JPS5854757A

JPS5854757A - Collision detecting system

Info

Publication number: JPS5854757A
Application number: JP56151972A
Authority: JP
Inventors: Shohei Sugawara; 菅原　昌平; Akihiro Takagi; 高木　明啓; Shinichi Yamada; 伸一山田
Original assignee: Nippon Telegraph and Telephone Corp
Current assignee: Nippon Telegraph and Telephone Corp
Priority date: 1981-09-28
Filing date: 1981-09-28
Publication date: 1983-03-31

Abstract

PURPOSE:To simplify a detection system, by discriminating a signal received during transmission as the generation of collision, through the constitution of a transmission line and a coupler so as not to receive the transmission signal of nodes of the system itself by reception circuits of the nodes. CONSTITUTION:Terminators 3-1, 3-2 are connected to both ends of an optical fiber transmission line 1 and couplers 2-1, 2-2, 2-3 connected respectively to nodes 4-1, 4-2, 4-3 are arranged between the terminators. Each coupler 2 is connected with a waveguide 6-1 receiving signals from the left of transmission lines 5-1, 5-2 and transmitting signals to left and a waveguide 6-2 receiving from the right and transmitting to the right. In inputting signals to the waveguide 6-1, the signal is transmitted left to the line 5-1 and in inputting to the waveguide 6-2 conversely, the signal is transmitted to the line 5-2. The reception of the transmission signal of nodes of the system itself is prevented at the reception circuits of the nodes and when signals are received during the transmission, it is discriminated as the generation of collision to simplify the detection of collision.

Description

【発明の詳細な説明】本発明はローカル・ネノ［・ワークに接続された複数ツ
ノ−ド（プｒ」セノザ及び端末機器等から構成さ〕１．
る）が−Ｊ１記ローカル・ネットワークに信号　１− を同時に送出する場合に生じる衝突を検出する方式に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a local node system (consisting of a plurality of nodes connected to a local network, terminal equipment, etc.)1.
The present invention relates to a method for detecting collisions that occur when signals 1- and 1) are simultaneously sent to the local network -J1.

従来、この種のｌｌ’ｌ−カル・ネットワークでは、各
ノー１・が送出（〜た信４ルが自らの受信回路にも人っ
て来るため、伯Ｖしの衝突の倹１１旨ｒ１送イＮ信＋Ｊ
と受１ｄ信号を比較１〜不一致を検出する万民で行わ）
１ていたが、この方式でＶＪ検出４′ｈ度が低く、ｌｔ
　ｉｌＲ回路等も必要で権ＡイＩな衝突検出機構が必便
となる欠点があっ／こ。Conventionally, in this type of ll'l-cal network, each node sends out (~4) signals to its own receiving circuit, so that the 11 effect of r1 transmission is reduced due to the collision between the two. iN Shin+J
Compare the received 1d signal with 1 to detect a discrepancy (performed by Manmin)
1, but with this method, the VJ detection 4'h degree was low, and it was
There is a drawback that an ilR circuit etc. is also required and a collision detection mechanism with proper AI is indispensable.

本発明（弓とｈらの欠点を除去するために、スイバを行
う）−１・に、Ｉ、−いて、自ノードび）Ｊ木ｆｉｉ付
ｉ号が自ノー１の受４Ｍ回路に」６って受信さＪＩない
」、う伝送路、結合装置を構成することに、１す、送イ
１、中（・′（何らかの信号を受的−Ｊ−７１ば雨突発
／１〕判断可能と１〜、検出機１１４０簡１１化？ａ−
ｆ＋Ｊ、かったものて、以−１図面について説明する。The present invention (to remove the drawbacks of the bow and h et al., perform the swivel) It is possible to determine that there is no signal being received, and that it is possible to configure the transmission line and coupling device. 1~, Detector 1140 simplified 11?a-
f+J, Katamonote, and the following drawings will be explained.

