JP2711670B2 - Repeater monitoring method - Google Patents
Repeater monitoring methodInfo
- Publication number
- JP2711670B2 JP2711670B2 JP5787888A JP5787888A JP2711670B2 JP 2711670 B2 JP2711670 B2 JP 2711670B2 JP 5787888 A JP5787888 A JP 5787888A JP 5787888 A JP5787888 A JP 5787888A JP 2711670 B2 JP2711670 B2 JP 2711670B2
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- Japan
- Prior art keywords
- parity
- repeater
- signal
- circuit
- odd
- 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
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- Monitoring And Testing Of Transmission In General (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Description
【発明の詳細な説明】 〔概 要〕 多数の中継器を含む回線における中継器監視方式に関
し、 端局において位相復調回路を必要とせず、かつ主信号
の伝送に悪影響を及ぼすことなく中継器の動作監視を行
い得るようにすることを目的とし、 両端局装置間に多数の中継器を具え、パリテイビツト
を挿入した主信号を順次再生して中継するデイジタル通
信方式において、各中継器に対する監視指示に対応して
主信号のパリテイビツトに偶奇変調を施して中継器に送
出するパリテイ偶奇変調手段を一方の端局装置に、該パ
リテイ偶奇数変調周期によつて指示されたとき、監視情
報に応じて主信号における該パリテイ偶奇変調周期を強
制置換によつてさらに変調して他方の端局装置に対して
送出するパリテイビツト強制置換手段を各中継器に、主
信号のパリテイ偶奇変調周期における前記強制置換周期
を検出して被指示中継器における該監視情報を判別する
監視手段を他方の端局装置にそれぞれ具えて構成する。DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a repeater monitoring method for a line including a large number of repeaters, and does not require a phase demodulation circuit at a terminal station and does not adversely affect transmission of a main signal. In a digital communication system in which a multiplicity of repeaters are provided between terminal devices at both ends, and a main signal inserted with parity bits is sequentially reproduced and relayed, a monitoring instruction for each repeater is provided. Correspondingly, when the parity even-odd modulation means for performing even-odd modulation on the parity bit of the main signal and sending it out to the repeater is instructed to one of the terminal devices according to the parity even-odd modulation period, the parity-modulating means is operated in accordance with the monitoring information. The parity bit forced replacement means for further modulating the parity even-odd modulation period in the signal by forced replacement and sending the modulated signal to the other terminal device is provided to each repeater. Monitoring means for determining the monitoring information by detecting the forced substitution period at parity odd modulation period in the indicated relay constituting comprise respectively the other end station.
本発明は多数の中継器を含む回線における中継器監視
方式に関するものである。The present invention relates to a repeater monitoring method for a line including a plurality of repeaters.
光中継システム特に長距離海底中継システム等におい
ては、回線中に含まれる中継器を正常な動作状態に保つ
ために、各中継器の動作状態を常時監視できることが必
要である。In an optical repeater system, especially a long-haul submarine repeater system, it is necessary to constantly monitor the operation state of each repeater in order to keep the repeaters included in the line in a normal operation state.
このような中継器の動作監視を行う中継器監視方式
は、主信号と同系統の信号を用いて主信号伝送に悪影響
を及ぼすことなく実行すことができ、かつ他の変復調回
路を必要としないものであることが要望される。The repeater monitoring method for monitoring the operation of such a repeater can be executed without adversely affecting the main signal transmission by using a signal of the same system as the main signal, and does not require another modulation / demodulation circuit. It is desired to be something.
第５図は従来の、および本発明の適用される光デイジ
タル中継回線の構成を例示したものであつて、端局21,2
2とその間に設けられた上り回線23、下り回線24とから
なつている、上り回線23は端局装置25、中継器261〜2
6n、端局装置27を有し、下り回線24は端局装置28、中継
器291〜29n、端局装置30を有している。FIG. 5 shows an example of the configuration of a conventional optical digital trunk line to which the present invention is applied.
2 and an up line 23 and a down line 24 provided therebetween. The up line 23 is a terminal device 25 and repeaters 26 1 to 26.
