JPS5875945A - Transmitter - Google Patents
TransmitterInfo
- Publication number
- JPS5875945A JPS5875945A JP56175421A JP17542181A JPS5875945A JP S5875945 A JPS5875945 A JP S5875945A JP 56175421 A JP56175421 A JP 56175421A JP 17542181 A JP17542181 A JP 17542181A JP S5875945 A JPS5875945 A JP S5875945A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- station
- transmitting
- master station
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
- H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
- H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
(1) 発明の技術分野
本発明はオンライン時に伝送信号の検査をする伝送装置
に関する。DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a transmission device that inspects transmission signals when online.
(2)従来技術
一般に遠く離れた現場の状況を制御部へ伝送する伝送シ
ステムには種々の通信方式があり、大別して単方向適化
方式、半二1通伯方式、全二1通伯方式の3方式がある
。なかでも全二重通信方式は、伝送する情報量の多いに
1枳1j分封にては多く採用されている。この全二重通
信方式は送・受信が同時性を持つため、往・復それぞれ
専用の線路を持つている。そこで従来全二重通信システ
ムで事実上半二1通個、つま9送・受信が異時性をもっ
た通信方式を採用している装置では伝送信号の確認チェ
ックを空いているもう一方の伝送線を利用して行なって
いた。すなわち伝送装置の折シ返し試験を行なっていた
。(2) Prior art In general, there are various communication methods for transmission systems that transmit the situation at a remote site to a control unit, and they can be broadly classified into the unidirectional optimization method, the half-21 tohaku method, and the all-21 tohaku method. There are three methods. Among these, the full-duplex communication method is often used in 1-1-1-1-time transmission systems, since the amount of information to be transmitted is large. This full-duplex communication system allows for simultaneous transmission and reception, so it has dedicated lines for both forward and reverse directions. Therefore, in conventional full-duplex communication systems, in fact, in devices that employ a communication method in which transmission and reception are time-dependent, the confirmation check of the transmission signal is performed on the other transmission. It was done using lines. In other words, a repeat test was conducted on the transmission equipment.
以下、この種の全二重通信方式を採用した従来の伝送装
置について第1図を参照、して欧明する。1は親局、2
は子局であって、この親局1から子局2へ信号を伝送す
る伝送線を下シ伝送線、この逆の伝送線を土シ伝送線と
すると、親局1と子局2とは下り伝送線3と土!ll伝
送線4とで連絡されている。そして、観4局1は、子局
2へ送るデータ信号を出力する送信回路5と、この送信
回路5から出力されたデータイh号でキャリア信号に変
調をかけて前記下!ll伝送線3へ被変調キャリア信号
を出力する変?J7j回路6と土シ伝送細4によって子
局2から伝送され/こ被変調キャリア信号を復調する復
調回路7と、この復調回路7の復餅・信号を受信する受
信回路8とを備オ、前記送信回路5の出力と復調回路7
の出力とを変調回路60入力側に配置する切換えスイッ
チ9で選択する構成としている。Hereinafter, a conventional transmission device employing this type of full-duplex communication system will be explained with reference to FIG. 1 is the master station, 2
is a slave station, and if the transmission line that transmits signals from master station 1 to slave station 2 is the lower transmission line, and the reverse transmission line is the lower transmission line, then the master station 1 and slave station 2 are Down transmission line 3 and soil! ll transmission line 4. Then, the station 1 modulates the carrier signal with the transmitting circuit 5 which outputs the data signal to be sent to the slave station 2, and the data signal h output from the transmitting circuit 5. Is it strange to output the modulated carrier signal to the transmission line 3? Equipped with a demodulation circuit 7 for demodulating the modulated carrier signal transmitted from the slave station 2 by the J7j circuit 6 and the local transmission line 4, and a reception circuit 8 for receiving the demodulated signal of the demodulation circuit 7, The output of the transmitting circuit 5 and the demodulating circuit 7
The configuration is such that the output is selected by a changeover switch 9 disposed on the input side of the modulation circuit 60.
