JPH0398359A - Data modulator-demodulator - Google Patents
Data modulator-demodulatorInfo
- Publication number
- JPH0398359A JPH0398359A JP1236195A JP23619589A JPH0398359A JP H0398359 A JPH0398359 A JP H0398359A JP 1236195 A JP1236195 A JP 1236195A JP 23619589 A JP23619589 A JP 23619589A JP H0398359 A JPH0398359 A JP H0398359A
- Authority
- JP
- Japan
- Prior art keywords
- communication
- data transmission
- state
- modulation
- data
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000004891 communication Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Maintenance And Management Of Digital Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はデータ変復調装置に関し、特に通信障害を監視
するデータ変復調装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data modulation/demodulation device, and more particularly to a data modulation/demodulation device that monitors communication failures.
従来のデータ変復調装置において、誤り制御情報や伝送
制御情報によりデータ通信を行なう通信制御手順（プロ
トコル）が含まれている場合、通信を開始する時にはプ
ロトコルの設定を行う必要がある。If a conventional data modulation/demodulation device includes a communication control procedure (protocol) for performing data communication using error control information and transmission control information, it is necessary to set the protocol when starting communication.
上述した従来のデータ変復調装置において、誤り制御情
報や伝送制御情報によりデータ通信を行うプロトコルに
よるデータ通信中に通信が途絶えた場合、通信を再開す
るにはプロトコルの設定をデータ変復調装置に接続され
た端末により手動操作にて行なわなければならないとい
う問題点があった。In the conventional data modulation and demodulation equipment described above, if communication is interrupted during data communication using a protocol that performs data communication using error control information and transmission control information, in order to resume communication, the protocol settings must be changed to There was a problem in that it had to be done manually using a terminal.
本発明のデータ変復調装置は、送信データの変復調を行
う変復調部と、誤り制御情報や伝送情報によりデータ伝
送の制御手順の処理を行うプロトコル制御部と、変復調
部を監視し通信が途絶えたときに前記制御手順の初期化
を前記プロトコル制御部へ通知する変復調監視部とを有
している。The data modulation/demodulation device of the present invention includes a modulation/demodulation section that modulates and demodulates transmission data, a protocol control section that processes data transmission control procedures based on error control information and transmission information, and a modulation/demodulation section that monitors the modulation and demodulation section and detects when communication is interrupted. and a modulation/demodulation monitoring section that notifies the protocol control section of the initialization of the control procedure.
次に、本発明について図面を参照して説明する。第１図
は本発明の一実施例のブロック図である。Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention.
変復調部２は四線１からの受信データを復調し、プロト
コル制御部３へ送り、また、プロトコル制御部３から送
られた送信データを変調し、回線１へ送る。プロトコル
制御部３は変復調部２から送られた受信データに含まれ
る誤り制御情報を調べ、正しい場合にはデータ部分を端
末５へ送り、誤っている場合にはデータの再送信を要求
する制御情報をのせた送信データを変復調部２へ送る。The modulation/demodulation section 2 demodulates the received data from the four-wire 1 and sends it to the protocol control section 3, and also modulates the transmission data sent from the protocol control section 3 and sends it to the line 1. The protocol control unit 3 checks the error control information included in the received data sent from the modulation/demodulation unit 2, and if it is correct, sends the data part to the terminal 5, and if it is incorrect, it sends control information that requests retransmission of the data. The transmission data loaded with is sent to the modulation/demodulation section 2.
また、データ伝送の開始や終了の制御情報を対向する変
復調装置のプロトコル制御部と交信するために、制御情
報を変復調部２との間で送受信する。Further, control information is transmitted and received with the modulation/demodulation section 2 in order to communicate control information for starting and ending data transmission with the protocol control section of the opposing modulation/demodulation device.
