JPH0295031A - Transmission line switching system - Google Patents
Transmission line switching systemInfo
- Publication number
- JPH0295031A JPH0295031A JP63247043A JP24704388A JPH0295031A JP H0295031 A JPH0295031 A JP H0295031A JP 63247043 A JP63247043 A JP 63247043A JP 24704388 A JP24704388 A JP 24704388A JP H0295031 A JPH0295031 A JP H0295031A
- Authority
- JP
- Japan
- Prior art keywords
- bridge
- transmission line
- signal
- terminal station
- switching
- 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 title claims abstract description 63
- 238000012790 confirmation Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- RGNPBRKPHBKNKX-UHFFFAOYSA-N hexaflumuron Chemical compound C1=C(Cl)C(OC(F)(F)C(F)F)=C(Cl)C=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F RGNPBRKPHBKNKX-UHFFFAOYSA-N 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要］
対向する端局間に生じた障害の伝送路を予備伝送路に切
り替える方式に関し、
端局間の伝送路の切替確認信号を専用の回線を用いずに
伝送できる方式を実現することを目的とし、
第１の端局で伝送路の障害を伝送路障害検出回路で検出
してブリッジ要求信号を予備伝送路のオーバーヘッドピ
ットを使用して対向した第２の端局に送り、該第２の端
局では該ブリッジ要求信号に基づいてブリッジ制御回路
が切替回路により該障害伝送路を該予備伝送路へブリッ
ジするとともに該ブリッジ結果信号を該第１の端局に送
り、スイッチ制御回路が該ブリッジ要求信号とブリッジ
結果信号との一致を検出した時にスイッチを制御して該
障害伝送路を該予備伝送路へ切り替える伝送路切替方式
において、該ブリッジ要求信号と該ブリッジ結果信号と
を比較して一致したとき切替確認信号を発生する一致検
出回路を該第２の端局に設けたもの。[Detailed Description of the Invention] [Summary] Regarding a method for switching a faulty transmission line between opposing terminal stations to a backup transmission line, the present invention provides a method for transmitting a switching confirmation signal for a transmission line between terminal stations without using a dedicated line. The aim is to realize a system that can transmit a bridge request signal by detecting a failure in the transmission line at the first terminal station using a transmission line failure detection circuit, and transmitting the bridge request signal to the second terminal station facing the other side using the overhead pit of the backup transmission line. At the second terminal station, based on the bridge request signal, the bridge control circuit bridges the faulty transmission line to the protection transmission line using a switching circuit, and transmits the bridge result signal to the first terminal station. In a transmission line switching method, when a switch control circuit detects a match between the bridge request signal and the bridge result signal, the switch is controlled to switch the faulty transmission line to the backup transmission line. The second terminal station is provided with a coincidence detection circuit that generates a switching confirmation signal when the bridge result signal is compared with the bridge result signal.
本発明は伝送路切替方式に関し、特に対向する端局間に
生じた障害の伝送路を予備伝送路に切り替える方式に関
するものである。The present invention relates to a transmission line switching system, and particularly to a system for switching a faulty transmission line between opposing terminal stations to a backup transmission line.
伝送路障害は出来るだけ速く検出してその障害に対処し
なければならないが、そのためには伝送路障害を検出し
てからその障害情報を知らせる必要があり、この障害情
報の情報量が大きくならないようにすることが望まれて
いる。Transmission path failures must be detected and dealt with as quickly as possible, but in order to do so, it is necessary to detect transmission path failures and then notify the failure information. It is hoped that
第３図は従来の伝送路切替方式（ＳＯＮＥＴ切替方式又
は後方切替方式と呼ばれる）を示したもので、対向する
第１及び第２の端局１−２間はｎ （ｎ＞１）本の現用
の伝送路り１〜Ｌｎによって接続されており、これらの
伝送路Ｌ１〜しわに加えて予備の伝送路（救済用伝送路
）Ｐが設けられている。Figure 3 shows a conventional transmission line switching method (called SONET switching method or backward switching method), in which there are n (n>1) transmission lines between opposing first and second terminal stations 1 and 2. They are connected by current transmission lines 1 to Ln, and in addition to these transmission lines L1 to Wrinkle, a backup transmission line (relief transmission line) P is provided.