6 n, has an end station 27, the downlink 24 has end office device 28, the repeater 29 1 ~ 29 n, the end station 30.
従来このような中継回線において、各光デイジタル中
継器の動作監視をインサービス状態で行う方法として
は、各回線の主信号にパリテイビツトを設けて一方の端
局において偶奇のパリテイ変調を行い、この際のパリテ
イ変調周波数にベースバンドコマンドを重畳することに
よつて、中継器を制御して応答信号を送出させ、他方の
端局においてこれを受信して応答信号の内容から当該中
継器の動作状態を監視する方式が用いられている。Conventionally, in such a trunk line, as a method of monitoring the operation of each optical digital repeater in an in-service state, a parity bit is provided in the main signal of each line, and even-odd parity modulation is performed at one terminal station. By superimposing the baseband command on the parity modulation frequency of the above, the repeater is controlled to transmit a response signal, and the other terminal receives the response signal and determines the operation state of the repeater from the content of the response signal. A monitoring method is used.
この場合、中継器から他方の端局に対する応答信号の
転送をパリテイビツトを用いて行うことは、通常は中継
器内におけるパリテイビツト抽出のための回路規模が大
きくなるため用いられず、その代りに中継器において主
信号に位相変調をかけることによつて応答信号を端局に
転送する方法が一般に用いられている。In this case, the transfer of the response signal from the repeater to the other terminal using the parity bit is not usually used because the circuit scale for extracting the parity bit in the repeater is not used. In general, a method of transferring a response signal to a terminal by applying phase modulation to a main signal has been used.
上述した従来の方法では、端局からのコマンド送出と
中継器からの応答信号の送出とで用いられる変調方式が
異なつているため、端局において位相復調の回路が必要
となつて回路規模が増大するという問題がある。In the conventional method described above, the modulation scheme used for transmitting a command from a terminal station and the transmission of a response signal from a repeater are different, so that a circuit for phase demodulation is required at the terminal station, which increases the circuit scale. There is a problem of doing.
また、位相復調によつて各中継器から応答信号を送出
する方式では、多中継伝送の場合、ジツタの累積によつ
て伝送特性を悪化させるという問題がある。Also, the method of transmitting a response signal from each repeater by phase demodulation has a problem that, in the case of multi-relay transmission, transmission characteristics are deteriorated due to accumulation of jitter.
本発明はこのような従来技術の課題を解決しようとす
るもであつて、端局において位相復調回路を必要とせ
ず、また主信号の伝送に悪影響を及ぼすことなく中継器
の動作監視を行うことができる。中継器監視方式を提供
することを目的としている。SUMMARY OF THE INVENTION The present invention is to solve such problems of the prior art, and does not require a phase demodulation circuit at a terminal station and monitors operation of a repeater without adversely affecting transmission of a main signal. Can be. It aims to provide a repeater monitoring system.
本発明の中継器監視方式は、第１図にその実施例を示
すように両端局装置間に多数の中継器を具え、パリテイ
ビツトを挿入した主信号を順次再生して中継するデイジ
タル通信方式において、パリテイ偶奇変調手段２を一方
の端局装置に、パリテイビツト強制置換手段８を各中継
器に、監視手段12を他方の端局装置にそれぞれ具えたも
のである。The repeater monitoring system according to the present invention is a digital communication system which comprises a plurality of repeaters between terminal devices as shown in FIG. 1 and sequentially reproduces and relays a main signal with a parity bit inserted therein. The parity even / odd modulation means 2 is provided in one terminal equipment, the parity bit forced replacement means 8 is provided in each repeater, and the monitoring means 12 is provided in the other terminal equipment.
パリテイ偶奇変調手段２は、各中継器に対する監視指
示に対応して主信号のパリテイビツトに偶奇変調を施し
さらにパリテイ変調周波数に個々の中継器のアドレスを
含むベースバンドコマンドを重畳して中継器に送出する
ものである。The parity even-odd modulating means 2 applies even-odd modulation to the parity bit of the main signal in response to the monitoring instruction for each repeater, and superimposes a baseband command including the address of each repeater on the parity modulation frequency and sends it to the repeater. Is what you do.
