JPH03220852A - Modulator-demodulator - Google Patents
Modulator-demodulatorInfo
- Publication number
- JPH03220852A JPH03220852A JP1681590A JP1681590A JPH03220852A JP H03220852 A JPH03220852 A JP H03220852A JP 1681590 A JP1681590 A JP 1681590A JP 1681590 A JP1681590 A JP 1681590A JP H03220852 A JPH03220852 A JP H03220852A
- Authority
- JP
- Japan
- Prior art keywords
- line
- switching
- isdn
- signal
- instruction 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は専用回線に用いる変復調装置に利用され、特に
、ＩＳＤＮバツクアツプ付の変復調装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a modulation/demodulation device used in a dedicated line, and particularly relates to a modulation/demodulation device with ISDN backup.
本発明は、専用回線を介して通信を行う手段を備えた変
ｔｉ調装置において、
専用回線が障害のときに、専用回線をＩＳＤＮ回線に切
り換える手段を備えることにより、公衆１話回ａ１回線
でもって回線切換えができかつ、回線品質を向上できる
ようにしたもので庶る。The present invention provides a variable ti tuning device equipped with a means for communicating via a dedicated line, which is equipped with a means for switching the dedicated line to an ISDN line when the dedicated line is in trouble, so that it can be used over a public 1-channel A1 line. This makes it possible to switch lines and improve line quality.
〔従来の技術二
従来、対向している２台の変復調装置が専用直線を介し
て通信を行っている構成において、専用回線に障害が生
じた場合には、通信回線を公衆１話回線に切り換え復旧
後専用回線に戻していた。[Conventional technology 2] Conventionally, in a configuration in which two opposing modems communicate via a dedicated straight line, if a failure occurs in the dedicated line, the communication line is switched to a public single-talk line. After restoration, the line was reverted to a dedicated line.
〔発明が解決しようとする問題点３
以上述べた従来の変復調装置によれば、専用回線に障害
が生じ通信回線を公衆電話回線に切り挟えるには、専用
回線が４線から構成されているのに対して公衆電話回線
は２線式であるため、公衆電話回線が２回線必要であり
、さらに回線品質か低下する欠点がある。[Problem to be Solved by the Invention 3] According to the conventional modem device described above, in order to cut the communication line to a public telephone line in the event of a fault in the dedicated line, the dedicated line must consist of four wires. On the other hand, public telephone lines are two-wire systems, so two public telephone lines are required, and there is also the disadvantage that the line quality deteriorates.
本発明の目的は、前記の欠点を除去することにより、公
衆電話回線１回線でもって回線切換えが可能で、かつ回
線品質を向上できるＩＳＤＮバツクアツプ付の変復調装
置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a modulation/demodulation device with ISDN backup that can perform line switching using a single public telephone line and improve line quality by eliminating the above-mentioned drawbacks.
本発明は、送信データを変調した送信信号を専用回線に
送出し、前記専用回線からの受信信号を復調し受信デー
タを再生する変復調手段を備えた変復調装置において、
前記変復調装置はＩＳＤＮ回線に接続され、前記送信信
号を符号化し前記ＩＳＤＮ回線に送出し、前記ＩＳＤＮ
回線から受信されたディジタル信号を復号化する符号化
復号化手段と、前記変復調手段の一端を、前記専用回線
から前記ＩＳＤＮ回線に切り換え接続する第一の切換信
号または前記ＩＳＤＮ回線から前記専用回線に切り戻し
接続する第二の切換信号により切り換えまたは切り戻し
を行う切換手段と、前記専用回線が障害になったとき、
第一または第二の切換指示信号により前記第一または第
二の切換信号を出力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 device comprising modulation/demodulation means for transmitting a transmission signal obtained by modulating transmission data to a dedicated line, demodulating a received signal from the dedicated line, and reproducing the received data.
The modulation/demodulation device is connected to an ISDN line, encodes the transmission signal, sends it to the ISDN line, and transmits the encoded signal to the ISDN line.
an encoding/decoding means for decoding a digital signal received from a line; and a first switching signal for switching and connecting one end of the modulation/demodulation means from the dedicated line to the ISDN line, or from the ISDN line to the dedicated line. a switching means that performs switching or switching back by a second switching signal for switching back connection, and when the dedicated line becomes a failure;
The present invention is characterized by comprising a control means for outputting the first or second switching signal in response to the first or second switching instruction signal.
また、本発明は、前記第一および第二の切換指示信号を
外部から人力する第一の指示信号入力端子を備えること
ができる。Further, the present invention can include a first instruction signal input terminal for manually inputting the first and second switching instruction signals from the outside.
