JPH0275243A - Monitor system - Google Patents

Monitor system

Info

Publication number
JPH0275243A
JPH0275243A JP63226909A JP22690988A JPH0275243A JP H0275243 A JPH0275243 A JP H0275243A JP 63226909 A JP63226909 A JP 63226909A JP 22690988 A JP22690988 A JP 22690988A JP H0275243 A JPH0275243 A JP H0275243A
Authority
JP
Japan
Prior art keywords
carrier
state
master station
monitor
station modem
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.)
Granted
Application number
JP63226909A
Other languages
Japanese (ja)
Other versions
JPH0716194B2 (en
Inventor
Toru Ogawa
透 小川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP63226909A priority Critical patent/JPH0716194B2/en
Publication of JPH0275243A publication Critical patent/JPH0275243A/en
Publication of JPH0716194B2 publication Critical patent/JPH0716194B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To ensure the network management by keeping the state at carrier reception during carrier interruption in the normal state. CONSTITUTION:The system is provided with a master station MODEM 2 connecting to a center 1, plural slave station MODEMs 6 connecting to the master station MODEM 2, a monitor 13 provided to the master station MODEM 2, a detection means 20 detecting the line state, a hold means 17 holding a monitored value detected by the detection means 20 and a converging means 19 converting the monitored value gradually. The monitored value representing the state in the carrier reception is held for a prescribed time during the carrier interruption in the normal state and the monitored value is gradually approached to the state of carrier interruption in the abnormal state where the carrier interruption exceeds a prescribed time. Thus, the carrier interruption in the normal state is not discriminated erroneously as the data communication disable state and the normal network management is attained.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、マルチポイン1〜通信システムにおするモニ
タ方式に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a monitoring method for a multi-point communication system.

近年、データ通信システムにおいては、データ通信の信
頼性を向上させるためにデータ通信のみならず、ネット
ワーク管理を行なうようになっている。
In recent years, in data communication systems, in order to improve the reliability of data communication, not only data communication but also network management has been performed.

このネットワーク管理を実現するためには、■回線品質
、■受信レベル、■周波数オフゼッ1へ、■データ端末
装置(DTF)に入る信号などの状態をモニタすること
が必要である。
In order to realize this network management, it is necessary to monitor the conditions of (1) line quality, (2) reception level, (2) frequency offset, and (2) signals entering the data terminal equipment (DTF).

一方、マルチポイン[へ接続される親局モデムは多くの
子局モデムからの信号を受信する必要−に、受信信号が
断となる時間か例えば数fms間存在する。
On the other hand, the master station modem connected to the multipoint must receive signals from many slave station modems, so there is a period of time, for example, several fms, during which the received signal is interrupted.

このため、キャリアを受信していないときの状態をその
ままモニタすると、データ通信不能とまちがって判断す
る恐れがある。したかって、キャリア断の状態とデータ
通信不能を確実に判別覆ることが、ネッ1〜ワーク管理
上必要となる。
For this reason, if the status when the carrier is not being received is directly monitored, there is a risk of mistakenly determining that data communication is not possible. Therefore, it is necessary for network management to reliably distinguish between carrier disconnection and data communication failure.

[従来の技術] 従来、センタに接続される親局モデムに専用回線を介し
て複数個の子局モデムがマルチポイント接続されるマル
チポイント通信システムにおっては、親局、子局モデム
に設けたモニタにAGC(オートマチック・ゲイン・ロ
ン]〜ロール)回路、SQD (ジグプル・クォリティ
・デ′イテクト)回路、オフセラ1〜検出回路などを設
けて、受信レベル、回線品質、周波数オフセラlへなど
の状態をモニタし、これよりネットワーク管理を実現す
るようにしている。
[Prior Art] Conventionally, in a multipoint communication system in which a plurality of slave station modems are multi-point connected to a master station modem connected to a center via a dedicated line, The monitor is equipped with an AGC (automatic gain long/roll) circuit, an SQD (zig-pull quality detector) circuit, an off-cellar 1-detection circuit, etc., to determine the reception level, line quality, frequency offset, etc. The status is monitored and network management is implemented from now on.

[発明か解決しようとする課題] しかしなから、このような従来のモニタ方式にあっては
、親局−[デムでは多くの子局モデムからの信号を受信
する必要上受信信号が断となる時間が存在するため、キ
ャリアを受信していないときの状態をそのままモニタす
ると、キャリア断の状態をデータ通信不能とまちがって
判断することがあった。その結果、ネッ1へワーク管理
を確実に行なうことができないという問題点かあった。
[Problem to be solved by the invention] However, in such a conventional monitoring method, the receiving signal is interrupted because the master station must receive signals from many slave station modems. Since there is a time difference, if the status when the carrier is not being received is monitored as it is, the carrier-disconnected status may be mistakenly determined to be the inability to communicate data. As a result, there was a problem that network 1 could not be reliably managed.

