JPH01236840A - Line switching system - Google Patents
Line switching systemInfo
- Publication number
- JPH01236840A JPH01236840A JP6448388A JP6448388A JPH01236840A JP H01236840 A JPH01236840 A JP H01236840A JP 6448388 A JP6448388 A JP 6448388A JP 6448388 A JP6448388 A JP 6448388A JP H01236840 A JPH01236840 A JP H01236840A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- switching
- repeater
- control signal
- line
- 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
Links
- 230000005856 abnormality Effects 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims description 30
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 3
- 230000007257 malfunction Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、データ伝送の中継装置の回線切替方式に利用
する。特に、伝送路符号の余剰ビットを用いて監視制御
信号の分岐および挿入を行い、また入力信号異常時には
内部から所定のパタン信号の送出に切替え監視制御信号
の挿入を行う手段を有する中間中継器および監視制御信
号を伝送路符号の余剰ビットを用いて送受信を行う手段
を有する端局中継器にて構成される中継装置の現用系か
ら予備系への回線切替方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a line switching system of a relay device for data transmission. In particular, an intermediate repeater having means for branching and inserting a supervisory control signal using surplus bits of a transmission line code, and for switching to sending a predetermined pattern signal from within and inserting a supervisory control signal when an input signal is abnormal; The present invention relates to a line switching system from a working system to a protection system of a relay device including a terminal repeater having means for transmitting and receiving a supervisory control signal using surplus bits of a transmission line code.
本発明は回線切替方式において、
端局中継局は人力異常を検出したときに回線切替要求信
号を回線切替器に送出して回線切替えを行い、障害発生
箇所の識別を明確にするための所定のパタン信号の送出
は回線切替後に行うことにより、
端局中継器が人力異常の検出を確実に行うことができ、
回線切替を誤動作なく行うことができるようにしたもの
である。The present invention provides a line switching system in which when a terminal relay station detects a manual abnormality, it sends a line switching request signal to a line switching device to switch the line, and performs a predetermined process to clearly identify the location of the failure. By sending the pattern signal after switching the line, the terminal repeater can reliably detect manual abnormalities.
This allows line switching to be performed without malfunction.
従来、回線切替方式は、各種監視制御信号等を収集し多
重化または分離動作を行う監視制御インクフェイス回路
が端局中継器および中間中継器に接続され、端局中継器
では多重化された監視制御信号を伝送路符号の余剰ビッ
トを用いて送受信を行い、また中間中継器では伝送路符
号の余剰ビットを用いて分岐および挿入を行い自局の監
視信号の端局への転送または端局からの制御信号の受信
を可能としている。中間中継器では、伝送路障害により
入力信号断またはフレーム同期はずれの検出時には、こ
の障害中継区間より後方の中間区間へ障害が波及して障
害情報の転送や正常な状態の中間区間の監視制御が不可
能とならないように各々の内部に有する所定のパタン発
生回路より所定のパタン信号(以下、AIS信号という
。)を後方の中間中継器に送出し端局中継器ではAIS
信号を受信することにより、切替要求信号を回線切替器
に送出し回線の切替を行っている。Conventionally, in the line switching system, a supervisory control inkface circuit that collects various supervisory control signals and performs multiplexing or separation operations is connected to end station repeaters and intermediate repeaters, and the end station repeaters perform multiplexed monitoring and control signals. The control signal is transmitted and received using the surplus bits of the transmission line code, and the intermediate repeater performs branching and insertion using the surplus bits of the transmission line code, and transfers the own station's monitoring signal to or from the terminal station. control signals can be received. When an intermediate repeater detects an input signal disconnection or frame synchronization loss due to a transmission path fault, the fault spreads to the intermediate section after the faulty relay section, and the fault information is transferred and the monitoring control of the normal intermediate section is interrupted. In order to prevent this from occurring, a predetermined pattern signal (hereinafter referred to as the AIS signal) is sent from a predetermined pattern generation circuit inside each device to the rear intermediate repeater.
By receiving the signal, a switching request signal is sent to the line switching device to switch the line.
また伝送路の障害が復旧し信号が再人力すると中間中継
器では送出信号をAIS信号から伝送路より受信した信
号に切戻すわけであるが、このときには再入された信号
のフレーム同期がとれ、なおかつ伝送路品質がある一定
以上に回復してから切戻しをかけていた。しかもこの際
に伝送路がより確実に回復したことをrXi認してから
切戻すために伝送路障害が入力信号断付近でふらついた
り、または伝送路品質がしきい値付近でふらついたりし
てAIS信号の切替えと切戻しが繰り返されるのを防ぐ
ため切戻しには、保護時間を設けていた。Also, when the fault in the transmission line is restored and the signal is restored, the intermediate repeater switches the outgoing signal from the AIS signal back to the signal received from the transmission line, but at this time, the frame synchronization of the re-entered signal is established Moreover, the cutback was performed only after the transmission line quality had recovered to a certain level. Moreover, in this case, since the rXi recognizes that the transmission path has recovered more reliably and then switches back, the transmission path failure may fluctuate near the input signal disconnection, or the transmission path quality may fluctuate near the threshold value, causing AIS. To prevent signal switching and switching back from being repeated, a protection time was provided for switching back.
すなわち−度入力異常を検出してAIS信号に切替えた
後に人力異常が解除され一定の保護時間内に再度入力異
常が発生せずかつ伝送路品質がある一定以上であれば伝
送路を切戻す方式となっていた。In other words, after detecting an input abnormality and switching to an AIS signal, the manual abnormality is canceled, and if the input abnormality does not occur again within a certain protection time and the transmission path quality is above a certain level, the transmission path is switched back. It became.
しかし、このような従来の回線切替方式では、伝送路の
障害により信号が断になると障害地点以降の全中間中継
器ではほぼ同時に入力信号断となり、入力異常を検出し
た各中間中継器の出力はAIS信号に切替わる。障害中
継区間の受信側の中間中継器では障害が回復するまでA
IS信号を送出し続けそれ以降の正常状態の中継区間の
中間中継器では一つ前の中間中継器のAIS信号を受信
し、フレーム同期をとった後に上述したような保護時間
Tgの後に口中間中継器内部から発出しているAIS信
号に替わって前の中間中継器から受信したAIS信号を
中継して送出する。なお、ここで障害発生は上述の1ケ
所のみの場合を考えておりその他の中継区間に関しては
全く障害はなく正常なものと仮定しているために各中間
中継器の入力信号が一度断になった後にAIS信号を入
力してこれを送出するまでの時間はTgと考えてよい。However, in such conventional line switching systems, when the signal is cut off due to a failure in the transmission path, the input signal is cut off almost simultaneously at all intermediate repeaters after the point of failure, and the output of each intermediate repeater that detects the input abnormality is Switch to AIS signal. The intermediate repeater on the receiving side of the faulty relay section will use A until the fault is recovered.
After continuing to send IS signals, the intermediate repeater in the relay section in the normal state receives the AIS signal from the previous intermediate repeater, establishes frame synchronization, and then transmits the AIS signal after the protection time Tg described above. Instead of the AIS signal emitted from inside the repeater, the AIS signal received from the previous intermediate repeater is relayed and sent out. Note that here we are considering the case where a failure occurs only at the one location mentioned above, and we assume that there is no failure at all in the other relay sections and that they are normal, so the input signal to each intermediate repeater is interrupted once. The time from when the AIS signal is input until it is sent out can be considered Tg.
実際に通常は保護時間Tgはフレーム同期回復時間より
十分に長い時間に設定されている。Actually, the protection time Tg is normally set to a time sufficiently longer than the frame synchronization recovery time.
障害中継区間の受信側の中間中継器を中間中継器1とし
それ以降接続されている中間中継器を順次中間中継器2
、中間中継器3、中間中継器4とすると、中間中継器2
では人力異常を検出してから中間中継器1からのAIS
信号を受信して送信するまで上述したように約Tgの時
間を要す。ところが中間中継器3では中間中継器2から
のAIS信号を受信してフレーム同期をとり保護時間T
gとの後に中間中継器4へ送出するが、このとき中間中
継器2の送出するAIS信号が中間中継器2の内部から
送出しているAIS信号から中間中継器1から送出して
いるAIS信号に切替ったときに中間中継器3では同期
はずれをおこし入力異常となり送出信号が内部からのA
IS信号に切替り、この後に人力AIS信号のフレーム
同期をとり保護持間Tgの後に切戻しをかける。したが
って中間中継器3では人力異常検出後中間中継器1から
のAIS信号を送出して安定するまで約2Tgの時間を
要す。上述した現象は後続の中間中継器にも当てはまり
中間中継器n (n=2.3.4.5、)では安定する
までに最大で約(n−1) ・Tgの時間を要する。The intermediate repeater on the receiving side of the failed relay section is set as intermediate repeater 1, and the intermediate repeaters connected thereafter are sequentially set as intermediate repeater 2.