パリテイビツト強制置換手段８は、該パリテイ偶奇変
調周期によつて指示されたとき、監視情報に応じて主信
号における該パリテイ偶奇変調周期を強制置換によつて
さらに変調して他方の端局装置に対して送出するもので
ある。When the parity bit forced replacement means 8 is instructed by the parity even / odd modulation cycle, the parity even / odd modulation cycle of the main signal is further modulated by forced replacement in accordance with the monitoring information, and is further transmitted to the other terminal device. Is sent out.
監視手段12は、主信号のパリテイ偶奇変調周期におけ
る前記強制置換周期を検出して被指示中継器における該
監視情報を判別するものである。The monitoring means 12 detects the forcible replacement period in the parity even-odd modulation period of the main signal and determines the monitoring information in the indicated repeater.
両端局装置間に多数の中継器を具え、パリテイビツト
を挿入した主信号を順次再生して中継するデイジタル通
信方式において、中継器の動作監視をインライン状態で
可能にする。In a digital communication system in which a large number of repeaters are provided between the terminal stations and a main signal with a parity bit inserted is sequentially reproduced and relayed, the operation of the repeaters can be monitored in-line.
そのために一方の端局装置において、指示された監視
すべき中継器に応じて、主信号のパリテイビツトに偶奇
変調を施して中継器に対して送出する。For this purpose, one terminal equipment applies even-odd modulation to the parity of the main signal in accordance with the designated repeater to be monitored, and sends it to the repeater.
中継器では、受信した主信号におけるパリテイ偶奇変
調周期によつて指示されたことを知つたとき、所定の監
視情報に応じて主信号におけるこのパリテイ偶奇変調周
期を強制置換によつてさらに変調して他方の端局装置に
対して送出する。When the repeater knows that it has been instructed by the parity even-odd modulation cycle of the received main signal, the repeater further modulates the parity even-odd modulation cycle of the main signal by forced replacement according to predetermined monitoring information. It is sent to the other terminal device.
他方の端局装置では、受信した主信号のパリテイ偶奇
変調周期における上述の強制置換周期を検出して指示さ
れた中継器における監視情報を判別する。The other terminal device detects the above-mentioned forced replacement period in the parity even-odd modulation period of the received main signal and determines the monitoring information in the designated repeater.
従つて本発明の中継監視方式では、位相変調方式で応
答信号を送信する場合のように端局に位相復調回路を必
要とせず、かつ主信号伝送に悪影響を及ぼすことなく、
中継器の動作監視を行うことができる。Therefore, in the relay monitoring system of the present invention, unlike the case where a response signal is transmitted by the phase modulation system, the terminal station does not require a phase demodulation circuit, and does not adversely affect main signal transmission.
The operation of the repeater can be monitored.
第１図は本発明の一実施例の構成を示す図である。同
図においては一方の端局装置Ａと、他方の端局装置Ｂお
よび１個の中継器のみが示されているが、他の多数の中
継器も同様の構成を有しているものとする。FIG. 1 is a diagram showing the configuration of one embodiment of the present invention. Although only one terminal device A, the other terminal device B, and one repeater are shown in FIG. 1, it is assumed that many other repeaters have the same configuration. .
端局装置Ａにおいては、パリテイ検出回路１において
主信号入力データの１ブロツクごとにパリテイを検出す
る。パリテイ偶奇変調回路２は、パリテイ検出結果に応
じてブロツクごとにパリテイビツトを挿入するが、中継
器の監視を行う場合は挿入されるパリテイビツトを、例
えば通常は偶パリテイビツトであるが、一定フレーム数
ごとに奇パリテイビツトとするパリテイ偶奇変調を施す
ことによつて監視指示を行う。この場合の変調周波数
は、システムの符号構成に応じて選択されるが、中継器
監視を行わない場合には、パリテイ偶奇変調を行わず、
上例の場合偶パリテイビツトのみを送出する。送信回３
はこのようにして作成された信号に変換して出力する。In the terminal device A, the parity detection circuit 1 detects the parity for each block of the main signal input data. The parity even-odd modulation circuit 2 inserts a parity bit for each block in accordance with the parity detection result. When monitoring a repeater, the parity bit to be inserted is, for example, usually an even parity bit. A monitoring instruction is issued by performing parity even-odd modulation as an odd parity bit. The modulation frequency in this case is selected according to the code configuration of the system, but when the repeater monitoring is not performed, the parity even-odd modulation is not performed,
In the case of the above example, only even parity bits are transmitted. Transmission times 3
Is converted into a signal created in this way and output.