一方、子局2 ([1にあっても前記親局1と同様な構
成をとっている。なお、図中、IQは徐訓1回路、11
は受信回路、12は送信回路、13は変調回路、14は
切換えスイッチである。On the other hand, slave station 2 ([1) also has the same configuration as the master station 1. In the figure, IQ is Xukun 1 circuit, 11
12 is a receiving circuit, 12 is a transmitting circuit, 13 is a modulation circuit, and 14 is a changeover switch.
以上のように構成した装@において十二蓮通信方式で親
局lから子局2へ信号を伝送する場合、切換えスイッチ
9.14は送信回l11i!i5および12へそれぞれ
切徊えられている。この状態で送信回路5からのデータ
信号は変調回路6によって被変調キャリア信号に変えら
れ下り伝送線3f:介して子局2の復調回路10へ伝送
される。この復調回路10にてデータ信号に復調され受
信回路11へ入力される。次に子局2がら親局1への伝
送は切換えスイッチ7.14はそのままの状態で前記の
親局lと子局2とが逆の立場となって今腿は上り伝送線
4を介して前記と同様の伝送が行なわれる。When transmitting a signal from the master station l to the slave station 2 using the twelve lotus communication method in the device configured as described above, the changeover switch 9.14 is set to the transmission circuit l11i! i5 and 12 respectively. In this state, the data signal from the transmission circuit 5 is converted into a modulated carrier signal by the modulation circuit 6 and transmitted to the demodulation circuit 10 of the slave station 2 via the downlink transmission line 3f. The demodulation circuit 10 demodulates the signal into a data signal and inputs it to the reception circuit 11. Next, transmission from the slave station 2 to the master station 1 is carried out via the upstream transmission line 4, with the changeover switch 7.14 left as is, and the master station 1 and slave station 2 are in reverse positions. A transmission similar to that described above takes place.
次に、この伝送装置、の折り返し試験を行なう場合、子
局2の切換えスイッチ14のみを送信回路12の出力側
から復酔」回路10の出力側」へ切換える。そうして親
局1の送信回路5よυデータ信号を出力すると、変調回
路6→下シ伝送線3→復調回路10→切換えスィッチ1
4→変調回路13→土シ伝送線4→復調回路8→受信回
路9の信号経路によって親局1の受信回路9に前記送信
回路5によって出力されたデータ信号が受信される。Next, when conducting a return test of this transmission device, only the changeover switch 14 of the slave station 2 is switched from the output side of the transmitting circuit 12 to the output side of the "recovery" circuit 10. Then, when the transmission circuit 5 of the master station 1 outputs the υ data signal, the modulation circuit 6 → lower transmission line 3 → demodulation circuit 10 → changeover switch 1
The data signal outputted by the transmitting circuit 5 is received by the receiving circuit 9 of the master station 1 through a signal path of 4→modulation circuit 13→transmission line 4→demodulating circuit 8→receiving circuit 9.
(3)従来技術の問題点
上記構成の信号伝送装置にあっては、折シ返し試験に際
し、子局2の切換えスイッチ14の操作を手動にて行な
う力)、あるいは折9返し試験時に特定の/fイロット
信9(例えば伝送信号形態が周波数偏移変調方式の場合
はトーン信号)を送り、この信号によって子局2の切換
えスイッチ14を切換えて行なうようにしている。しか
しながら、手動切換えにては、システムが通當運転をし
ている時、すなわちメンライン時での試験は全く出来な
い。つ″!、シ折シ返し試験が局留の時期に行なえない
欠点が櫓る。また、自動切換えを行なう方体にては、特
定のパイロット信号を出力する出力回路やその信号な受
信する受信回路を設けるなど回路構成の簡素化の点で欠
点がおる。(3) Problems with the Prior Art In the signal transmission device with the above configuration, it is difficult to manually operate the changeover switch 14 of the slave station 2 during a return test, or when a specific force is applied during a return test. A /f pilot signal 9 (for example, a tone signal when the transmission signal format is a frequency shift keying system) is sent, and the changeover switch 14 of the slave station 2 is switched by this signal. However, manual switching does not allow testing at all when the system is in regular operation, that is, at main line. One drawback is that the return test cannot be carried out during the local station period.In addition, in square systems that perform automatic switching, the output circuit that outputs a specific pilot signal and the receiver that receives that signal are important. There is a drawback in terms of simplification of the circuit configuration, such as the provision of a circuit.
