JPS6338131B2 - - Google Patents
Info
- Publication number
- JPS6338131B2 JPS6338131B2 JP55161726A JP16172680A JPS6338131B2 JP S6338131 B2 JPS6338131 B2 JP S6338131B2 JP 55161726 A JP55161726 A JP 55161726A JP 16172680 A JP16172680 A JP 16172680A JP S6338131 B2 JPS6338131 B2 JP S6338131B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal device
- master station
- signal
- terminal
- transmission
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Description
【発明の詳細な説明】
本発明は片端が親局であり他端は終端装置にて
終端された複数のデータ伝送路と必要により該終
端装置に接続する端末装置より構成される通信シ
ステムに係り親局側にて終端装置に端末装置が接
続されているか否かを検出する伝送路終端状態検
出方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication system consisting of a plurality of data transmission lines, each of which has a master station at one end and a terminal device at the other end, and a terminal device which is connected to the terminal device as necessary. The present invention relates to a transmission path termination state detection method for detecting whether a terminal device is connected to a termination device on a master station side.
片端が親局であり他端は終端装置にて終端され
た複数のデータ伝送路と必要により該終端装置に
接続する端末装置より構成される通信システムで
は、端末装置より親局を介して別の端末装置をデ
ータを送受する必要があるが、この時親局におい
ては呼ばれている場所の終端装置に端末装置が接
続されているかを知つていてこれに対応する必要
がある。 In a communication system consisting of a plurality of data transmission paths, one end of which is a master station and the other end terminated by a terminating device, and a terminal device that is connected to the terminating device as necessary, data transmission from the terminal device to another via the master station is performed. It is necessary to send and receive data to and from a terminal device, but at this time, the master station needs to know whether the terminal device is connected to the terminal device at the called location and take appropriate action.
本発明の目的は片端が親局であり他端は終端装
置にて終端された複数のデータ伝送路と必要によ
り該終端装置に接続する端末装置より構成される
通信システムにおいて終端装置に端末装置が接続
されているか否かを遠隔地にある親局にて検出可
能な方式の提供にある。 The object of the present invention is to provide a communication system consisting of a plurality of data transmission lines, each having a master station at one end and a terminal device at the other end, and a terminal device connected to the terminal device as necessary. The purpose is to provide a method that allows a remote master station to detect whether or not it is connected.
本発明は上記の目的を達成するために、片端が
親局であり他端は終端装置により終端されたデー
タ伝送路を複数有し、各終端装置には必要により
端末装置が接続される通信システムにおいて、親
局にては、送信フレーム上の特定タイムスロツト
に特定パターンを挿入した送信信号を各終端装置
に送り各終端装置では、切替回路にて切り替える
ことにより、端末装置が接続されていなければこ
の信号を該親局に返送し、端末装置が接続されて
いれば、この信号を端末装置に送り、これを受信
した端末装置では、該送信フレーム上の特定タイ
ムスロツトに、該特定パターンとは別の特定パタ
ーンを挿入して終端装置を経由して該親局に送信
するようにするものである。 In order to achieve the above object, the present invention provides a communication system having a plurality of data transmission paths each having a master station at one end and a terminal device at the other end, each terminal device being connected to a terminal device as necessary. In this case, the master station sends a transmission signal with a specific pattern inserted into a specific time slot on the transmission frame to each terminal device, and each terminal device switches the transmission signal using a switching circuit to determine whether the terminal device is connected or not. This signal is sent back to the master station, and if a terminal device is connected, this signal is sent to the terminal device, and the terminal device that receives this signal displays the specific pattern in a specific time slot on the transmission frame. Another specific pattern is inserted and transmitted to the master station via the terminating device.