オ］図は］本の尤ノｌイバ伝必路を用い／こ本発明の実
施例−〇あって、１（１、尤ファイバ伝Ｉ′！、路、２
−１〜２−３１４結合装置、３−１　、　　：ｌ−２ｉ
１終端装置、４−１〜４−３　ｉ＝、１）−１・゛であ
る。第２図ｄ結合２− 部分の拡大図であり、２ｄ光分岐集線装置、５−１゜５
−２は伝送路、６１．６−２は１信号送受信用導波路で
ある。導波路６−１へ信号を入力すると向って左側へ信
号は伝達され、伝送路５−１へ送り出される。逆に導波
路６−２へ信号を入力すると右方向へ伝達され、伝送路
５−２へ送り出される。E] The diagram uses the book's special fiber transmission route / This is an embodiment of the present invention -
-1~2-314 Coupling device, 3-1, :l-2i
1 terminal device, 4-1 to 4-3 i=,1)-1·゛. Figure 2 d is an enlarged view of the 2- portion of the 2-d optical branch concentrator, 5-1°5
-2 is a transmission line, and 61.6-2 is a waveguide for transmitting and receiving one signal. When a signal is input to the waveguide 6-1, the signal is transmitted to the left side and sent out to the transmission path 5-1. Conversely, when a signal is input to the waveguide 6-2, it is transmitted to the right and sent out to the transmission path 5-2.

したがって、導波路６−１へ入力した信号が導波路６−
２から検出されるととはなく、導波路６−２へ入力した
信号が導波路６−１から検出されることはない。Therefore, the signal input to the waveguide 6-1 is transmitted to the waveguide 6-1.
The signal input to the waveguide 6-2 is not detected from the waveguide 6-1.

このようにすると、信号送出中に、自ノードで送信した
信号を受信することはない。ノー１−’４−］が送信中
にノード４−２が送信を始めて衝突が起ると、ノード４
−１，４ｆ２ばそれぞえし相手ノートの信号を受信する
。よって送信中に信号を受信するたけて衝突が検出でき
る。In this way, the signal transmitted by the own node will not be received while the signal is being transmitted. If node 4-2 starts transmitting while node 1-'4-] is transmitting and a collision occurs, node 4
-1 and 4f2 respectively receive the signal of the other party's note. Therefore, a collision can be detected as soon as a signal is received during transmission.

第３図は結合部分の別の実施例で送信、受信者々別々の
導波路を用いたものである。５−１．５−２は伝送路、
７−１は向って左方向（５−１方向）からの受信用導波
路、７−２は向って右方向（５２方向）からの受信用導
波路、８−１（（ｊ向って右方向（５−２方向）への送
信用導波路、８−２（（ｊ、向って左方向（５−１方向
）′＼の送信用導波路である。FIG. 3 shows another embodiment of the coupling section, in which separate waveguides are used for transmitter and receiver. 5-1.5-2 is a transmission line,
7-1 is a receiving waveguide from the left direction (5-1 direction), 7-2 is a receiving waveguide from the right direction (52 direction), and 8-1 ((j is from the right direction). (5-2 direction), 8-2 ((j, left direction (5-1 direction) '\ transmission waveguide.

送信用導波路８〜１から入力した信号は伝送路５−２へ
伝達されるため受信用導波路７−１から受信されること
はない。送信用導波路８−２から入力した信号に、伝送
路５〜１へ伝達されるため受信用導波路７−２から受信
されること１、ない。よって、この場合も−Ｆ述の衝突
検出が可能である。The signals inputted from the transmission waveguides 8-1 are transmitted to the transmission path 5-2, and therefore are not received from the reception waveguide 7-1. Since the signal inputted from the transmission waveguide 8-2 is transmitted to the transmission lines 5-1, it is not received from the reception waveguide 7-2. Therefore, in this case as well, the collision detection described in -F is possible.

