JPH05292111A - Transmission line changeover method and device therefor - Google Patents

Transmission line changeover method and device therefor

Info

Publication number
JPH05292111A
JPH05292111A JP4085312A JP8531292A JPH05292111A JP H05292111 A JPH05292111 A JP H05292111A JP 4085312 A JP4085312 A JP 4085312A JP 8531292 A JP8531292 A JP 8531292A JP H05292111 A JPH05292111 A JP H05292111A
Authority
JP
Japan
Prior art keywords
path
path group
transmission
group
section
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
Application number
JP4085312A
Other languages
Japanese (ja)
Other versions
JP3156356B2 (en
Inventor
Yukio Nakano
幸男 中野
Masahiro Takatori
正浩 高取
Masahiro Ashi
賢浩 芦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP08531292A priority Critical patent/JP3156356B2/en
Publication of JPH05292111A publication Critical patent/JPH05292111A/en
Application granted granted Critical
Publication of JP3156356B2 publication Critical patent/JP3156356B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Detection And Prevention Of Errors In Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To apply a large capacity transmission line efficiently through multiplexing by adopting a network of a ring structure at a level of a path group and sending/receiving a control signal integrated in a path overhead for each ring between two points having a changeover switch so as to changeover the path groups. CONSTITUTION:Each section described below being a component of each node in a transmission network using an SDH selects a path level by easy control equal to that of a section level. That is, each of transmission line reception sections 3-1-3-4 terminates an SDH signal received from each of transmission lines 1-1-1-4 and gives the signal to a path connection section 9 in the unit of VC-3/4 and detects path group overhead information. Based on this information, a changeover control section 12 discriminates the selection of the path group and controls the control section 9 to select a path group and transmission line transmission sections 4-1-4-4 multiplex the VC-3/4 from the connection section 9 and send the resulting SDH signal to transmission lines 2-1-2-4. Thus, a large capacity transmission line is efficiently applied.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、同期多重ハイアラキを
用いた伝送ネットワークの伝送路の切替方法及び装置に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for switching transmission lines of a transmission network using synchronous multiplex hierarchy.

【0002】[0002]

【従来の技術】従来、SDHと呼ばれる同期多重ハイア
ラキを用いた伝送ネットワークの伝送路切替方法として
は、CCITT Recommendation G.783 "Characteristics of
Synchronous Digital Hierarchy (SDH) multiplexing
equipment functional blocks", Annex A "Multiplex S
ection Protection (MSP) protocol, commands and ope
ration", CCITT SG XV Report R 41, (August 1990) に
述べられているように、セクションレベルで予備伝送路
を設け、セクションオーバヘッド(SOH)に設けられ
た切替制御信号の制御によって現用伝送路と予備伝送路
との間で切替を行なう方法があった。セクションの終端
装置では、セクションAIS、フレーム同期はずれなど
のセクションレベルの障害を検出すると、対向するセク
ション終端装置との間でSOHに設けられたMSPバイ
トと呼ばれる切替制御信号の授受を行ない、伝送路の切
替を行なう。
2. Description of the Related Art Conventionally, CCITT Recommendation G.783 "Characteristics of SDH is used as a transmission path switching method of a transmission network using synchronous multiplex hierarchy.
Synchronous Digital Hierarchy (SDH) multiplexing
equipment functional blocks ", Annex A" Multiplex S
ection Protection (MSP) protocol, commands and ope
ration ", CCITT SG XV Report R 41, (August 1990), a backup transmission line is provided at the section level, and a switching control signal provided in the section overhead (SOH) controls the active transmission line. There was a method of switching to and from the backup transmission line.When the section terminating device detects a section level failure such as section AIS or loss of frame synchronization, it is provided in the SOH between the opposite section terminating device. A switching control signal called an MSP byte is exchanged to switch the transmission path.