以下本発明の実施例につき図に従つて説明す
る。第１図は通信システムのブロツク構成図、第
２図は本発明の実施例で端末側のブロツク構成
図、第３図は本発明の切替回路の実施例、第４図
は本発明の実施例でＡは親局のＢは端末の送信フ
レームフオーマツトである。図中１は親局、２は
終端装置、３は端末装置、４は伝送路、５は切替
回路、６は親局よりの信号入力伝送路、７は親局
への信号出力伝送路、８は親局よりの信号入力端
子、９は端末装置からの送信信号入力端子、１０
は親局への信号出力端子、１１はアース端子にて
端末装置が接続されるとアースに落ちる。１２は
直流電圧供給端子、１３はNAND回路、１４は
NOT回路、１５は同期用フレームパターン、Ｘ，
Ｙは特定タイムスロツトにおける特定パターンで
ある。親局１では第４図Ａに示す如く送信フレー
ム上の特定タイムスロツトに特定パターンＸを挿
入し伝送路４を経て送信信号を常時各終端装置２
を経由して各端末装置３に送る。送る必要データ
があれば上記信号と一諸に送る。該信号を受信す
ると端末装置３では第４図Ｂに示す如く親局から
の信号と同一フレームパターンで送信フレーム上
の特定タイムスロツトに特定パターンＹを挿入し
て終端装置２を経由して親局１に送信する。又送
る必要データがあれば上記信号と一諸に送る。又
一方終端装置２では、回路内容は第３図に示す切
替回路５を有し、端末装置３が終端装置２に接続
されていれば端子１１を接地するし接続されてい
なければ端子１１を開放する。其の結果端末装置
３が接続されていれば端末装置からの送信信号入
力端子９より送り込まれる信号は親局への信号出
力端子１０を経伝送路７を経て親局に送られる。
親局よりの信号入力端子８に入つている親局より
の信号は親局へ出力されず端末装置３に送られ
る。一方端末装置３が接続されていない場合は、
親局よりの信号入力端子８に入つている親局から
の信号は、親局への信号出力端子１０を経、伝送
路７を経て、親局に返送される。親局１では送ら
れてきた信号の、第４図Ａ又はＢに示すフレーム
フオーマツトの特定タイムスロツトにおける特定
パターンＸ，Ｙにて終端装置２に端末装置３が接
続されているかどうかを検出出来る。親局では伝
送路の終端状況が判るので任意の端末装置からの
通信に対応出来る。例へばある端末装置が呼んで
いる場所の終端装置に端末装置が接続されていな
ければビジー信号を出す等が出来る。 Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a block configuration diagram of a communication system, Fig. 2 is an embodiment of the present invention and a block diagram of the terminal side, Fig. 3 is an embodiment of the switching circuit of the present invention, and Fig. 4 is an embodiment of the present invention. where A is the transmission frame format of the master station and B is the transmission frame format of the terminal. In the figure, 1 is a master station, 2 is a terminal device, 3 is a terminal device, 4 is a transmission line, 5 is a switching circuit, 6 is a signal input transmission line from the master station, 7 is a signal output transmission line to the master station, 8 9 is the signal input terminal from the master station, 9 is the transmission signal input terminal from the terminal device, 10
1 is a signal output terminal to the master station, and 11 is a ground terminal which is grounded when a terminal device is connected. 12 is a DC voltage supply terminal, 13 is a NAND circuit, and 14 is a
NOT circuit, 15 is a frame pattern for synchronization,
Y is a specific pattern in a specific time slot. The master station 1 inserts a specific pattern X into a specific time slot on the transmission frame as shown in FIG.
It is sent to each terminal device 3 via. If there is any data that needs to be sent, it is sent together with the above signal. Upon receiving the signal, the terminal device 3 inserts a specific pattern Y into a specific time slot on the transmission frame with the same frame pattern as the signal from the master station as shown in FIG. Send to 1. If there is any data that needs to be sent, it is sent together with the above signal. On the other hand, the terminal device 2 has a switching circuit 5 shown in FIG. 3, which grounds the terminal 11 when the terminal device 3 is connected to the terminal device 2, and opens the terminal 11 when the terminal device 3 is not connected. do. As a result, if the terminal device 3 is connected, the signal sent from the transmission signal input terminal 9 from the terminal device is sent to the master station via the signal output terminal 10 to the master station via the transmission line 7.
The signal from the master station that is input to the signal input terminal 8 from the master station is sent to the terminal device 3 without being output to the master station. On the other hand, if terminal device 3 is not connected,
A signal from the master station that is input to the signal input terminal 8 from the master station is sent back to the master station via the signal output terminal 10 to the master station, through the transmission line 7. The master station 1 can detect whether the terminal device 3 is connected to the terminal device 2 based on the specific patterns X and Y in the specific time slot of the frame format shown in FIG. 4 A or B of the sent signal. . Since the master station knows the termination status of the transmission path, it can handle communications from any terminal device. For example, if a terminal device is not connected to a terminal device at a location that a certain terminal device is calling, a busy signal can be issued.