牙４図は右方向・左方同各々独ｅ１−な光ファイノく伝
送路を用いた本発明の別の実施例である。】−１゜１−
２は光フアイバ伝送路、９−１〜！ｌ　−３ｉＪ結合装
置、３−１〜：う−４は終端装置、４−１〜４−；うは
ノードである。牙５図は結合部分の拡大図であって、図
の上側が伝送路１−１に接続する結合部分、下側が伝送
路］−２に接続する部分である。伝送路］−１は向って
右側へ伝搬する信号のみに用いる伝送路、伝送路］−２
１向って左側へ伝搬する信号のみに用いる伝送路、７〜
１は面って左側からの１８号の受信用導波路、７−２１
向って右側からの信号の受信用導波路、８−１は向って
右側への送信用導波路、８−２−向って左１１１］１へ
の送信用導波路である。牙３図の例と同様、送信用導波
路８−］から入力した信号が受信用導波路７−１から受
信されることｄなく、送信用導波路８−２から入力した
信号が受信用導波路７−２から受信されることはないた
め、自ノートの送信信号を自ノードで検出することはな
く、上述の衝突検出が可能である。牙６図は第２図に示
した結合装置の高分子光導波路を用いた具体的な実施例
を示す。２０は結合装置の筐体である。５−１．５−２
ｉ光フアイバを用いた伝送路、６−１．６−２．　Ｉ　
Ｏ−］、　１０−２．１１−］、　＋１−２．１２−１
．１２−２゜３３−１・１３−２は高分子光導波路、１
４−１＋　］４−２　Ｎ光送信装置でし〜ザ・ダイオー
ド又は発光ダイオードを用いる。１５−１，１５２は光
受信装置でフォト・　・ダイオードを用いる。１６−１
．１６２．１７１．１７２　ｉｊ、ノードとの接続ケー
ブル、１８−１〜１８−４は結合装置と接続ケーブルの
接続装置、１’！１−］、　１９−２は結合装置と伝送
路の接続装置である。ノードから関部へ送信する信号は
電気信号としてケーブル１６］。FIG. 4 shows another embodiment of the present invention using optical fiber transmission lines in the right direction and the left direction, respectively. ]-1゜1-
2 is an optical fiber transmission line, 9-1~! l-3iJ coupling devices, 3-1~:U-4 is a terminal device, 4-1~4-;U is a node. Figure 5 is an enlarged view of the coupling part, where the upper side of the figure is the coupling part connected to the transmission line 1-1, and the lower side is the part connected to the transmission line 1-2. Transmission line]-1 is a transmission line used only for signals propagating to the right side; transmission line]-2
1 Transmission line used only for signals propagating to the left, 7-
1 is the receiving waveguide of No. 18 from the left side when facing, 7-21
8-1 is a waveguide for receiving signals from the right side, 8-1 is a waveguide for transmitting signals to the right side, and 8-2 is a waveguide for transmitting signals to the left side 111]1. Similar to the example in Figure 3, the signal input from the transmission waveguide 8-2 is not received from the reception waveguide 7-1, and the signal input from the transmission waveguide 8-2 is received from the reception waveguide 7-1. Since it is not received from the wave path 7-2, the transmission signal of the own node is not detected by the own node, and the above-mentioned collision detection is possible. FIG. 6 shows a specific embodiment of the coupling device shown in FIG. 2 using a polymer optical waveguide. 20 is a housing of the coupling device. 5-1.5-2
Transmission line using i-optical fiber, 6-1.6-2. I
O-], 10-2.11-], +1-2.12-1
．． 12-2゜33-1 and 13-2 are polymer optical waveguides, 1
4-1+ ]4-2 N optical transmitter uses a diode or a light emitting diode. 15-1 and 152 are optical receivers that use photodiodes. 16-1
．． 162.171.172 ij, connection cable with the node, 18-1 to 18-4, connection device between the coupling device and the connection cable, 1'! 1-] and 19-2 are coupling devices and transmission line connection devices. The signal transmitted from the node to the Sekibe is an electrical signal via cable 16].

　５− １６−２によって光送信器１４−Ｌ目−２に伝えられ、
光信号が送信用導波路］０−１．１０−２へ出力される
。5- transmitted to optical transmitter 14-L-2 by 16-2,
The optical signal is output to the transmission waveguide ]0-1.10-2.

出力された光信号に送信用導波路］　（１−１，］　０
−２　から各々導波路６−１，６−２経由で分岐東線用
導波路１２−２．１２−１へ伝えらね、伝送路５−２．
５−］へ出力される。即ち、光送信器１４−１は向って
右方向への送信、光送信器１４−２は向って左方向への
送信を行う。一方、受信装置Ｊ５Ｌ］５２ｉ’ｌＪ、各
々伝送路５−］、５−２から導波路１２−１．１２−２
を経由して受信用導波路＋１−１．　］］−２へ入った
信号を検出し電気信号と（−て接続ケーブル１７−１．
１７−２へ送出する。したがって、光送信装置１４−１
が送信した信号を光受信装置１５−１が受信すること、
及び光送信装置１４−２が送信した信号を光受信装置１
５−２が受信することはなく、先に述べた衝突検出機構
が利用可能である。Transmission waveguide for the output optical signal] (1-1,] 0
-2 to branch east line waveguides 12-2, 12-1 via waveguides 6-1 and 6-2, respectively, and transmission lines 5-2 to 12-1.
5-]. That is, the optical transmitter 14-1 transmits to the right, and the optical transmitter 14-2 transmits to the left. On the other hand, the receiving device J5L]52i'lJ, each transmission line 5-], 5-2 to waveguide 12-1.12-2
via the receiving waveguide +1-1. ]]-2 is detected and the electric signal (- is connected to the connecting cable 17-1.
17-2. Therefore, the optical transmitter 14-1
The optical receiving device 15-1 receives the signal transmitted by the
and the signal transmitted by the optical transmitter 14-2 to the optical receiver 1.
5-2 is not received, and the collision detection mechanism described above can be used.