本発明は、このような従来の問題点に尤みてなされたも
のであって、正常時におけるキャリア断の間、キャリア
受信時の状態を保持づ−ることによりネットワーク管理
を確実に行なうことかでさるモニタ方式を提供すること
を目的としている。
The present invention has been made in view of these conventional problems, and it is possible to perform network management reliably by maintaining the state at the time of carrier reception during carrier disconnection during normal operation. The purpose is to provide a simple monitoring method.

[課題を解決するための手段] 第1図は、本発明の原理説明図である。[Means to solve the problem] FIG. 1 is a diagram explaining the principle of the present invention.

第1図において、2はセンタ1に接続される親局モデム
、6は該親局モデム2に接続される複数個の子局モデム
、13は親局モデム2に設りた十二夕、20は回線状態
を検出部る検出手段、17は該検出手段20で検出した
モニタ値をホールトするホールド手段、19は前記モニ
タ値を徐々に収束させる収束手段である。
In FIG. 1, 2 is a master station modem connected to the center 1; 6 is a plurality of slave station modems connected to the master station modem 2; Reference numeral 17 indicates a detection means for detecting the line state; 17 indicates a holding means for holding the monitor value detected by the detection means 20; and 19 indicates a convergence means for gradually converging the monitor value.

r作用] 本発明においては、正常時におCjるキャリア断のあい
だはキャリア受信時の状態を示1モニタ舶を一定時間ホ
ールドし、キャリフッ断か一定時間を越える異常時には
モニタ値をキャリア断の状態に徐々に近づ【プていくよ
うにしたため、正常時のキャリア断をデータの通信不能
と誤って判断することがない。
In the present invention, during normal carrier disconnection, one monitor vessel is held for a certain period of time to indicate the state at the time of carrier reception, and when the carrier is disconnected or abnormally exceeds a certain period of time, the monitor value is changed to the carrier disconnection state. Since the carrier is gradually approached, there is no possibility of incorrectly determining that a carrier disconnection during normal operation is due to an inability to communicate data.

その結果、正常なネットワーク管理を行なうことが可能
となる。
As a result, normal network management can be performed.

[実施例] 以下、本発明の実施例を図面に基づい゛C説明する。[Example] Embodiments of the present invention will be described below based on the drawings.

第2図は本発明を実施するだめの通信システムを示す図
である。
FIG. 2 is a diagram showing a communication system for implementing the present invention.

第2図において、1はセンタ、2は親局モデムであり、
センタ1と親局モデム2はデータ端末装置(以下、DI
E>3.4を介して接続されている。親局モデム2には
専用回線5を介して複数個の子局モデム6がそれぞれ接
続され、子局モデム6にはキーボードなどの端末7がそ
れぞれ接続されている。
In Fig. 2, 1 is the center, 2 is the master station modem,
The center 1 and the master station modem 2 are data terminal devices (hereinafter referred to as DI).
Connected via E>3.4. A plurality of slave station modems 6 are each connected to the master station modem 2 via a dedicated line 5, and a terminal 7 such as a keyboard is connected to each slave station modem 6.

子局モデム6は、第3図に示すように、復変調= 5− を行なうモデム部8と、該モデム部8およびD−1−E
9をモニタするモニタ10を有している。
As shown in FIG. 3, the slave station modem 6 includes a modem section 8 that performs demodulation = 5-, and a modem section 8 and D-1-E.
It has a monitor 10 for monitoring 9.

11はアラーム検出部であり、モニタ10の出力状態は
アラーム検出部11て検出される。
11 is an alarm detection section, and the output state of the monitor 10 is detected by the alarm detection section 11.

一方、親局モデム2は、第4図に示すように、復変調を
行なうモデム部12と、回線状態をモニタするモニタ1
3を有している。モニタ13は、受信レベルを一定レベ
ルに保っAGC回路14と、回線品質を検出するSQD
回路15と、周波数オフセットを検出するオフセット検
出回路16と、AGC回路14、SQD回路15および
オフセット検出回路16の各出力を一定時間ホールトす
るホールド回路(ホールド手段〉17と、ホールド手段
17に一定時間をセットするタイマー18と、AGC回
路14、SQD回路15およびオフセット検出回路16
の各出力をキャリア断時の状態に徐々に近づけていく収
束回路(収束手段)19と、を有している。
On the other hand, as shown in FIG. 4, the master station modem 2 includes a modem section 12 that performs demodulation and a monitor 1 that monitors the line status.
It has 3. The monitor 13 includes an AGC circuit 14 that keeps the reception level at a constant level, and an SQD circuit that detects line quality.
A circuit 15, an offset detection circuit 16 that detects a frequency offset, a hold circuit (hold means) 17 that holds each output of the AGC circuit 14, SQD circuit 15, and offset detection circuit 16 for a certain period of time; a timer 18 for setting, an AGC circuit 14, an SQD circuit 15, and an offset detection circuit 16.
and a convergence circuit (convergence means) 19 that gradually brings each output of the circuit closer to the state at the time of carrier disconnection.