, intermediate repeater 3, intermediate repeater 4, intermediate repeater 2
Then, after detecting a human error, AIS from intermediate repeater 1
As mentioned above, it takes about Tg from receiving the signal to transmitting it. However, intermediate repeater 3 receives the AIS signal from intermediate repeater 2, synchronizes the frame, and maintains the protection time T.
g, and then sent to the intermediate repeater 4, but at this time, the AIS signal sent from the intermediate repeater 2 changes from the AIS signal sent from inside the intermediate repeater 2 to the AIS signal sent from the intermediate repeater 1. When switching to , intermediate repeater 3 loses synchronization, an input error occurs, and the output signal becomes A from the internal
The signal is switched to the IS signal, and then the frame synchronization of the AIS signal is performed manually, and the switch is switched back after the protection interval Tg. Therefore, it takes approximately 2 Tg for the intermediate repeater 3 to send out the AIS signal from the intermediate repeater 1 and stabilize after detecting a manual abnormality. The above-mentioned phenomenon also applies to subsequent intermediate repeaters, and intermediate repeater n (n=2.3.4.5) requires a maximum of approximately (n-1)·Tg to stabilize.
一般に保護時間Tgはフレーム同期回復時間に比して十
分長い時間に設定されるために、nが十分大きいときに
は(n−1) ・Tgは十分に長い時間となる。障害
中継区間の障害が後続の中継区間に波及しないための各
中間中継器よりのAIS信号送出であるのに過渡的には
上述の障害が波及し端局中継器で受信する信号は最大(
n−1) ・Tgの時間不安定の状態となる。このこ
とはひとつの中間中継器が極く短い入力異常を検出して
も受信側の端局中継器においては入力異常の起きる時間
幅が(n−1) ・Tgに拡大されることを意味して
おり、端局中継器はこのような不安定な受信信号に基づ
いて入力信号の異常を検出して切替要求信号を送出する
ために誤動作の生じる欠点があった。Generally, the protection time Tg is set to a sufficiently long time compared to the frame synchronization recovery time, so when n is sufficiently large, (n-1) Tg becomes a sufficiently long time. Although the AIS signal is sent from each intermediate repeater to prevent the fault in the faulty relay section from spreading to the subsequent repeater sections, the above-mentioned fault spreads transiently and the signal received by the end station repeater reaches the maximum (
n-1) - Tg becomes unstable over time. This means that even if one intermediate repeater detects an extremely short input abnormality, the time width in which the input abnormality occurs will be expanded to (n-1) Tg at the terminal repeater on the receiving side. The end station repeater detects an abnormality in the input signal based on such an unstable received signal and sends out a switching request signal, which has the disadvantage of causing malfunctions.
本発明は上記の欠点を解決するもので、端局中継器が人
力異常の検出を確実に行うことができ現用系から予備系
への回線切替が誤動作なく行える回線切替方式を提供す
ることを目的とする。The present invention solves the above-mentioned drawbacks, and aims to provide a line switching method in which a terminal repeater can reliably detect manual abnormalities and can switch lines from the active system to the protection system without malfunction. shall be.
本発明は、回線切替方式において、現用系の各端局中継
局はそれぞれ、入力信号の異常を検出して切替要求信号
を出力する手段を含み、現用系の各中間中継器はそれぞ
れ、切替制御信号を受信したときに入力信号の異常を検
出している場合には余剰ビットに監視制御信号を含む所
定のパタン信号を回線切替後に送出する手段を含むこと
を特徴とする。The present invention provides a line switching system in which each terminal relay station in the working system includes means for detecting an abnormality in an input signal and outputs a switching request signal, and each intermediate repeater in the working system controls switching. The present invention is characterized in that it includes means for transmitting a predetermined pattern signal including a supervisory control signal in surplus bits after switching the line if an abnormality in the input signal is detected when the signal is received.
現用系の端局中継局は入力信号に異常を検出したときに
自端局の回線切替器に切替要求信号を与える。回線切替
器はこの切替要求信号に従って監視制御信号として切替
制御信号を自端局の端局中継器に出力し伝送路および中
間中継器を経由して他端層に送信する。回線切替器は切
替要求信号または他端層からの切替制御信号に基づいて
現用系と予備系との切替を行う。現用系の中間中継器は
切替制御信号を受信したとき入力信号の異常を検出して
いる場合には回線切替後に余剰ビットに監視制御信号を
含む所定のパタン信号(A I S信号)を伝送路に送
出する。以上の動作により端局中継局は入力信号の検出
を確実に行うことができ、回線切替を誤動作なく行うこ
とができる。When the active terminal relay station detects an abnormality in the input signal, it provides a switching request signal to the line switching device of its own terminal station. In accordance with this switching request signal, the line switching device outputs a switching control signal as a supervisory control signal to the terminal repeater of its own terminal station, and transmits it to the other end layer via the transmission path and intermediate repeater. The line switch performs switching between the working system and the protection system based on a switching request signal or a switching control signal from the other end layer. When the active intermediate repeater receives the switching control signal, if it detects an abnormality in the input signal, it sends a predetermined pattern signal (AIS signal) containing the supervisory control signal to the surplus bits on the transmission path after switching the line. Send to. Through the above operations, the terminal relay station can reliably detect the input signal and can perform line switching without malfunction.
本発明の実施例について図面を参照して説明する。図は
本発明一実施例回線切替制御装置のブロック構成図であ
る。図において、回線切替制御装置は、現用系および予
備系の二つの端局中継器20.30および現用系および
端局中継器と予備系の端局中継器とを切替えて局内伝送
路βに接続する回線切替器11を含む対向する二つの端
局10..10.と、対向する端局中継器20.30の
間に伝送路を介して接続された複数個の中間中継器40
.50とを備え、端局中継器10および中間中継器40
.50はそれぞれ、伝送路符号の余剰ビットを用いて監
視制御信号を挿入および分岐して送受信する手段として
監視制御インクフェイス回路21.31.41.51を
含み、中間中継器40.50は中間中継回路42.43
.52.53を含み、回線切替器11は、自端局の現用
系の端局中継器20(または端局中継器30)の切替要
求信号Aに基づいてこの端局中継器20(または端局中
継器30)に監視制御信号として切替制御信号Bを与え
る手段と、この切替要求信号Aまたは他端層の切替要求
信号已に基づいて現用系と予備系とを切替える手段を含
む。Embodiments of the present invention will be described with reference to the drawings. The figure is a block configuration diagram of a line switching control device according to an embodiment of the present invention. In the figure, the line switching control device switches two end-office repeaters 20.30 for the working system and the standby system, and connects the working end-office repeater and the end-office repeater for the standby system to the intra-office transmission line β. Two opposing terminal stations 10. .. 10. and a plurality of intermediate repeaters 40 connected via transmission lines between the opposing terminal repeaters 20 and 30.
.. 50, a terminal repeater 10 and an intermediate repeater 40
.. Each of 50 includes supervisory control ink face circuits 21, 31, 41, and 51 as a means for inserting and branching supervisory control signals and transmitting/receiving them using surplus bits of the transmission line code, and intermediate repeaters 40, 50 are intermediate relays. Circuit 42.43
.. 52 and 53, and the line switching device 11 switches the current terminal station repeater 20 (or terminal station repeater 30) based on the switching request signal A of the active system terminal station repeater 20 (or It includes means for supplying a switching control signal B as a supervisory control signal to the repeater 30), and means for switching between the active system and the standby system based on the switching request signal A or the switching request signal of the other end layer.
ここで本発明の特徴とするところは、現用系の端局中継
器20(または端局中継器30)に、入力信号の異常を
検出して切替要求信号Aを出力する手段を含み、現用系
の各中間中継器40(または中間中継器50)は、切替
制御信号を受信したときに入力信号の異常を検出してい
る場合には余剰ビットに監視制御信号を含む所定のパタ
ン信号を回線切替後に送出する手段を含むことにある。Here, a feature of the present invention is that the terminal station repeater 20 (or terminal station repeater 30) of the working system includes means for detecting an abnormality in the input signal and outputting the switching request signal A. If each intermediate repeater 40 (or intermediate repeater 50) detects an abnormality in the input signal when receiving the switching control signal, it sends a predetermined pattern signal containing the supervisory control signal to the surplus bits to switch the line. The purpose of the present invention is to include means for transmitting the information later.
このような構成の回線切替装置の動作について説明する
。The operation of the line switching device having such a configuration will be explained.
図において、回線切替器11..112に接続されてい
る局内伝送路βI、R2は、回線切替器11..112
により現用系を構成する端局中継器21..212に接
続されているものとする。局内伝送路A’ 11の信号
は、回線切替器11.を経由して端局中継器20゜に入
力され、中間中継回路421〜423を通って端局中継
器202で受信され回線切替器112を経由して局内伝
送路β21に送出される。また同様に局内伝送路β22
の信号は回線切替SO2、端局中継器20□、中間中継
回路433.43□、434、端局中継器201および
回線切替器11.を経由して局内伝送路β12に送出さ
れる。In the figure, line switching device 11. .. The intra-office transmission lines βI and R2 connected to the line switch 11. .. 112
The end station repeater 21 constitutes the working system. .. 212. The signal on the intra-office transmission line A' 11 is transmitted to the line switch 11. The signal is inputted to the terminal repeater 20° via intermediate repeater circuits 421 to 423, received by the terminal repeater 202, and sent to the intra-office transmission line β21 via the line switch 112. Similarly, the intra-office transmission line β22
The signals of line switching SO2, terminal station repeater 20□, intermediate relay circuits 433, 43□, 434, terminal station repeater 201 and line switching device 11. The signal is sent to the intra-office transmission path β12 via the .
端局中継器112.112ではそれぞれ対向している監
視制御インクフェイス回路211.212を用いて端局
10..10□の監視制御信号の送受信を行い、同様に
各中間中継器40.〜403では監視制御インクフェイ
ス回路411〜413を用いて監視制御信号の分岐およ
び挿入を行い自局の監視制御信号の端局10..10□
への転送および受信を行う。回線切替器11..11□
はそれぞれ端局中継器20..202が入力異常を検出
した場合に送出する切替要求を受は端局中継器30.
、30゜および中間中継器501〜503で構成される
予(111系に局内伝送路p1.12との接続を切替え
る。The end station repeaters 112 and 112 each use opposing supervisory control ink face circuits 211 and 212 to connect the end station 10. .. Similarly, each intermediate repeater 40.10□ transmits and receives monitoring control signals. -403, the supervisory control ink face circuits 411-413 are used to branch and insert the supervisory control signal, and the supervisory control signal of the own station is sent to the terminal station 10. .. 10□
Transfer to and receive from. Line switch 11. .. 11□
are terminal repeaters 20. and 20. respectively. .. The terminal repeater 30.202 receives the switching request sent when the input abnormality is detected.
, 30° and intermediate repeaters 501 to 503 (the connection with the intra-office transmission line p1.12 is switched to the 111 system).
いま、中間中継回路42゜が人力異常を検出したとする
。この時点では中間中継回路422はAIS信号を送出
しないので、中間中継回路423および端局中継器20
2で人力異常を検出する。端局中継器20□では人力異
常を検出したことにより切替要求信号A 22を回線切
替器11□へ送出し、回線切替器11□は予備系への回
線切替えを行うとともに図で示した切替制御信号B22
を監視制御インクフェイス回路212に送出する。切替
制御信号B22は監視制御インタフェイス回路212、
端局中継器20□、中間中継回路423、中間中継回路
422、中間中継回路4211端局中継器20□を経由
して監視制御インタフェイス回路211 に送出され、
監視制御インクフェイス回路211 は復号して切替制
御信号C2□を得て回線切替器111 に送出する。切
替制御信号C2+を得た回線切替器11.は、局内伝送
路β1を現用系から予備系へ切替える。以上により現用
回線から予備回線への切替えが完了する。Suppose now that the intermediate relay circuit 42° detects a human power abnormality. At this point, the intermediate repeater circuit 422 does not send out the AIS signal, so the intermediate repeater circuit 423 and the terminal repeater 20
2 detects human power abnormalities. When the terminal repeater 20□ detects a manual abnormality, it sends a switching request signal A 22 to the line switching device 11□, and the line switching device 11□ switches the line to the backup system and performs the switching control shown in the figure. Signal B22
is sent to the monitoring control ink face circuit 212. The switching control signal B22 is sent to the supervisory control interface circuit 212,
The signal is sent to the supervisory control interface circuit 211 via the terminal repeater 20□, the intermediate relay circuit 423, the intermediate repeater circuit 422, the intermediate repeater circuit 4211, and the terminal repeater 20□.