中継器においては、受信回路４を経て光信号を受信し
て電気信号に変換する。パリテイ偶奇復調回路５は、受
信信号に施されているパリテイ偶奇変調を復調して例え
ば上例の場合、奇パリテイビツトごとに極性反転する周
期信号からなる復調信号を発生する。パリテイビツト判
定回路６は、この復調信号における変化点の位置から、
受信信号における奇パリテイビツト挿入位置を検出す
る。The repeater receives the optical signal via the receiving circuit 4 and converts it into an electric signal. The parity even-odd demodulation circuit 5 demodulates the parity even-odd modulation applied to the received signal and generates, for example, in the case of the above example, a demodulated signal consisting of a periodic signal whose polarity is inverted for each odd parity bit. The parity bit determination circuit 6 calculates the position of the change point in the demodulated signal from
An odd parity bit insertion position in the received signal is detected.
一方応答信号発生回路７は、端局装置Ａからの監視指
示に対して応答信号として送出すべき中継器内の監視情
報に対応して、周期の変化する強制置換パルスを発生す
る。強制置換パルスの周期は、監視情報の内容に応じて
複数個設けられれる。パリテイビツト強制置換回路８
は、パリテイビツト判定回路６から示される奇パリテイ
ビツト挿入位置のうち、応答信号発生回路７から与えら
れる強制置換パルスに対応する位置において、奇パリテ
イビツトを強制的に偶パリテイビツトに置換する。送信
回路９は、このパリテイビツトの置換の行われた信号を
光信号に変換して送出する。On the other hand, the response signal generation circuit 7 generates a forcible replacement pulse whose period changes in response to the monitoring information in the repeater to be transmitted as a response signal in response to the monitoring instruction from the terminal device A. A plurality of periods of the forced replacement pulse are provided according to the contents of the monitoring information. Parity bit forced replacement circuit 8
Of the odd parity insertion position indicated by the parity determination circuit 6, the odd parity is forcibly replaced with the even parity at a position corresponding to the forced replacement pulse supplied from the response signal generation circuit 7. The transmitting circuit 9 converts the parity-substituted signal into an optical signal and sends it out.
端局装置Ｂにおいて、受信回路10は中継器を経由して
送られた光信号を受信し電気信号に変換して出力信号を
生じる。パリテイ偶奇変調回路11は受信信号におけるパ
リテイ偶奇復調を変調して、奇パリテイビツトごとに極
性反転する周期信号からなる復調信号を発生する。この
復調信号は一定周期で極性反転する周期信号中に、これ
より長い一定周期で強制置換によつて極性反転しない部
分を含んでいる。監視回路12はこの強制置換の周期を検
出することによつて、中継器における応答信号の内容を
判別することができる。なおこの際、復調信号における
極性反転周期に含まれる２種類のベースバンド周期のう
ち、パリテイ偶奇変調変調で重畳したベースバンド信号
から監視指示を受けた中継器（と監視項目）を知り、パ
リテイ偶奇の強制置換で重畳したベースバンド応答信号
から応答信号すなわち被監視情報の内容を知るようにす
ることもできる。このような方法で中継器から応答され
る中継器内における被監視情報としては、例えば中継器
内の受信回路における受信電力のレベル、送信回路にお
けるレーザダイオードのバイアス等があるが、これ以上
にも中継器内各部の動作状態を示す電圧信号等の監視を
行うことができる。In the terminal device B, the receiving circuit 10 receives the optical signal transmitted via the repeater and converts it into an electric signal to generate an output signal. The parity even / odd modulation circuit 11 modulates the parity even / odd demodulation in the received signal to generate a demodulated signal including a periodic signal whose polarity is inverted for each odd parity bit. The demodulated signal includes a portion of a periodic signal whose polarity is inverted at a fixed period, the portion not being inverted by the forced replacement at a longer fixed period. The monitoring circuit 12 can determine the content of the response signal in the repeater by detecting the period of the forced replacement. At this time, of the two types of baseband periods included in the polarity inversion period of the demodulated signal, the repeater (and the monitoring item) that has received the monitoring instruction from the baseband signal superimposed by the parity even / odd modulation modulation is known, and the parity even / odd is determined. , The response signal, that is, the contents of the monitored information can be known from the baseband response signal superimposed by the forced replacement of The information to be monitored in the repeater responded from the repeater in such a manner includes, for example, the level of the reception power in the reception circuit in the repeater, the bias of the laser diode in the transmission circuit, and the like. It is possible to monitor a voltage signal or the like indicating an operation state of each section in the repeater.