そして、正常状態では、予備伝送路Ｐを用いずに端局２
の出力信号を現用伝送路り、−Ｌ、、を介して端局１に
送り、端局１ではスイッチ１３を介して次の端局（図示
せず）へ信号転送している。In a normal state, the terminal station 2 does not use the backup transmission path P.
The output signal of is sent to the terminal station 1 via the current transmission line -L, and the signal is transferred from the terminal station 1 to the next terminal station (not shown) via the switch 13.
今、例えば伝送路しいに障害が発生したときには、端局
１の伝送路障害検出回路１１でその伝送路障害を検出し
て伝送路Ｌ７を予備伝送路Ｐに切り替えるためのブリッ
ジ要求ヂャネル番号信号（ＳＯＮＥＴ方式では第４図（
ａ）に示すように１ハイドのに１ハイドの下位４ビット
＃Ｓ信号で以下ブリッジ要求信号と略称する）を予備伝
送路Ｐのオーバーヘッドピットを使用して対向した端局
２に送り、端局２ではそのブリッジ要求信号をブリッジ
制御回路１４が受信して切替回路１５を切替制御するこ
とにより伝送路り。だけを予備伝送路Ｐヘブリッジする
。Now, for example, when a failure occurs in the transmission line, the transmission line failure detection circuit 11 of the terminal station 1 detects the transmission line failure and sends a bridge request channel number signal ( In the SONET system, Figure 4 (
As shown in a), the lower 4-bit #S signal (hereinafter abbreviated as bridge request signal) of 1 hide is sent to the opposing terminal station 2 using the overhead pit of the backup transmission path P, and the terminal station 2, the bridge control circuit 14 receives the bridge request signal and controls the switching circuit 15 to switch the transmission path. Only the transmission line is bridged to the protection transmission line P.
切替回路１５をブリッジしたときの予備回線使用チャネ
ル番号信号（ＳＯＮＥＴ方式では第４１１Ｊ（ｔ））に
示すように１ハイドのに２バイ１〜の上位４ビット＃ｂ
信号で以下ブリッジ結果信号と略称する）は端局１のス
イ・ンチ制御回路１２に送られ、このスイッチ制御回路
１２ではブリッジ要求信号とブリッジ結果信号とを比較
し一致した時、スイッチ１３を制御して障害伝送路り、
、を予備伝送路Ｐへ切り替えるとともに、その一致した
ことを例えばＬＥＤにより切替確認表示として点灯し、
更にこの切替確認状態を端局２にも知らせるため、その
−致検出信号を専用回線Ｓを介して端局２に送り、端局
２で切替動作が正常に行われたことを確認した旨の切替
状態を例えばＬＥＤ表示する。As shown in the protection line use channel number signal (No. 411J(t) in the SONET system) when the switching circuit 15 is bridged, the upper 4 bits #b of 2 by 1 to 1 hide
The signal (hereinafter abbreviated as the bridge result signal) is sent to the switch control circuit 12 of the terminal station 1, and this switch control circuit 12 compares the bridge request signal and the bridge result signal, and when they match, controls the switch 13. If there is a faulty transmission path,
, is switched to the backup transmission line P, and the match is indicated by lighting up, for example, an LED to confirm the switching,
Furthermore, in order to notify the terminal station 2 of this switching confirmation status, the match detection signal is sent to the terminal station 2 via the dedicated line S, and the terminal station 2 sends a message indicating that it has confirmed that the switching operation has been performed normally. The switching state is displayed, for example, on an LED.
このようにして対向する端局間で伝送路の切替動作の確
認を行っている。In this way, the switching operation of the transmission path is confirmed between the opposing terminal stations.
