disconnection, the overhead bit input section (4) inputs the first vacant overhead bit. A predetermined code is inserted into the area and transmitted, and when the optical intermediate repeater (2) detects input signal disconnection or synchronization, the overhead bit input section (5) outputs the following information:
A predetermined code is inserted into the second free overhead bit area and transmitted, and the receiving side optical terminal repeater (3) inserts the first free overhead bit area and the corresponding code output from the overhead bit output unit (6). Depending on whether a predetermined code is inserted in the second free overhead bit area, it is determined whether the transmitting side optical terminal repeater (1) has detected an input signal disconnection or the optical intermediate repeater (2) has detected an input signal disconnection. 1. A line fault detection method, characterized in that it detects whether input signal disconnection or synchronization is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1249676A JP2720543B2 (en) | 1989-09-26 | 1989-09-26 | Optical transmission system and fault information detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1249676A JP2720543B2 (en) | 1989-09-26 | 1989-09-26 | Optical transmission system and fault information detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03112240A true JPH03112240A (en) | 1991-05-13 |
| JP2720543B2 JP2720543B2 (en) | 1998-03-04 |
Family
ID=17196550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1249676A Expired - Lifetime JP2720543B2 (en) | 1989-09-26 | 1989-09-26 | Optical transmission system and fault information detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2720543B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05336046A (en) * | 1992-05-29 | 1993-12-17 | Fujitsu Ltd | Optical amplification repeating system |
| WO2001080469A1 (en) * | 2000-04-18 | 2001-10-25 | Nippon Telegraph And Telephone Corporation | Communication method and communication system |
| US7471697B2 (en) | 2002-03-13 | 2008-12-30 | Nec Corporation | Multiplex transmission system for reporting alert information to the conversion device on the receiving side without using a dedicated frame |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5146014A (en) * | 1974-10-18 | 1976-04-20 | Nippon Electric Co | |
| JPS61135242A (en) * | 1984-12-05 | 1986-06-23 | Nec Corp | Supervisory unit for fault of relaying system |
-
1989
- 1989-09-26 JP JP1249676A patent/JP2720543B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5146014A (en) * | 1974-10-18 | 1976-04-20 | Nippon Electric Co | |
| JPS61135242A (en) * | 1984-12-05 | 1986-06-23 | Nec Corp | Supervisory unit for fault of relaying system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05336046A (en) * | 1992-05-29 | 1993-12-17 | Fujitsu Ltd | Optical amplification repeating system |
| WO2001080469A1 (en) * | 2000-04-18 | 2001-10-25 | Nippon Telegraph And Telephone Corporation | Communication method and communication system |
| US7496100B2 (en) | 2000-04-18 | 2009-02-24 | Nippon Telegraph & Telephone Corporation | Method and apparatus for synchronous frame communication |
| US7471697B2 (en) | 2002-03-13 | 2008-12-30 | Nec Corporation | Multiplex transmission system for reporting alert information to the conversion device on the receiving side without using a dedicated frame |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2720543B2 (en) | 1998-03-04 |
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