【0003】また、非同期多重ハイアラキを用いた伝送
ネットワークの伝送路切替方法であり、パスレベルの切
替を行なう方法として、寺西、北村著「ディジタル網の
伝送施設設計」電気通信協会(昭和59年)の126ペ
ージから131ページに述べられているディジタル伝送
路網切替方式が知られている。この方法では、パスの切
替装置間に現用パスとは別の伝送路に予備パスを張る。
切替装置付近の装置で検出された伝送路障害は制御局に
置かれた制御装置に送られ、この制御装置が送られてき
た障害情報に基づいて切替装置を制御して現用パスと予
備パスとの間でパスを切り替える。
[0003] A transmission line switching method for a transmission network using asynchronous multiplex hierarchy, as a method for switching the path level, is described by Teranishi and Kitamura, "Designing Transmission Facilities for Digital Networks," Telecommunications Association (1984). There is known a digital transmission line network switching system described on pages 126 to 131 of the above. In this method, a backup path is provided between the path switching devices on a transmission path different from the working path.
The transmission path fault detected by the device near the switching device is sent to the control device placed in the control station, and the control device controls the switching device based on the sent fault information to determine the working path and the backup path. Switch the path between.

【0004】[0004]

【発明が解決しようとする課題】前記のMSPを用いた
SDHのセクションレベルの切替方法では、対向するセ
クション終端装置間に現用伝送路とは別に予備伝送路と
しての光ファイバを設置しなければならない。このた
め、ネットワーク全体として多くの光ファイバを必要と
する。
In the SDH section level switching method using the MSP described above, an optical fiber as a backup transmission line must be installed separately from the working transmission line between opposing section terminators. .. Therefore, many optical fibers are required for the entire network.

【0005】一方、ディジタル伝送路網切替方式では、
予備パスを他の現用パスと多重化することができるた
め、大容量伝送方式を効率良く適用でき、ネットワーク
全体の光ファイバの本数を少なくすることが可能であ
る。しかし、面的な切替制御を行なうために、制御局に
おいて集中制御を行なわなければならず、制御が複雑に
なる。
On the other hand, in the digital transmission line network switching system,
Since the backup path can be multiplexed with other working paths, the large capacity transmission method can be efficiently applied and the number of optical fibers in the entire network can be reduced. However, in order to perform the planar switching control, the control station must perform centralized control, which complicates the control.

【0006】本発明が解決しようとする課題は、SDH
を用いた伝送ネットワークにおいて、セクションレベル
と同等の容易な制御でパスレベルの切替を行ない、大容
量伝送路を効率良く適用できる伝送路切替方法及び装置
を実現することである。
The problem to be solved by the present invention is SDH
In a transmission network using the above, it is possible to realize a transmission line switching method and device capable of efficiently applying a large capacity transmission line by switching the path level with the same easy control as the section level.

【0007】[0007]

【課題を解決するための手段】上記課題を解決するた
め、本発明では、CCITT G.708の同期多重ハ
イアラキを用いた伝送ネットワーク内の複数のノードを
複数の光伝送路で結んだリング上に、バーチャルコンテ
ナ−レベル3(VC−3)のN倍(Nは正整数)で前記
光伝送路の容量の最小値より小さい容量のパスリングを
定義し、該パスリング内での経路が等しいVC−3及び
VC−4の該パスリング内の部分の集合を現用パスグル
ープと定義し、該現用パスグループと前記パスリング内
の始点と終点と容量が等しく該パスリング内の伝送経路
が該現用パスとは該パスリングの逆の方向であるパスグ
ループを予備パスグループと定義し、該現用パスグルー
プの信号内および該予備パスグループの信号内に設けら
れた切替制御信号の制御により該現用パスグループと該
予備パスグループの間で切替を行なう。
In order to solve the above problems, according to the present invention, CCITT G.K. On a ring formed by connecting a plurality of nodes in a transmission network using the synchronous multiplex hierarchy of 708 with a plurality of optical transmission lines, the optical container is multiplied by N times the virtual container level 3 (VC-3) (N is a positive integer). A path ring having a capacity smaller than the minimum value of the capacity of the transmission path is defined, and a set of portions in the path ring of VC-3 and VC-4 having the same route in the path ring is defined as a working path group, A path group whose capacity is equal to the start point and the end point in the working path group and the path ring and whose transmission path in the path ring is in the opposite direction of the working path from the working path is defined as a backup path group, and Switching is performed between the working path group and the protection path group by controlling the switching control signal provided in the signal of the working path group and the signal of the protection path group.