(4)発明の目的
本発明はオンライン時に特定のパイロット佃5−
号を付加することなく、信号の伝送と折シ返し試験とが
常に同時性をもって行なえる伝送装置(5) 発明の
を誉
本発明は親局と子局の間で全二重適化可能な半二重通信
を行なう伝送装置において、復調回路からキャリア検出
信号を堆り出し、送信回路から送信中か否かを示す送信
中信号を取り出し、これら両信号の条件によってスイッ
チの切換え動作を行ない相手局から送られたデータ信号
を再び相手局へ送シ返すことによシ相千局において送っ
たデータ信号と送シ返されたデータ信号を比較して折シ
返し試験を行なうことにより、上記目的を達成するもの
である。(4) Purpose of the Invention The present invention provides a transmission device that can always perform signal transmission and return testing simultaneously without adding a specific pilot number when online. The invention relates to a transmission device that performs half-duplex communication capable of full-duplex optimization between a master station and a slave station, in which a carrier detection signal is output from a demodulation circuit, and a carrier detection signal is output from a transmission circuit to indicate whether or not transmission is in progress. The signal is taken out and the switch is changed according to the conditions of these two signals, and the data signal sent from the other station is sent back to the other station again. The above object is achieved by comparing data signals and performing a foldback test.
(6) 発明の実施例
第2図に本発明の実施例を示す。2oは親局、21は子
局であ)、両局20.21間は下シ伝送線22と士シ伝
送線23とで連絡されている。(6) Embodiment of the invention FIG. 2 shows an embodiment of the invention. 2o is a master station, 21 is a slave station), and both stations 20 and 21 are connected by a lower transmission line 22 and a lower transmission line 23.
ここに親局20は次のように構成されている。The master station 20 is configured as follows.
24は子局21へ送るデータ信号および送信中6−
信号を出力する送信回路で、この送(m回路24にはデ
ータ信号によってキャリア信号に変調をかけ前記下り伝
送1;H2へ被変調キャリア信号を出力する変調回路2
5が切換スイッチ26を介して接続されている。また2
7は前記上り伝送線23によって子局21から伝送され
た被変調キャリア信号を復調する復調回路で、この復調
回路27に1同復調回路270後訳l伯号を受信する受
信回路28が接続されている。さらにこの受信回路28
と前記送信回路24との間には両者の送信データおよび
受信データを比較するデータ比較回路29が接続されて
いる。また前記切換えスイッチ26によって前記復調回
路27の出力側j、あるいは前記送信回路24の出力側
が前記変調回路25の入力側に切換え接続されるように
なっている。さらに、前記復調回路27および送信回路
24よシ、復ル^1回路27のキャリア検出信号ををシ
出すキャリア検出信号ライン30および送信回路24の
送信中の状態を示す信号を取シ出す送信中信号ライン3
1がそれぞれ設けられ、この両ライン30’、 31に
はAND回路32の入力端がそれぞれ接続されている。24 is a transmitting circuit that outputs a data signal to be sent to the slave station 21 and a transmitting signal. Modulation circuit 2 that outputs
5 are connected via a changeover switch 26. Also 2
7 is a demodulation circuit for demodulating the modulated carrier signal transmitted from the slave station 21 through the upstream transmission line 23, and a receiving circuit 28 for receiving the demodulation circuit 270 is connected to this demodulation circuit 27. ing. Furthermore, this receiving circuit 28
A data comparison circuit 29 is connected between the transmitting circuit 24 and the transmitting circuit 24 to compare the transmitted data and received data of both. Further, the output side j of the demodulation circuit 27 or the output side of the transmission circuit 24 is selectively connected to the input side of the modulation circuit 25 by the changeover switch 26. Further, the demodulating circuit 27 and the transmitting circuit 24 output the carrier detection signal of the demodulation circuit 27 and the carrier detection signal line 30 which outputs the carrier detection signal of the transmitting circuit 27 and outputs a signal indicating the transmitting status of the transmitting circuit 24. signal line 3
1 are respectively provided, and the input terminals of an AND circuit 32 are connected to both lines 30' and 31, respectively.
なお送信中信号ライン3)側の入力端は反転端となって
いる。そしてこのAND回路32の出力によって前記切
換えスイッチ26は切換え動作を行なうようになってい
る。Note that the input end on the transmitting signal line 3) side is an inverted end. The output of the AND circuit 32 causes the changeover switch 26 to perform a switching operation.
次に子局21の構成は以下のようになっている。33は
前記下シ伝送線22によって親局20力・ら伝送されf
c被変調キャリア信号を復調する復調回路で、この復調
回路33には同復調回路33の後調信号を受信する受信
回路34が接続されている。また、35は子局2ノから
親局2oへ送るデータ信号を出力する送信回路でこの送
信回路35にはデータ信号によってキャリア信号に変調
をかけ、前記上り伝送線23へ被変調キャリア信号を出
力する変調回路36が切換えスイッチ37を介して接続
されている。Next, the configuration of the slave station 21 is as follows. 33 is transmitted from the master station 20 by the lower transmission line 22.
c A demodulation circuit that demodulates the modulated carrier signal, and a receiving circuit 34 that receives the post-modulated signal of the demodulation circuit 33 is connected to this demodulation circuit 33 . Further, 35 is a transmitting circuit that outputs a data signal to be sent from the slave station 2 to the master station 2o, and this transmitting circuit 35 modulates a carrier signal with the data signal and outputs a modulated carrier signal to the upstream transmission line 23. A modulation circuit 36 is connected via a changeover switch 37.
またこの切換えスイッチ37によって前記復調回路33
の出力側、あるいは前記送信回路35の出力側が前記変
調回路36の入力4JAllに切換え接続されるように
なっている。さらに前記復調回路33および送信回路3
5よシ、復ル旧01路33のキャリア検出信号を取り出
すキャリア検出信号ライン38および送信回路35の送
信中の秋i1を示す信号を取υ出ず送信中信号ライン3
9が設けられ、この両ライン3 B 、 、99にはA
ND回路回路4人0
る。なお送信中信号ライン390入力端は反転端となっ
ている。そしてこのAND回路4oの出力によって前記
切換えスイッチ37は切換え動作を行なうようになって
いる。さらに前記受信回路34と前記送信回路35との
間には両者の送信データおよび受信データを比較するデ
ータ比較回路4ノが接続されていイ)。Also, this changeover switch 37 allows the demodulation circuit 33 to
or the output side of the transmitting circuit 35 is selectively connected to the input 4JAll of the modulating circuit 36. Furthermore, the demodulation circuit 33 and the transmission circuit 3
5, the carrier detection signal line 38 which takes out the carrier detection signal of the old 01 path 33 and the signal indicating the fall i1 during transmission of the transmission circuit 35 are not taken out and the signal line 3 which is being transmitted is
9 is provided, and both lines 3B, , 99 have A
ND circuit circuit 4 people 0 Ru. Note that the input end of the transmitting signal line 390 is an inverted end. The changeover switch 37 performs a switching operation based on the output of the AND circuit 4o. Furthermore, a data comparison circuit 4 is connected between the receiving circuit 34 and the transmitting circuit 35 to compare the transmitted data and received data of both.