The supervisory control ink face circuit 211 decodes and obtains the switching control signal C2□, and sends it to the line switch 111. The line switch 11 that received the switching control signal C2+. switches the intra-office transmission line β1 from the working system to the protection system. The above completes the switching from the working line to the protection line.
次に中間中継回路433.432.431 に各々接続
された監視制御インクフェイス回路41..4h、41
、でも切替制御信号B2□を復号し各々中間中継回路4
23.422.42.に送出する。Next, supervisory control ink face circuits 41 . .. 4h, 41
, but the switching control signal B2□ is decoded and each intermediate relay circuit 4
23.422.42. Send to.
切替制御信号B2□を受けた各中間中継回路421〜4
23から入力異常を検出している中間中継回路−・(こ
の場合は中間中継回路42..423’)のみ内蔵して
いるATS発生回路により発生されるAIS信号を回線
切替後に伝送路に送出する。Each intermediate relay circuit 421 to 4 that received the switching control signal B2□
The intermediate relay circuit detecting an input abnormality from 23 (in this case, the intermediate relay circuit 42..423') sends out the AIS signal generated by the built-in ATS generation circuit to the transmission line after switching the line. .
以上により回線が切替った後に入力信号異常を検出した
中間中継器および異常を検出した中間中継器の下位の中
間中継器の設置されている局の監視制御信号の端局への
転送が可能となる。As described above, after the line is switched, it is possible to transfer the supervisory control signal of the intermediate repeater that detected an input signal abnormality and the intermediate repeater below the intermediate repeater that detected the abnormality to the terminal station. Become.
また、現用回線が両方向とも障害が発生した場合のこと
を考慮し回線切替器からの切替信号を予備回線のたとえ
ば余剰ビットを利用して現用回線とともに2系列で伝送
し回線切替えを確実化することもできる。さらに中間中
継器は、切替制御信号を受信しなくても入力異常を検出
してからある一定時間後(たとえば回線切替に要する最
大時間より若干長い時間後)には必ずAIS信号へ切替
わるようにしておけば人力異常を検出した中間中継器が
AIS信号に切替わらないことを防止できる。In addition, in consideration of the case where a failure occurs in both directions of the working line, the switching signal from the line switching device is transmitted in two lines together with the working line using, for example, surplus bits on the protection line to ensure line switching. You can also do it. Furthermore, even if the intermediate repeater does not receive a switching control signal, it always switches to the AIS signal after a certain period of time (for example, slightly longer than the maximum time required for line switching) after detecting an input abnormality. By doing so, it is possible to prevent an intermediate repeater that detects a manual abnormality from switching to an AIS signal.
以上説明したように、本発明は、端局中継器が人力異常
の検出を確実に行うことができ、回線切替を誤動作なく
行うことができる優れた効果がある。As described above, the present invention has excellent effects in that the terminal repeater can reliably detect manual abnormalities and can perform line switching without malfunction.
図は本発明一実施例回線切替装置のブロック構成図。
101.102・・・端局、118.112・・・回線
切替器、20、.20□、30..30□・・・端局中
継器、401〜403.501〜503・・・中間中継
器、411〜41..51.〜513・・・監視制御イ
ンクフェイス回路、421〜423.43゜〜43..
52.〜52..53.〜53□・・・中間中継回路、
A2+s A22、A31、A32・・・切替要求信号
、B21、B2□、B31、B32、C2+、C2□、
C31、C3□・・・切替制御信号。The figure is a block configuration diagram of a line switching device according to an embodiment of the present invention. 101.102... terminal station, 118.112... line switch, 20, . 20□, 30. .. 30□...Terminal repeater, 401-403.501-503...Intermediate repeater, 411-41. .. 51. ~513...Monitoring control ink face circuit, 421~423.43°~43. ..
52. ~52. .. 53. ~53□・・・Intermediate relay circuit,
A2+s A22, A31, A32...Switching request signal, B21, B2□, B31, B32, C2+, C2□,
C31, C3□...Switching control signal.