また、本発明は、前記専用回線の通信状態を監視し障害
を検出したとき前記第一の切換指示信号を出力し、外部
からの指示信号により前記第二の切換指示信号を出力す
る切換指示信号発生手段と、外部からの前記指示信号を
入力する第二の指示信号入力端子とを備えることができ
る。Further, the present invention provides a switching instruction signal that monitors the communication state of the dedicated line and outputs the first switching instruction signal when a failure is detected, and outputs the second switching instruction signal in response to an external instruction signal. The device may include a generating means and a second instruction signal input terminal for inputting the instruction signal from the outside.
専用回線に障害が生じた場合、外部または指示信号発生
手段から第一または第二の切換指示信号が出力され、こ
れにより制御手段は第一または第二の切換信号を出力す
る。そして切換手段はこの第一または第二の切換信号に
より専用回線を符号化復号化手段を介してＩＳＤＮ回線
への切り換えまたは切り戻しを行う。When a fault occurs in the dedicated line, the first or second switching instruction signal is output from the outside or the instruction signal generating means, and the control means outputs the first or second switching signal. Then, the switching means uses the first or second switching signal to switch the dedicated line to or back from the ISDN line via the encoding/decoding means.
従って、切り換えに必要な公衆電話回線はＩＳＤＮ回線
１回線で済むようになるとともに、ＩＳＤＮ回線により
回線品質が向上される。Therefore, only one ISDN line is required as a public telephone line for switching, and the line quality is improved by the ISDN line.
以下、本発明の実施例について図面を参照して説明する
。Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の第一実施例を示すブロック構成図、お
よび第２図はその通信システムを示すブロック構成図で
ある。FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a block diagram showing its communication system.
本第−実施例は、送信データを変調した送信信号を専用
回線２１に送出し、専用回線２１からの受信信号を復調
し受信データを再生する変復調手段としての変復調Ｂｌ
ｌを備えた変復調装置１０において、本発明の特徴とす
るところの、
変復ｍ装置１０はＩＳＤＮ回線２２に接続され、前記送
信信号を符号化しＩＳＤＮ回線２２に送出し、ＩＳＤＮ
回線２２から受信されたディジタル信号を復号化する符
号化復号化手段としての符号化復号化部１４およびＩＳ
ＤＮインタフ工−ス部１５と、変復調部１１の一端を、
専用口！２１からＩＳＤＮ回線２２に切り換え接続する
第一の切換信号１０１ａまたはＩＳＤＮ回線２２から専
用回線２１に切り戻し接続する第二の切換信号１０１ｂ
により切り換えまたは切り戻しを行う切換手段としての
スイッチ１２および１３と、専用回線２１が障害になっ
たとき、第一または第二の切換指示信号１０２ａまたは
１０２ｂにより第一または第二の切換信号１０１ａまた
は１０１ｂを出力する制御手段としての制御部１６とを
備え、さらに、第一および第二の切換指示信号１０２ａ
または１０２ｂを外部から入力する第一の指示信号入力
端子１７を備えている。In the present embodiment, a modulation/demodulation Bl is used as a modulation/demodulation means that sends a transmission signal obtained by modulating transmission data to a dedicated line 21, demodulates a received signal from the dedicated line 21, and reproduces the received data.
The modem device 10 is connected to the ISDN line 22, encodes the transmission signal, sends it to the ISDN line 22, and transmits the encoded signal to the ISDN line 22, which is a feature of the present invention.
An encoding/decoding unit 14 and an IS as encoding/decoding means for decoding the digital signal received from the line 22
The DN interface section 15 and one end of the modulation/demodulation section 11,
Exclusive mouth! 21 to the ISDN line 22, or a second switching signal 101b to switch back and connect from the ISDN line 22 to the dedicated line 21.
When the switches 12 and 13 as switching means for switching or switching back, and the dedicated line 21 become faulty, the first or second switching instruction signal 102a or 102b causes the first or second switching signal 101a or 101b, and further includes a control unit 16 as a control means for outputting the first and second switching instruction signals 102a.
or 102b from the outside.
次に、本第二実施例において、専用回線２１に障害が発
生した場合のｒｓＤＮバックアップの手順について説明
する。Next, in the second embodiment, a procedure for rsDN backup when a failure occurs in the dedicated line 21 will be described.
外部から第一の指示信号入力端子１７に第一の切換指示
信号１０２ａが入力されると、制御部１６は、第一の切
換信号１０１ａを出力し、これによりスイッチ１２およ
び１３が専用回線２１側からＩＳＤＮ回線２２側に切り
換える。そして、制ｆｉｌｌ１６よりＩＳＤＮインタフ
工−ス部１５を通してＩＳＤＮ呼制御が行われ、相手側
の変復調装置ＩＯとつながると、変復調部１１より出力
された送信信号は、符号化するための符号化復号化部１
４を通って符号化され、さらにＩＳＤＮインタフ工−ス
部１５を通ってＩＳＤ、Ｎ回線２２へと送出される。When the first switching instruction signal 102a is input from the outside to the first instruction signal input terminal 17, the control unit 16 outputs the first switching signal 101a, which causes the switches 12 and 13 to switch to the dedicated line 21 side. to the ISDN line 22 side. Then, ISDN call control is performed from the control fill 16 through the ISDN interface section 15, and when connected to the other party's modem IO, the transmission signal output from the modem section 11 is encoded and decoded. Part 1
4, and is further transmitted to the ISD, N line 22 through the ISDN interface section 15.
