JPS60127833A - Optical pcm repeater supervisory circuit - Google Patents
Optical pcm repeater supervisory circuitInfo
- Publication number
- JPS60127833A JPS60127833A JP58236806A JP23680683A JPS60127833A JP S60127833 A JPS60127833 A JP S60127833A JP 58236806 A JP58236806 A JP 58236806A JP 23680683 A JP23680683 A JP 23680683A JP S60127833 A JPS60127833 A JP S60127833A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- repeater
- terminal station
- pcm repeater
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/40—Monitoring; Testing of relay systems
- H04B17/401—Monitoring; Testing of relay systems with selective localization
- H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
- H04B17/403—Monitoring; Testing of relay systems with selective localization using different frequencies generated by local oscillators
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ）発明の技術分野
本発明は、光ＰＣＭ中継器の異常を端局において遠方監
視するために用いる光ＰＣＭ中継器監視回路に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an optical PCM repeater monitoring circuit used for remotely monitoring abnormalities in an optical PCM repeater at a terminal station.
（ｂ）技術の背景
通信線路長が長い場合には同軸ケーブルと同様に光ケー
ブルにおいても、必要な伝送特性を確保するため、たと
えば２０ｋｍ毎に中継器が用いられており、近時、光ケ
ーブルの性能の向上に伴って。(b) Background of the technology When the communication line length is long, repeaters are used for optical cables as well as coaxial cables to ensure the necessary transmission characteristics, for example every 20 km. With the improvement of.
その設置間隔は長くなる傾向にある。しかし、これにも
増して線路長が長くなるため端局間に多数の中継器が設
置されるようになり、現在では中継器の監視が重要な技
術課題になってきている。The interval between installations is becoming longer. However, as line lengths have become even longer, a large number of repeaters have been installed between terminal stations, and monitoring of repeaters has now become an important technical issue.
（Ｃ）従来技術と問題点 光ＰＣＭ中継器における異常を監視するため。(C) Conventional technology and problems To monitor abnormalities in optical PCM repeaters.
その主要構成機器である光−電気変換器および電気−光
変換器には、それぞれの出力が所定値以下に低下したと
き、あるいは所定範囲を越えたとき警報信号を発生ずる
手段が設けられている。この警報信号を端局において検
知するため、従来、打合せ回線用として光ケーブルに併
設されているメタルワイヤを利用して直接に検知する方
式、前記警報信号によって断続あるいは切断されるよう
に構成される監視用発振器を備え、その出力を前記メタ
ルワイヤによって監視する方式等が用いられていた。The optical-to-electrical converter and the electrical-to-optical converter, which are the main components thereof, are equipped with a means for generating an alarm signal when their output drops below a predetermined value or exceeds a predetermined range. . In order to detect this alarm signal at the terminal station, conventional methods include direct detection using a metal wire attached to the optical cable for the meeting line, and monitoring configured to be interrupted or disconnected depending on the alarm signal. A method was used in which the output of the oscillator was monitored using the metal wire.
しかし、前者の方式は雷等の外乱によって発生ずる誘導
信号を誤って検知するという欠点、また後者の方式は中
継器毎に＾価な発振器を設けなければならないという欠
点が問題になっている。However, the former method has the disadvantage of erroneously detecting induced signals generated by disturbances such as lightning, and the latter method has the disadvantage of requiring an expensive oscillator for each repeater.
（ｄ）発明の目的
本発明の目的は、信頼度が商く且っ安価な装置によって
光ＰＣＭ中継器の異常を確実に監視できるようにするこ
とにある。(d) Purpose of the Invention The purpose of the present invention is to enable reliable monitoring of abnormalities in optical PCM repeaters using a highly reliable and inexpensive device.
（ｅ）発明の構成 すなわち１本発明の光ＰＣＭ中継器監視回路は。(e) Structure of the invention That is, the optical PCM repeater monitoring circuit of the present invention is as follows.