第２図は本発明方式における中継器の具体的構成例を
示したものであつて、第１図におけると同じ部分を同じ
番号で示し、パリテイ偶奇変調回路５において、51はNR
Z−RZ変換回路、52は分周回路、53は低域通過フイル
タ、54は波形成形回路、55は遅延回路である。Figure 2 an alien shows a specific configuration of the repeater according to the present invention method shows the same portion as in FIG. 1 with the same number, the parity odd modulation circuit 5, the 5 1 NR
Z-RZ conversion circuit, 5 2 frequency divider, 5 3 low-pass filter, 5 4 waveform shaping circuit, 5 5 is the delay circuit.
第３図は第２図の回路における各部信号を示し、は
受信回路４の出力信号、は分周器52の出力信号、は
低域通過フイルタ553の出力信号である。Figure 3 shows the various parts signals in the circuit of Figure 2, the output signal of the receiving circuit 4, the output signal of the frequency divider 5 2, is the output signal of the low-pass filter 55 3.
また第４図はパリテイビツト強制置換回路８の動作を
説明するものであつて、（１）は受信入力信号、（２）
は強制置換パルス、（３）はパリテイビツト強制置換回
路８の出力信号である。FIG. 4 is a diagram for explaining the operation of the parity bit forced replacement circuit 8, wherein (1) is a received input signal, and (2)
Is a forced replacement pulse, and (3) is an output signal of the parity bit forced replacement circuit 8.
受信回路４は中継線からの入力光デイジタル信号を受
信して、電気信号に変換して出力信号を生じる。この信
号は第３図な示すように一定周期のブロツク構成さ
れ、各ブロツクごとに一定位置にパリテイビツトを挿入
されている。この場合のパリテイビツトは、前述のよう
に端局においてパリテイ偶奇変調変調されることによつ
て、例えば第３図のように偶パリテイビツト中に一定
周期に奇パリテイビツトが挿入された形成になつてい
る。The receiving circuit 4 receives the input optical digital signal from the trunk line and converts it into an electric signal to generate an output signal. As shown in FIG. 3, this signal is constituted by blocks having a fixed period, and a parity bit is inserted at a fixed position for each block. In this case, the parity bit is modulated by the parity even-odd modulation at the terminal as described above, so that, for example, as shown in FIG. 3, the odd parity is inserted into the even parity at a predetermined period.