以上説明したように、伝ＩＡ路及び結合装置のもつ信号
伝搬の方向ｔ１を利用することにより、自ノードの送信
信号を受信１〜ない接続が可能となり、送信中の受信の
４１無により衝突が検出できるだめ、６一衝突検出装置が簡単な構成で実現できる。As explained above, by using the signal propagation direction t1 of the IA path and the coupling device, it becomes possible to establish a connection where the transmission signal of the own node is not received. If it can be detected, a 6-collision detection device can be realized with a simple configuration.

[Brief explanation of drawings]

第１図ｄ本発明の一実施例の概略図、第２図ｆＪ、第１
図の結合装置２の部分の拡大図、第３図は牙２図の別の
実施例、第４図は本発明の別の実施例の概略図、第５図
は第４図の結合装置９の部分の拡大図、第６図は第２図
の具体的な実施例である。］、　］−］、　、１−２−一・光フアイバ伝送路、２
−］、　２−２．２−３　　・−・−・結合装置、　３
〜１．３−２゜３−３．３−４　−・−・・終端装置、
　４−１．４−２．４−３・・・・・・ノード、　５−
１．５−２　　　・・・・伝送路、６−１　・・・・・
・・左方向から受信ｌ−１左方向へ送信する導波路、　
６−２　−　・・・右方向から受信し、右方向へ送信す
る導波路、　７−１　・・・・・・・左方向からの受信
用導波路、　７−２・・・・・　右方向からの受信用導
波路、　８−１　　　・・・右方向への送信用導波路、
８−２パ・・・・　左方向への送信用導波路、　！１ｌ
−１．！ｌ−２．９−３−・・・・結合装置、　１０−
１　　・・・−・・右方向への送信用導波路、　１ｏ−
２・・・・左方向への送信用導波路、　】１−１・・・
・・・左方向からの受信用導波路、１］−２・　右方向
からの受信用導波路、１２−１．１２−２　　・　・分
岐集線を行う導波路、１３−１．１３−２　　・・・光
ファイバと導波路の結合部、１４−１．１４−２・・・
・・・光送信装置、　１５−１．］５−２　　・・・・
光受信装置、　］（ｉ　］、　１６２　　・・・・・・
受信信号用接続ケーブル、　１７−１．　］？−２−−
・・・・送イｉ信号用接続ケーブル、　　１８−１〜１
８−４　−・・・・結合装置と接続ケーブルどの接続装
置、　］　９−１．　］　’ｌ−２・・・・　結合装置
と伝送路との接続装置、　２０　・・・・　結合装置の
筐体。特許出願人　日本電信電話公社・１゛・１″ニー　・）代　理　人　　　星　　野　　恒　　司−・、７− 手続補正書（自発）昭和５６年１１月４日特許庁長官　島　１）春　樹　殿１　事件の表示　　　特願昭５６１５１９７２号２、発
　明　の名称衝突検出方式３、補正をする者事件との関係　　　出願人住　　所　　　東京都千代田区内幸町１丁目１番６号名
　称　　（４２２）　　日本電信電話公社代表者　　　
　　　　　　真　　藤　　　　　　恒４、代理人〒１０
５電話ｏ３　（４３１）　８１１１番（代表）５、補正（
こより増加する発明の数　　　０２７−１．２８−］を
伝搬する。方向性結合装置２２−１１光信号のような方
向性を実現し易い信号を使用する場合に一本方式で必要
な方向別送受信機能をもつ結合装置は第６図の例に示す
高分子光回路を用いて、又はプリズノ１、ミラーを使用
したＴカップラの組合ぜによって実現できる。同軸ケー
ブル、対より線等の伝送路を用いる場合に一信号の方向
性を実現する工夫が必要と庁る。第７図は方向性結合装置及びハイブリッド回路を用いて
、同軸ケーブル、対より線のよう外伝送路用に第６図に
示す結合装置を実現した例である。５−１．５−２は伝
送路、２１−１．２１−２はハイブリッド回路、２２−
１．２２−２は方向性結合装置、２３−１．２３−２は
分岐装置、２４−’Ｉ、２４−２は送信信号線、２５−
１．２５−２は受信信号線、２６１．２６２゜２７１＝
　２７２，２８　Ｌ　２８２は信号線である。左方から
の信号はハイブリッド回路２１−１により２８−２゜２
７２．２６　Ｑを伝搬し、ハイブリッド回路２１−２を
経由して５−２へ伝わるが、２８−１．２７−１．２６
−１へは伝わらない。右方からの信号は同様に２６−１
゜る信号線、３８は衝空徐出信丹を□＊Ｉ余出回［絡は
右方からの信号（２７−１）と送信信号（２４−］）　
を左方へ伝えるが、信号が２４−１から信号線２７−１
へ伝わること目ない。従って分岐装置２３−１　から受
信される信けは右方からの信号だけである。左方からの１言号についても同じであり、結果的ては第
６図と同じ動作を行う。なお、この場合、一本の伝送路
を双方向に使用するより第３図に示すような方向毎に別
々の伝送路を用いる方式かハイブリッド回路が不要とな
り実現が容易となる。第８図は本発明を用いた衝突検出装置の具体的な構成例
である。２９−１．２９−２は伝送路、３０は結合装置
、３１は送信回路、３２−１．３２−２は各々右方向及
び左方向からの信号検出回路、３３は受信回路、３４は
衝突検出回路、：（５ｄ送信回路と結合装置を接続する
信号線又は導波路、３６　］、３６２は各々右方向及び
左方向からの信号を１を号検出回路へ伝える信号線又は
導波路、３７は送信データをノードから送信回路へ伝え
一：３− からノードへ伝える信号線、３９１、受信データをノー
ドへ伝えるだめの信号線、４０附送信回路と衝突積出回
路を接続１〜送信中の状態を伝えるだめの信号線、４１
−１．４１−２　ｉ検出した右方向、左方向の信号を受
信回路へ伝える／こめの信号線、／１２−］、　、１２
−２は信月受信中の゛状態を１言−号検出回路から衝突
検出回路へｆぺえる信は線である。衝突検出回路３７１
は信−Ｖ；線４０の送ｆｉｉ状態と信号線４２−］、４
２−２の受信状態情報から、送１ｄ中でかつ信号受信中
の場合に送ＩＫ　ｆＳけが衝突したと判断して衝突検出
借りをノートへ送信する。以上説明したように、伝送路及び結合装置のもつ信号伝
搬の方向４ノ１を利用することにより、自ノードの送信
信号を受信しない接続が可能となり、送信中の受［ｎの
有無に」、り衝突が検出できるだめ、衝突検出装置が簡
単な構成で実現できる。４、図面の簡単な説明第１図は本発明の一実施例の概略図、第２図４− は第１図の結合装置２の部分の拡大図、第３図は第２図
の別の実施例、第４図は本発明の別の実施例の概略図、
第５図は第４図の結合装置９の部分の拡大図、第６図は
第２図の具体的な実施例、第７図は第２図の別の実施例
、第８図は衝突検出装置の具体的な構成の一例を示すも
のである。１、］−１，１−２−・・・光フアイバ伝送路、　２−
１゜２−−２．２−３・−・・・・・結合装置、　３−
１．３−２．３−３゜３−４・・パ・終端装置、　７Ｉ
−１，４−２，７１−３・・ノルド、　５−１．５−２
・・・・・伝送路、　６−１　　・・・・・・左方向か
ら受信し、左方向へ送信する導波図、６−２−・　・・
右方向から受信し、右方向へ送信する導波路、　７−１
　　　・左方向からの受１吾用導波路、　７−２　・・
・・・・・右方向からの受信用導波路、８−１−・・右
方向への送信用導波路、　８−２・・・・・・・・・左
方向への送信用導波路、　９−１．９−２．９−３・・
・・結合装置、　１０−１・・・・・・・右方向への送
信用導波路、　１０−２・・・・・・・・・左方向への
送信用導波路、１１−１’・・・・・・・・左方向から
の受信用導波路・１１−２・・・・・・・・右方１ｈ」
からの受信用導波路、　１２−］、］２−２　　・・・
・・・分岐集線を行う導波路、　＋３−Ｃ１３−２・・
・・・・・・光ファイバと導波路の結合部、１４−１・
１４−２　　・・・・・・光送信装置、　＋　５−１．
１＋　５−２・・・・・・・・光受信装置、　１６Ｌ］
６２　　・・・・・・受信１言号用接続ケーブル、　ｌ
　７−’Ｌ　＋　７−２・・・・・・・・送信信月用接
続ケーブル、　１８−１〜］８−４　　・・　結合装置
と接続ケーブルとの接続装置、　Ｉ　Ｃ１−１＋　１９
−２　　　・・・結合装置と伝送路との接続装置、　２
０　　・・・・結合装置の筐体、　２］−１，２１−２
・−・・・・　ハイブリッド回路、２２−１．、２２−
２−・・・方向性結合装置、　２３−１．２３−２・　
・・　分岐装置、　２４−１．２４−２・・・・・・・
・送悄ｉＲ号線、２５−］、　　　２５−２　　・・　
　・・−受ｆｌ言−弓　線、　　　２ｆｉ　　　］、　
　］２６−２２７−１．２７−２．２８−１．２８−２
　　・・・・１バ号線、　２！ｌ−］。２９−２　・・・・・・・・伝送路、　３　（１・・・
・・　結合装置、３１　　・・・・送信回路、　３２−
１，３２−２・・・・・・信号検出回路、　：つ：つ・
−・・受信回路、　：３４・・・・・・・衝突検出回路
、　：う５・・・・・・・・送信回路と結合装置を接続
する信号線、　３（ｉ　］、３６２−・・・・・結合装
置と受１ｇ回路を接続する信号線、　３７　　・・・−
ノードと送信回路を接続する信号線、　３８・・・・・
・・衝突検出回路どノードを接続する信号線、　３９・
・・・・・・・・受信回路とノードを接続する信号線、
　４０・・・・・・・送信回路と衝突検出回路を接続す
る信号線、　４］−１゜４１−２・・・・・・信号検出
回路と受信回路を接続する信号線、　４２−］、４２−
２　　・・・・・信号検出回路と衝突検出回路を接続す
る信号線０」（２）　　別紙第７図および第８図を追加する。以」ニア− 第７図第８図０２９−１　　　　　　２９−２３６−四〜　３６− ３１　　３２−１　　　３２−２４０　４２−１ −１へ４２−２　　　４１−２３４　　　　　　３３手続補正書（自発）昭和５６年１１月２ｅ日特許庁長官　島　１）春　樹　　殿１・事件の表示　　　　特願昭５６−１５１９７２号２
、発　明　の名称衝突検出方式３、補正をする者事件との関係　　　出願人住　所　　　東京都千代田区内幸町１丁目１番６号名　
称　　（４２：２）　　日本電信電話公社代表者　　　
　　　　　　真　　藤　　　　　　恒４、代理人〒１０
５電話０３　（４３１）　８１１１番（代表）第５図３２３−Figure 1 d is a schematic diagram of an embodiment of the present invention; Figure 2 fJ;
3 is another embodiment of the tooth 2, FIG. 4 is a schematic diagram of another embodiment of the present invention, and FIG. 5 is a schematic diagram of the coupling device 9 of FIG. 4. FIG. 6, which is an enlarged view of the portion shown in FIG. 6, is a specific example of the embodiment shown in FIG. ], ]-], , 1-2-1/Optical fiber transmission line, 2
−], 2-2.2-3 ・−・−・Coupling device, 3
〜1.3-2゜3-3.3-4 −・−・Terminal device,
4-1.4-2.4-3... Node, 5-
1.5-2...Transmission line, 6-1...
... waveguide that transmits from the left direction to the reception l-1 left direction,
6-2 - Waveguide for receiving from the right direction and transmitting to the right, 7-1 Waveguide for receiving from the left, 7-2... Right direction Waveguide for reception from 8-1...Waveguide for transmission to the right,
8-2 Pa... Waveguide for transmission to the left! 1l
-1. ! l-2.9-3-...Coupling device, 10-
1...--Transmission waveguide to the right, 1o-
2... Waveguide for transmission to the left, ]1-1...
...Waveguide for reception from the left direction, 1]-2・Waveguide for reception from the right direction, 12-1.12-2 ・・Waveguide for branching and concentrating, 13-1.13-2 ・...Coupling part of optical fiber and waveguide, 14-1.14-2...
...Optical transmitter, 15-1. ]5-2...
Optical receiver, ](i], 162...
Reception signal connection cable, 17-1. ]? -2--
... Connection cable for sending I signal, 18-1 to 1
8-4 -...Coupling device and connecting cable, etc.] 9-1. ] 'l-2... Connection device between the coupling device and the transmission line, 20... Housing of the coupling device. Patent applicant: Nippon Telegraph and Telephone Public Corporation, 1゛・1″nee・) Agent: Tsuneji Hoshino, 7- Procedural amendment (voluntary) November 4, 1980 Commissioner of the Japan Patent Office Shima 1) Haruki Tono 1 Indication of the case Japanese Patent Application No. 5,615,1972 2, Name of the invention Collision detection method 3, Person making the amendment Relationship with the case Applicant address 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Name (422) Nippon Telegraph telephone corporation representative
Tsune Shinfuji 4, agent 〒10
5 Telephone number o3 (431) 8111 (representative) 5, correction (
The number of inventions increasing from this 027-1.28-] is propagated. Directional coupling device 22-11 When using a signal such as an optical signal that can easily realize directionality, a coupling device that has a direction-specific transmission and reception function that is necessary in a single-line system is the polymer optical circuit shown in the example in Fig. 6. This can be realized using a combination of a T-coupler using Prison No. 1 and a mirror. When using transmission lines such as coaxial cables and twisted pair wires, it is necessary to devise ways to achieve single signal directionality. FIG. 7 is an example of realizing the coupling device shown in FIG. 6 for an external transmission line such as a coaxial cable or twisted pair wire using a directional coupling device and a hybrid circuit. 5-1.5-2 is a transmission line, 21-1.21-2 is a hybrid circuit, 22-
1.22-2 is a directional coupling device, 23-1.23-2 is a branching device, 24-'I, 24-2 is a transmission signal line, 25-
1.25-2 is the receiving signal line, 261.262°271=
272, 28 L 282 is a signal line. The signal from the left is 28-2°2 by the hybrid circuit 21-1.
72.26 Q is propagated and transmitted to 5-2 via hybrid circuit 21-2, but 28-1.27-1.26
-1 is not transmitted. The signal from the right is 26-1 as well.
゜Signal line, 38 connects the airflow and air flow to the left □*I [The connection is the signal from the right (27-1) and the transmission signal (24-])
is transmitted to the left, but the signal is from 24-1 to signal line 27-1.
There's nothing to convey to you. Therefore, the only signal received from branching device 23-1 is the signal from the right side. The same goes for one word from the left, and the result is the same operation as in FIG. 6. In this case, rather than using one transmission line in both directions, it is easier to realize the system using separate transmission lines for each direction as shown in FIG. 3, or eliminating the need for a hybrid circuit. FIG. 8 shows a specific configuration example of a collision detection device using the present invention. 29-1, 29-2 is a transmission path, 30 is a coupling device, 31 is a transmitting circuit, 32-1, 32-2 is a signal detection circuit from the right direction and left direction, 33 is a receiving circuit, and 34 is a collision detection circuit. Circuit: (Signal line or waveguide connecting the 5d transmitter circuit and coupling device, 36), 362 is a signal line or waveguide that transmits signals from the right and left directions to the number detection circuit, 37 is a transmission A signal line for transmitting data from the node to the transmitting circuit 1: 3- A signal line for transmitting the data to the node, 391, a signal line for transmitting the received data to the node, attached to 40 Connecting the transmitting circuit and the collision loading circuit 1 - Status during transmission The signal line that cannot be transmitted, 41
-1.41-2 iTransmit the detected right and left signals to the receiving circuit/Kome signal line, /12-], ,12
-2 is a line that conveys the status during signal reception from the word detection circuit to the collision detection circuit. Collision detection circuit 371
is signal-V; transmission fii state of line 40 and signal line 42-], 4
Based on the reception status information in 2-2, if the transmission is in progress and the signal is being received, it is determined that a collision has occurred in the transmission IK fS, and a collision detection message is transmitted to the notebook. As explained above, by using the four directions of signal propagation of the transmission path and the coupling device, it is possible to connect without receiving the transmission signal of the own node, Since collisions can be detected, a collision detection device can be realized with a simple configuration. 4. Brief description of the drawings FIG. 1 is a schematic diagram of one embodiment of the present invention, FIG. 2 is an enlarged view of a portion of the coupling device 2 in FIG. Example, FIG. 4 is a schematic diagram of another example of the present invention,
Fig. 5 is an enlarged view of the coupling device 9 in Fig. 4, Fig. 6 is a specific embodiment of Fig. 2, Fig. 7 is another embodiment of Fig. 2, and Fig. 8 is collision detection. An example of a specific configuration of the device is shown. 1, ]-1, 1-2-... optical fiber transmission line, 2-
1゜2--2.2-3...Coupling device, 3-
1.3-2.3-3゜3-4...P/terminal device, 7I
-1,4-2,71-3... Nord, 5-1.5-2
...Transmission path, 6-1 ... Waveguide diagram for receiving from the left and transmitting to the left, 6-2-...
Waveguide that receives from the right and transmits to the right, 7-1
・Waveguide for reception from the left direction, 7-2...
... Waveguide for reception from the right direction, 8-1-... Waveguide for transmission from the right direction, 8-2 ... Waveguide for transmission from the left direction, 9-1.9-2.9-3...
...Coupling device, 10-1... Waveguide for transmission to the right, 10-2... Waveguide for transmission to the left, 11-1'.・・・・・・Receiving waveguide from left direction・11-2・・・・・・・Right side 1h”
Receiving waveguide from 12-], ]2-2...
...Waveguide for branching and concentrating, +3-C13-2...
・・・・・・Coupling part of optical fiber and waveguide, 14-1・
14-2...Optical transmitter, +5-1.
1+ 5-2...Optical receiving device, 16L]
62 ...Connection cable for one receiving language, l
7-'L + 7-2...Connection cable for transmission signal, 18-1~]8-4...Connection device between coupling device and connection cable, I C1-1+ 19
-2 ... Connection device between the coupling device and the transmission line, 2
0... Housing of coupling device, 2]-1, 21-2
・−・・ Hybrid circuit, 22-1. , 22-
2-... Directional coupling device, 23-1.23-2.
・・ Branching device, 24-1.24-2・・・・・・・
・Shunyu iR Line, 25-], 25-2...
... - Ufl word - bow line, 2fi],
]26-227-1.27-2.28-1.28-2
...Line 1, 2! l-]. 29-2...Transmission line, 3 (1...
... Coupling device, 31 ... Transmission circuit, 32-
1,32-2...Signal detection circuit, :tsu:tsu・
-... Receiving circuit, : 34... Collision detection circuit, : U5... Signal line connecting the transmitting circuit and coupling device, 3(i], 362-... ...Signal line connecting the coupling device and the receiving 1g circuit, 37 ...-
Signal line connecting the node and transmission circuit, 38...
...Signal line connecting collision detection circuit and nodes, 39.
・・・・・・Signal line connecting the receiving circuit and the node,
40... Signal line connecting the transmitting circuit and the collision detection circuit, 4]-1゜41-2... Signal line connecting the signal detecting circuit and the receiving circuit, 42-], 42-
2...Signal line 0 connecting the signal detection circuit and collision detection circuit" (2) Add attached figures 7 and 8. Near- Figure 7 Figure 8 0 29-1 29-2 36-4 ~ 36- 31 32-1 32-2 40 42-1 -1 To 42-2 41-2 34 33 Procedural amendment (voluntary ) November 2e, 1980 Director General of the Japan Patent Office Shima 1) Haruki Tono 1・Case Indication Patent Application No. 151972 No. 1988 2
, Invention name collision detection method 3, Relationship with the amended person case Applicant address 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo
(42:2) Representative of Nippon Telegraph and Telephone Public Corporation
Tsune Shinfuji 4, agent 〒10
5 Telephone number 03 (431) 8111 (main) Figure 5 323-

Claims

[Claims]

In a local network based on a contention force system in which nodes having processors, terminal equipment, transmitting devices, receiving devices, etc. are connected, when the node sends a signal to the local network, its own transmitting device Using a coupling device that directionally couples the transmitting device and the receiving device to the transmission path so that the transmitted signal is not detected as the received signal by the own receiving device,
Connecting the node to the local NenoI work [7
, above) - A collision detection power method characterized in that a collision between Shinzuki and Tsuyoshi is detected by receiving some kind of collision during transmission.