【0008】前記切替制御信号は、前記現用パスグルー
プを構成するVC−3及びVC−4のうちのひとつのV
C−3またはVC−4のパスオーバヘッド(POH)内
に設ける。
The switching control signal is one of V-3 of VC-3 and VC-4 which constitutes the working path group.
Provided in the path overhead (POH) of C-3 or VC-4.

【0009】前記切替制御信号内には、パスグループA
IS(PG−AIS)を指示するフラグを設け、パスグ
ループ始点において該PG−AISフラグを全マーク以
外の符号にし、該パスグループを含む伝送路に障害が発
生した場合に該障害検出点で該PG−AISフラグを全
マークに変更し、該パスグループ終点で該PG−AIS
フラグが全マークであった場合に前記現用パスグループ
と前記予備パスグループの間で切替を行なう。
In the switching control signal, the path group A
A flag indicating IS (PG-AIS) is provided, the PG-AIS flag is set to a code other than all marks at the start point of the path group, and when a failure occurs in the transmission path including the path group, the failure detection point The PG-AIS flag is changed to all marks, and the PG-AIS is set at the end point of the path group.
When the flags are all marks, switching is performed between the working path group and the protection path group.

【0010】[0010]

【作用】現用パスグループを構成するひとつのVC-3また
はVC-4(代表VC)がパスリングに入る装置、即ちパスグ
ループの始点において、このVC-3またはVC-4のPOHに定
義されたPG-AISフラグは、PG-AISオフを表す全0以外の
符号に設定される。このパスグループを含む伝送路に障
害が発生すると、この障害を検出した伝送装置のセクシ
ョン終端部は多重化されている信号を全1に変換する。
この結果、PG-AISフラグも全1となり、パスグループの
終点においてPG-AISとして検出される。パスグループ終
点では、PG-AISを検出すると、予備パスの代表VCのPOH
に定義された切替制御信号によってパスグループ始点に
切替指示信号を送る。パスグループ始点では、この切替
指示を受信するとパスグループ終点からパスグループ始
点の方向に伝送されるパスグループを現用パスから予備
パスに切り替えると同時に、予備パスの代表VCのPOHに
定義された切替制御信号によってパスグループ終点に切
替指示信号を返送する。パスグループ終点では、返送さ
れた切替指示信号を受信すると、パスグループ始点から
パスグループ終点の方向に伝送されるパスグループを現
用パスから予備パスに切り替える。
[Operation] A device in which one VC-3 or VC-4 (representative VC) forming the working path group enters the path ring, that is, the start point of the path group is defined in the POH of this VC-3 or VC-4. The PG-AIS flag is set to a code other than all 0s indicating PG-AIS off. When a failure occurs in the transmission path including this path group, the section termination unit of the transmission device that detects this failure converts the multiplexed signal into all ones.
As a result, the PG-AIS flag also becomes all 1, and is detected as PG-AIS at the end point of the path group. At the end of the path group, when PG-AIS is detected, the POH of the representative VC of the backup path
A switching instruction signal is sent to the path group start point by the switching control signal defined in 1. When the switching instruction is received at the path group start point, the path group transmitted from the path group end point to the path group start point is switched from the working path to the protection path, and at the same time, the switching control defined in the POH of the representative VC of the protection path. A switching instruction signal is returned to the end point of the path group by a signal. At the end of the path group, when the returned switching instruction signal is received, the path group transmitted in the direction from the start point of the path group to the end point of the path group is switched from the working path to the protection path.

