JPH02260752A - Modulator/demodulator - Google Patents

Modulator/demodulator

Info

Publication number
JPH02260752A
JPH02260752A JP7977389A JP7977389A JPH02260752A JP H02260752 A JPH02260752 A JP H02260752A JP 7977389 A JP7977389 A JP 7977389A JP 7977389 A JP7977389 A JP 7977389A JP H02260752 A JPH02260752 A JP H02260752A
Authority
JP
Japan
Prior art keywords
tone
modulation
section
demodulation
line
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
Application number
JP7977389A
Other languages
Japanese (ja)
Inventor
Shigeyuki Mitani
三谷　繁之
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP7977389A priority Critical patent/JPH02260752A/en
Publication of JPH02260752A publication Critical patent/JPH02260752A/en
Pending legal-status Critical Current

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  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To immediately switch a modulation/demodulation (MODEM) part to an exclusive line when the exclusive line is restored by controlling a network control part and a connecting means to connect the MODEM part to the exclusive line when the detecting result of a PB tone detecting part satisfies a prescribed condition. CONSTITUTION:The MODEM is provided with the PB tone detecting part 8 for detecting the level and contents of a PB tone and a relay 5 for connecting the detecting part 8 or a PB tone sending part 9 to a relay 6. The control part 4 is provided with also a function for controlling the network control part 7 and the relay 6 to connect the modulation/demodulation (MODEM) part 2 to the exclusive line when the detecting result of the detecting part 8 satisfies the prescribed condition. Thereby, whether the exclusive line is normal or not is decided based upon the PB tone detecting result sent through the exclusive line, and when the exclusive line is restored, the MODEM can be automatically and immediately switched to the exclusive line.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、専用回線と加入電話回線とを切り替えてデー
タ通信を行う変復調装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a modem and modulator that performs data communication by switching between a dedicated line and a subscriber telephone line.

〔従来の技術〕[Conventional technology]

第２図に従来のこの種の変復調装置の一例を示す。この
変復調装置１０は、ＤＴＥ　（Ｄａｔａ　Ｔｅｒｍｉｎ
ａｌＥｑｕｉｐＩＩＩｅｎｔ）などに接続された変復調
部ＩＩと、この変復調部１１を加入電話回線に接続する
網制御部１５と、この網制御部１５を通じてＰＢトーン
を加入電話回線に送出するＰＢトーン送出部１６と、変
復調部１１を専用回線に接続するリレー１４と、データ
通信に異常が発生したとき、網制御部１５とリレー１４
を制御して変復調部１１と加入電話回線とを接続する制
御部１３と、この制御部１３に、接続する回線の条件を
与えるスイッチ１２とを備えている。FIG. 2 shows an example of a conventional modem of this type. This modem 10 is a DTE (Data Terminal).
a modulation/demodulation unit II connected to the network (alEquipIIIent), a network control unit 15 that connects the modulation/demodulation unit 11 to the subscriber telephone line, and a PB tone sending unit 16 that sends PB tones to the subscriber telephone line through the network control unit 15. , a relay 14 that connects the modulation/demodulation unit 11 to the dedicated line, and a network control unit 15 and the relay 14 when an abnormality occurs in data communication.
The control section 13 controls the modulation/demodulation section 11 and connects the subscriber telephone line, and the switch 12 provides the control section 13 with conditions for the line to be connected.