しかしながら、このような伝送路切替方式の場合には、
端局側の切替確認を知らせる信号を専用の回線を介して
送る必要があったため、回線を余分に用意しなければな
らず通信コストが不経済であった。However, in the case of such a transmission line switching method,
Since it was necessary to send a signal notifying the terminal station of switching confirmation via a dedicated line, an extra line had to be prepared, resulting in uneconomical communication costs.
従って、本発明は、端局間の伝送路の切替確認信号を専
用の回線を用いずに伝送できる方式を実現することを目
的とする。Therefore, an object of the present invention is to realize a system that can transmit a switching confirmation signal of a transmission path between terminal stations without using a dedicated line.
上記の目的を達成するため、本発明に係る伝送路切替方
式では、第１図に原理的に示すように、端局Ｉで発生さ
れたブリッジ要求信号と端局２で発生されたブリッジ結
果信号とを比較して一致したとき切替確認信号を発生す
る一致検出回路２０を端局２に設けたものである。In order to achieve the above object, in the transmission line switching system according to the present invention, as shown in principle in FIG. The terminal station 2 is provided with a coincidence detection circuit 20 which generates a switching confirmation signal when the signals match.
端局１の伝送路障害検出回路１１から発生されたブリッ
ジ要求信号は、障害の起きた現°用の伝送路から予備の
伝送路Ｐへ端局２側でブリッジすることを要求する信号
であり、ブリッジ結果信号は端局２のブリッジ制御回路
１４が切替回路１５をブリッジ制御した時の結果を示す
信号である。The bridge request signal generated from the transmission line fault detection circuit 11 of the terminal station 1 is a signal requesting that the terminal station 2 perform bridging from the faulty working transmission line to the backup transmission line P. The bridge result signal is a signal indicating the result when the bridge control circuit 14 of the terminal station 2 performs bridge control on the switching circuit 15.
従って、これらの信号を端局２において一致検出回路２
０で一致検出すれば、専用の回線を介して端局１の側か
ら切替確認信号を貰わなくとも端局２自身で切替確認を
行うことができる。Therefore, these signals are sent to the coincidence detection circuit 2 at the terminal station 2.
If a match is detected with 0, the terminal station 2 can confirm switching by itself without receiving a switching confirmation signal from the terminal station 1 via a dedicated line.
第２図は、第１図に示した本発明による伝送路切替方式
に使用される一致検出回路２ｏの一実施例を示した図で
、この実施例では、上述の例と同様に、５ＯＮＥＴ方式
として１バイトのブリッジ要求信号＃Ｓ及びブリッジ結
果信号＃ｂとを用い、それぞれシフトレジスタＳＲ０〜
ＳＲ＋４とラッチ回路２１１１〜２１．４及びシフトレ
ジスタＳＲ２，〜Ｓ Ｒ２ａとラッチ回路２１゜１〜２
１２４により並列４ビツトのブリッジ要求チャネル番号
信号＃Ｓ及びブリッジ結果信号＃ｂに変換した後、ＥＯ
Ｒゲート２２、〜２２４にそれぞれ１ビツトづつ入力さ
せ、ＥＯＲゲート２２Ｉ〜２２４の全出力をＮ。FIG. 2 is a diagram showing an embodiment of the coincidence detection circuit 2o used in the transmission line switching system according to the present invention shown in FIG. 1-byte bridge request signal #S and bridge result signal #b are used as shift registers SR0 to SR0, respectively.
SR+4 and latch circuits 2111-21.4 and shift registers SR2, ~SR2a and latch circuits 21°1-2
124 into parallel 4-bit bridge request channel number signal #S and bridge result signal #b, EO
One bit is input to each of the R gates 22 and 224, and all outputs of the EOR gates 22I to 224 are N.
Ｒゲート２３に集め、ＮＯＲゲート２３の出力を切替確
認信号としてＬＥＤ （図示せず）に与えるようにして
いる。The output of the NOR gate 23 is collected in the R gate 23, and the output of the NOR gate 23 is applied to an LED (not shown) as a switching confirmation signal.