【0011】[0011]

【実施例】本発明の実施例を、図1乃至図6を用いて説
明する。図2は、本発明の実施例におけるネットワーク
構成を示した図である。この図は、ネットワークをレベ
ル毎に表したものであり、低位のレベルより、セクショ
ン面30、VC-3/4パスグループ面40、VC-3/4パス面5
0とからなる。セクション面30は、ノード32−1〜
32−6と、これらをラダー状に相互に接続するセクシ
ョン伝送路31−1〜31−5とからなる。VC-3/4パス
グループ面40では、パスグループリング41−1〜4
1−4が定義される。例えば、パスグループ41−2
は、セクション31−1〜31−4より帯域の一部を切
り出してリング状に設定したものである。VC-3/4パス面
50では、VC-3/4パスが任意の装置間に張られ、複数の
パスグループのリングを通過する。例えば、VC-3パス5
1−1は、ノード32−1とノード32−6との間に張
られ、パスグループリング41−2と41−3を経由し
ている。
Embodiments of the present invention will be described with reference to FIGS. FIG. 2 is a diagram showing a network configuration in the embodiment of the present invention. This figure shows the network for each level. From the lower level, the section plane 30, VC-3 / 4 path group plane 40, VC-3 / 4 path plane 5
It consists of 0 and. The section surface 30 is a node 32-1.
32-6, and section transmission lines 31-1 to 31-5 connecting these to each other in a ladder shape. On the VC-3 / 4 path group plane 40, path group rings 41-1 to 4-4
1-4 are defined. For example, the path group 41-2
Shows that a part of the band is cut out from the sections 31-1 to 31-4 and set in a ring shape. On the VC-3 / 4 path plane 50, a VC-3 / 4 path is stretched between arbitrary devices and passes through the rings of a plurality of path groups. For example, VC-3 pass 5
1-1 is provided between the node 32-1 and the node 32-6, and passes through the path group rings 41-2 and 41-3.

【0012】図1は、図2のノード32−1〜32−6
の構成を示したものである。このノードは、伝送路1−
1〜1−4から受信したSDH信号を終端する伝送路受信
部3−1〜3−4、終端されたSDH信号をVC-3/4単位に
接続するパス接続部9、伝送路受信部3−1〜3−4に
おいて検出されたパスグループオーバヘッド情報に基づ
いてパスグループ切り替えの判断を行いパス接続部9を
制御する切り替え制御部12、パス接続部からのVC-3/4
を多重化して伝送路2−1〜2−4にSDH信号を送出す
る伝送路送信部4−1〜4−4とからなる。伝送路受信
部3−1〜3−4は、SDHのセクションオーバヘッドの
終端を行うセクション終端部受信側5−1〜5−4、パ
スグループの終端を行いパスグループ情報を制御バス2
0に送出するパスグループ終端部受信側6−1〜6−4
とからなる。パス接続部9は、パスのクロスコネクトと
切り替えを行うパス接続スイッチ10、パス接続スイッ
チの接続情報を管理するスイッチ制御部11とからな
る。伝送路送信部4−1〜4−4は、パスグループオー
バヘッドの書き込みを行うパスグループ終端部送信側7
−1〜7−4、セクションオーバヘッドの書き込みを行
うセクション終端部送信側8−1〜8−4とからなる。
FIG. 1 shows nodes 32-1 to 32-6 of FIG.
Shows the configuration of. This node is a transmission line 1-
Transmission line receivers 3-1 to 3-4 that terminate SDH signals received from 1-1 to 1-4, path connection unit 9 that connects the terminated SDH signals in VC-3 / 4 units, and transmission line receiver 3 -1 to 3-4, the switching control unit 12 that determines the path group switching based on the path group overhead information and controls the path connection unit 9, and VC-3 / 4 from the path connection unit
And transmission path transmission units 4-1 to 4-4 for multiplexing and transmitting SDH signals to the transmission paths 2-1 to 2-4. The transmission line receiving units 3-1 to 3-4 are section end receiving units 5-1 to 5-4 for terminating the SDH section overhead, and are for terminating the path group and for transmitting the path group information to the control bus 2.
Path group terminal end receiving side 6-1 to 6-4
Consists of. The path connection unit 9 includes a path connection switch 10 that performs cross-connection and switching of paths, and a switch control unit 11 that manages connection information of the path connection switch. The transmission path transmitters 4-1 to 4-4 are the path group termination unit transmitters 7 that write the path group overhead.
-1 to 7-4, and section end section transmission sides 8-1 to 8-4 for writing the section overhead.

【0013】図6は、SDHにおけるSTM-Nのフレーム構成
を示す。VC-3(100)のパスオーバヘッド101のZ3バイ
トをパスグループオーバヘッドとする。
FIG. 6 shows the frame structure of STM-N in SDH. The Z3 byte of the path overhead 101 of VC-3 (100) is used as the path group overhead.