このようにしてＩＳＤＮバツクアツプが行われ、その後
専用回線２１が復旧した場合には、再び外部から第一の
指示信号入力端子１７に第二の切換指示信号１０２ｂを
入力すると、スイッチ１２および１３が専用回線２１側
に切り換わり、通常の通信状態に戻ることができる。When the ISDN backup is performed in this way and the dedicated line 21 is restored after that, when the second switching instruction signal 102b is input from the outside to the first instruction signal input terminal 17 again, the switches 12 and 13 are switched to the dedicated It is possible to switch to the line 21 side and return to the normal communication state.
第３図は本発明の第二実施例を示すブロック構成図であ
る。FIG. 3 is a block diagram showing a second embodiment of the present invention.
本第二実施例の変復調装置１０ａは、第１図の第一実施
例において、第一の指示信号入力端子１７に代えて、本
発明の特徴とするところの、専用回線２１の通信状態を
監視し専用回線２１の障害を検出したとき、専用回線２
１をＩＳＤＮ回線２２に切り換える第一の切換指示信号
１０２ａを出力し、専用回線２１の障害が回復したとき
、外部から入力される指示信号１０３により、ｒｓＤＮ
回線２２から専用回線２１に切り戻す第二の切換指示信
号１０２ｂを出力する指示信号発生手段としての指示信
号発生部１８と、外部から指示信号１０３を人力する第
二の指示信号入力端子１９とを備えたことにある。The modem 10a of the second embodiment monitors the communication state of the dedicated line 21, which is a feature of the present invention, instead of the first instruction signal input terminal 17 in the first embodiment of FIG. When a fault in the dedicated line 21 is detected, the dedicated line 2
1 to the ISDN line 22, and when the fault in the dedicated line 21 is recovered, an instruction signal 103 input from the outside causes the rsDN line to switch to the ISDN line 22.
An instruction signal generation unit 18 as an instruction signal generation means for outputting a second switching instruction signal 102b for switching back from the line 22 to the dedicated line 21, and a second instruction signal input terminal 19 for manually inputting an instruction signal 103 from the outside. It's about being prepared.
従って、本第二実施例は、第一実施例と同様に動作する
とともに、専用回線２１が障害になったとき、自動的に
ＩＳＤＮ回線２２に切り換わる利点がある。Therefore, the second embodiment operates in the same manner as the first embodiment, and has the advantage of automatically switching to the ISDN line 22 when the dedicated line 21 becomes faulty.
ご発明の効果〕
以上説明したように、本発明は、専用回線に障害が発生
した場合に、ＩＳＤＮ回線でバックアップするため、従
来の公衆電話回線でバックアップする場合には、２回線
必要であったのに対して１回線あれば良く、また、回線
品質も従来に比べて高くなる効果がある。[Effects of the Invention] As explained above, the present invention uses the ISDN line for backup in the event of a failure in the dedicated line, so two lines were required when backing up using the conventional public telephone line. In contrast, only one line is required, and the line quality also has the effect of being higher than in the past.
第１図は本発明の第一実施例を示すブロック構成図。
第２図はそれによる通信システムを示すブロック構成図
。
第３図は本発明の第二実施例を示すブロック構成図。
１０、ＩＣ１ａ・・・変復調装置、１１・・・変復調部
、１２．１３・・・スイッチ、１４・・・符号化復号化
部、１５・・・ＩＳＤＮインタフ工−ス部、１６・・・
制御部、１７．１９・・・指示信号入力端子、１８・・
・指示信号発生部、２１・・・専用回線、２２−Ｉ Ｓ
Ｄ Ｎ 回！、１０１ａ、 １０１ｂ−切ｍ（ｉ号、
１０２ａ、１０２１］・・・切換指示信号、１０３・・
・指示信号。FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 2 is a block configuration diagram showing a communication system based on this. FIG. 3 is a block diagram showing a second embodiment of the present invention. 10, IC1a...Modulation/demodulation device, 11...Modulation/demodulation unit, 12.13...Switch, 14...Encoding/decoding unit, 15...ISDN interface unit, 16...
Control unit, 17.19... Instruction signal input terminal, 18...
・Instruction signal generation unit, 21... Dedicated line, 22-IS
D N times! , 101a, 101b-cut m (No. i,
102a, 1021]...Switching instruction signal, 103...
