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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