【0014】図3は、本実施例の通常運用時におけるパ
スルートを示す。VC-3パス51−1を含む現用パスグル
ープはパスグループリング41−2内では右回りに設定
され、予備パスグループ51−3が左回りに設定され
る。ノード32−1のパスグループ終端部送信側では、
VC-3パス51−1のパスオーバヘッドのZ3バイトに設け
られたPG-AISビットを0にしてパスグループリング41
−2に送出する。ノード32−5では、PG-AISビットが
0として検出されるため、パスグループリング41−2
内の現用パスグループの正常性が確認される。
FIG. 3 shows a path route during normal operation of this embodiment. The working path group including the VC-3 path 51-1 is set clockwise in the path group ring 41-2, and the backup path group 51-3 is set counterclockwise. On the transmission side of the path group termination unit of the node 32-1,
The path group ring 41 is set by setting the PG-AIS bit provided in the Z3 byte of the path overhead of the VC-3 path 51-1 to 0.
-2. Since the PG-AIS bit is detected as 0 in the node 32-5, the path group ring 41-2
The normality of the working path group in is confirmed.

【0015】図4は、本実施例の障害発生時におけるパ
スルートを示す。図5は、これに対応する切り替え制御
情報のフローを表す。伝送路32−1で障害が発生する
と、ノード32−2のセクション終端部受信側で伝送路
障害が検出され、このセクションに多重化されている全
VCの内容を全1に変換する。従って、伝送装置32−5
では、PG-AISビットが1として検出され、パスグループ
リング41−2内の現用パスグループで障害が発生して
いることが検出される。この情報は、ノード32−5の
切り替え制御部12に送られる。ノード32−5の切り
替え制御部12では、切り替え制御情報の一つであるSi
gnal Failure(SF)を送出するようにパスグループ終端部
送信側に指示する。ノード32−5のパスグループ終端
部送信側では、予備パスグループが張られている方向の
ノード32−4に向かって、VC-3のPOHに設けられた切
り替え制御情報転送領域にSFの符号を書き込んで送出す
る。ノード32−4はパスグループ41−2の終端点で
はないため、SFを通過させ、ノード32−1に送る。ノ
ード32−1のパスグループ終端部受信部では、受信し
たSFを切り替え制御部12に送る。ノード32−1の切
り替え制御部12では、SFを検出するとスイッチ制御部
11にパスグループの接続変更を指示し、スイッチ制御
部11がパス接続スイッチを制御してパスグループを現
用から予備に切り替える。ノード32−1の切り替え制
御部12は、同時に、切り替え制御情報の一つであるRe
vers Request(RR)を送出するようにパスグループ終端部
送信側に指示する。ノード32−1のパスグループ終端
部送信側では、予備パスグループが張られている方向の
ノード32−4に向かって、VC-3のPOHに設けられた切
り替え制御情報転送領域にRRの符号を書き込んで送出す
る。ノード32−4はパスグループ41−2の終端点で
はないため、RRを通過させ、ノード32−5に送る。ノ
ード32−5のパスグループ終端部受信部では、受信し
たRRを切り替え制御部12に送る。ノード32−5の切
り替え制御部12では、RRを検出するとスイッチ制御部
11にパスグループの接続変更を指示し、スイッチ制御
部11がパス接続スイッチを制御してパスグループを現
用から予備に切り替える。これにより、双方向のパスグ
ループの予備系から現用系への切り替えが完了する。
FIG. 4 shows a path route when a failure occurs in this embodiment. FIG. 5 shows the flow of switching control information corresponding to this. When a failure occurs in the transmission path 32-1, a failure in the transmission path is detected at the section end section receiving side of the node 32-2, and all the sections multiplexed in this section are detected.
Convert the contents of VC to all ones. Therefore, the transmission device 32-5
Then, the PG-AIS bit is detected as 1, and it is detected that a failure has occurred in the working path group in the path group ring 41-2. This information is sent to the switching control unit 12 of the node 32-5. In the switching control unit 12 of the node 32-5, Si which is one of the switching control information
Instruct the sender of the path group termination section to send a gnal Failure (SF). On the transmission side of the path group termination unit of the node 32-5, the SF code is assigned to the switching control information transfer area provided in the POH of the VC-3 toward the node 32-4 in the direction in which the backup path group is set up. Write and send. Since the node 32-4 is not the termination point of the path group 41-2, the SF is passed and sent to the node 32-1. The path group termination unit reception unit of the node 32-1 sends the received SF to the switching control unit 12. When the SF is detected, the switching control unit 12 of the node 32-1 instructs the switch control unit 11 to change the connection of the path group, and the switch control unit 11 controls the path connection switch to switch the path group from the working to the protection. At the same time, the switching control unit 12 of the node 32-1 is Re which is one of the switching control information.
Instruct the sender of the path group termination unit to send a vers Request (RR). On the transmission side of the path group termination unit of the node 32-1, toward the node 32-4 in the direction in which the backup path group is set, the RR code is placed in the switching control information transfer area provided in the POH of the VC-3. Write and send. Since the node 32-4 is not the termination point of the path group 41-2, it passes the RR and sends it to the node 32-5. The path group termination unit reception unit of the node 32-5 sends the received RR to the switching control unit 12. When the RR is detected, the switching control unit 12 of the node 32-5 instructs the switch control unit 11 to change the connection of the path group, and the switch control unit 11 controls the path connection switch to switch the path group from the working to the protection. This completes the switching of the bidirectional path group from the backup system to the working system.