そして、発信側および着信側ともに通常は専用回線を通
じてデータ通信を行うが、専用回線の回線品質が瞬断な
どにより劣化し、データ通信に支障が生じた場合には、
制御部１３は、ダイヤルバックアップとして、回線を加
入電話回線側に切り替え、データ通信の継続を可能とす
る。Both the calling and receiving sides normally perform data communication through a dedicated line, but if the line quality of the dedicated line deteriorates due to momentary interruptions and data communication is disrupted,
As a dial backup, the control unit 13 switches the line to the subscriber telephone line side and allows data communication to continue.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかし専用回線に復帰させる場合には、専用回線の状態
を観測する手段がないので、操作者が手動で専用回線側
に切り替えてみて正しぐデータ通信が行えるようなら専
用回線に復帰させ、そうでないならもとの加入電話回線
側に戻すといった操作を行う必要がある。従って、専用
回線への復帰に手間がかかり、専用回線が復旧したとき
直ちに専用回線に切り替えることは実際上不可能である
ので、加入電話回線の回線使用料がかさむ、といった欠
点がある。However, when returning to a dedicated line, there is no way to monitor the state of the dedicated line, so the operator can manually switch to the dedicated line and if data communication can be performed correctly, then return to the dedicated line. If not, you will need to perform operations such as returning to the original subscriber telephone line. Therefore, it takes time and effort to return to the dedicated line, and it is practically impossible to switch to the dedicated line immediately when the dedicated line is restored, so there are drawbacks such as increased line usage charges for the subscriber telephone line.

本発明の目的は、このような欠点を除去し、自動的に、
しかも専用回線が復旧すると直ちに専用回線に切り替え
ることができる変復調装置を提供することにある。The object of the present invention is to eliminate such drawbacks and automatically
Moreover, it is an object of the present invention to provide a modulation/demodulation device that can switch to a dedicated line immediately after the dedicated line is restored.

〔課題を解決するための手段〕[Means to solve the problem]

本発明は、端末装置に接続される変復調部と、この変復
調部を加入電話回線に接続する網制御部と、この網制御
部を通じてＰＢトーンを前記加入電話回線に送出するＰ
Ｂトーン送出部と、前記変復調部を専用回線に接続する
接続手段と、データ通信に異常が発生したとき、前記網
制御部と前記接続手段とを制御して前記変復調部と前記
加入電話回線とを接続する制御部とを備えた変復調装置
において、 ＰＢトーンのレベルと内容を検出するＰＢ　トーン検出
部と、 前記専用回線に前記ＰＢトーン検出部または前記ＰＢト
ーン送出部を接続する切替手段と、前記ＰＢトーン検出
部の検出結果が所定の条件を満たすとき、前記網制御部
および前記接続手段を制御して前記変復調部と前記専用
回線とを接続する制御手段とを備えたことを特徴とする
。The present invention provides a modulation/demodulation section connected to a terminal device, a network control section for connecting the modulation/demodulation section to a subscriber telephone line, and a PB tone for sending a PB tone to the subscriber telephone line through the network control section.
a B tone transmitter, a connection means for connecting the modulation/demodulation section to the leased line, and, when an abnormality occurs in data communication, controlling the network control section and the connection means to connect the modulation/demodulation section to the subscriber telephone line; A modulation/demodulation device comprising: a PB tone detection unit that detects the level and content of a PB tone; a switching unit that connects the PB tone detection unit or the PB tone transmission unit to the dedicated line; The present invention is characterized by comprising a control means for controlling the network control section and the connection means to connect the modulation/demodulation section and the dedicated line when the detection result of the PB tone detection section satisfies a predetermined condition. .

〔実施例〕〔Example〕

次に本発明の実施例について図面を参照して説明する。 Next, embodiments of the present invention will be described with reference to the drawings.

