JPS63193743A - Data modulator/demodulator - Google Patents
Data modulator/demodulatorInfo
- Publication number
- JPS63193743A JPS63193743A JP62024758A JP2475887A JPS63193743A JP S63193743 A JPS63193743 A JP S63193743A JP 62024758 A JP62024758 A JP 62024758A JP 2475887 A JP2475887 A JP 2475887A JP S63193743 A JPS63193743 A JP S63193743A
- Authority
- JP
- Japan
- Prior art keywords
- communication speed
- call
- modulation
- bps
- demodulation
- 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
- 238000004891 communication Methods 0.000 claims abstract description 42
- 238000001514 detection method Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Communication Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は相手局の通信速度に自動的に追従することか
できるデータ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 data modulation/demodulation device that can automatically follow the communication speed of a partner station.
最近、データ変復調装置はＣＣＩＴＴ勧告Ｖ２勧告単２
２た機能とＣＣＩＴＴ勧告Ｖ２勧告単２１た機能の両方
を持つものが多い。このＣＣＩＴＴ勧告Ｖ２勧告単２２
た変復調装置は、通信速度が１２００ｂｐｓでデータ通
信状態になるまでに定められたハンドシェークパターン
がある。一方、ＣＣＩＴＴＶ２１に準拠した変復調装置
は、通信速度が３００ｂｐｓでハンドシェークパターン
はなく、すぐにデータ通信状態になる。そこで、従来、
通信速度の設定は相手局が１２００ｂｐｓなら手動によ
シ自局も１２００ｂｐｓに設定し相手局が３００ｂｐｓ
なら手動によシ自局も３００ ｂｐ−に設定している。Recently, data modem equipment is CCITT Recommendation V2 Recommendation AA
Many of them have both the functions of CCITT Recommendation V2 and Recommendation A21 of CCITT Recommendation V2. This CCITT Recommendation V2 Recommendation AA22
The modem has a communication speed of 1200 bps and has a predetermined handshake pattern before entering the data communication state. On the other hand, a modem device compliant with CCITTV21 has a communication speed of 300 bps, has no handshake pattern, and immediately enters a data communication state. Therefore, conventionally,
Set the communication speed manually if the other station is 1200bps, and set the own station to 1200bps and the other station is 300bps.
If so, I manually set my own station to 300 bp.
そこで、近時相手局の通信速度が１２００ｂｐｓか３０
０ ｂｐｓかわからないときＫは通信速度を設定できな
いので、相手局の通信速度に自動的に追従してデータ通
信する方法、すなわち通信速度が１２００ｂｐｓのとき
Ｋａハンドシェークパターンがあるが、通信速度が３０
０ｂｐｓのときにはハンドシェークパターンが々いため
１２００ｂｐｓと３００ｂｐｓと同時に監視することは
できないので、ｃＡ）待機状態で１２００ｂｌ）８とし
相手局からの１２００ｂｐＨのハンドシェークパターン
が検出できなければ３００ｂｐｓに切替える、（Ｂ）待
機状態を３００ ｂｐｓとし相手局からＣＤ ３００
ｂｐｓ ＯＦＺパターンを検出できなければ１２００
ｂｐｓに切替えるなどの方法が考えられる。Therefore, recently the communication speed of the other station is 1200bps or 30bps.
If you don't know 0 bps, K cannot set the communication speed, so there is a method to automatically follow the communication speed of the other station and communicate data. In other words, there is a Ka handshake pattern when the communication speed is 1200 bps, but if the communication speed is 30 bps,
Since there are many handshake patterns at 0 bps, it is not possible to simultaneously monitor 1200 bps and 300 bps, so cA) 1200 bps in standby mode) 8, and if no 1200 bph handshake pattern from the other station is detected, switch to 300 bps, (B) Standby. Set the status to 300 bps and send CD 300 from the other station.
bps 1200 if OFZ pattern cannot be detected
Possible methods include switching to bps.
