JPH03212041A - Transmission repeater - Google Patents

Transmission repeater

Info

Publication number
JPH03212041A
JPH03212041A JP803390A JP803390A JPH03212041A JP H03212041 A JPH03212041 A JP H03212041A JP 803390 A JP803390 A JP 803390A JP 803390 A JP803390 A JP 803390A JP H03212041 A JPH03212041 A JP H03212041A
Authority
JP
Japan
Prior art keywords
transmission
period
frame
output
transmission frame
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.)
Granted
Application number
JP803390A
Other languages
Japanese (ja)
Other versions
JP2542714B2 (en
Inventor
Toru Ito
徹 伊藤
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.)
Fuji Electric Co Ltd
Fuji Facom Corp
Original Assignee
Fuji Electric Co Ltd
Fuji Facom 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 Fuji Electric Co Ltd, Fuji Facom Corp filed Critical Fuji Electric Co Ltd
Priority to JP2008033A priority Critical patent/JP2542714B2/en
Publication of JPH03212041A publication Critical patent/JPH03212041A/en
Application granted granted Critical
Publication of JP2542714B2 publication Critical patent/JP2542714B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To ensure the pause period of a transmission repeater in a next stage or a demodulation control section of a transmitter and to connect transmission repeaters of lots of number of stages by providing a function controlling the transmission of a succeeding transmission frame for a prescribed period from the end of the transmission frame sent to a transmission line to the transmission repeater. CONSTITUTION:Output permitting signals OP1 (OP1a, OP1b) inputted to drivers 4a, 4b are sent via output correction sections 8 (8a, 8b). The output correction sections 8 (8a, 8b) suppress the output of the output permitting signals OP1a, OP1b for a prescribed period (longer than demodulation control section pausing period) from the end of a closest transmission frame. Thus, even when lots of stages of transmission repeaters 1 are connected to transmission lines 2a, 2b, the transmission of a transmission frame on the transmission lines 2a, 2b is avoided for a narrower period than the pausing period of the demodulation connection section.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

この発明は、バス型の伝送路形態をもつ伝送システムに
おいて、各伝送路間を接続する伝送中継装置に関する。 なお以下各図において同一の符号は同一もしくは相当部
分を示す。
The present invention relates to a transmission relay device that connects transmission lines in a transmission system having a bus-type transmission line configuration. Note that in the following figures, the same reference numerals indicate the same or corresponding parts.

【従来の技術】[Conventional technology]

第5図は従来の伝送中継装置の構成図であり、第6図は
第5図のフレーム中継動作説明用のタイムチャートであ
る。 第5図において1は伝送中継装置、2(2a、2b)は
この中継装置を介して互に伝送フレームを授受する伝送
路、3 (3a、3b)はそれぞれ対応する伝送路2a
、2bから伝送フレームを受信するレシーバ、5はレシ
ーバ3が受信した伝送フレームを復調し、該フレームか
らデジタルデータを取出す復調制御部、6は復調制御部
によって抽出された前記デジタルデータを再び変調した
り、この変調データの前後にダミーキャリアを附したり
する変調制御部、7は伝送フレームの中継のだめの送受
信を制御する中継制御部、4(4a、4b)はそれぞれ
中継制御部7の出力許可OP (OPa  0Pb)に
よって有効化され、変調制御部6から出力された変調デ
ータD1をそれぞれ対応する伝送路2a。 2勢に送出するドライ八である。 次に第6図を参照しつつ第5図の動作を説明すると、伝
送路2aより伝送中継装置1に到着したフレームX1は
、レシーバ3aで受信され、復調制御部5でデジタルデ
ータに再生(復調)されたのち、変調制御部6で再度変
調され、ドライバ4a、4bに送られる。中継制御部7
は、伝送フレームX1が伝送路2aから来たことを認識
し、再生した伝送フレームを伝送路2b側に送出するた
めトライバ4bの出力許可(信号)OPbをアクティブ
にする。これにより伝送フレームY1が遅延TI後に伝
送路2bに送出される。 伝送フレームが復調制御部5で再生される際には、第6
図の伝送フレームス1中の正味データの先頭に附された
ダミーキャリア■は復調制御部5の初期化に使用される
のみで、再生データにはならない。また同様に伝送フレ
ームX1の正味ブタの末尾に付されたダミーキャリア■
も再生データにはならず、正味データのみが再生データ
となる。 このため再生データ(正味データ)を変調制御部6で再
変調する際には、再生データを変調したものの前後に、
中継制御部7の出力許可OPの出力タイミングに基づい
て次段の伝送中継装置または伝送装置の受信を確実に保
証するためのダミーキャリア(第6図■、■)が付加さ
れる。この場ダミーキャリア■、■、■、■の長さには
、の関係がある。 伝送フレームX1のT2後に伝送中継装置1に到着した
伝送フレームX2も同様に伝送フレームY2として送出
される。伝送フレームY1と伝送フレームY2の間隔T
3は、前記式1の関係から、T2より小さくなる。以上
のように、伝送中継装置を通過する毎に、伝送フレーム
の間隔は狭まっていく。
FIG. 5 is a block diagram of a conventional transmission relay device, and FIG. 6 is a time chart for explaining the frame relay operation of FIG. In FIG. 5, 1 is a transmission relay device, 2 (2a, 2b) is a transmission line that exchanges transmission frames with each other via this relay device, and 3 (3a, 3b) is a corresponding transmission line 2a.
, 2b, a demodulation control section 5 demodulates the transmission frame received by the receiver 3 and extracts digital data from the frame, and 6 modulates the digital data extracted by the demodulation control section again. 7 is a relay control unit that controls the relay transmission and reception of the transmission frame, and 4 (4a, 4b) are output permissions of the relay control unit 7, respectively. The transmission paths 2a respectively correspond to the modulation data D1 that is enabled by the OP (OPa 0Pb) and output from the modulation control unit 6. This is a dry eight that will be sent to the second group. Next, to explain the operation of FIG. 5 with reference to FIG. 6, frame ), the signal is modulated again by the modulation control section 6, and sent to the drivers 4a and 4b. Relay control section 7
recognizes that the transmission frame X1 has come from the transmission path 2a, and activates the output permission (signal) OPb of the driver 4b in order to send the reproduced transmission frame to the transmission path 2b side. As a result, the transmission frame Y1 is sent to the transmission path 2b after the delay TI. When the transmission frame is reproduced by the demodulation control section 5, the sixth
The dummy carrier (3) attached to the beginning of the net data in the transmission frame 1 in the figure is only used for initializing the demodulation control unit 5 and does not become reproduced data. Similarly, the dummy carrier ■ attached to the end of the net pig of transmission frame X1
However, only the net data becomes playback data. For this reason, when re-modulating the reproduced data (net data) by the modulation control section 6, before and after the modulated reproduced data,
Based on the output timing of the output permission OP of the relay control unit 7, a dummy carrier (■, ■ in FIG. 6) is added to ensure reception by the next-stage transmission relay device or transmission device. In this case, the lengths of the dummy carriers ■, ■, ■, ■ have the following relationships. Transmission frame X2, which arrived at transmission relay device 1 after T2 of transmission frame X1, is similarly sent out as transmission frame Y2. Interval T between transmission frame Y1 and transmission frame Y2
3 is smaller than T2 from the relationship of Equation 1 above. As described above, the interval between transmission frames narrows each time the transmission frame passes through a transmission relay device.

