JPH0398323A - Data communication equipment - Google Patents
Data communication equipmentInfo
- Publication number
- JPH0398323A JPH0398323A JP23469389A JP23469389A JPH0398323A JP H0398323 A JPH0398323 A JP H0398323A JP 23469389 A JP23469389 A JP 23469389A JP 23469389 A JP23469389 A JP 23469389A JP H0398323 A JPH0398323 A JP H0398323A
- Authority
- JP
- Japan
- Prior art keywords
- data
- communication
- terminal equipment
- normality
- communication satellite
- 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
- 238000004891 communication Methods 0.000 title claims abstract description 55
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、通信衛星装置を利用したデータ通信装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication device using a communication satellite device.
従来の半二重通信方式の通信装置で通信回路の折返し試
験を行なう場合、２回線分の通信装置（端末装置とセン
タに設置）を用意し、遠隔地の通信装置（端末）からの
折返し信号により折返し状態とし、センタの通信装置を
送信状態、端末装置の通信装置を受信状態にして、一方
向性折返し試験を行ない、伝送路の正常性を確認する手
段をとっていた。When performing loopback tests on communication circuits using conventional half-duplex communication equipment, prepare communication equipment for two lines (installed at the terminal and at the center), and test the loopback signal from the communication equipment (terminal) at a remote location. The communication device at the center is set to a transmitting state, and the communication device at the terminal device is set to a receiving state, and a unidirectional loopback test is performed to confirm the normality of the transmission path.
上記従来の通信装置で折返し試験を行なう場合２回線分
の通信装置が必要となり、設備コスト面で高価であった
。通信装置を例えば１回線で運用するシステムの場合で
も、折返し試験のために対となる通信装置を用意する必
要があり、不便であった。When carrying out a return test using the conventional communication device described above, a communication device for two lines is required, which is expensive in terms of equipment cost. Even in the case of a system in which the communication device is operated using, for example, one line, it is necessary to prepare a paired communication device for loopback testing, which is inconvenient.
本発明の目的は、上記のような従来の問題を解決するも
のであり、半二重通信方式の通信方式の通信装置が有す
る単一の通信装置によって伝送路の正常性を確認できる
ようにした通信衛星用データ通信装置を安価に提供する
ことにある。An object of the present invention is to solve the above-mentioned conventional problems, and to make it possible to check the normality of a transmission path using a single communication device included in a communication device using a half-duplex communication method. An object of the present invention is to provide a data communication device for a communication satellite at low cost.
上記目的を達威するために、本発明が提供する通信衛星
用データ通信装置は端末とセンタとを通−１−
２
信衛星回路を介して接続する半二重通信方式のデータ通
信システムで前記端末は前記通信衛星に向けて端末の所
定のデータを送出した後、所定時間経過して端末を送信
状態から受信状態に切り換え、前記通信衛星から送られ
る前記所定のデータを受信してその正常性をチェックす
るようにしたものである。In order to achieve the above object, the present invention provides a data communication device for a communication satellite, which is a half-duplex data communication system in which a terminal and a center are connected via a communication satellite circuit. After transmitting predetermined data of the terminal toward the communication satellite, the terminal switches from the transmitting state to the receiving state after a predetermined period of time has elapsed, receives the predetermined data sent from the communication satellite, and determines its normality. This is to check.
上記構或の通信衛星を利用した端末とセンタからなるデ
ータ通信装置によれば，前記端末は前記通信衛星に向け
て端末の所定のデータを送出した後、端末を通信状態か
ら受信状態に切り換え、前記通信衛星から送られる前記
所定のデータを受信してその正常性をチェックする作用
をする。According to the data communication device comprising a terminal and a center using a communication satellite having the above structure, the terminal transmits predetermined data of the terminal toward the communication satellite, and then switches the terminal from a communication state to a reception state, It functions to receive the predetermined data sent from the communication satellite and check its normality.
次に本発明の一実施例について図面を参照して説明する
。Next, an embodiment of the present invention will be described with reference to the drawings.
第上図は、本発明のデータ通信装置の一実施例を示す構
或図である。The upper figure is a configuration diagram showing an embodiment of a data communication device of the present invention.