上述した従来のデータ変復調装置は、特に前者（４）の
場合には相手局が発呼側になっていたとき、１２００
ｂｐｓから３００ｂｐｓに切替えるまで１２００ｂｐａ
のハンドシェークパターン（スクランブルされない２進
１）Ｋよって相手局の端末に誤った受信データを出して
しまう欠点があシ、後者ω）の場合には相手局に対し３
００ ｂｐｓの場合は必ずデータ通信状態になる前にＦ
Ｚパターンを送出しなければならないという制限事項が
必要となる（ＣＣＩＴＴＶ２１にはこの制限事項はない
）。また、どちらの局もこのような自動識別方法をとる
変復調装置罠なっていたとき、３００ｂｐｓの通信速度
でしかデータ通信できなくなる（手順上１２００ｂｐδ
の通信速度になることはない）などという欠点がある。Especially in the former case (4), when the other party is the calling party, the conventional data modulator/demodulator described above
1200bpa until switching from bps to 300bps
The handshake pattern (unscrambled binary 1) K has the drawback of outputting incorrect received data to the terminal of the other station.In the case of the latter ω), 3
00 bps, be sure to press F before entering the data communication state.
A restriction that a Z pattern must be sent is required (CCITTV21 does not have this restriction). In addition, if both stations are equipped with modem devices that use this automatic identification method, data communication will only be possible at a communication speed of 300 bps (procedurally, 1200 bps δ
The disadvantage is that the communication speed will never reach
この発明のデータ変復調装置は、発呼時には第１通信速
度で待機状態にし、着呼時には第２通信状態で待機状態
にし、発呼側では第１通信速度のハンドシェークパター
ンが検出できなければ第２通信速度に切替時間Ｔ、で切
替え、着呼側ではキャリアを検出できなければ第１通信
速度に切替時間Ｔｔ （ただしＴ、 ＞ ’ｒ、 ）で
切替えるようＫしたものである。The data modulation/demodulation device of the present invention is in a standby state at a first communication speed when a call is made, is in a standby state at a second communication state when a call is received, and if a handshake pattern of the first communication speed cannot be detected on the calling side, the data modem is in a standby state at a first communication speed. The communication speed is switched at a switching time T, and if the called side cannot detect a carrier, it is set to switch to the first communication speed at a switching time Tt (T, >'r, ).
この発明は相手局の通信速度に自動的に追従することが
できる。This invention can automatically follow the communication speed of the other station.
第１図はこの発明に係るデータ変復調装置の一実施例を
示すブロック図である。同図において、１は図示せぬ電
話回線に接続された入出力端子、２はこの入出力端子１
に入力する信号の電力を検出するキャリア検出回路、３
は第１通信速度例えばＣＣＩＴＴ勧告Ｖ ２２ Ｏ１２
００ｂｐｓ ％−ドの変復調を行なう第１変復調部、４
は第２通信速度例えばＣＣＩＴＴ勧告Ｖ ２１ Ｏ３０
０ｂｐｓ モー ）”Ｏ変復ｇを行なう第２変復調部、
５は前記キャリア検出回路２からの入力信号、第１変復
調部３からの入力信号および第２変復調部４からの入力
信号をそれぞれ監視し、通信速度を自動識別して第１変
復調部３および第２変復調部４を制御する制御部でおる
。FIG. 1 is a block diagram showing an embodiment of a data modulation/demodulation device according to the present invention. In the figure, 1 is an input/output terminal connected to a telephone line (not shown), and 2 is this input/output terminal 1.
a carrier detection circuit that detects the power of a signal input to the 3
is the first communication speed, for example, CCITT recommendation V 22 O12
a first modulation/demodulation section that performs modulation/demodulation of 00 bps %-mode;
is the second communication speed, e.g. CCITT Recommendation V 21 O30
a second modulation/demodulation section that performs O modulation/demodulation (0 bps);
5 monitors the input signal from the carrier detection circuit 2, the input signal from the first modulation/demodulation section 3, and the input signal from the second modulation/demodulation section 4, automatically identifies the communication speed, This is a control section that controls the 2 modem/demodulator 4.