光ＰＣＭ中継器に設げられ光−電気変換器および電気−
光変換器の少なくとも何れかが発生する警報信号によっ
て光ＰＣＭ中継器毎に固有のパルス信号を発生ずる信号
発生器と、光ＰＣＭ中継器に設けられ前記信号発生器が
発生ずるパルス信号をＦＭ変調するＦＭ変調器と、端局
に設けられ前記ＦＭ変調器によってＦＭ変調され主信号
に重畳された前記パルス信号を検出する検出器とを備え
。The optical-to-electrical converter and electrical converter installed in the optical PCM repeater
a signal generator that generates a unique pulse signal for each optical PCM repeater in response to an alarm signal generated by at least one of the optical converters; and a signal generator that is installed in the optical PCM repeater and modulates the pulse signal generated by the signal generator. and a detector provided at a terminal station to detect the pulse signal FM modulated by the FM modulator and superimposed on the main signal.
光−電気変換器あるいは電気−光変換器が発生ずる警報
信号を光ケーブルを介し端局において検知できるように
したものである。An alarm signal generated by an optical-to-electrical converter or an electric-to-optical converter can be detected at a terminal station via an optical cable.
（ｆ）発明の実施例
以下に本発明の要旨を実施例によって具体的に説明する
。(f) Examples of the Invention The gist of the present invention will be specifically explained below using examples.
第１図は本発明一実施例の構成を説明するブロック図で
あり、１は一方の端局、２は光ＰＣＭ中継器、３は他方
の端局、１１・２３・２６および３２は電気信号を光信
号に変換する電気−光変換器（Ｅｌｏ）、１２・２１・
２８および３１は光信号を電気信号に変換する光−電気
変換器（０／Ｅ）、１３および３３はＦＭ信号からパル
ス信号を取り出すＦＭ復ａ器（ＤＥＭ）、１４および３
４はそれぞれＦＭ復調器１３および３４から取り出され
たパルス信号を検出する検出器（ＤＥＴ）、２２および
２７は電気信号を増幅する増幅器、２４は光ＰＣＭ中継
器２に固有のパルス信号を発生ずる信号発生器（ＳＧ）
、また２５は信号発生器２４が発生ずるパルス信号をＦ
Ｍ変調するＦＭ変調器（ＭＯＤ）である。FIG. 1 is a block diagram illustrating the configuration of an embodiment of the present invention, in which 1 is one terminal station, 2 is an optical PCM repeater, 3 is the other terminal station, and 11, 23, 26, and 32 are electrical signals. Electrical-to-optical converter (Elo) that converts signals into optical signals, 12.21.
28 and 31 are optical-to-electrical converters (0/E) that convert optical signals into electrical signals; 13 and 33 are FM demodulators (DEM) that extract pulse signals from FM signals; 14 and 3
4 is a detector (DET) that detects the pulse signals taken out from the FM demodulators 13 and 34, respectively; 22 and 27 are amplifiers that amplify the electrical signals; and 24 is a generator that generates a pulse signal specific to the optical PCM repeater 2. Signal generator (SG)
, and 25 is a pulse signal F which is generated by the signal generator 24.
This is an FM modulator (MOD) that performs M modulation.
なお、光ＰＣＭ中継器２は一方の端局１と他方の端局２
との間に設けられる複数個のうちの１個のみを示したも
のであり、これと同じ構成のものが一方の端局１と他方
の端局３との間に複数個設けられている。Note that the optical PCM repeater 2 has one terminal station 1 and the other terminal station 2.
Only one of the plurality of terminals provided between the terminal station 1 and the terminal station 3 is shown, and a plurality of terminal stations having the same configuration are provided between one terminal station 1 and the other terminal station 3.
また光−電気変換器２１および同２８ならびに電気−光
変換器２３および同２６には、それぞれ、出力が所定範
囲を越えたとき警報信号として２値信号の“１”を発生
する手段が設けられている。Further, the optical-to-electrical converters 21 and 28 and the electric-to-optical converters 23 and 26 are each provided with means for generating a binary signal of "1" as an alarm signal when the output exceeds a predetermined range. ing.