なあ、AGC回路14、SQD回路15おにびオフセッ
ト検出回路16が全体として回線状態を検出する検出手
段20を構成している。
Incidentally, the AGC circuit 14, the SQD circuit 15, and the offset detection circuit 16 collectively constitute a detection means 20 for detecting the line state.

次に、本発明のモニタ方式を説明する。Next, the monitoring method of the present invention will be explained.

まず、受信キャリア断直後の場合には、AGC回路14
、SQD回路15およびオフセット検出回路16の各出
力をキャリア受信時の状態でホールト回路17にて保持
する。ここで、キャリア検出信号(CD)がオフとなれ
ばモニタ値をそのままホールドし、CDがオンのままで
おれば、モニタ値のホールドを解除する。
First, immediately after the reception carrier is cut off, the AGC circuit 14
, the outputs of the SQD circuit 15 and the offset detection circuit 16 are held in the halt circuit 17 in the state at the time of carrier reception. Here, if the carrier detection signal (CD) is turned off, the monitor value is held as is, and if CD remains on, the hold of the monitor value is released.

次に、受信キャリア断が正常の場合には、ホールド回路
17でモニタ値をそのまま保持し、CDがオン時にはモ
ニタ値のボールドを解除する。
Next, if the reception carrier disconnection is normal, the hold circuit 17 holds the monitor value as it is, and cancels the bold of the monitor value when the CD is on.

すなわち、第5図に示ずように、受信キャリアが第5図
(a)で示すような場合には、モニタ値か第5図(b)
の点線Cて示1」;うに、キャリア受信時の状態を保持
する。
That is, as shown in FIG. 5, if the received carrier is as shown in FIG. 5(a), the monitor value or the value shown in FIG. 5(b) is
As indicated by the dotted line C, the state at the time of carrier reception is maintained.

次に、受信キャリア断か異常で、一定時間を越える場合
には、収束回路19によりモニタ値をキャリア断時の状
態に徐々に近づ(プていく。そして、CDオフ後のある
時間を間にキャリア断の状態となるにうにするく第6図
(a)、(b)、参照)。
Next, if the reception carrier is cut off or abnormally and exceeds a certain period of time, the convergence circuit 19 gradually approaches the monitor value to the state at the time of carrier cutoff. (See Figures 6(a) and (b)).

したがって、親局モデム2において、受信信号か断とな
る時間が数+ms間存在しても、この間キャリア受信時
の状態をホールドしているので、このキャリア断をデー
タの通信不能と誤って判断することがない。また、一定
時間のタイムアウI〜後のモニタ値を少しづつキャリア
断の状態に近づけるようにしたため、キャリア断の時間
をシビアに定める必要もない。
Therefore, even if the received signal is disconnected for several + ms in the master station modem 2, the state at the time of carrier reception is held during this period, so this carrier disconnection is mistakenly judged as an inability to communicate data. Never. Furthermore, since the monitor value after a certain period of time-out I is gradually brought closer to the carrier disconnection state, there is no need to strictly determine the carrier disconnection time.

その結果、マルチポイント通信システムにおいて、ネッ
トワーク管理を確実に行なうことができる。
As a result, network management can be performed reliably in the multipoint communication system.

[発明の効果] 以上説明してきたように、本発明によれば、正常時にお
けるキャリア断時のあいだキャリア受信時の状態をホー
ルドし、キャリア断の異常時にはモニタ値を徐々にキャ
リア断の状態に近づけるようにしたため、キャリア断を
データ通信不能と間違って判断することがなく、ネット
ワーク管理を確実に行なうことか可能となる。
[Effects of the Invention] As described above, according to the present invention, the state at the time of carrier reception is held during a carrier disconnection in normal conditions, and the monitor value is gradually changed to the carrier disconnection state during an abnormal carrier disconnection. Since the terminals are brought closer to each other, there is no possibility of mistakenly determining that a carrier disconnection is impossible for data communication, and network management can be performed reliably.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の原理説明図、 第2図は本発明を実施するための通信システムを示す図
、 第3図は子局モデムの構成図、 第4図は親局モデムの構成図、 第5図はキャリア断正常時の説明図、 第6図はキ【7リラノ断安常時の説明図である。 図中、 1・・・センタ 2・・・親局モデム、 3.4.9・・・D丁F、 5・・・専用回線、 6・・・子局モデム、 7・・・端末、 8・・・モデム部、 10・・・モニタ、 11・・・アラーム検出回路、 12・・・モデム部、 13・・・モニタ、 14・・・AGC回路、 15・・・SQD回路、 16・・・オフセット検出回路、 17・・・ホールド回路(ホールド手段)、1B・・・
タイマー、 19・・・収束回路(収束手段)、 20・・・検出手段。
FIG. 1 is a diagram explaining the principle of the present invention; FIG. 2 is a diagram showing a communication system for implementing the present invention; FIG. 3 is a configuration diagram of a slave station modem; FIG. 4 is a configuration diagram of a master station modem; Fig. 5 is an explanatory diagram when the carrier is normally disconnected, and Fig. 6 is an explanatory diagram when the carrier is normally disconnected. In the figure, 1... Center 2... Master station modem, 3.4.9... D-F, 5... Dedicated line, 6... Slave station modem, 7... Terminal, 8 ...Modem section, 10...Monitor, 11...Alarm detection circuit, 12...Modem section, 13...Monitor, 14...AGC circuit, 15...SQD circuit, 16...・Offset detection circuit, 17...Hold circuit (hold means), 1B...
Timer, 19... Convergence circuit (convergence means), 20... Detection means.