次に、以上のように構成される装置の作用を説明すると
、まず、親局20と子局21との間で半二重通信方式で
通常のデータ信号の送信、受@を行なう場合は、親局2
0の切換スイッチ26は送信回路24側へ、子局2ノの
切撓えスイッチ37は送信回路35側へそれぞれ切換え
9−
られだ状態で前記第1図の従来装置と同様に行なわれる
。次に折シ返し試験を行なう場合、親局20の送信回路
24からデータ信号が切換えスイッチ26を介して変調
回路25へ入力される。この変調回路25にて伝送用の
キャリア信号にデータ信号の変調が〃・けられ、この被
変調キャリア信号が下シ伝送g122を介して子局21
の復調回路33に入力される。この復調回路33にて復
調信号が受信回路34へ出力されると同時にキャリア検
出信号がキャリア検出信号ライン38へ出力される。そ
してこのキャリア検出信号はAND回路40の入力端へ
”H”レベルの信号として入力される。一方、送信回路
35からは、半二重通信方式をとっているので子局21
は送信状態でないから、送信中信号が出力されない。し
たがってAND回路40の反転入力端に“L#レベルの
信号が入力されるので同AND回路40への直接入力信
号は°H”レベルとなる。すなわちこの“H”レベル信
号と前記キャリア検出信号の”H”レベル信号とによっ
てAND10−
回路40は”H”レベルの信号を出力する。この°H″
ルベル出力によって前記切換スイッチ37は送信回路3
5の出力側から復調回路33の出力側へ自動的に切り換
えられる。そうすると、復調回路33の復調信号は受信
回路34へ入力されると同時に変調回路36へも入力さ
れる。Next, to explain the operation of the device configured as above, first, when transmitting and receiving normal data signals between the master station 20 and the slave station 21 using the half-duplex communication method, Master station 2
The switching switch 26 of the slave station 2 is switched to the transmitting circuit 24 side, and the switching switch 37 of the slave station 2 is switched to the transmitting circuit 35 side, in the same manner as in the conventional device shown in FIG. Next, when performing a return test, a data signal is input from the transmitting circuit 24 of the master station 20 to the modulating circuit 25 via the changeover switch 26. This modulation circuit 25 modulates the data signal into a carrier signal for transmission, and this modulated carrier signal is transmitted to the slave station 21 via the lower transmission g122.
The signal is input to the demodulation circuit 33 of. The demodulation circuit 33 outputs the demodulated signal to the reception circuit 34 and at the same time outputs the carrier detection signal to the carrier detection signal line 38. This carrier detection signal is then input to the input terminal of the AND circuit 40 as an "H" level signal. On the other hand, since the transmission circuit 35 uses a half-duplex communication method, the slave station 21
is not in the transmitting state, so no transmitting signal is output. Therefore, since a signal of "L# level" is input to the inverting input terminal of the AND circuit 40, the direct input signal to the AND circuit 40 becomes "H" level. That is, based on this "H" level signal and the "H" level signal of the carrier detection signal, the AND10-circuit 40 outputs a "H" level signal. This °H″
The changeover switch 37 is switched to the transmission circuit 3 by the level output.
5 to the output side of the demodulation circuit 33. Then, the demodulated signal of the demodulation circuit 33 is inputted to the receiving circuit 34 and simultaneously inputted to the modulation circuit 36.