Claims (1)
切替器を含む対向する二つの端局と、対向する端局中継
器の間に伝送路を介して接続された複数個の中間中継器
とを備え、上記端局中継器および上記中間中継器はそれ
ぞれ、伝送路符号の余剰ビットを用いて監視制御信号を
挿入および分岐して送受信する手段を含み、上記回線切
替器は、自端局の現用系の端局中継器の切替要求信号に
基づいてこの端局中継器に監視制御信号として切替制御
信号を与える手段と、この切替要求信号または他端局の
切替制御信号に基づいて現用系と予備系とを切替える手
段を含む回線切替方式において、 現用系の各端局中継局はそれぞれ、入力信号の異常を検
出して切替要求信号を出力する手段を含み、 現用系の各中間中継器はそれぞれ、切替制御信号を受信
したときに入力信号の異常を検出している場合には余剰
ビットに監視制御信号を含む所定のパタン信号を回線切
替後に送出する手段を含むことを特徴とする回線切替方
式。[Claims] 1. Two opposing terminal stations including two terminal station repeaters and a line switch for the working system and the protection system, and the opposing terminal station repeaters are connected via a transmission line. each of the terminal station repeater and the intermediate repeater includes means for inserting and branching a supervisory control signal using surplus bits of the transmission line code to transmit and receive the signal; The switching device includes a means for providing a switching control signal as a monitoring control signal to the terminal station repeater based on a switching request signal of the terminal station repeater in the active system of the own terminal station, and a means for providing a switching control signal as a monitoring control signal to the terminal station repeater based on the switching request signal of the terminal station repeater of the active system of the own terminal station, and a means for providing the switching control signal as a monitoring control signal to the terminal station repeater, In a line switching system including means for switching between a working system and a protection system based on a control signal, each terminal relay station of the working system includes means for detecting an abnormality in an input signal and outputting a switching request signal, Each intermediate repeater in the active system is provided with means for transmitting a predetermined pattern signal containing a supervisory control signal in surplus bits after line switching if an abnormality in the input signal is detected when receiving the switching control signal. A line switching method characterized by including:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6448388A JP2664925B2 (en) | 1988-03-17 | 1988-03-17 | Line switching method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6448388A JP2664925B2 (en) | 1988-03-17 | 1988-03-17 | Line switching method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01236840A true JPH01236840A (en) | 1989-09-21 |
JP2664925B2 JP2664925B2 (en) | 1997-10-22 |
Family
ID=13259509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6448388A Expired - Lifetime JP2664925B2 (en) | 1988-03-17 | 1988-03-17 | Line switching method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2664925B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04341028A (en) * | 1991-05-17 | 1992-11-27 | Nec Corp | Transmitter |
-
1988
- 1988-03-17 JP JP6448388A patent/JP2664925B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04341028A (en) * | 1991-05-17 | 1992-11-27 | Nec Corp | Transmitter |
Also Published As
Publication number | Publication date |
---|---|
JP2664925B2 (en) | 1997-10-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1321001C (en) | Transmission line switching system | |
GB2444170A (en) | Ethernet protection using a redundant link, with link up of a remote port being triggered using a "link status control mechanism". | |
JPH07264156A (en) | Fault detection system for synchronization communication network | |
KR100233261B1 (en) | Method of switching 1+1 line protection using remote defect indication | |
JPH01236840A (en) | Line switching system | |
JP2827735B2 (en) | Clock switching method | |
JPS58221534A (en) | Optical fiber communication system | |
JPH0653980A (en) | Order wire signal transmission system | |
JP2867865B2 (en) | Protection line switching control method | |
JPH01264427A (en) | System for switching transmission line | |
JP3436241B2 (en) | Redundant baseband unit in wireless communication device | |
JPS61292438A (en) | Loopback control system | |
JP2000196553A (en) | Transfer system for e1 byte of sdh transmitter and its terminal station device | |
JP2001119359A (en) | Transmission device | |
JPH02279034A (en) | Line switching device | |
JPS6390237A (en) | Data transfer line control system | |
JPS62284539A (en) | Loop network equipment | |
JPH0535931B2 (en) | ||
JPH0295031A (en) | Transmission line switching system | |
JPH0318378B2 (en) | ||
JPH1198075A (en) | Transmission line supervisory device | |
JPH01286632A (en) | Transmission path switching system | |
JPS58191560A (en) | Connecting system of common line signal in digital exchange | |
JPH09289492A (en) | Branching type optical communication device | |
JPH01229526A (en) | Line switching system |