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

伝送中継装置および伝送装置の復調制御部は、1つの伝
送フレームの復調後、次の伝送フレームを復調可能にな
るまでに一定以上の期間(後述の復調制御部休止期間T
R)が必要である。従来の伝送中継装置においては、伝
送中継装置を通過するごとに伝送フレームの間隔が狭ま
るため、伝送中継装置の段数が多い場合には、復調制御
部休止期間より狭い間隔で伝送路上を伝送フレームが流
れ、伝送中継装置および伝送装置で復調に失敗すること
があった。即ち第6図の中継によって新たに伝送路に送
出された伝送フレームの間隔T3が復調制御部休止期間
TRより小さくなると伝送路2b上の伝送中継装置およ
び伝送装置で復調に失敗する。 そこでこの発明の課題は、伝送路上に伝送中継装置が多
数段接続されても、復調制御部休止期間より狭い間隔で
伝送路上を伝送フレームが流れることのない伝送中継装
置を提供することにある。
After the demodulation control unit of the transmission relay device and the transmission device demodulates one transmission frame, it takes a certain period or more (demodulation control unit suspension period T to be described later) before the next transmission frame can be demodulated.
R) is required. In conventional transmission relay equipment, the interval between transmission frames narrows each time the transmission frame passes through the transmission relay equipment, so when there are many stages of transmission relay equipment, the transmission frames are transmitted on the transmission path at intervals narrower than the demodulation control section pause period. However, demodulation sometimes failed at the transmission relay device and the transmission device. That is, if the interval T3 of the transmission frame newly sent to the transmission line by the relay shown in FIG. 6 becomes smaller than the demodulation control unit rest period TR, demodulation will fail in the transmission repeater and the transmission apparatus on the transmission line 2b. SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission relay device in which transmission frames do not flow on the transmission path at intervals narrower than the demodulation control unit pause period even if multiple transmission relay devices are connected on the transmission path.

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

前記の課題を解決するために本発明の装置は、「一方の
伝送路(2aなど)から入力した伝送フレーム中のデー
タを(復調制御部5などを介し)復調し、このデータを
(中継制御部7.変調制御部6などを介し)再び変調し
、かつこの変調データの前後にそれぞれダミーキャリア
を付し、 (ドライバ4などを介し)新たな伝送フレー
ムとして他方の伝送路(2bなど)に送出する伝送中継
装置(1など)において、 送出した前記伝送フレームの末尾から一定の期間(復調
制御部休止期間TRなど)、後続の伝送フレームを送出
することを抑制する手段(出力補正部8など)を備えた
jものとする。
In order to solve the above problems, the device of the present invention demodulates data in a transmission frame input from one transmission path (such as 2a) (via demodulation control section 5, etc.), and uses this data (through relay control). Part 7. Modulate the data again (via the modulation control unit 6, etc.), add dummy carriers before and after this modulated data, and send it to the other transmission line (2b, etc.) as a new transmission frame (via the driver 4, etc.). In a transmission relay device (such as 1) that transmits, means for suppressing transmission of a subsequent transmission frame (such as output correction unit 8) for a certain period (such as a demodulation control section rest period TR) from the end of the transmitted transmission frame. ).

【作 用】[For use]

伝送路へ送出した伝送フレームの末尾から復調制御部休
止期間以上の一定の期間、後続の伝送フレームを送出す
ることを抑制する手段を設ける。
Means is provided for suppressing the transmission of subsequent transmission frames for a fixed period longer than the demodulation control unit rest period from the end of the transmission frame sent to the transmission path.