この変調回路36にてキャリア信号に情調信号によって
変調がかけられ、この被変訓1キャリア信号は前記上り
伝送線23を介して親局20の復調」回路27へ入力さ
れる。この復調1回路27にて復経】され、この復調信
号は、受信回路28へ入力されると同時に、キャリア検
出信号がキャリア検出信号ライン30へ出力される。そ
してこのキャリア検出信号はAND回路32の入力端へ
”H”レベルの信号として入力される。一方送倍回路2
4からは送信中信号が送信中信号ライン31を介してA
ND回路回路3艮0
てAND回路32の面接入力としては°L”レベルとな
る。つまりこの”L”レベルの信号と前記キャリア検出
信号の°゛H″H″レベルによってAND回路32は”
L′″レベルの信号を出力する。The modulation circuit 36 modulates the carrier signal with the modulation signal, and the modulated one carrier signal is input to the demodulation circuit 27 of the master station 20 via the upstream transmission line 23. This demodulated signal is demodulated by the demodulation 1 circuit 27, and the demodulated signal is input to the receiving circuit 28, and at the same time, the carrier detection signal is output to the carrier detection signal line 30. This carrier detection signal is then input to the input terminal of the AND circuit 32 as an "H" level signal. On the other hand, magnification circuit 2
4, the transmitting signal is sent to A via the transmitting signal line 31.
ND circuit circuit 3 = 0, and the interview input of AND circuit 32 becomes °L" level. In other words, this "L" level signal and the carrier detection signal's °H"H" level cause AND circuit 32 to
Outputs an L''' level signal.
この”r7″ルベルの信号では前記切換えスイッチ26
は動作しないでそのま1の秋態を保つ。In this "r7" level signal, the changeover switch 26
does not operate and remains in the same autumn state.
また前記受信回路28へ入力された復調信号は前記デー
タ比較回路29によって送信回路24の送信データと比
較され折り返しのデータ信号が合っているかの検査が為
される。この時送信回路24からデータ比較回路29に
出力される送信データは伝送の折り返しに要する時間を
考慮して、伝送時間分の遅れ時間を持っている。Further, the demodulated signal input to the receiving circuit 28 is compared with the transmitted data from the transmitting circuit 24 by the data comparing circuit 29 to check whether the returned data signals match. At this time, the transmission data outputted from the transmission circuit 24 to the data comparison circuit 29 has a delay time equal to the transmission time, taking into account the time required for transmission turnaround.
また、子局21から親局20への折り返し試tii行な
う場合は切換えスイッチ26と37が逆の位置となるこ
とと、データ比較がデータ比較回路41で行なわれると
いうことだけで、上記と同様の作用で行なわれる。Furthermore, when performing a loopback test from the slave station 21 to the master station 20, the same operation as above is performed, only that the changeover switches 26 and 37 are in opposite positions, and the data comparison circuit 41 performs the data comparison. It is done by action.
以上、上記実施例においては、親局20からはかりでは
なく必要によっては子局21からの折り返し試験も可能
となる。また、通常伝送されるデータ信号は信号ライン
の数の関係士シリアル信号形態をとっており、このデー
タ信号を受信回路にてパラレル信号形態に変換などして
後方(図に示していない)の電子言1算機等で折シ返し
データの検査を行なっていkが、上記実施例にてはデー
タ比較回路29捷た4ノによってシリアル化号形態のま
まで検査が出来る。As described above, in the above-mentioned embodiment, it is possible to conduct a return test not from the master station 20 but also from the slave station 21 if necessary. In addition, the data signal that is normally transmitted is in the form of a serial signal connected to the number of signal lines, and this data signal is converted into a parallel signal form in the receiving circuit and sent to the downstream electronic device (not shown in the figure). However, in the above embodiment, the data comparison circuit 29 can be used to check the returned data in serialized code form.
なお、本発明は上記実施例に限定されることはなくその
要旨を逸脱しない限シ種々変形して実施出来るものであ
る。It should be noted that the present invention is not limited to the above embodiments, and can be implemented with various modifications without departing from the gist thereof.