従って、端局１からのブリッジ要求信号＃Ｓと自局から
のブリッジ結果信号＃ｂとが一致していればＥＯＲゲー
ト２２．〜２２４の各出力は“０°′となり、これをＮ
ＯＲゲート２３を通ずことによりレベル“１“°の切替
確認信号を発生ずることができるが、１ピントでも不一
致のときはいずれかのＥＯＲゲートの出力がパ１”とな
るためＮＯＲゲート２３の出力は′Ｏ゛となって切替確
認信号は発生されず、端局２のオペレータは伝送路の切
替が正常に行われなかったことを知ることになる。Therefore, if the bridge request signal #S from the terminal station 1 and the bridge result signal #b from the own station match, the EOR gate 22. ~224 each output becomes “0°”, which is N
By passing the signal through the OR gate 23, a switching confirmation signal of level "1" can be generated. However, if even one focus does not match, the output of one of the EOR gates becomes "P1". The output becomes 'O', no switching confirmation signal is generated, and the operator at the terminal station 2 knows that the transmission line switching has not been performed normally.
このように本発明の伝送路切替方式によれば、一方の端
局からのブリッジ要求信号とそのブリッジ要求信号を受
けた端局において発生されるブリッジ結果信号とを比較
して一致したときのみ切替確認信号を発生するように構
成したので、端局間に特別の専用回路を用いなくとも、
各端局において伝送路切替の確認動作を行うことができ
る。As described above, according to the transmission line switching method of the present invention, the bridge request signal from one terminal station is compared with the bridge result signal generated at the terminal station that received the bridge request signal, and switching is performed only when they match. Since it is configured to generate a confirmation signal, there is no need to use a special dedicated circuit between terminal stations.
Confirmation of transmission path switching can be performed at each terminal station.
第１図は本発明に係る伝送路切替方式を原理的に示すブ
ロック図、
第２図は本発明に係る伝送路切替方式に用いる一致検出
回路の一実施例を示す回路＋図、第３図は従来の伝送路
切替方式を示すブロック図、
第４図は本発明及び従来例で使用されるチャネル番号信
号（Ｋｌ、Ｋ２バイト＃Ｓ、＃ｂ倍信号を示す図、であ
る。
第１図において、
１．２・・・端局、
１１・・・伝送路障害検出回路、
１２・・・スイッチ制御回路、
１３・・・スイッチ、
１４・・・ブリッジ制御回路、
１５・・・切替回路、
２０・・・−数構出回路、
Ｌｌ−Ｌ、、・・・伝送路、
Ｐ・・・予備伝送路。
図中、同一符号は同−又は相当部分を示す。Fig. 1 is a block diagram showing the principle of the transmission line switching method according to the present invention, Fig. 2 is a circuit + diagram showing an embodiment of the coincidence detection circuit used in the transmission line switching method according to the present invention, and Fig. 3 is a block diagram showing a conventional transmission line switching system, and FIG. 4 is a diagram showing channel number signals (Kl, K2 byte #S, #b times signal) used in the present invention and the conventional example. In, 1.2...Terminal station, 11...Transmission path failure detection circuit, 12...Switch control circuit, 13...Switch, 14...Bridge control circuit, 15...Switching circuit, 20... - several circuits, Ll-L, . . . transmission line, P... protection transmission line. In the drawings, the same reference numerals indicate the same or equivalent parts.