第工図において、半二重通信方式の図示しない通信装置
を内蔵する端末装置１は、通信装置から送出されたデジ
タル信号から構或される所定のデタ（例えば端末をチェ
ックするテスト信号）は地上局２から、通信衛星３に送
られる。通信衛星３は、受信した所定のテータを再び地
上に返送する。この場合受信地上局の宛先が地上局４で
あれば、この地上局４が送られた所定データを受信し、
センタ５がこの所定データを受信することになる。In the first construction drawing, a terminal device 1 having a built-in half-duplex communication device (not shown) transmits predetermined data (for example, a test signal for checking the terminal) composed of digital signals sent from the communication device to the ground. It is sent from station 2 to communication satellite 3. The communication satellite 3 sends the received predetermined data back to the ground. In this case, if the destination of the receiving ground station is ground station 4, this ground station 4 receives the sent predetermined data,
The center 5 will receive this predetermined data.
通常の端末からセンタ５へのデータ通信は以上のように
行なわれるが、この地上局２または４から通信衛星３ま
でデータの到達時間は約２５０ｍｓにもなる。このため
伝搬遅延時間により例えば端末装置１が自身の所定デー
タを送信することにより、通信衛星３は端末装置１より
送られた所定データを再び地上に返送し、地上局４がこ
の所定データを受信する。これにより、端末装ｗ１は自
身の所定データ送信後自身の所定データが戻って来るま
での間に自身を受信状態に切り換え、端末装置１内のタ
イマにより、自身宛データの折返しを監視し、自身宛デ
ータを受信したときに、受信し−３
た所定データをチェックする。端末装置１のタイマタイ
ムアウトによる異常または受信した自身宛の所定データ
チェック結果により、伝送路の正常性を確認する。Normal data communication from the terminal to the center 5 is performed as described above, but the time it takes for data to reach the communication satellite 3 from the ground station 2 or 4 is about 250 ms. Therefore, due to the propagation delay time, for example, when the terminal device 1 transmits its own predetermined data, the communication satellite 3 returns the predetermined data sent from the terminal device 1 to the ground again, and the ground station 4 receives this predetermined data. do. As a result, the terminal device w1 switches itself to a receiving state after transmitting its own predetermined data and until its own predetermined data is returned, monitors the return of the data addressed to itself using the timer in the terminal device 1, and When the destination data is received, the received predetermined data is checked. The normality of the transmission path is confirmed based on an abnormality due to a timer timeout of the terminal device 1 or a check result of the received predetermined data addressed to itself.
本発明によれば、半二重通信方式の端末装置に内蔵の単
一の通信装置によって折返し試験ができるので，少ない
ハードウエアで伝送路の正常性をチェックできる効果が
ある。According to the present invention, since a loopback test can be performed using a single communication device built into a half-duplex communication terminal device, the normality of a transmission path can be checked with less hardware.
第１図は本発明のデータ通信装置の一実施例を示す構或
図である。
１・・・端末装置、２，４・・・地上局、３・・通信衛
星、５・・・センタ。
４−
第１図FIG. 1 is a block diagram showing an embodiment of a data communication device according to the present invention. 1...Terminal device, 2, 4...Ground station, 3...Communication satellite, 5...Center. 4- Figure 1
Claims (1)
する半二重通信方式のデータ通信装置において、前記端
末装置は前記通信衛星に向けて端末装置の所定のデータ
を送出した後、所定時間を経過して端末装置を送信状態
から受信状態に切り換え、前記通信衛星から送られる前
記所定のデータを受信してその正常性をチェックするこ
とを特徴とするデータ通信装置。(1) In a half-duplex data communication device that connects a terminal device and a center via a communication satellite line, the terminal device transmits predetermined data of the terminal device to the communication satellite, and then sends predetermined data to the communication satellite. A data communication device characterized in that a terminal device is switched from a transmitting state to a receiving state after a period of time, receives the predetermined data sent from the communication satellite, and checks its normality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23469389A JPH0398323A (en) | 1989-09-12 | 1989-09-12 | Data communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23469389A JPH0398323A (en) | 1989-09-12 | 1989-09-12 | Data communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0398323A true JPH0398323A (en) | 1991-04-23 |
Family
ID=16974939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23469389A Pending JPH0398323A (en) | 1989-09-12 | 1989-09-12 | Data communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0398323A (en) |
-
1989
- 1989-09-12 JP JP23469389A patent/JPH0398323A/en active Pending
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