(7) 発明の効釆
本発明によって、全二重通信システムにおける半二重通
信を行なう伝送装置において、変1.寸回路、復調回路
および伝送線の折シ返し試験をスイッチ切換え用の特定
の・ぐイロット信号を設けることなく、シたがって簡単
f!栴成でスイッチの自動切換えを行なえる。また自動
切換えが可能になることによって折り返し試験がオンラ
イン時にデータ伝送と同時性をもって行なうことが出来
る。すなわち簡単な構成でオンライン13一
時、オフライン時にかかわらず折9返し試験を可能にし
た伝送装置を提供出来る。(7) Effects of the Invention According to the present invention, in a transmission device that performs half-duplex communication in a full-duplex communication system, changes 1. Therefore, it is easy to perform foldback tests on digital circuits, demodulation circuits, and transmission lines without the need for special pilot signals for switching switches. Automatic switching of switches can be performed with Sensei. Furthermore, by enabling automatic switching, loopback tests can be performed online simultaneously with data transmission. That is, it is possible to provide a transmission device with a simple configuration that enables repeat testing regardless of whether it is online or offline.
第1図は従来の伝送装置の構成図、第2図は本発明に係
わる伝送装置の一実施例の構成図を示すものである。
20・・・親局、21・・・子局、29.41・・・デ
ータ比較回路、32.40・・・1人力反転形AND回
路、30 、38・・・キャリア検出信号ライン、31
、39・°°送信中信号ライン。
出願人代理人 弁理士 鈴 江 武 彦14−FIG. 1 is a block diagram of a conventional transmission device, and FIG. 2 is a block diagram of an embodiment of a transmission device according to the present invention. 20... Master station, 21... Slave station, 29.41... Data comparison circuit, 32.40... 1 manual inversion type AND circuit, 30, 38... Carrier detection signal line, 31
, 39·°° Transmitting signal line. Applicant's agent Patent attorney Takehiko Suzue 14-
Claims (1)
装置において、前記親局と子局はそれぞれ相手局から送
られてくる被変調キャリア信号を復調回路で復調してキ
ャリア検出信号を取シ出しキャリア検出信号ラインに送
出する第1の手段と、相手局へデータを送信する送信回
路から送信中の信号を取シ出して送信中信号ラインに送
出する第2の手段と、前記両ラインの信号の育・無によ
って切換え動作を行ない前記送信回路の出力および前記
復調回路の出力のいずれか一方を変調回路の入力として
選択する切換えスイッチと、前記送信回路の送信データ
と前記復調回路を介して受信回路で受信したデータとを
比較するデータ比較回路とを備え、親局と子局の間で折
シ返し試*V常時行なうことを特徴とした伝送装置。In a half-duplex communication transmission device capable of full-duplex communication between a master station and a slave station, each of the master station and slave station demodulates a modulated carrier signal sent from the other station using a demodulation circuit. A first means for extracting a carrier detection signal and sending it to the carrier detection signal line; and a second means for extracting a signal being transmitted from a transmitting circuit that transmits data to a partner station and sending it to the transmitting signal line. and a changeover switch that performs a switching operation depending on whether the signals on the two lines are active or not, and selects either the output of the transmitting circuit or the output of the demodulating circuit as an input to the modulating circuit, and the transmitting data of the transmitting circuit. A transmission device comprising a data comparison circuit that compares data received by a reception circuit via the demodulation circuit, and constantly performs a call-back test between a master station and a slave station.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56175421A JPS5875945A (en) | 1981-10-31 | 1981-10-31 | Transmitter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56175421A JPS5875945A (en) | 1981-10-31 | 1981-10-31 | Transmitter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5875945A true JPS5875945A (en) | 1983-05-07 |
Family
ID=15995797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56175421A Pending JPS5875945A (en) | 1981-10-31 | 1981-10-31 | Transmitter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5875945A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5408466A (en) * | 1984-12-06 | 1995-04-18 | Motorola, Inc. | Duplex interconnect dispatch trunked radio |
-
1981
- 1981-10-31 JP JP56175421A patent/JPS5875945A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5408466A (en) * | 1984-12-06 | 1995-04-18 | Motorola, Inc. | Duplex interconnect dispatch trunked radio |
US5544159A (en) * | 1984-12-06 | 1996-08-06 | Motorola, Inc. | Duplex interconnect/dispatch trunked radio |
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