Claims (1)

【特許請求の範囲】[Claims] センタ(1)に接続される親局モデム(2)と、該親局
モデム(2)に接続される複数個の子局モデム(6)と
、を備えたマルチポイント通信システムにおいて、前記
親局モデム(2)に設けたモニタ(13)に、回線状態
を検出する検出手段(20)と、該検出手段(20)で
検出したモニタ値をホールドするホールド手段(17)
と、前記モニタ値を徐々に収束させる収束手段(19)
とを設け、キャリア断時には前記モニタ値を一定時間ホ
ールドし、一定時間を越えるときは前記モニタ値をキャ
リア断の状態に徐々に近づけていくようにしたことを特
徴とするモニタ方式。
In a multipoint communication system comprising a master station modem (2) connected to a center (1) and a plurality of slave station modems (6) connected to the master station modem (2), the master station A monitor (13) provided in the modem (2) includes a detection means (20) for detecting the line state and a hold means (17) for holding the monitor value detected by the detection means (20).
and convergence means (19) for gradually converging the monitor value.
A monitoring system characterized in that the monitor value is held for a certain period of time when the carrier is cut off, and when the fixed time is exceeded, the monitor value is gradually brought closer to the carrier cut-off state.
JP63226909A 1988-09-09 1988-09-09 Monitor method Expired - Fee Related JPH0716194B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63226909A JPH0716194B2 (en) 1988-09-09 1988-09-09 Monitor method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63226909A JPH0716194B2 (en) 1988-09-09 1988-09-09 Monitor method

Publications (2)

Publication Number Publication Date
JPH0275243A true JPH0275243A (en) 1990-03-14
JPH0716194B2 JPH0716194B2 (en) 1995-02-22

Family

ID=16852501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63226909A Expired - Fee Related JPH0716194B2 (en) 1988-09-09 1988-09-09 Monitor method

Country Status (1)

Country Link
JP (1) JPH0716194B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008155819A (en) * 2006-12-25 2008-07-10 Toyoda Gosei Co Ltd Console lid and manufacturing method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008155819A (en) * 2006-12-25 2008-07-10 Toyoda Gosei Co Ltd Console lid and manufacturing method therefor

Also Published As

Publication number Publication date
JPH0716194B2 (en) 1995-02-22

Similar Documents

Publication Publication Date Title
WO2006085356A1 (en) Light input break detection device
JPH0358635A (en) Optical repeater
US5293260A (en) Optical repeater off-state supervisory method and device therefor
JPH0275243A (en) Monitor system
JPS58170247A (en) Automatic loop back controlling system
US6265971B1 (en) Fiber-sync communications channel
JPH0524761A (en) Remotely monitoring device for elevator
JPH0735470Y2 (en) Loop type data transmission device
EP0388441B1 (en) Apparatus and method for a secure and diagnosable antijabber communication
JP2797418B2 (en) Transmission line disconnection monitoring device
JP2003069536A (en) Communication system
JPH0685770A (en) Defect detection system for transmission standby circuit
JPH0884116A (en) Optical transmitter
JPH02122730A (en) Signal line terminating system
JPH03258059A (en) Speed setting system
JPS61156928A (en) Automatic switch system of communication line
KR0174669B1 (en) Failure Detection Device in Sept Transmission Equipment
JPH01170244A (en) Fault supervision system for local area network
JPH02159841A (en) Receiver fault detector
JPH10126340A (en) Transmission line changeover method and system therefor
JP2748775B2 (en) Data line failure detection circuit
JP2577469B2 (en) Control method of optical star network
JPH0228941B2 (en)
JPH07264182A (en) Method for confirming communication data
JPH03104354A (en) Reception circuit for fs carrier transmission system

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees