JPH02121434A - Local area network - Google Patents
Local area networkInfo
- Publication number
- JPH02121434A JPH02121434A JP63273314A JP27331488A JPH02121434A JP H02121434 A JPH02121434 A JP H02121434A JP 63273314 A JP63273314 A JP 63273314A JP 27331488 A JP27331488 A JP 27331488A JP H02121434 A JPH02121434 A JP H02121434A
- Authority
- JP
- Japan
- Prior art keywords
- transmission line
- system transmission
- area network
- local area
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 98
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000000969 carrier Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、運用系と予備系の２系統の伝送路を有する
ローカルエリアネットワークに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a local area network having two transmission lines, an active system and a standby system.
第５図は例えば特開昭６２−１２６７３４号公報に示さ
れた従来のローカルエリアネットワークを示すブロック
図接続であり、図において、１はＡ光伝送路、２はＢ系
伝送路であり、これらに切換制御局３と局４〜７が接続
されている。Ａ光伝送路ｌとＢ光伝送路２のうち、例え
ばＡ光伝送路ｌを運用系伝送路、もう一方のＢ光伝送路
２を予備系伝送路として通信が行われる。FIG. 5 is a block diagram connection showing a conventional local area network disclosed in, for example, Japanese Unexamined Patent Publication No. 62-126734. In the figure, 1 is an A optical transmission line, 2 is a B system transmission line, and these Switching control station 3 and stations 4 to 7 are connected to. Of the A optical transmission line 1 and the B optical transmission line 2, communication is performed using, for example, the A optical transmission line 1 as an active transmission line and the other B optical transmission line 2 as a protection transmission line.
次に動作について説明する。Ａ系伝送路１を上記のよう
に運用系伝送路、Ｂ光伝送路２を予備系伝送路として通
信を行っている途中に、Ａ系伝送路１に障害が発生した
場合、切換制御局３はＢ光伝送路２に対しＢ光伝送路２
への切換指示の同報パケットを送出する０局４〜７は常
時予備系であるＢ光伝送路２をモニタしており、切換指
示の上記同報パケットを受信すると、通信をＢ光伝送路
２に切換える。この結果、Ｂ光伝送路２が運用系、Ａ系
伝送路１が予備系としてそれぞれ切換え運用される。Next, the operation will be explained. If a failure occurs in the A-system transmission line 1 while communication is being performed using the A-system transmission line 1 as the active transmission line and the B optical transmission line 2 as the backup transmission line as described above, the switching control station 3 is B optical transmission line 2 for B optical transmission line 2.
Stations 4 to 7, which send out the broadcast packet instructing switching to Switch to 2. As a result, the B optical transmission line 2 is operated as an active system, and the A system transmission line 1 is operated as a protection system.
従来のローカルエリアネットワークは以上のように構成
されているので、障害発生時に運用系伝送路、予備系伝
送路のＡ系伝送路１およびＢ系伝送路２を一方から他方
へ一斉に切換えることが必要で、このため両系伝送路が
部分的に故障した場合でも通信が全く行えなくなってし
まうなどの問題点があった。Since the conventional local area network is configured as described above, when a failure occurs, it is possible to switch the A-system transmission line 1 and the B-system transmission line 2, which are the active transmission line and the protection transmission line, from one to the other all at once. Therefore, even if both transmission lines partially fail, there is a problem that communication cannot be performed at all.
この発明は上記のような問題点を解消するためになされ
たもので、連用系および予備系のいずれの伝送路にも部
分的に障害が発生した場合でも、通信を継続して実施す
ることができるローカルエリアネットワークを得ること
を目的とする。This invention was made to solve the above-mentioned problems, and it is possible to continue communication even if a failure occurs partially in either the active or standby transmission line. The aim is to obtain a local area network that can be used.
この発明に係るローカルエリアネットワークは、運用系
伝送路と予備系伝送路とにそれぞれ互いにパケット通信
を行う複数の局を接続し、切換制御局に設けたモニタ手
段によって、上記運用系伝送路と上記予備系伝送路の切
換状態および上記部の機能をモニタし、上記連用系伝送
路および予備系伝送路の一方から他方への切換制御を、
切換制御手段により同報パケットによって一斉に行える
ようにしたものである。A local area network according to the present invention connects a plurality of stations that perform packet communication with each other to a working transmission line and a protection transmission line, and uses a monitoring means provided in a switching control station to connect the working transmission line and the Monitors the switching status of the protection transmission line and the functions of the above-mentioned parts, and controls the switching from one of the above-mentioned continuous transmission line and protection transmission line to the other.
The switching control means allows the switching to be performed all at once using broadcast packets.
この発明における切換制御局のモニタ手段は、運用系伝
送路および予備系伝送路の一方から他方への切換状態と
、各局の機能をモニタし、上記各系伝送路を切換えた方
がよいかを判断し、もし切換えた方がよいと判断した場
合には、両系伝送路経由で切換−斉同報パケットにより
切換指令を流し、上記一方から他方への切換えおよび結
合を行うことにより、両系伝送路の障害発生箇所が迂回
され、通信サービスを継続して行えるようにする。The monitoring means of the switching control station in this invention monitors the state of switching from one of the working transmission lines and the protection transmission line to the other, and the functions of each station, and determines whether it is better to switch the respective transmission lines. If it is determined that it is better to switch, a switching command is sent via a switching/broadcast packet via the transmission line for both systems, and by switching and coupling from one to the other, both systems can be switched. To enable continuous communication service by bypassing the point where a failure occurs in the transmission path.
以下、この発明の一実施例を図について説明する。第１
図において、４，５，６．７はＡ系伝送路１とＢ系伝送
路２とにそれぞれ接続された４台の局、３Ａは切換制御
局で、これが運用系伝送路予備系伝送路の切換状態およ
び局４〜７の機能をモニタするモニタ手段１１と、運用
系伝送路と予備系伝送路を使用して、各系伝送路の切換
制御を一斉同報パケットにより切換制御する切換制御手
段１２とををする。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 4, 5, 6.7 are four stations connected to the A-system transmission line 1 and the B-system transmission line 2, respectively, and 3A is a switching control station, which is the switching control station for the active transmission line and the backup transmission line. A monitoring means 11 for monitoring the switching state and the functions of stations 4 to 7, and a switching control means for controlling switching of each system transmission line using a simultaneous broadcast packet using the active transmission line and the protection transmission line. Do 12.
第２図は第１図に示されるローカルエリアネットワーク
において、Ａ系伝送路１のＰ、 Ｑ点の２箇所およびＢ
系伝送路２のＲ点の１箇所で障害が発生した時の、Ａ系
伝送路１およびＢ系伝送路２の結合状態を示す。Figure 2 shows the local area network shown in Figure 1 at two points, points P and Q of A-system transmission line 1, and at points B.
This figure shows the coupling state of the A-system transmission line 1 and the B-system transmission line 2 when a failure occurs at one point R of the system transmission line 2.
次に動作について、第３図および第４図のフロー図を見
ながら説明する。第１図はＡ系伝送路１を連用系伝送路
、Ｂ系伝送路２を予備系伝送路として通信する正常状態
におけるブロック接続図である。いま、この正常状態に
おいて、第２図に示すようにＰ、 Ｑ、 Ｒ点の３箇所
で障害が発生した場合には、第３図のフローに示すとお
り、モニタ手段１１により、まず、Ａ系伝送路１．Ｂ系
伝送路２が正常か否かを判定しくステップＳＴＩ、５Ｔ
２）、いずれか一方が正常であると判定された場合には
、それぞれ−斉Ａ系接続パケットまたは一斉Ｂ系接続パ
ケットを切換制御手段１２によりＡ系伝送路１．Ｂ系伝
送路２へ送信する（ステップＳＴ３，５Ｔ４）。また、
画伝送路１．２の両方が異常の場合には、−斉結合パケ
ットをＡ系伝送路１．Ｂ系伝送路２に同報する（ステッ
プ５Ｔ５）。そして、これらの状態を各局に間合わせる
（ステップ５Ｔ６）。Next, the operation will be explained with reference to the flowcharts of FIGS. 3 and 4. FIG. 1 is a block connection diagram in a normal state in which communication is performed using the A-system transmission line 1 as an active transmission line and the B-system transmission line 2 as a standby transmission line. Now, in this normal state, if a fault occurs at the three points P, Q, and R as shown in Figure 2, the monitoring means 11 will first check the A system as shown in the flowchart of Figure 3. Transmission line 1. Step STI, 5T to determine whether B system transmission line 2 is normal or not.
2) If either one is determined to be normal, the switching control means 12 switches the simultaneous A system connection packet or the simultaneous B system connection packet to the A system transmission line 1. It is transmitted to the B-system transmission line 2 (steps ST3, 5T4). Also,
If both image transmission lines 1. It broadcasts to the B-system transmission line 2 (step 5T5). These conditions are then communicated to each station (step 5T6).
また、局４〜７の動作は第４図のフロー図に示すように
なる。すなわち、Ａ系伝送路ｌおよびＢ系伝送路２の各
キャリアが正常か否かをモニタ手段１１により判定しく
ステップ５ＴＩＩ、５Ｔ１２）、第２図の局４のように
いずれのキャリアも正常である場合には、切換制御パケ
ットを解析して（ステップ５Ｔ１３）、−斉Ａ系接続指
示または一斉Ｂ系接続指示があったか否かを判定しくス
テップ５Ｔ１４，５Ｔ１５）、各指示があった場合には
、これらのいずれかの接続指示に従って接続を行った後
結合解除しくステップ５Ｔ１６，５Ｔ１７）、そのいず
れの接合指示もない場合は、直接結合解除を行う（ステ
ップ５Ｔ１Ｂ）。Further, the operations of stations 4 to 7 are as shown in the flow diagram of FIG. That is, it is determined by the monitor means 11 whether each carrier of the A-system transmission line 1 and the B-system transmission line 2 is normal or not (steps 5TII, 5T12), and as shown in station 4 in FIG. 2, both carriers are normal. If so, the switching control packet is analyzed (step 5T13), and it is determined whether there is an instruction to connect simultaneous A system or simultaneous B system (steps 5T14, 5T15), and if each instruction is received, After connection is made according to any of these connection instructions, the connection is released (steps 5T16, 5T17), and if there is no connection instruction, the connection is directly released (step 5T1B).
さらに、第２図の局５．７のように、Ａ系伝送路１のキ
ャリアが異常（断）の場合には、Ｂ光伝送路２を局５．
７に接続しくステップ５Ｔ１９）、さらに切換制御パケ
ットの解析を行って（ステップ５Ｔ２０）、−斉結合パ
ケットを受信しくステップ５Ｔ２１）、そのＢ光伝送路
２のデータを局５．７を通してＡ系伝送路１へ送出する
（ステップ５Ｔ２２）。Furthermore, if the carrier of the A-system transmission line 1 is abnormal (broken), as at station 5.7 in FIG.
7 (step 5T19), further analyzes the switching control packet (step 5T20), receives the simultaneous coupling packet (step 5T21), and transmits the data on the B optical transmission line 2 through the A system through the station 5.7. 1 (step 5T22).
一方、第２図の局６のように、Ｂ光伝送路２のキャリア
が異常（断）の場合には、Ａ系伝送路ｌを局６に接続し
、（ステップ５Ｔ２３）、さらに切換制御パケットの解
析を行って（ステップ５Ｔ２４）、−斉結合パケットを
受信しくステップ５７２５）、そのＡ系伝送路１のデー
タを局６を通してＢ光伝送路２へ送出する（ステップ５
Ｔ２６）。On the other hand, if the carrier of the B optical transmission line 2 is abnormal (broken), as in the case of station 6 in FIG. (Step 5T24) and receive the simultaneous combined packet (Step 5725), and sends the data on the A system transmission line 1 to the B optical transmission line 2 through the station 6 (Step 5
T26).
このようにして、Ｐ、 Ｑ、 Ｒ点の３箇所に故障があ
るにも拘わらず、Ａ系伝送路１とＢ光伝送路２を互いに
結合することができ、故障箇所が迂回されて、通信を継
続できる。In this way, even though there are failures at the three points P, Q, and R, the A-system transmission line 1 and the B-optical transmission line 2 can be connected to each other, and the failure points are bypassed and communication is resumed. can continue.
なお、上記実施例では、Ａ系伝送路１．Ｂ光伝送路２を
平行二線型のローカルエリアネットワークとしているが
、リング状にしたリング型ローカルエリアネットワーク
としてもよく、上記実施例と同様の効果を奏する。In the above embodiment, the A-system transmission line 1. Although the B optical transmission line 2 is a parallel two-wire local area network, it may also be a ring-shaped local area network, and the same effects as in the embodiment described above can be obtained.
以上のように、この発明によれば、運用系伝送路、予備
系伝送路の切換状態や局の機能をモニタ手段によってモ
ニタし、故障箇所があるにも拘わらず、切換制御手段に
より運用系伝送路および予備系伝送路を迂回によって結
合させるように構成したので、通信サービスが引き続き
継続して行えるものが得られる効果がある。As described above, according to the present invention, the switching status of the active transmission line and the backup transmission line and the function of the station are monitored by the monitoring means, and the switching control means prevents the active transmission from occurring even though there is a fault. Since the configuration is such that the transmission line and the protection transmission line are connected by detour, there is an effect that communication services can be continued continuously.
第１図はこの発明の一実施例によるローカルエリアネッ
トワークを示すブロック接続図、第２図は第１図に示す
ローカルエリアネットワークが故障点を有する場合にお
ける結合運転中の通信状態を示すブロック接続図、第３
図はローカルエリアネットワークにおける切換制御局の
動作を示すフロー図、第４図はローカルエリアネットワ
ークにおける局間の接続動作を示すフロー図、第５図は
従来のローカルエリアネットワークを示すブロック接続
図である。
１は運用系伝送路（Ａ系伝送路）、２は予備系伝送路（
Ｂ系伝送路）、３Ａは切換制御局、４゜５．６．７は局
、１１はモニタ手段、１２は切換制御手段。
なお、図中、同一符号は同一、または相当部分を示す。FIG. 1 is a block connection diagram showing a local area network according to an embodiment of the present invention, and FIG. 2 is a block connection diagram showing the communication state during coupled operation when the local area network shown in FIG. 1 has a failure point. , 3rd
The figure is a flow diagram showing the operation of a switching control station in a local area network, FIG. 4 is a flow diagram showing the connection operation between stations in a local area network, and FIG. 5 is a block connection diagram showing a conventional local area network. . 1 is the active transmission line (A-system transmission line), and 2 is the protection transmission line (A-system transmission line).
3A is a switching control station, 4°5.6.7 is a station, 11 is a monitor means, and 12 is a switching control means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
て、互いにパケット通信を行う複数の局と、上記運用系
伝送路および予備系伝送路の一方から他方へ通信を切り
換える切換制御局とを備えたローカルエリアネットワー
クにおいて、上記切換制御局を上記運用系伝送路または
予備系伝送路による通信の切換状態および上記各局の機
能をモニタするモニタ手段と、上記通信の切換制御を同
報パケットにより一斉に行う切換制御手段とから構成し
たことを特徴とするローカルエリアネットワーク。A plurality of stations are connected to the working transmission line and the protection transmission line and perform packet communications with each other, and a switching control station switches communication from one of the working transmission line and the protection transmission line to the other. In the local area network, the switching control station is provided with a monitoring means for monitoring the switching state of communication by the working transmission line or the protection transmission line and the functions of each of the stations, and controlling the switching of the communication all at once using a broadcast packet. A local area network comprising switching control means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63273314A JPH02121434A (en) | 1988-10-31 | 1988-10-31 | Local area network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63273314A JPH02121434A (en) | 1988-10-31 | 1988-10-31 | Local area network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02121434A true JPH02121434A (en) | 1990-05-09 |
Family
ID=17526150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63273314A Pending JPH02121434A (en) | 1988-10-31 | 1988-10-31 | Local area network |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02121434A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05118A (en) * | 1991-02-15 | 1993-01-08 | Katsuji Norizuki | Buddhist altar |
| JPH07226751A (en) * | 1993-06-29 | 1995-08-22 | Nec Corp | Tap with fault medium automatic changeover function |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6271347A (en) * | 1985-09-24 | 1987-04-02 | Nec Corp | Communication network equipment |
| JPS62126734A (en) * | 1985-11-27 | 1987-06-09 | Nec Corp | Switching system for local area network |
| JPS62252244A (en) * | 1986-04-25 | 1987-11-04 | Fujitsu Ltd | Dividing system for circuit of line switching device |
-
1988
- 1988-10-31 JP JP63273314A patent/JPH02121434A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6271347A (en) * | 1985-09-24 | 1987-04-02 | Nec Corp | Communication network equipment |
| JPS62126734A (en) * | 1985-11-27 | 1987-06-09 | Nec Corp | Switching system for local area network |
| JPS62252244A (en) * | 1986-04-25 | 1987-11-04 | Fujitsu Ltd | Dividing system for circuit of line switching device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05118A (en) * | 1991-02-15 | 1993-01-08 | Katsuji Norizuki | Buddhist altar |
| JPH07226751A (en) * | 1993-06-29 | 1995-08-22 | Nec Corp | Tap with fault medium automatic changeover function |
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