伝送信号としてNRZ信号が使用される場合は、NRZ−RZ
変換回路51は、この信号をRZ信号に変換する。分周回路
52は、出力RZ信号を２分周する。分周回路52の出力信号
は第３図に示すように、各ブロツクがマーク率1/2の
信号における最後のパリテビツト挿入位置において、
“1"または“0"が現れ、奇数パリテイビツトごとに“1"
または“0"に交互に変化する。従つてこの信号を低域通
過フイルタ53を通過させることによつて、マーク率の変
化によつて、第３図に示すような周期的に変化する信
号からなる復調信号が生じる。復調信号は波形回路54に
おいて波形整形を行われ、遅延回路55において低域通過
フイルタ53に基づく遅延時間を補正する遅延を与えられ
て、パリテイビツト判定回路６に加えられて、奇数パリ
テイビツト挿入位置を判定される。If an NRZ signal is used as the transmission signal, NRZ-RZ
Converter 5 1 converts the signal into an RZ signal. Divider circuit
5 2 divided by 2 the output RZ signal. The output signal of the frequency dividing circuit 5 2 As shown in FIG. 3, in the last Paritebitsuto insertion position in each block mark rate 1/2 of the signal,
“1” or “0” appears, and “1” for each odd parity bit
Or alternately changes to “0”. Accordance connexion Yotsute the signal passing through a low-pass filter 5 3, Yotsute to changes in the mark ratio, the demodulated signal consisting of periodically varying signals as shown in Figure 3 occurs. Demodulated signal is done to waveform shaping in the waveform circuit 5 4, the delay circuit 5 5 given the delay for correcting the delay time based on the low-pass filter 5 3, added to the Pariteibitsuto judging circuit 6, the odd Pariteibitsuto inserted The position is determined.
応答信号発生回路７は、端局からの制御に応じて送出
すべき中継器内の監視情報に対応して周期の変化する、
第４図（２）に示すような強制置換パルスを発生する。
パリテイビツト強制置換回路８は、パリテイビツト判定
回路６から示される第４図（１）に示す奇パリテイビツ
ト挿入位置のうち、強制置換パルスに対応する位置にお
いて、第４図（３）に示すように奇パリテイビツトを強
制的に偶パリテイビツトに置換する。送信回路９は、こ
のパリテイビツトの置換の行われた信号を光信号に変換
して次位の中継器または端局Ｂに対して送出する。The response signal generation circuit 7 changes the cycle in accordance with the monitoring information in the repeater to be transmitted according to the control from the terminal station.
A forced replacement pulse as shown in FIG. 4 (2) is generated.
The parity-bit forced replacement circuit 8 outputs the odd parity bit as shown in FIG. 4 (3) at the position corresponding to the forced replacement pulse among the odd parity bit insertion positions shown in FIG. 4 (1) indicated by the parity bit determination circuit 6. Is forcibly replaced with even parity bits. The transmitting circuit 9 converts the parity-substituted signal into an optical signal and sends it to the next repeater or terminal B.
以上説明したように本発明の中継器監視方式によれ
ば、光デイジタル中継器等において、端局から中継器に
対する監視制御と、中継器から端局に対する応答とを主
信号のパリテイビツトを用いて行うようにしたので、主
信号の伝送に悪影響を及ぼすことがなく、また他の変復
調回路を必要とすることなく、中継器の動作監視を行う
ことができる。As described above, according to the repeater monitoring method of the present invention, in an optical digital repeater or the like, monitoring control of the repeater from the terminal station and response from the repeater to the terminal station are performed using the parity of the main signal. As a result, the operation of the repeater can be monitored without adversely affecting the transmission of the main signal and without requiring another modulation / demodulation circuit.