【実施例】【Example】

以下第1図ないし第4図を用いて本発明の詳細な説明す
る。第1図はこの発明の実施例を示す構成図で第5図に
対応するものである。第1図において第5図と異なる点
は、ドライバ4a、4bに入力される出力許可(信号)
 OPI(OPla、 OP lb)がそれぞれ出力補
正部8 (8a 、8b)を経由している点である。出
力補正部8a、8bはそれぞれ送出された直近の伝送フ
レームの末尾から一定の期間(前記復調制御部休止期間
TRより長い期間)出力許可(信号)OPla、0Pl
bの出力を抑える1肋きをする。 第2図に出力補正部8の回路例を中継制御部7、変調部
6、ドライバ4と共に示す。同図では、中継制御部7か
らの出力許可(信号)OPの立下がりにより、出力補正
部8内のワンショットパルス発生回路9から復調制御部
休止期間TRより長い幅を持ったパルス9aを出力させ
て、出力許可(信号)OPを一方の端子に入力するAN
Dゲート10の他方の反転入力端子に与え、前記パルス
9aが消滅するまで、このANDゲートlOを閉して、
このANDゲート10が入力した中継制御部出力許可(
信号)OPを新たなドライバ出力許可(信号)OPI 
としてドライバ4に出力することを抑制している。 第3図、第4図は第2図の動作説明用のタイムチャート
である。 ここで第31は、後続の伝送フレームが復調制御部休止
期間TR後に送出される場合である。後続のフレームは
ワンショットパルス発生回路9から発生するパルス9a
が“0゛になった後に送出されるため、変調制御部6か
らドライバ4に与えられる変調データD1がそのままド
ライバ4から伝送路2に送出データD2として出力され
、次段の伝送中継装置、或は伝送装置に到達する。 第4図は、後続の伝送フレームが復調制御部休止期間T
R内に送出される場合である。後続の伝送フレームはワ
ンショットパルス発生回路9から発生するパルス9aが
0゛になる前に中継制御部7の出力許可OPが出力され
ることによって、変調制御部6から8カされる。しかし
ドライバ4はワンシジットパルス出力9aが°“0”°
になってからドライバ出力許可○P1によって有効化さ
れるため、第4図の送出データD2の後続伝送フレーム
のように、その先頭のダミーキャリア■の先端の1部が
欠落してドライバ4から伝送路2に出力される。これに
より、次段の伝送中継装置、或は伝送装置の復調制御部
休止期間TRが確保される。なおダミーキャリアの一部
が欠落しても次段の伝送中継装置、或は伝送装置の復調
制御部では復調可能である。 また、ワンショットパルス発生回路9は、単安定マルチ
バイブレーク回路、カウンタ回路等の比較的簡単な回路
で構成することができる。
The present invention will be explained in detail below using FIGS. 1 to 4. FIG. 1 is a block diagram showing an embodiment of the present invention, and corresponds to FIG. 5. The difference between FIG. 1 and FIG. 5 is the output permission (signal) input to drivers 4a and 4b.
The point is that the OPIs (OPla, OPlb) each pass through the output correction section 8 (8a, 8b). The output correction units 8a and 8b respectively output permission (signals) OPla and 0Pl for a certain period (period longer than the demodulation control unit rest period TR) from the end of the most recently transmitted transmission frame.
Make one step to suppress the output of b. FIG. 2 shows an example of the circuit of the output correction section 8 along with the relay control section 7, modulation section 6, and driver 4. In the figure, when the output permission (signal) OP from the relay control section 7 falls, the one-shot pulse generation circuit 9 in the output correction section 8 outputs a pulse 9a having a width longer than the demodulation control section rest period TR. AN and input the output permission (signal) OP to one terminal.
is applied to the other inverting input terminal of the D gate 10, and this AND gate lO is closed until the pulse 9a disappears,
Relay control unit output permission input by this AND gate 10 (
Signal) OP to enable new driver output (signal) OPI
As a result, output to the driver 4 is suppressed. 3 and 4 are time charts for explaining the operation of FIG. 2. Here, the 31st case is a case where the subsequent transmission frame is sent out after the demodulation control unit rest period TR. The subsequent frame is a pulse 9a generated from the one-shot pulse generation circuit 9.
Since the modulation data D1 given to the driver 4 from the modulation control unit 6 is outputted as the transmission data D2 from the driver 4 to the transmission line 2, the modulation data D1 is outputted after the value becomes "0", and the modulation data D1 is outputted as the transmission data D2 from the driver 4 to the transmission line 2, and is transmitted to the next stage transmission relay device or reaches the transmission device. Figure 4 shows that the subsequent transmission frame
This is the case when the data is sent within R. The subsequent transmission frame is received by the modulation control section 6 by outputting the output permission OP from the relay control section 7 before the pulse 9a generated from the one-shot pulse generation circuit 9 reaches 0. However, the driver 4 has one-sigid pulse output 9a as °“0”°.
Since the driver output permission ○ is enabled by P1 after ○, as in the subsequent transmission frame of sending data D2 in Figure 4, part of the tip of the leading dummy carrier ■ is missing and the data is not transmitted from the driver 4. It is output to path 2. As a result, the demodulation control section suspension period TR of the next-stage transmission relay device or transmission device is ensured. Note that even if a part of the dummy carrier is missing, demodulation is possible in the next-stage transmission relay device or the demodulation control section of the transmission device. Furthermore, the one-shot pulse generation circuit 9 can be constructed from a relatively simple circuit such as a monostable multi-by-break circuit or a counter circuit.