このようにすると、正常にデータ伝送が行なわれている
場合は、回線１上に搬送波が常に出ている。そしてプロ
トコル制御部３は対向する変復調装置との間でデータ伝
送開始処理の交信を完了した状態である。この状態で回
線の異常または対向する変復調装置の電源断などにより
搬送波が切断された後に搬送波を再び受信した場合、対
向する変復調装置はデータ伝送開始処理の交信をプロト
コル制御部３と行おうとするが、プロトコル制御部３で
はデータ伝送開始処理を完了しており、それを受け入れ
ることができない。そこで搬送波が切断された時には変
復調監視部４が搬送波の切断を検出し、プロトコル制御
部３へ通知する。この通知を受けるとプロトコル制御部
３はプロトコルの初期化、つまり、データ伝送開始処理
の完了したデータ伝送が可能な状態を解除し、データ伝
送開始処理を受け入れられる状態に戻す。従って、再び
データ伝送開始処理の交信が行なわれ、データ伝送が可
能となる、つまり、自動的にオンライン状態に復旧させ
ることができる。In this way, a carrier wave is always output on line 1 when data transmission is performed normally. The protocol control unit 3 is now in a state where it has completed communication for data transmission start processing with the opposing modem device. In this state, if the carrier wave is disconnected due to a line abnormality or a power failure of the opposing modem, and then the carrier wave is received again, the opposing modem attempts to communicate with the protocol control unit 3 for data transmission start processing. , the protocol control unit 3 has completed the data transmission start process and cannot accept it. Therefore, when the carrier wave is disconnected, the modulation/demodulation monitoring unit 4 detects the disconnection of the carrier wave, and notifies the protocol control unit 3 of the disconnection. Upon receiving this notification, the protocol control unit 3 initializes the protocol, that is, cancels the state in which data transmission is possible after the data transmission start processing has been completed, and returns to the state in which data transmission start processing can be accepted. Therefore, communication for data transmission start processing is performed again, and data transmission becomes possible, that is, it is possible to automatically restore the online state.
以上説明したように本発明は、通信の中断を検出したと
き次に通信を再開するのに必要なプロトコルの初期化を
行うので、通信が中断した場合でも自動的にデータ通信
状態に復旧させるという効果を有する。As explained above, the present invention initializes the protocol necessary to restart communication when a communication interruption is detected, so that even if communication is interrupted, the data communication state is automatically restored. have an effect.
第１図は本発明の一実施例を示す構成図である。
１・・・回線、２・・・変復調部、３・・・プロトコル
制御部、４・・・変復調監視部、５・・・端末。FIG. 1 is a block diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Line, 2... Modulation/demodulation section, 3... Protocol control section, 4... Modulation/demodulation monitoring section, 5... Terminal.
Claims (2)
情報や伝送情報によりデータ伝送の制御手順の処理を行
うプロトコル制御部と、変復調部を監視し通信が途絶え
たときに前記制御手順の初期化を前記プロトコル制御部
へ通知する変復調監視部とを有することを特徴とするデ
ータ変復調装置。(1) A modem unit that modulates and demodulates transmission data, a protocol control unit that processes data transmission control procedures based on error control information and transmission information, and a protocol control unit that monitors the modem units and performs initialization of the control procedures when communication is interrupted. A data modulation/demodulation device comprising: a modulation/demodulation monitoring unit that notifies the protocol control unit of the change in the protocol control unit.
し前記制御手順の初期化を行うことを特徴とする請求項
（１）記載のデータ変復調装置。(2) The data modulation/demodulation device according to claim (1), wherein the modulation/demodulation section detects disconnection of a carrier wave received from a line and initializes the control procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1236195A JPH0398359A (en) | 1989-09-11 | 1989-09-11 | Data modulator-demodulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1236195A JPH0398359A (en) | 1989-09-11 | 1989-09-11 | Data modulator-demodulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0398359A true JPH0398359A (en) | 1991-04-23 |
Family
ID=16997187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1236195A Pending JPH0398359A (en) | 1989-09-11 | 1989-09-11 | Data modulator-demodulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0398359A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5983362A (en) * | 1994-05-24 | 1999-11-09 | Fujitsu Limited | Non-interrupted operation control apparatus for a modulator-demodulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828452B2 (en) * | 1975-12-12 | 1983-06-16 | アケボノブレ−キコウギヨウ カブシキガイシヤ | Rotor configuration Spring disc brake |
| JPS62261254A (en) * | 1986-05-08 | 1987-11-13 | Yagi Antenna Co Ltd | Resetting circuit for catv terminal converter |
-
1989
- 1989-09-11 JP JP1236195A patent/JPH0398359A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828452B2 (en) * | 1975-12-12 | 1983-06-16 | アケボノブレ−キコウギヨウ カブシキガイシヤ | Rotor configuration Spring disc brake |
| JPS62261254A (en) * | 1986-05-08 | 1987-11-13 | Yagi Antenna Co Ltd | Resetting circuit for catv terminal converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5983362A (en) * | 1994-05-24 | 1999-11-09 | Fujitsu Limited | Non-interrupted operation control apparatus for a modulator-demodulator |
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