JP2827232B2 - Public communication line connection method - Google Patents
Public communication line connection methodInfo
- Publication number
- JP2827232B2 JP2827232B2 JP63274752A JP27475288A JP2827232B2 JP 2827232 B2 JP2827232 B2 JP 2827232B2 JP 63274752 A JP63274752 A JP 63274752A JP 27475288 A JP27475288 A JP 27475288A JP 2827232 B2 JP2827232 B2 JP 2827232B2
- Authority
- JP
- Japan
- Prior art keywords
- unit
- control unit
- communication line
- public communication
- response signal
- 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 - Lifetime
Links
- 238000004891 communication Methods 0.000 title claims description 63
- 238000000034 method Methods 0.000 title claims description 5
- 238000005259 measurement Methods 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000008054 signal transmission Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、データ通信の公衆通信回線接続方式に利用
する。特に、変復調装置間を電話網を介して接続する場
合の公衆通信回線接続方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used for a public communication line connection system for data communication. In particular, the present invention relates to a public communication line connection system for connecting between modems via a telephone network.
本発明は公衆通信回線接続方式において、 第一の変復調装置と第二の変復調装置とを一度公衆通
信回線で接続し、第一の変復調装置から第二の変復調装
置に所定信号を送出し、第二の変復調装置では受信した
所定信号のレベル測定を行い、S/N値を算出して規定値
以上の場合にデータ通信を許可することにより、 データ通信を常に良い品質で行うことができるように
したものである。The present invention relates to a public communication line connection system, wherein a first modem and a second modem are connected once by a public communication line, and a predetermined signal is transmitted from the first modem to the second modem. The second modem performs level measurement of the received predetermined signal, calculates the S / N value, and permits data communication when the value is equal to or greater than the specified value, so that data communication can always be performed with good quality. It was done.
従来、公衆通信回線接続方式は、伝送品質に対して無
条件で変復調装置間を公衆通信回線で接続する方法がと
られていた。Conventionally, in the public communication line connection method, a method has been adopted in which modulation and demodulation devices are connected via a public communication line unconditionally with respect to transmission quality.
しかし、このような公衆通信回線接続方式では、公衆
通信回線は接続を行うごとに品質が異なるために公衆通
信回線の伝送品質が悪い場合には、変復調装置間でのデ
ータ通信に支障をきたす欠点があった。However, in such a public communication line connection method, since the quality of the public communication line differs each time a connection is made, if the transmission quality of the public communication line is poor, data communication between the modems will be hindered. was there.
本発明は上記の欠点を解決するもので、データ通信を
常に良い品質で行うことができる公衆通信回線接続方式
を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide a public communication line connection system capable of always performing data communication with good quality.
本発明は、第一の変復調装置と、この第一の変復調装
置に公衆通信回線を介して接続される第二の変復調装置
とを備え、上記二つの変復調装置はそれぞれ、信号の変
復調部と、公衆通信回線に対する接続制御を行う網制御
部とを含む公衆通信回線接続方式において、上記第一の
変復調装置は、所定信号を出力するトーン送信部と、相
手先の応答信号を受信する応答信号受信部と、自網制御
部を自変復調部または上記トーン送信部および上記応答
信号受信部に接続する第一のセレクタと、上記応答信号
に基づき自網制御部、上記トーン送信部および上記第一
のセレクタを制御する第一の制御部を含み、上記第二の
変復調装置は、上記所定信号のレベルを測定するレベル
測定部と相手先に応答信号を出力する応答信号送信部
と、自網制御部を自変復調部または上記レベル測定部お
よび上記応答信号送信部に接続する第二のセレクタと、
上記レベル測定部の測定結果に基づきS/N値を算出し規
定値との比較結果により上記応答信号送信部、自網制御
部および第二のセレクタを制御する第二の制御部とを含
み、上記第一の制御部は、上記公衆通信回線の接続後に
上記トーン送信部から所定信号を上記公衆通信回線に送
信させる手段を含み、上記第二の制御部は、上記公衆通
信回線からの上記所定信号にかかるS/N値を測定してあ
らかじめ設定された規定値以上であるときに応答を送信
し通信状態に入る制御手段を含み、さらに上記第一の制
御部は、この応答を受信して通信状態に入る制御手段を
含むことを特徴とする。The present invention includes a first modem, a second modem connected to the first modem via a public communication line, the two modems, respectively, a signal modem, In a public communication line connection system including a network control unit that controls connection to a public communication line, the first modem includes a tone transmission unit that outputs a predetermined signal, and a response signal reception unit that receives a response signal of the other party. And a first selector connecting the own network control unit to the self-modulating / demodulating unit or the tone transmitting unit and the response signal receiving unit; and a own network control unit based on the response signal, the tone transmitting unit and the first A second control unit for controlling a selector, the second modem includes a level measuring unit for measuring a level of the predetermined signal, a response signal transmitting unit for outputting a response signal to a destination, and a local network control unit. Self-changing A second selector for connecting the regulating unit or the level measurement unit and the response signal transmission unit,
The response signal transmitting unit, based on the result of comparison with the specified value to calculate the S / N value based on the measurement result of the level measuring unit, including a second control unit that controls the own network control unit and the second selector, The first control unit includes means for transmitting a predetermined signal from the tone transmitting unit to the public communication line after the connection of the public communication line, and the second control unit includes a unit for transmitting the predetermined signal from the public communication line. Includes control means that measures the S / N value of the signal and sends a response when the signal is equal to or greater than a predetermined value and enters a communication state, and further the first control unit receives the response It is characterized by including control means for entering a communication state.
第一のセレクタは第一の制御部の制御により自装置の
網制御部をトーン送信部および応答信号受信部と接続さ
せる。第二のセレクタは第二の制御部の制御により自装
置の網制御部をレベル測定部および応答信号送信部と接
続させる。各網制御部はそれぞれの制御部の制御により
公衆通信回線と接続する。応答信号送信部は第二の制御
部の制御により自装置の網制御部と公衆通信回線とが接
続されたことを示す信号を第一の変復調装置に送出す
る。応答信号受信部はこの接続されたことを示す信号を
受信し第一制御部に通知する。トーン送信部は第一制御
部の制御により所定信号を第二の変復調送出に送出す
る。レベル測定部は所定の信号のレベルを測定しあらか
じめ設定された規定値と比較する。算出したS/N値が規
定値以上の場合には、第二の制御部の制御により応答信
号送信部は規定値以上であることを示す信号を第二の変
復調装置に通知し、第二のセレクタは網制御部を自変復
調部と接続する。算出したS/N値が規定値未満のときに
は第二の制御部の制御により自網制御部は公衆通信回線
をオンフックする。第一の変復調装置では算出したS/N
値が規定値以上であることを示す信号を応答信号受信部
か受信した場合には、第二の制御部の制御により第一の
セレクタは網制御部を自変復調部と接続する。規定値以
上であることを示す信号がないときには第一の制御部の
制御により自網制御部は公衆通信回線をオンフックす
る。以上の動作によりデータ通信を常に良い品質で行う
ことができる。The first selector connects the network control unit of the own device to the tone transmitting unit and the response signal receiving unit under the control of the first control unit. The second selector connects the network control unit of the own device to the level measurement unit and the response signal transmission unit under the control of the second control unit. Each network control unit is connected to a public communication line under the control of each control unit. The response signal transmitting unit transmits a signal indicating that the network control unit of the own device and the public communication line are connected to the first modem under the control of the second control unit. The response signal receiving unit receives the signal indicating the connection and notifies the first control unit. The tone transmitting section transmits a predetermined signal to the second modulation / demodulation transmission under the control of the first control section. The level measuring section measures the level of a predetermined signal and compares it with a preset specified value. If the calculated S / N value is equal to or more than the specified value, the response signal transmitting unit controls the second control unit to notify the second modem of a signal indicating that the value is equal to or more than the specified value, and the second The selector connects the network control unit to the self-modulating demodulation unit. When the calculated S / N value is less than the specified value, the own network control unit hooks up the public communication line under the control of the second control unit. S / N calculated by the first modem
When the response signal receiving unit receives a signal indicating that the value is equal to or greater than the specified value, the first selector connects the network control unit to the autonomous demodulation unit under the control of the second control unit. When there is no signal indicating that the value is equal to or more than the prescribed value, the own network control unit hooks the public communication line under the control of the first control unit. With the above operation, data communication can always be performed with good quality.
本発明の実施例について図面を参照して説明する。第
１図は本発明一実施例公衆通信回線接続装置のブロック
構成図である。第１図いおいて、公衆通信回線接続装置
は、第一の変復調装置として変復調装置１と、変復調装
置に公衆通信回線４、５および電話網３を介して接続さ
れる第二の変復調装置として変復調装置２とを備え、変
復調装置１、２はそれぞれ、信号の変復調部10、11と、
公衆通信回線４、５に対する接続制御を行う網制御部
６、７とを含む。Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a public communication line connecting apparatus according to an embodiment of the present invention. In FIG. 1, a public communication line connecting device is a modem device 1 as a first modem device and a second modem device connected to the modem device via the public communication lines 4 and 5 and the telephone network 3. And a modulation / demodulation device 2. The modulation / demodulation devices 1 and 2 respectively include signal modulation / demodulation units 10 and 11,
Network control units 6 and 7 for controlling connection to public communication lines 4 and 5 are included.
ここで本発明の特徴とするところは、変復調装置１
は、公衆通信回線４、５および電話網３のS/N値を測定
するための所定信号を出力するトーン送信部12と、相手
先の応答信号を受信する応答信号受信部13と、網制御部
６を変復調部10またはトーン送信部12および応答信号受
信部13に接続するセレクタ８と、上記応答信号に基づき
網制御部６、トーン送信部12およびセレクタ８を制御す
る制御部16を含み、変復調装置２は、所定信号のレベル
を測定するレベル測定部15と相手先に応答信号を出力す
る応答信号送信部14と、網制御部７を変復調部11または
レベル測定部15および応答信号送信部14に接続するセレ
クタ９と、レベル測定部15の測定結果に基づきS/N値を
算出し規定値との比較結果により応答信号送信部14、網
制御部７およびセレクタ９を制御する第二の制御部とし
て制御部17と、制御部17に規定値を設定する設定部18と
を含み、制御部16は、公衆通信回線４、５の接続後にト
ーン送信部12から所定信号を公衆通信回線４に送信させ
る手段を含み、制御部17は、公衆通信回線５からの所定
信号にかかるS/N値を測定してあらかじめ設定された規
定値以上であるときに応答を送信し通信状態に入る制御
手段を含み、さらに制御部16は、この応答を受信して通
信状態に入る制御手段を含むことにある。The feature of the present invention is that the modem 1
A tone transmitting unit 12 for outputting a predetermined signal for measuring the S / N value of the public communication lines 4, 5 and the telephone network 3, a response signal receiving unit 13 for receiving a response signal of the other party, A selector 8 for connecting the unit 6 to the modulation / demodulation unit 10 or the tone transmission unit 12 and the response signal reception unit 13; and a control unit 16 for controlling the network control unit 6, the tone transmission unit 12 and the selector 8 based on the response signal. The modulation / demodulation device 2 includes a level measurement unit 15 for measuring a level of a predetermined signal, a response signal transmission unit 14 for outputting a response signal to a destination, and a network control unit 7 including the modulation / demodulation unit 11 or the level measurement unit 15 and the response signal transmission unit. And a second selector for controlling the response signal transmitting unit, the network control unit, and the selector based on a result of calculation of an S / N value based on a measurement result of the level measurement unit and a specified value. Control unit 17 as control unit, and specified value for control unit 17 A setting unit 18 for setting, the control unit 16 includes means for transmitting a predetermined signal from the tone transmitting unit 12 to the public communication line 4 after connection of the public communication lines 4 and 5, and the control unit 17 includes: 5 includes a control means for measuring the S / N value of the predetermined signal from No. 5 and transmitting a response when the S / N value is equal to or greater than a predetermined value and entering a communication state. Further, the control unit 16 receives the response. And a control means for entering a communication state.
このような構成の公衆通信回線接続装置の動作につい
て説明する。第２図は本発明の公衆通信回線接続装置の
制御部の処理を示すフローチャートである。The operation of the public communication line connecting device having such a configuration will be described. FIG. 2 is a flowchart showing the processing of the control unit of the public communication line connection device of the present invention.
第１図および第２図において、変復調装置１の制御部
16は、セレクタ８を動作させトーン送信部12および応答
信号受信部13と網制御部６とを接続させる（S11）。変
復調装置２の制御部17は、セレクタ９を動作させレベル
測定部15および応答信号送信部14と網制御部７とを接続
させる（S21）。変復調装置１の制御部16は、網制御部
６を動作させ、変復調装置２の制御部17は、網制御部７
を動作させ、網制御部６と網制御部７とを公衆通信回線
４、電話網３および公衆通信回線５を介して接続する
（S12、S22）。1 and 2, the control unit of the modem 1
16 operates the selector 8 to connect the tone transmitting unit 12 and the response signal receiving unit 13 to the network control unit 6 (S11). The control unit 17 of the modem 2 operates the selector 9 to connect the level measurement unit 15, the response signal transmission unit 14, and the network control unit 7 (S21). The controller 16 of the modem 1 operates the network controller 6, and the controller 17 of the modem 2 operates the network controller 7.
To connect the network control unit 6 and the network control unit 7 via the public communication line 4, the telephone network 3 and the public communication line 5 (S12, S22).
変復調装置２では、制御部17は公衆通信回線が接続さ
れたことを示す信号を応答信号送信部14より変復調装置
１に対して送出させる（S23）。変復調装置１の応答信
号受信部13が、この信号を受信したときに制御部16はト
ーン送信部12より所定信号を変復調装置２に対して送出
する（S13、S14）。変復調装置２では、所定信号のレベ
ルをレベル測定部15で測定し、制御部17は、レベル測定
結果より信号対雑音比の値（S/N値）を算出する。制御
部17は、設定部18により設定された公衆通信回線品質の
規定値と算出したS/N値との比較を行う（S24）。In the modem 2, the controller 17 causes the response signal transmitter 14 to transmit a signal indicating that the public communication line is connected to the modem 1 (S23). When the response signal receiving section 13 of the modem 1 receives this signal, the control section 16 sends a predetermined signal from the tone transmitting section 12 to the modem 2 (S13, S14). In the modem 2, the level of the predetermined signal is measured by the level measuring section 15, and the control section 17 calculates a signal-to-noise ratio value (S / N value) from the level measurement result. The control unit 17 compares the specified value of the public communication line quality set by the setting unit 18 with the calculated S / N value (S24).
算出したS/N値が規定値以上である場合には制御部17
は、応答信号送出部14より公衆通信回線の品質が設定部
18に設定された規定値以上であったことを示す信号を送
出させ（S26）、セレクタ９を動作させ公衆通信回線５
を変復調部11と接続させる（S27）。If the calculated S / N value is equal to or more than the specified value, the control unit 17
The response signal sending unit 14 sets the quality of the public communication line to the setting unit.
A signal indicating that the value is equal to or greater than the specified value set in 18 is transmitted (S26), and the selector 9 is operated to operate the public communication line 5.
Is connected to the modem unit 11 (S27).
変復調装置１の応答信号受信部13がこの信号を受信し
たときに、制御部16は、セレクタ８を動作させ公衆通信
回線４を変復調部10を接続させる（S16）。When the response signal receiving section 13 of the modem 1 receives this signal, the controller 16 operates the selector 8 to connect the public communication line 4 to the modem 10 (S16).
算出したS/N値が規定値以上でない場合には、制御部1
7は、網制御部７を制御し、公衆通信回線５をオンフッ
クさせる（S28）。変復調装置１の応答信号受信部13は
変復調装置２からの応答信号を受信しないために制御部
16は、網制御部６を動作させ公衆通信回線４とオンフッ
クさせる（S17）。If the calculated S / N value is not more than the specified value, the control unit 1
7 controls the network control unit 7 to make the public communication line 5 on-hook (S28). The response signal receiving unit 13 of the modulation and demodulation device 1 has a control unit for not receiving the response signal from the modulation and demodulation device 2.
In step S17, the network control unit 6 is operated to hook on the public communication line 4.
以上により変復調装置１と変復調装置２との間をS/N
値が規定値以上の品質に限り接続することができる。As described above, the S / N between the modem 1 and the modem 2 is
Connection can be made only when the quality is equal to or higher than the specified value.
以上説明したように、本発明は、変復調装置間でのデ
ータ通信を常にあらかじめ定めたレベル以上の良い品質
で行うことができる優れた効果がある。As described above, the present invention has an excellent effect that data communication between modems can always be performed at a quality higher than a predetermined level.
第１図は本発明一実施例公衆通信回線接続装置のブロッ
ク構成図。 第２図は本発明の公衆通信回線接続装置の制御部の処理
を示すフローチャート。 １、２……変復調装置、３……電話網、４、５……公衆
通信回線、６、７……網制御部、８、９……セレクタ、
10、11……変復調部、12……トーン送信部、13……応答
信号受信部、14……応答信号送信部、15……レベル測定
部、16、17……制御部、18……設定部。FIG. 1 is a block diagram of a public communication line connection device according to an embodiment of the present invention. FIG. 2 is a flowchart showing the processing of the control unit of the public communication line connection device of the present invention. 1, 2,... Modulation / demodulation device, 3,... Telephone network, 4, 5, ... public communication line, 6, 7, ... network control unit, 8, 9,.
10, 11: Modulation / demodulation unit, 12: Tone transmission unit, 13: Response signal reception unit, 14: Response signal transmission unit, 15: Level measurement unit, 16, 17: Control unit, 18: Setting Department.
Claims (1)
置に公衆通信回線を介して接続される第二の変復調装置
とを備え、 上記二つの変復調装置はそれぞれ、信号の変復調部と、
公衆通信回線に対する接続制御を行う網制御部とを含む 公衆通信回線接続方式において、 上記第一の変復調装置は、所定信号を出力するトーン送
信部と、相手先の応答信号を受信する応答信号受信部
と、自網制御部を自変復調部または上記トーン送信部お
よび上記応答信号受信部に接続する第一のセレクタと、
上記応答信号に基づき自網制御部、上記トーン送信部お
よび上記第一のセレクタを制御する第一の制御部を含
み、 上記第二の変復調装置は、上記所定信号のレベルを測定
するレベル測定部と相手先に応答信号を出力する応答信
号送信部と、自網制御部を自変復調部または上記レベル
測定部および上記応答信号送信部に接続する第二のセレ
クタと、上記レベル測定部の測定結果に基づき上記所定
信号にかかるS/N値を算出し規定値との比較結果により
上記応答信号送信部、自網制御部および第二のセレクタ
を制御する第二の制御部とを含み、 上記第一の制御部は、上記公衆通信回線の接続後に上記
トーン送信部から所定信号を上記公衆通信回線に送信さ
せる手段を含み、 上記第二の制御部は、上記公衆通信回線からの上記所定
信号にかかるS/N値を測定してあらかじめ設定された規
定値以上であるときに応答を送信し通信状態に入り、規
定値未満のときは上記公衆通信回線をオンフックさせる
制御手段を含み、 さらに上記第一の制御部は、この応答を受信して通信状
態に入る制御手段を含む ことを特徴とする公衆通信回線接続方式。A first modulation / demodulation device; and a second modulation / demodulation device connected to the first modulation / demodulation device via a public communication line. The two modulation / demodulation devices each include a signal modulation / demodulation unit and a signal modulation / demodulation unit. ,
In a public communication line connection system including a network control unit that controls connection to a public communication line, the first modem includes a tone transmission unit that outputs a predetermined signal, and a response signal reception that receives a response signal of the other party. And a first selector connecting the own network control unit to the self-modulating demodulation unit or the tone transmitting unit and the response signal receiving unit,
A first control unit that controls the own network control unit, the tone transmission unit, and the first selector based on the response signal, wherein the second modulation / demodulation device measures a level of the predetermined signal. And a response signal transmitting unit that outputs a response signal to the other party, a second selector that connects the own network control unit to the self-modulating / demodulating unit or the level measuring unit and the response signal transmitting unit, and a measurement result of the level measuring unit. The S / N value of the predetermined signal is calculated based on the response signal transmission unit according to a comparison result with a specified value, including a second control unit that controls the own network control unit and a second selector, One control unit includes means for transmitting a predetermined signal from the tone transmission unit to the public communication line after the connection of the public communication line, and the second control unit transmits the predetermined signal from the public communication line to the predetermined signal. Such S / N value The control unit transmits a response when the measured value is equal to or greater than a predetermined value and enters a communication state, and includes a control unit that causes the public communication line to go on-hook when the value is less than the specified value, and further includes the first control unit, A public communication line connection method including control means for receiving the response and entering a communication state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63274752A JP2827232B2 (en) | 1988-10-31 | 1988-10-31 | Public communication line connection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63274752A JP2827232B2 (en) | 1988-10-31 | 1988-10-31 | Public communication line connection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02121459A JPH02121459A (en) | 1990-05-09 |
| JP2827232B2 true JP2827232B2 (en) | 1998-11-25 |
Family
ID=17546093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63274752A Expired - Lifetime JP2827232B2 (en) | 1988-10-31 | 1988-10-31 | Public communication line connection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2827232B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06105936B2 (en) * | 1986-12-01 | 1994-12-21 | 株式会社日立ビルシステムサービス | Data communication device |
-
1988
- 1988-10-31 JP JP63274752A patent/JP2827232B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02121459A (en) | 1990-05-09 |
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