第１図は本発明の、実施例の構成を示す図、 第２図は本発明方式における中継器の具体的構成例を示
す図、 第３図は第２図の回路における各部信号を示す図、 第４図はパリテイビツト強制置換回路の動作を説明する
図、 第５図は従来のおよび本発明が適用される光デイジタル
中継回線の構成例を示す図である。 １……パリテイ検出回路 ２……パリテイ偶奇変調回路 3,9……送信回路 4,10……受信回路 5,11……パリテイ偶奇復調回路 ６……パリテイビツト判定回路 ７……応答信号発生回路 ８……パリテイビツト強制置換回路 12……監視回路FIG. 1 is a diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a diagram showing a specific configuration example of a repeater in the system of the present invention, and FIG. 3 is a diagram showing signals of respective parts in the circuit of FIG. FIG. 4 is a diagram for explaining the operation of the parity bit forced replacement circuit, and FIG. 5 is a diagram showing a configuration example of a conventional optical digital trunk line to which the present invention is applied. DESCRIPTION OF SYMBOLS 1 ... Parity detection circuit 2 ... Parity even-odd modulation circuit 3,9 ... Transmission circuit 4,10 ... Reception circuit 5,11 ... Parity even-odd demodulation circuit 6 ... Parity bit determination circuit 7 ... Response signal generation circuit 8 …… Parity bit forced replacement circuit 12 …… Monitoring circuit
Claims (1)
テイビツトを挿入した主信号を順次再生して中継するデ
イジタル通信方式において、 各中継器に対する監視指示に対応して主信号のパリテイ
ビツトに偶奇変調を施して中継器に送出するパリテイ偶
奇変調手段（２）を一方の端局装置に、 該パリテイ偶奇変調周期によつて指示されたとき、監視
情報に応じて主信号における該パリテイ偶奇変調周期を
強制置換によつてさらに変調して他方の端局装置に対し
て送出するパリテイビツト強制置換手段（８）を各中継
器に、 主信号のパリテイ偶奇変調周期における前記強制置換周
期を検出して被指示中継器における該監視情報を判別す
る監視手段（12）を他方の端局装置に それぞれ具えたことを特徴とする中継器監視方式。1. A digital communication system comprising a plurality of repeaters between terminal devices and sequentially reproducing and relaying a main signal in which a parity bit is inserted. In a digital communication system, the main signal parity is changed in response to a monitoring instruction for each repeater. When the parity even-odd modulation means (2) for performing even-odd modulation and sending it to the repeater is instructed to one terminal device by the parity even-odd modulation cycle, the parity even-odd modulation in the main signal is performed according to the monitoring information. Parity-bit forced replacement means (8) for further modulating the cycle by forced replacement and sending it to the other terminal device is provided to each repeater for detecting the forced replacement cycle in the parity even-odd modulation cycle of the main signal. A repeater monitoring system, characterized in that monitoring means (12) for determining the monitoring information in the designated repeater is provided in each of the other terminal devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5787888A JP2711670B2 (en) | 1988-03-11 | 1988-03-11 | Repeater monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5787888A JP2711670B2 (en) | 1988-03-11 | 1988-03-11 | Repeater monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01231549A JPH01231549A (en) | 1989-09-14 |
| JP2711670B2 true JP2711670B2 (en) | 1998-02-10 |
Family
ID=13068240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5787888A Expired - Lifetime JP2711670B2 (en) | 1988-03-11 | 1988-03-11 | Repeater monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2711670B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0738648B2 (en) * | 1989-10-06 | 1995-04-26 | 富士通株式会社 | Optical signal relay transmission control system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0258217A (en) * | 1988-08-24 | 1990-02-27 | Nippon Telegr & Teleph Corp <Ntt> | Metallic film forming method |
| JPH02308526A (en) * | 1989-05-24 | 1990-12-21 | Hitachi Ltd | Manufacture of semiconductor device |
| JPH03205830A (en) * | 1990-01-06 | 1991-09-09 | Fujitsu Ltd | Manufacture of semiconductor device and polycrystalline germanium |
| JPH04221821A (en) * | 1990-12-25 | 1992-08-12 | Fujitsu Ltd | Manufacture of semiconductor device |
-
1988
- 1988-03-11 JP JP5787888A patent/JP2711670B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0258217A (en) * | 1988-08-24 | 1990-02-27 | Nippon Telegr & Teleph Corp <Ntt> | Metallic film forming method |
| JPH02308526A (en) * | 1989-05-24 | 1990-12-21 | Hitachi Ltd | Manufacture of semiconductor device |
| JPH03205830A (en) * | 1990-01-06 | 1991-09-09 | Fujitsu Ltd | Manufacture of semiconductor device and polycrystalline germanium |
| JPH04221821A (en) * | 1990-12-25 | 1992-08-12 | Fujitsu Ltd | Manufacture of semiconductor device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01231549A (en) | 1989-09-14 |
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