第２図は信号発生器２４の詳細な構成例を示したもので
あり、４１ば光−電気変換器２１および同２８ならびに
電気−光変換器２３および同２６が発生する警報信号の
論理和を出力する０Ｒ回路、４２は５０１１ｚのパルス
信号を発生するパルス発生器（ＰＧ） 、 ４３はパル
ス発生器４２が発生ずるパルス信号を、第３図ｔａ＋お
よびｆｂｌに例示するように２００ｍ５毎に所定個数ず
つ連続して出力し、この連続個数を複数の光ＰＣＭ中継
器毎に固有の値とＪ−ることによって光ＰＣＭ中継器毎
に固有のノ々ルス信号に変換する変換器（ＣＯＮＶ）、
４４はＯＲ回路４１の出力信号とパルス発生器４２の出
力信号と変換器４３の出力信号との論理積を出力するＡ
ＮＤ回路である。FIG. 2 shows a detailed configuration example of the signal generator 24, in which the logical sum of the alarm signals generated by the optical-to-electrical converters 21 and 28 and the electric-to-optical converters 23 and 26 is shown in FIG. 42 is a pulse generator (PG) that generates a 5011z pulse signal, 43 is a pulse generator (PG) that generates a pulse signal of 5011z, and 43 is a pulse generator that outputs a predetermined number of pulse signals every 200 m5 as illustrated in FIG. 3 ta+ and fbl. a converter (CONV) that converts the continuous number into a signal unique to each optical PCM repeater by converting the continuous number to a unique value for each of the plurality of optical PCM repeaters;
44 is A that outputs the logical product of the output signal of the OR circuit 41, the output signal of the pulse generator 42, and the output signal of the converter 43;
It is an ND circuit.
以上のような構成によって、光−電気変換器２１・同２
８・電気−光変換器２３−同２６・増幅器２２および同
２７．その他、光ＰＣＭ中継器に異常が生し。With the above configuration, the optical-to-electrical converters 21 and 2
8.Electro-optical converters 23-26.Amplifiers 22 and 27. In addition, an abnormality occurred in the optical PCM repeater.
光−電気変換器２１・同２８・電気−光変換器２３ある
いは同２６の何れかの出力が所定範囲を越え警報信号“
１”を発生ずると、信号発生器２４は各光ＰＣＭ中継器
２に固有のパルス信号を発生ずる。If the output of any of the optical to electrical converters 21, 28, electrical to optical converters 23, or 26 exceeds a predetermined range, an alarm signal is generated.
1'', the signal generator 24 generates a pulse signal unique to each optical PCM repeater 2.
パルス信号発生器２４が発生したパルス信号は。The pulse signal generated by the pulse signal generator 24 is as follows.
ＦＭ変調器２５によって主信号に重畳できるＦＭ信号に
変調され、電気−光変換器２３および同２６を介し上り
および下りの主信号に重畳される。The signal is modulated by the FM modulator 25 into an FM signal that can be superimposed on the main signal, and is superimposed on the upstream and downstream main signals via the electro-optic converters 23 and 26.
このようにして主信号に重畳されたパルス信号は、一方
の端局ｌあるいは他方の端局３において。The pulse signal superimposed on the main signal in this way is transmitted to one terminal station 1 or the other terminal station 3.
それぞれＦＭ復調器１３あるいは同３３によって復調さ
れたのち検出器１４あるいは同３４によって検出され、
同時に光ＰＣＭ中継器２毎の固有のパルス信号によって
異常のあった光ＰＣＭ中継器を判別することができる。After being demodulated by the FM demodulator 13 or 33, they are detected by the detector 14 or 34, respectively,
At the same time, the optical PCM repeater in which the abnormality has occurred can be determined based on the unique pulse signal of each optical PCM repeater 2.
上記実施例では、ＦＭ変調器２５が発生するＦＭ信号を
、電気−光変換器２４および同２６を介し−ヒリお、１
゛び１・りの４−信号に重畳しているので、同時に光１
’ （： Ｍ中継器の界雷を一方の端局］および他方の
）°ｆに１局；）において検出することができるととも
に。In the above embodiment, the FM signal generated by the FM modulator 25 is transmitted through the electro-optic converters 24 and 26 to 1.
Since it is superimposed on the 4-signal of light 1 and light 1,
'(: Field lightning of M repeaters can be detected at one end station] and the other) °f;
電気−光変換器２３または電気−光変換器２６が界雷の
場合でも端局１または端局３の何れかにおいて検出する
ことができる。Even if the electro-optical converter 23 or the electro-optical converter 26 is a field lightning, it can be detected at either the terminal station 1 or the terminal station 3.
また、卜゛Ｍ変調器２５およびＦＭ復調器１３および同
３３は、打合ゼ回線用等のために既設されているものを
用いることによって回路構成を簡略化することができる
。Furthermore, the circuit configuration can be simplified by using existing FM modulators 25 and FM demodulators 13 and 33 that are already installed for meeting lines and the like.