Claims (1)
伝送路障害検出回路（１１）で検出してブリッジ要求信
号を予備伝送路（ｐ）のオーバーヘッドビットを使用し
て対向した第２の端局（２）に送り、該第２の端局（２
）では該ブリッジ要求信号に基づいてブリッジ制御回路
（１４）が切替回路（１５）により該障害伝送路を該予
備伝送路（ｐ）へブリッジするとともに該ブリッジ結果
信号を該第１の端局（１）に送り、スイッチ制御回路（
１２）が該ブリッジ要求信号とブリッジ結果信号との一
致を検出した時にスイッチ（１３）を制御して該障害伝
送路を該予備伝送路（ｐ）へ切り替える伝送路切替方式
において、該ブリッジ要求信号と該ブリッジ結果信号と
を比較して一致したとき切替確認信号を発生する一致検
出回路（２０）を該第２の端局（２）に設けたことを特
徴とする伝送路切替方式。At the first terminal station (1), a transmission path failure detection circuit (11) detects a failure in the transmission path (L_1 to L_n), and a bridge request signal is sent using the overhead bit of the protection transmission path (p). the second terminal station (2), and the second terminal station (2)
), the bridge control circuit (14) uses the switching circuit (15) to bridge the failed transmission line to the protection transmission line (p) based on the bridge request signal, and sends the bridge result signal to the first terminal station ( 1) and switch control circuit (
12) controls a switch (13) to switch the faulty transmission line to the protection transmission line (p) when detecting a match between the bridge request signal and the bridge result signal; A transmission line switching system characterized in that the second terminal station (2) is provided with a coincidence detection circuit (20) that compares the signal and the bridge result signal and generates a switching confirmation signal when they match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63247043A JPH0295031A (en) | 1988-09-30 | 1988-09-30 | Transmission line switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63247043A JPH0295031A (en) | 1988-09-30 | 1988-09-30 | Transmission line switching system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0295031A true JPH0295031A (en) | 1990-04-05 |
Family
ID=17157563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63247043A Pending JPH0295031A (en) | 1988-09-30 | 1988-09-30 | Transmission line switching system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0295031A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5568300A (en) * | 1994-10-04 | 1996-10-22 | Fujitsu Limited | Fiber interface shelf for interfacing ATM switch module and subscriber line or toll switch |
| US5663949A (en) * | 1994-11-15 | 1997-09-02 | Fujitsu Limited | Line protection switching system in duplexed fiber interface shelf |
-
1988
- 1988-09-30 JP JP63247043A patent/JPH0295031A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5568300A (en) * | 1994-10-04 | 1996-10-22 | Fujitsu Limited | Fiber interface shelf for interfacing ATM switch module and subscriber line or toll switch |
| US5663949A (en) * | 1994-11-15 | 1997-09-02 | Fujitsu Limited | Line protection switching system in duplexed fiber interface shelf |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5218465A (en) | Intelligent interconnects for broadband optical networking | |
| US4365248A (en) | Digital transmission link relief triggering system | |
| JPH07264156A (en) | Fault detection system for synchronization communication network | |
| JP2003224571A (en) | Ring control node | |
| KR19980036224A (en) | Control method of 1 + 1 bidirectional line switching using power failure indication signal | |
| JPH0295031A (en) | Transmission line switching system | |
| JPH114206A (en) | Terminal station equipment | |
| JP2737639B2 (en) | Transmission line switching control system | |
| JP2867865B2 (en) | Protection line switching control method | |
| JPS6148249A (en) | Line switching device | |
| JP2503908B2 (en) | Line switching control circuit | |
| JP2841686B2 (en) | Transmission line switching device | |
| JP2611285B2 (en) | Line switching device | |
| JPH02143750A (en) | Transmission line branching device | |
| JPH01236840A (en) | Line switching system | |
| JPS58105654A (en) | Detecting system for line state | |
| JP2002164907A (en) | Path route changeover device and path protection method | |
| JPS6318750A (en) | Line blocking system for line editing device | |
| JPS62243443A (en) | Duplex system loop form data transmission | |
| JPH01125138A (en) | Switching control information transmission system | |
| JPH01215147A (en) | System for duplexing monitor data transfer line | |
| JPH0486133A (en) | Standby link synchronization detection system for duplicate data link | |
| JPS5826865B2 (en) | Loop abnormality detection circuit | |
| JPS60235534A (en) | Route spare transmission system | |
| KR20010003945A (en) | Method for transmitting message by use of inspecting line in transmission system |