【発明の効果】【Effect of the invention】

この発明によれば、伝送路に送出した伝送フレームの末
尾から一定の期間、後続の伝送フレームを送出すること
を抑制する機能を伝送中継装置に持たせるようにしたの
で、 次段の伝送中継装置、或は伝送装置の復調制御部休止期
間を確保することができ、多数段の伝送中継装置の接続
が可能になる。
According to this invention, since the transmission relay device is provided with a function of suppressing the transmission of subsequent transmission frames for a certain period of time from the end of the transmission frame sent to the transmission path, the transmission relay device of the next stage Alternatively, it is possible to secure a pause period for the demodulation control unit of the transmission device, and it is possible to connect multiple stages of transmission relay devices.

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

第1図は本発明の一実施例としての構成図、第2図は第
1図の出力補正部の構成の実施例を示す図、 第3図、第4図はそれぞれ伝送フレーム間隔が異なる場
合の第2図の動作を示すタイムチャート、第5図は第1
図に対応する従来の構成図、第6図は第5図の動作説明
用のタイムチャートである。
Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a diagram showing an embodiment of the configuration of the output correction section of Fig. 1, and Figs. 3 and 4 are diagrams showing cases in which the transmission frame intervals are different. A time chart showing the operation of Fig. 2, Fig. 5 shows the operation of Fig. 1.
FIG. 6 is a conventional configuration diagram corresponding to the diagram, and FIG. 6 is a time chart for explaining the operation of FIG.

Claims (1)

【特許請求の範囲】 1)一方の伝送路から入力した伝送フレーム中のデータ
を復調し、このデータを再び変調し、かつこの変調デー
タの前後にそれぞれダミーキャリアを付し、新たな伝送
フレームとして他方の伝送路に送出する伝送中継装置に
おいて、 送出した前記伝送フレームの末尾から一定の期間、後続
の伝送フレームを送出することを抑制する手段を備えた
ことを特徴とする伝送中継装置。
[Claims] 1) Demodulating data in a transmission frame input from one transmission path, modulating this data again, and attaching dummy carriers before and after this modulated data, and creating a new transmission frame. 1. A transmission relay device that transmits data to the other transmission path, comprising means for suppressing transmission of subsequent transmission frames for a certain period of time from the end of the transmitted transmission frame.
JP2008033A 1990-01-17 1990-01-17 Transmission repeater Expired - Lifetime JP2542714B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008033A JP2542714B2 (en) 1990-01-17 1990-01-17 Transmission repeater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008033A JP2542714B2 (en) 1990-01-17 1990-01-17 Transmission repeater

Publications (2)

Publication Number Publication Date
JPH03212041A true JPH03212041A (en) 1991-09-17
JP2542714B2 JP2542714B2 (en) 1996-10-09

Family

ID=11682023

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008033A Expired - Lifetime JP2542714B2 (en) 1990-01-17 1990-01-17 Transmission repeater

Country Status (1)

Country Link
JP (1) JP2542714B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6320447A (en) * 1986-07-15 1988-01-28 Nisshin Steel Co Ltd Method and apparatus for continuous coating of metallic strip with ceramics
JPH01231464A (en) * 1987-11-27 1989-09-14 Sony Corp Communication equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6320447A (en) * 1986-07-15 1988-01-28 Nisshin Steel Co Ltd Method and apparatus for continuous coating of metallic strip with ceramics
JPH01231464A (en) * 1987-11-27 1989-09-14 Sony Corp Communication equipment

Also Published As

Publication number Publication date
JP2542714B2 (en) 1996-10-09

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