第１図は本発明による変復調装置の一実施例を示すブロ
ック図である。この変復調装置１は、ＤＴＥなどに接続
された変復調部２と、この変復調部２を加入電話回線に
接続する網制御部７と、この網制御部７を通じてＰＢト
ーンを加入電話回線に送出するＰＢトーン送出部９と、
変復調部２を専用回線に接続し、あるいは後述するリレ
ー５の共通接点を専用回線に接続するリレー６と、デー
タ通信に異常が発生したとき、網制御部７とリレー６と
を制御して変復調部２と加入電話回線とを接続する制御
部４と、この制御部４に、接続する回線の条件を与える
スイッチ３とを備え、さらに、ＰＢトーンのレベルと内
容を検出するＰＢトーン検出部８と、リレー６にＰＢト
ーン検出部８またはＰＢトーン送出部９を接続するリレ
ー５とを備えている。そして、制御部４は上述した機能
の他に、ＰＢトーン検出部８の検出結果が所定の条件を
満たすとき、網制御部７およびリレー６を制御して変復
調部２と専用回線とを接続する機能をも備えている。FIG. 1 is a block diagram showing an embodiment of a modulation/demodulation device according to the present invention. This modulation/demodulation device 1 includes a modulation/demodulation section 2 connected to a DTE or the like, a network control section 7 that connects the modulation/demodulation section 2 to a subscriber telephone line, and a PB tone transmitter that sends PB tones to the subscriber telephone line through the network control section 7. a tone sending section 9;
When an abnormality occurs in data communication with a relay 6 that connects the modulation/demodulation unit 2 to a dedicated line or connects a common contact of a relay 5 (described later) to the dedicated line, the network control unit 7 and the relay 6 are controlled to perform modulation/demodulation. A PB tone detection section 8 includes a control section 4 for connecting the section 2 and the subscriber telephone line, and a switch 3 for giving conditions for the line to be connected to the control section 4. and a relay 5 that connects the relay 6 to a PB tone detection section 8 or a PB tone transmission section 9. In addition to the above-mentioned functions, the control section 4 controls the network control section 7 and the relay 6 to connect the modulation/demodulation section 2 and the dedicated line when the detection result of the PB tone detection section 8 satisfies a predetermined condition. It also has functions.

次に動作を説明する。ダイヤルバックアップの動作は従
来の変復調装置の場合と同様であり、専用回線の回線品
質が瞬断などにより劣化し、データ通信に支障が生じた
場合には、制御部４は回線を加入電話回線側に切り替え
、データ通信の継続を可能とする。この状態から専用回
線に復帰するための動作を以下に説明する。Next, the operation will be explained. The operation of dial backup is similar to that of conventional modems, and if the line quality of the dedicated line deteriorates due to a momentary interruption or the like and a problem occurs in data communication, the control unit 4 transfers the line to the subscriber telephone line side. switch to enable continuation of data communication. The operation for returning from this state to a dedicated line will be described below.

変復調装置１が発信側として動作する場合には、制御部
４はまずリレー６を制御してＰＢトーン送出部９を専用
回線に接続する。そしてＰＢトーン送出部９を制御して
符号化されたＰＢトーンを一定時間送出させる。その後
、リレー５を制御しＰＢトーン検出部８を専用回線に接
続する。ＰＢトーン検出部８は着信側の変復調装置から
送られてきた符号化されたＰＢトーンのレベルと内容と
を検出し、結果を制御部４に出力する。制御部４はＰＢ
トーン検出部８の検出結果にもとづいて専用回線を通じ
て正常にデータ通信を行えるか否かを判断し、正常にデ
ータ通信を行えると判断した場合にはリレー６を制御し
て変復調部２を専用回線に接続し、網制御部７を制御し
て加入電話回線を解放する。以降、専用回線を通じてデ
ータ通信が行われる。また、正常にデータ通信を行えな
いと判断した場合には、制御部４は変復調部２を専用回
線に接続せず、引き続き一定の周期で上述した専用回線
監視の手順を繰り返す。When the modem 1 operates as a transmitter, the controller 4 first controls the relay 6 to connect the PB tone transmitter 9 to the dedicated line. Then, the PB tone sending unit 9 is controlled to send out the encoded PB tone for a certain period of time. Thereafter, the relay 5 is controlled to connect the PB tone detector 8 to the dedicated line. The PB tone detection section 8 detects the level and content of the encoded PB tone sent from the receiving side modulation/demodulation device, and outputs the result to the control section 4. The control unit 4 is PB
Based on the detection result of the tone detection unit 8, it is determined whether data communication can be performed normally through the dedicated line, and if it is determined that data communication can be performed normally, the relay 6 is controlled to connect the modem unit 2 to the dedicated line. , and controls the network control unit 7 to release the subscriber telephone line. Thereafter, data communication is performed through the dedicated line. Further, if it is determined that data communication cannot be performed normally, the control unit 4 does not connect the modulation/demodulation unit 2 to the dedicated line, and continues to repeat the above-described dedicated line monitoring procedure at regular intervals.

一方、変復調装置１が着信側として動作する場合には、
制御部４はリレー５を制御してＰＢ　トーン検出部８を
専用回路に接続する。ＰＢトーン検出部８はこれにより
、発信側の変復調装置から送られてくる符号化されたＰ
Ｂトーンのレベルと内容とを検出し、結果を制御部４に
出力する。制御部４はＰＢトーン検出部８の検出結果に
もとづいて専用回線を通じて正常にデータ通信を行える
か否かを判断し、正常にデータ通信を行えると判断した
場合にはリレー６を制御し、ＰＢトーン送出部９を専用
回線に接続する。そして、制御部４はＰＢＩ−−ン送出
部９を制御して応答用の符号化されたＰＢトーンを送出
させる。その後、リレー６を制御して変復調部２を専用
回線に接続し、専用回線でのデータ通信に復旧させる。On the other hand, when the modem 1 operates as a receiving side,
The control section 4 controls the relay 5 to connect the PB tone detection section 8 to the dedicated circuit. The PB tone detection unit 8 thereby detects the encoded P tone sent from the transmitting modem.
The level and content of the B tone are detected and the results are output to the control section 4. The control unit 4 determines whether data communication can be performed normally through the dedicated line based on the detection result of the PB tone detection unit 8, and if it is determined that data communication can be performed normally, it controls the relay 6 and Connect the tone sending unit 9 to the dedicated line. Then, the control section 4 controls the PBI-tone sending section 9 to send out a coded PB tone for response. Thereafter, the relay 6 is controlled to connect the modulation/demodulation unit 2 to the dedicated line, thereby restoring data communication over the dedicated line.

制御部４はさらに専用回線でのデータ通信を調べ、正常
にデータ通信が行われている場合には、網制御部７を制
御して加入電話回線を解放する。しかし、正常にデータ
通信が行われていないと判断した場合には、制御部４は
加入電話回線によるデータ通信に戻し、引き続き一定の
周期で上述した専用回線監視の手順を繰り返す。The control section 4 further checks the data communication on the dedicated line, and if the data communication is being performed normally, controls the network control section 7 to release the subscriber telephone line. However, if it is determined that the data communication is not being carried out normally, the control unit 4 returns to data communication using the subscriber telephone line, and then repeats the above-described leased line monitoring procedure at regular intervals.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、端末装置に接続される変
復調部と、この変復調部を加入電話回線に接続する網制
御部と、この網制御部を通じてＰＢトーンを加入電話回
線に送出するＰＢトーン送出部と、変復調部を専用回線
に接続する接続手段と、データ通信に異常が発生したと
き、網制御部と接続手段とを制御して変復調部と加入電
話回線とを接続する制御部とを備えた変復調装置におい
て、ＰＢトーンのレベルと内容を検出するＰＢトーン検
出部と、専用回線にＰＢトーン検出部またはＰＢトーン
送出部を接続する切替手段と、ＰＢトーン検出部の検出
結果が所定の条件を満たすとき、網制御部および接続手
段を制御して変復調部と専用回線とを接続する制御手段
とを備えている。As explained above, the present invention provides a modulation/demodulation unit connected to a terminal device, a network control unit that connects this modulation/demodulation unit to a subscriber telephone line, and a PB tone that sends a PB tone to the subscriber telephone line through the network control unit. A transmission section, a connection means for connecting the modulation/demodulation section to the dedicated line, and a control section for controlling the network control section and the connection means to connect the modulation/demodulation section and the subscriber telephone line when an abnormality occurs in data communication. The modulation/demodulation device includes a PB tone detection unit that detects the level and content of the PB tone, a switching unit that connects the PB tone detection unit or the PB tone transmission unit to a dedicated line, and a switch that connects the detection result of the PB tone detection unit to a predetermined level. The control means controls the network control section and the connection means to connect the modulation/demodulation section and the dedicated line when the conditions are satisfied.

従って本発明の変復調装置では、専用回線を通じて送ら
れてくるＰＢトーンの検出結果にもとづいて専用回線が
正常か否かを判断し、自動的に、しかも専用回線が復旧
すると直ちに専用回線に切り替えることができる。Therefore, the modem of the present invention determines whether the dedicated line is normal or not based on the detection result of the PB tone sent through the dedicated line, and automatically switches to the dedicated line as soon as the dedicated line is restored. I can do it.

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

第１図は本発明による変復調装置の一実施例を示すブロ
ック図、 第２図は従来の変復調装置の一例を示すブロック図であ
る。 １・・・変復調装置 ２・・・変復調部 ３・・・スイッチ ４・・・制御部 ５．６・・・リレー ７・・・網制御部 ８・・・ＰＢトーン検出部 ９・・・ＰＢトーン送出部FIG. 1 is a block diagram showing an embodiment of a modulation/demodulation device according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional modulation/demodulation device. 1...Modulation/demodulation device 2...Modulation/demodulation section 3...Switch 4...Control section 5.6...Relay 7...Network control section 8...PB tone detection section 9...PB Tone sending section

Claims (1)

【特許請求の範囲】[Claims] （１）端末装置に接続される変復調部と、この変復調部
を加入電話回線に接続する網制御部と、この網制御部を
通じてＰＢトーンを前記加入電話回線に送出するＰＢト
ーン送出部と、前記変復調部を専用回線に接続する接続
手段と、データ通信に異常が発生したとき、前記網制御
部と前記接続手段とを制御して前記変復調部と前記加入
電話回線とを接続する制御部とを備えた変復調装置にお
いて、 ＰＢトーンのレベルと内容を検出するＰＢトーン検出部
と、 前記専用回線に前記ＰＢトーン検出部または前記ＰＢト
ーン送出部を接続する切替手段と、前記ＰＢトーン検出
部の検出結果が所定の条件を満たすとき、前記網制御部
および前記接続手段を制御して前記変復調部と前記専用
回線とを接続する制御手段とを備えたことを特徴とする
変復調装置。(1) a modulation/demodulation section connected to a terminal device, a network control section that connects this modulation/demodulation section to a subscriber telephone line, a PB tone sending section that sends a PB tone to the subscriber telephone line through the network control section; a connection means for connecting the modulation/demodulation section to a dedicated line; and a control section for controlling the network control section and the connection means to connect the modulation/demodulation section and the subscriber telephone line when an abnormality occurs in data communication. A modulation/demodulation device comprising: a PB tone detection unit that detects the level and content of a PB tone; switching means that connects the PB tone detection unit or the PB tone transmission unit to the dedicated line; and a detection unit for the PB tone detection unit. A modulation/demodulation device comprising: control means that controls the network control section and the connection means to connect the modulation/demodulation section and the dedicated line when a result satisfies a predetermined condition.
JP7977389A 1989-03-30 1989-03-30 Modulator/demodulator Pending JPH02260752A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7977389A JPH02260752A (en) 1989-03-30 1989-03-30 Modulator/demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7977389A JPH02260752A (en) 1989-03-30 1989-03-30 Modulator/demodulator

Publications (1)

Publication Number Publication Date
JPH02260752A true JPH02260752A (en) 1990-10-23

Family

ID=13699525

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7977389A Pending JPH02260752A (en) 1989-03-30 1989-03-30 Modulator/demodulator

Country Status (1)

Country Link
JP (1) JPH02260752A (en)

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