（ｇ）発明の効果
Ｉｔｌ ＋ 、実施例によっ′ζ説明Ｌ７たように１本
発明４二、１−れは、光ＰＣＭ中継器の異品警報を主信
号に重畳するＦＭ信号によって検出するので、信頼度が
１１１１ ＜Ｈつ安（１１１ｉな装置によって光ＰＣＭ
中継器のｙ？：’１Ｍ’＋を確実に監視することができ
る。(g) Effects of the invention Itl+, according to the embodiment'ζExplanation L7 1 The present invention 4 2. 1- This is to detect the foreign product alarm of the optical PCM repeater by the FM signal superimposed on the main signal. Therefore, the reliability is 1111
Repeater y? :'1M'+ can be reliably monitored.
第１図る、１本発明−実施例の（７４成を示ずずブロッ
ク図、第２図は同実施例の一部要素の６′６細な構成例
、また第３図は同一部要素の動作説明図である。
図中、１は一方の端局、２は光ＰＣＭ中継器。
３は他方の端局、２１および２８は光−電気変換器。
２３および２６は電気−光変換器、２４は信号発生器。
２５はＦＭ変調器、１３および３３はＦＭ復調器、１４
および３４は検出器である。
１？（”１
竿２圓
寥３ 悶
（匈Fig. 1 is a block diagram (not showing the structure) of the present invention - an embodiment, Fig. 2 is a 6'6 detailed configuration example of some elements of the same embodiment, and Fig. 3 is a block diagram of the same elements. It is an explanatory diagram of operation. In the figure, 1 is one terminal station, 2 is an optical PCM repeater. 3 is the other terminal station, 21 and 28 are optical-to-electrical converters. 23 and 26 are electric-to-optical converters, 24 is a signal generator. 25 is an FM modulator, 13 and 33 are FM demodulators, 14
and 34 is a detector. 1? ("1 pole 2 yenbai 3 agony (匈)
Claims (1)
光変換器の少なく、とも何れかが発生ずる警報信号によ
って光ＰＣＭ中継器毎に固有のパルス信号を発生する信
号発生器と、光ＰＣＭ中継器に設けられ前記信号発生器
が発生するパルス信号をＦＭ変調するＦＭ変調器と、端
局に設けられ前記ＦＭ変変周周器よってＦＭ変調され主
信号に重畳された前記パルス信号を検出する検出器とを
備えることを特徴とする光ＰＣＭ中継器監視回路。An optical-to-electrical converter and an electrical converter installed in the optical PCM repeater
A signal generator that generates a unique pulse signal for each optical PCM repeater in response to an alarm signal generated by at least one of the optical converters; An optical PCM repeater comprising an FM modulator that performs FM modulation, and a detector that is provided at a terminal station and detects the pulse signal that is FM modulated by the FM frequency converter and superimposed on the main signal. monitoring circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58236806A JPS60127833A (en) | 1983-12-15 | 1983-12-15 | Optical pcm repeater supervisory circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58236806A JPS60127833A (en) | 1983-12-15 | 1983-12-15 | Optical pcm repeater supervisory circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60127833A true JPS60127833A (en) | 1985-07-08 |
Family
ID=17006055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58236806A Pending JPS60127833A (en) | 1983-12-15 | 1983-12-15 | Optical pcm repeater supervisory circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60127833A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62245827A (en) * | 1986-04-18 | 1987-10-27 | Fujitsu Ltd | Supervisory system for optical communication system fault |
| JPH0220129A (en) * | 1988-07-08 | 1990-01-23 | Kokusai Denshin Denwa Co Ltd <Kdd> | Monitoring system for light repeater |
| US5428471A (en) * | 1992-07-30 | 1995-06-27 | Alcatel Network Systems, Inc. | Fail-safe automatic shut-down apparatus and method for high output power optical communications system |
-
1983
- 1983-12-15 JP JP58236806A patent/JPS60127833A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62245827A (en) * | 1986-04-18 | 1987-10-27 | Fujitsu Ltd | Supervisory system for optical communication system fault |
| JPH0220129A (en) * | 1988-07-08 | 1990-01-23 | Kokusai Denshin Denwa Co Ltd <Kdd> | Monitoring system for light repeater |
| US5428471A (en) * | 1992-07-30 | 1995-06-27 | Alcatel Network Systems, Inc. | Fail-safe automatic shut-down apparatus and method for high output power optical communications system |
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