なお、第２図において、６は上記構成によるデータ変復
調装置であシ、ＵＢｌは１２００ｂｐｓのハンドシェー
クパターンでスクランブルされない２進１を示し、８Ｂ
１は１２００ｂｐａのハンドシェークパターンでスクラ
ンブルされた２進１を示す。In addition, in FIG. 2, 6 is a data modulation/demodulation device with the above configuration, UB1 indicates an unscrambled binary 1 with a handshake pattern of 1200 bps, and 8B
1 represents a scrambled binary 1 with a 1200 bpa handshake pattern.
次に上記構成によるデータ変復調装置の動作について第
２図（イ）〜第２図（ホ）を参照して説明する。Next, the operation of the data modulation/demodulation apparatus having the above configuration will be explained with reference to FIGS. 2(A) to 2(E).
まず、データ変復調装置６が発呼時には１２００ｂｐｌ
！で待機状態になる。したがって、第２図（イ）に示す
ように着呼側から１２００ｂｐｆｉのＵＢＩを受けると
、ＳＢＩを発呼することによＦ） １２００ｂｐｇで相
互に通信することができる。また、第２図（ロ）に示す
ように１着呼側は３００ｂｐｓの変調波を送ると発呼側
のデータ変復調装置６は１２００ｂｐｓのハンドシェー
クパターンを検出できないため、切替時間Ｔ。First, when the data modem 6 makes a call, the output is 1200 bpl.
! goes into standby mode. Therefore, when a UBI of 1200 bpfi is received from the called side as shown in FIG. Further, as shown in FIG. 2(b), when the called side sends a modulated wave of 300 bps, the data modulation/demodulation device 6 of the calling side cannot detect the 1200 bps handshake pattern, so the switching time T is shortened.
をもって３００ｂｐｓに切替えて３００ｂｐｇの変調波
を出力する。これにより、３００ｂｐｓで相互に通信を
行なうことができる。また、第２図（今に示すように着
呼側のデータ変復調装置６は３００ｂｐａの変調波を送
るが相手側からのキャリアを検出できないときには、切
替時間Ｔｔ （ただしＴｌ ＜ Ｔｔ ）をもって１２
００ ｂｐｓに切替えてＵＢＩを送る。そして、発呼側
のデータ変復調装置６は切替時間で１以内にｔＪＢｌを
検出できないので、ＳＢ１を送ることによ’） １２０
０ｂｐｓで相互に通信を行なうことができる。Then, it switches to 300 bps and outputs a modulated wave of 300 bps. This allows mutual communication at 300 bps. In addition, as shown in FIG. 2, when the data modulation/demodulation device 6 on the called side sends a modulated wave of 300 bpa but cannot detect a carrier from the other party, the data modulation/demodulation device 6 on the called side sends a modulated wave of 300 bpa.
00 bps and sends UBI. Then, since the data modulation/demodulation device 6 on the calling side cannot detect tJBl within the switching time of 1, it sends SB1') 120
They can communicate with each other at 0 bps.
次に、データ変復調装置６が着呼時にはａｏｏｂｐｓで
待機状態になる。したがって、第２図に）Ｋ示すように
３００ｂｐｓの変調波を送るが、相手側からのキャリア
を検出できないときには切替時間Ｔ２（ただしＴ、 ＜
ＴＩ ）をもって１２００ｂｐｓに切替えてＵＢＩを
送る。そして、発呼側からＳＢＩを受けることＫよ１）
１２００ｂｐａで相互に通信することができる。Next, when the data modulation/demodulation device 6 receives a call, it enters a standby state at aoo bps. Therefore, as shown in FIG.
TI), switch to 1200 bps and send UBI. Then, receive the SBI from the calling party.1)
They can communicate with each other at 1200 bpa.
また、第２図（ホ）に示すように、発呼側は３００ｂｐ
ｓの変調波を受け、３００ｂｐｓの変調波を送ることに
よｆｉ １２００ｂｐ８で相互に通信することができる
。Also, as shown in Figure 2 (E), the calling side uses 300bp
By receiving a modulated wave of s and sending a modulated wave of 300 bps, it is possible to communicate with each other at fi 1200 bp8.
なお、切替時間Ｔ、＜切替時間Ｔ、の場合にはどちらの
局も３００ ｂｐａの通信速度でしかデータ通信できな
いため、必ず上述したように切替時間Ｔ、＞切替時間Ｔ
、でなければならないことはもちろんである。また、上
述の実施例では第１通倍速度として１２００ｂｐｓ 、
第２通倍速度として３００ ｂｐｓを用いたがこれに限
定せずに実施できることはもちろんである。Note that in the case of switching time T, < switching time T, both stations can only communicate data at a communication speed of 300 bpa, so as mentioned above, switching time T, > switching time T
, of course. In addition, in the above-mentioned embodiment, the first multiplication speed is 1200 bps,
Although 300 bps is used as the second multiplication speed, it goes without saying that the present invention is not limited to this.
以上詳細に説明したように、この発明に係るデータ変復
調装置によれば、相手局の通信速度を識別しその通信速
度に自動的に追従することができるなどの効果がある。As described above in detail, the data modulation/demodulation device according to the present invention has the advantage of being able to identify the communication speed of the other station and automatically follow that communication speed.
第１図はこの発明に係るデータ変復調装置の一実施例を
示すブロック図、第２図（イ）〜第２図（ホ）は第１図
の動作を示す図である。
１・・・・・・入出力端子、 ２・・・・・・キャリ
ア検出回路、３・・・・・・第１変調部、 ４・・・・
・・第２変調部、 ５・・・・・・制御部。FIG. 1 is a block diagram showing an embodiment of a data modulation/demodulation device according to the present invention, and FIGS. 2(A) to 2(E) are diagrams showing the operation of FIG. 1. 1... Input/output terminal, 2... Carrier detection circuit, 3... First modulation section, 4...
...Second modulation section, 5...Control section.
Claims (1)
を検出するキャリア検出回路と、第１の通信速度で変復
調を行なう第１変復調部と、第２の通信速度で変復調を
行なう第２変復調部と、この第１変復調部の出力、第２
変復調部の出力およびキャリア検出回路の出力が入力し
、発呼時は第１の通信速度で待機し相手局が第１の通信
速度でなければ時間Ｔ＿１後に第２の通信速度に切替わ
り、着呼時は第２の通信速度で待機し相手局が第２の通
信速度でなければ時間Ｔ＿２（ただしＴ＿２＜Ｔ＿１）
後に第１の通信速度に切替わるように第１変復調部およ
び第２変復調部を制御する制御部とを備えたことを特徴
とするデータ変復調装置。a carrier detection circuit that detects the power of a signal input to an input/output terminal connected to a telephone line; a first modem section that performs modulation and demodulation at a first communication speed; and a second modulation and demodulation section that performs modulation and demodulation at a second communication speed. section, the output of this first modulation/demodulation section, and the second
The output of the modulation/demodulation section and the output of the carrier detection circuit are input, and when making a call, it waits at the first communication speed, and if the other party is not at the first communication speed, it switches to the second communication speed after time T_1, and the call is received. When making a call, standby at the second communication speed, and if the other party is not at the second communication speed, the time is T_2 (however, T_2<T_1)
A data modulation/demodulation device comprising: a control unit that controls a first modulation/demodulation unit and a second modulation/demodulation unit so as to switch to a first communication speed later.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62024758A JPS63193743A (en) | 1987-02-06 | 1987-02-06 | Data modulator/demodulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62024758A JPS63193743A (en) | 1987-02-06 | 1987-02-06 | Data modulator/demodulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63193743A true JPS63193743A (en) | 1988-08-11 |
Family
ID=12147048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62024758A Pending JPS63193743A (en) | 1987-02-06 | 1987-02-06 | Data modulator/demodulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63193743A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04354440A (en) * | 1991-05-31 | 1992-12-08 | Fujitsu Ltd | Communication equipment |
-
1987
- 1987-02-06 JP JP62024758A patent/JPS63193743A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04354440A (en) * | 1991-05-31 | 1992-12-08 | Fujitsu Ltd | Communication equipment |
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