・Instruction signal.
Claims (1)
、前記専用回線からの受信信号を復調し受信データを再
生する変復調手段を備えた変復調装置において、 前記変復調装置はＩＳＤＮ回線に接続され、前記送信信
号を符号化し前記ＩＳＤＮ回線に送出し、前記ＩＳＤＮ
回線から受信されたディジタル信号を復号化する符号化
復号化手段と、 前記変復調手段の一端を、前記専用回線から前記ＩＳＤ
Ｎ回線に切り換え接続する第一の切換信号または前記Ｉ
ＳＤＮ回線から前記専用回線に切り戻し接続する第二の
切換信号により切り換えまたは切り戻しを行う切換手段
と、 前記専用回線が障害になったとき、第一または第二の切
換指示信号により前記第一または第二の切換信号を出力
する制御手段と を備えたことを特徴とする変復調装置。 ２、前記第一および第二の切換指示信号を外部から入力
する第一の指示信号入力端子を備えた請求項１記載の変
復調装置。 ３、前記専用回線の通信状態を監視し障害を検出したと
き前記第一の切換指示信号を出力し、外部からの指示信
号により前記第二の切換指示信号を出力する切換指示信
号発生手段と、外部からの前記指示信号を入力する第二
の指示信号入力端子とを備えた請求項２記載の変復調装
置。[Claims] 1. A modulation/demodulation device comprising modulation/demodulation means for transmitting a transmission signal obtained by modulating transmission data to a dedicated line, demodulating a received signal from the dedicated line, and reproducing the received data, wherein the modulation/demodulation device comprises: connected to an ISDN line, encodes the transmission signal and sends it to the ISDN line, and
encoding/decoding means for decoding a digital signal received from the line; and one end of the modulation/demodulation means is connected from the dedicated line to the ISD
A first switching signal for switching and connecting to the N line or the above-mentioned I
a switching means for switching or switching back from the SDN line to the dedicated line by means of a second switching signal; or a control means for outputting a second switching signal. 2. The modulation/demodulation device according to claim 1, further comprising a first instruction signal input terminal for externally inputting the first and second switching instruction signals. 3. Switching instruction signal generating means that monitors the communication state of the dedicated line and outputs the first switching instruction signal when a failure is detected, and outputs the second switching instruction signal in response to an external instruction signal; 3. The modulation/demodulation device according to claim 2, further comprising a second instruction signal input terminal for inputting the instruction signal from outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681590A JPH03220852A (en) | 1990-01-25 | 1990-01-25 | Modulator-demodulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681590A JPH03220852A (en) | 1990-01-25 | 1990-01-25 | Modulator-demodulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03220852A true JPH03220852A (en) | 1991-09-30 |
Family
ID=11926670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1681590A Pending JPH03220852A (en) | 1990-01-25 | 1990-01-25 | Modulator-demodulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03220852A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0585061A3 (en) * | 1992-08-25 | 1994-04-13 | Northern Telecom Ltd |
-
1990
- 1990-01-25 JP JP1681590A patent/JPH03220852A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0585061A3 (en) * | 1992-08-25 | 1994-04-13 | Northern Telecom Ltd |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5768308A (en) | System for TDMA mobile-to-mobile VSELP codec bypass | |
| US5619252A (en) | Video telephone system and method for transmitting and receiving signals when there is a failure in the system | |
| JPH0752845B2 (en) | Differential encoding circuit | |
| JPS6046650A (en) | Communication line control system | |
| US6195702B1 (en) | Modem for maintaining connection during loss of controller synchronism | |
| KR100317251B1 (en) | Apparatus for multiplexing line | |
| JPH04144453A (en) | Modulator/demodulator | |
| JP3338197B2 (en) | Interface converter | |
| JPH01189273A (en) | Private line backup device | |
| JP2932480B2 (en) | Spectrum inversion confidential method | |
| JP2573265B2 (en) | Terminal interface circuit | |
| JPH0846723A (en) | Mutual communication system between different videophones | |
| KR0178765B1 (en) | Implimentation method of communication protocol | |
| KR960027938A (en) | Digital trunk line connection device | |
| JP2556163B2 (en) | Transmission circuit for ISDN subscriber line | |
| JPS59122175A (en) | Facsimile communication system | |
| JPH04162859A (en) | Line changeover device | |
| JPH06105004A (en) | Terminal adapter | |
| JPH03145255A (en) | Data processing method of data transmission equipment | |
| JPH11252384A (en) | Facsimile equipment | |
| JPS6384339A (en) | Communication control processor | |
| JPS62271549A (en) | Switching system for digital subscriber | |
| JPH04134942A (en) | Communication line switching system at fault state of modem | |
| JPH0295082A (en) | Charging information sending system | |
| JPH0275239A (en) | Secondary channel system |