【0016】[0016]

【発明の効果】本発明では、パスグループのレベルでリ
ング構造のネットワークとし、リング毎にパスオーバヘ
ッドに組み込まれた制御信号を切り替えスイッチのある
2点間で授受することで切り替えを行っているため、容
易な制御で伝送路の切り替えができる。又、予備経路は
のパスグループのレベルで設定されるため、予備のパス
グループと他の現用パスグループとを多重化して伝送す
ることが可能であるため、大容量伝送路を効率よく適用
することができる。
According to the present invention, a network having a ring structure is formed at the level of a path group, and switching is performed by exchanging a control signal incorporated in the path overhead for each ring between two points having a changeover switch. The transmission path can be switched with easy control. Also, since the backup path is set at the level of the path group of, it is possible to multiplex and transfer the backup path group and other working path groups, and therefore, it is possible to efficiently apply the large capacity transmission path. You can

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例における伝送装置の構成図FIG. 1 is a configuration diagram of a transmission device according to an embodiment of the present invention.

【図2】本発明の実施例におけるネットワーク構成図FIG. 2 is a network configuration diagram according to an embodiment of the present invention.

【図3】本発明の実施例における通常運用時のパスルー
ト説明図
FIG. 3 is an explanatory diagram of a path route during normal operation according to the embodiment of this invention.

【図4】本発明の実施例における障害発生時のパスルー
ト説明図
FIG. 4 is an explanatory diagram of a path route when a failure occurs in the embodiment of the present invention.

【図5】本発明の実施例における切り替えフロー説明図FIG. 5 is an explanatory diagram of a switching flow according to the embodiment of the present invention.

【図6】STM-Nフレーム構成図[Figure 6] STM-N frame configuration diagram

【符号の説明】[Explanation of symbols]