本発明によれば親局にて終端装置に端末装置が
接続されているか否かが検出出来るので端末装置
から別の端末装置とデータを送受する場合に親局
にて適当な対応が出来る。又障害時の切分けにも
利用出来る効果がある。 According to the present invention, since the master station can detect whether or not a terminal device is connected to the terminating device, the master station can take appropriate measures when transmitting/receiving data from the terminal device to another terminal device. It also has the effect of being able to be used to isolate failures.
第１図は通信システムのブロツク構成図、第２
図は本発明の実施例で端末側のブロツク構成図、
第３図は本発明の切替回路の実施例、第４図は本
発明の実施例でＡは親局のＢは端末の送信フレー
ムフオーマツトである。
図中、１は親局、２は終端装置、３は端末装
置、４は伝送路、５は切替回路、６は親局よりの
信号入力伝送路、７は親局への信号出力伝送路、
８は親局よりの信号入力端子、９は端末装置から
の送信信号入力端子、１０は親局への信号出力端
子、１１はアース端子にて端末装置が接続される
とアースに落ちる。１２は直流電圧供給端子、１
３はNAND回路、１４はNOT回路、１５は同期
用フレームパターン、Ｘ，Ｙは特定タイムスロツ
トにおける特定パターンである。
Figure 1 is a block diagram of the communication system, Figure 2 is a block diagram of the communication system.
The figure shows a block configuration diagram of the terminal side in an embodiment of the present invention.
FIG. 3 shows an embodiment of the switching circuit of the present invention, and FIG. 4 shows an embodiment of the present invention, where A is the master station and B is the transmission frame format of the terminal. In the figure, 1 is a master station, 2 is a terminal device, 3 is a terminal device, 4 is a transmission line, 5 is a switching circuit, 6 is a signal input transmission line from the master station, 7 is a signal output transmission line to the master station,
8 is a signal input terminal from the master station, 9 is a transmission signal input terminal from the terminal device, 10 is a signal output terminal to the master station, and 11 is a ground terminal which is grounded when the terminal device is connected. 12 is a DC voltage supply terminal, 1
3 is a NAND circuit, 14 is a NOT circuit, 15 is a synchronization frame pattern, and X and Y are specific patterns in specific time slots.
Claims (1)
されたデータ伝送路を複数有し、各終端装置には
必要により端末装置が接続される通信システムに
おいて、 親局にては、送信フレーム上の特定タイムスロ
ツトに特定パターンを挿入した送信信号を各終端
装置に送り、各終端装置では、切替回路にて切り
替えることにより、端末装置が接続されていなけ
ればこの信号を該親局に返送し、端末装置が接続
されていれば、この信号を端末装置に送り、これ
を受信した端末装置では、該送信フレーム上の特
定タイムスロツトに、該特定パターンとは別の特
定パターンを挿入して終端装置を経由して該親局
に送信するようにしたことを特徴とする伝送路終
端状態検出方式。[Claims] 1. In a communication system that has a plurality of data transmission paths each having a master station at one end and a terminal device at the other end, each terminal device is connected to a terminal device as necessary. In this case, a transmission signal with a specific pattern inserted into a specific time slot on the transmission frame is sent to each terminal device, and each terminal device switches this signal to the corresponding terminal device if it is not connected by using a switching circuit. If the terminal device is connected, this signal is sent to the terminal device, and the terminal device that receives this signal sends a specific pattern different from the specific pattern to the specific time slot on the transmission frame. 1. A transmission path termination state detection method characterized in that a transmission path termination state is detected by inserting a terminating device and transmitting to the master station via a terminating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55161726A JPS5784644A (en) | 1980-11-17 | 1980-11-17 | Detection system of transmission line termination state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55161726A JPS5784644A (en) | 1980-11-17 | 1980-11-17 | Detection system of transmission line termination state |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5784644A JPS5784644A (en) | 1982-05-27 |
| JPS6338131B2 true JPS6338131B2 (en) | 1988-07-28 |
Family
ID=15740709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55161726A Granted JPS5784644A (en) | 1980-11-17 | 1980-11-17 | Detection system of transmission line termination state |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5784644A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11451063B2 (en) | 2018-07-27 | 2022-09-20 | Nissin Electric Co., Ltd. | Power supply system |
-
1980
- 1980-11-17 JP JP55161726A patent/JPS5784644A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11451063B2 (en) | 2018-07-27 | 2022-09-20 | Nissin Electric Co., Ltd. | Power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5784644A (en) | 1982-05-27 |
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