1−1〜1−4:伝送路、3−1〜3−4:伝送路受信
部、9:パス接続部、12:切り替え制御部、4−1〜
4−4:伝送路送信部、5−1〜5−4:セクション終
端部受信側、6−1〜6−4:パスグループ終端部受信
側、10:パス接続スイッチ、11:スイッチ制御部、
7−1〜7−4:パスグループ終端部送信側、8−1〜
8−4:セクション終端部送信側。
1-1 to 1-4: transmission line, 3-1 to 3-4: transmission line receiving unit, 9: path connecting unit, 12: switching control unit, 4-1 to 4-1
4-4: transmission line transmission unit, 5-1 to 5-4: section termination unit reception side, 6-1 to 6-4: path group termination unit reception side, 10: path connection switch, 11: switch control unit,
7-1 to 7-4: Path group termination unit transmission side, 8-1 to
8-4: Sending section end section.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】CCITT G.708の同期多重ハイア
ラキを用いた伝送ネットワークの伝送路切替方法であっ
て、該伝送ネットワーク内の複数のノードを複数の光伝
送路で結んだリング上に、バーチャルコンテナ−レベル
3(VC−3)のN倍(Nは正整数)で前記光伝送路の
容量の最小値より小さい容量のパスリングを定義し、該
パスリング内での経路が等しいVC−3及びVC−4の
該パスリング内の部分の集合を現用パスグループと定義
し、該現用パスグループと前記パスリング内の始点と終
点と容量が等しく該パスリング内の伝送経路が該現用パ
スとは該パスリングの逆の方向であるパスグループを予
備パスグループと定義し、該現用パスグループの信号内
および該予備パスグループの信号内に設けられた切替制
御信号の制御により該現用パスグループと該予備パスグ
ループの間で切替を行なう伝送路切替方法。
1. CCITT G.M. 708. A transmission path switching method for a transmission network using the synchronous multiplex hierarchy of 708, wherein a virtual container-level 3 (VC-3) is provided on a ring connecting a plurality of nodes in the transmission network with a plurality of optical transmission paths. A path ring having a capacity smaller than the minimum value of the capacity of the optical transmission line by N times (N is a positive integer) Is defined as a working path group, and the starting path and the ending point in the working path group and the path ring have the same capacity, and the transmission path in the path ring is in the opposite direction of the working path from the working path. A certain path group is defined as a protection path group, and the working path group and the protection path are controlled by controlling a switching control signal provided in the signal of the working path group and the signal of the protection path group. Transmission line switching method for switching between the scan group.
【請求項2】前記切替制御信号は、前記現用パスグルー
プを構成するVC−3及びVC−4のうちのひとつのV
C−3またはVC−4のパスオーバヘッド(POH)内
に設けられた切替制御信号である請求項1記載の伝送路
切替方法。
2. The switching control signal is a V of one of VC-3 and VC-4 that constitute the working path group.
The transmission line switching method according to claim 1, wherein the transmission control signal is a switching control signal provided in a path overhead (POH) of C-3 or VC-4.
【請求項3】前記切替制御信号内には、パスグループA
IS(PG−AIS)を指示するフラグを設け、パスグ
ループ始点において該PG−AISフラグを全マーク以
外の符号にし、該パスグループを含む伝送路に障害が発
生した場合に該障害検出点で該PG−AISフラグを全
マークに変更し、該パスグループ終点で該PG−AIS
フラグが全マークであった場合に前記現用パスグループ
と前記予備パスグループの間で切替を行なう請求項2記
載の伝送路切替方法。
3. The path group A is included in the switching control signal.
A flag indicating IS (PG-AIS) is provided, the PG-AIS flag is set to a code other than all marks at the start point of the path group, and when a failure occurs in the transmission path including the path group, the failure detection point The PG-AIS flag is changed to all marks, and the PG-AIS is set at the end point of the path group.
The transmission line switching method according to claim 2, wherein when the flags are all marks, switching is performed between the working path group and the protection path group.
【請求項4】SDHのセクションオーバヘッドの終端を行
うセクション終端部受信側、パスグループ終端部受信
側、終端されたSDH信号をVC-3/4単位に接続するパス接
続部、伝送路受信部において検出されたパスグループオ
ーバヘッド情報に基づいてパスグループ切り替えの判断
を行いパス接続部を制御する切り替え制御部、パスグル
ープオーバヘッドの書き込みを行うパスグループ終端部
送信側、セクションオーバヘッドの書き込みを行うセク
ション終端部送信側とから構成される伝送路切替装置。
4. A section terminal section receiving side for terminating SDH section overhead, a path group terminal section receiving side, a path connecting section for connecting a terminated SDH signal in VC-3 / 4 units, and a transmission line receiving section. A switching control unit that determines the path group switching based on the detected path group overhead information and controls the path connection unit, a path group termination unit that writes the path group overhead, a transmission side unit, and a section termination unit that writes the section overhead. A transmission path switching device composed of a transmission side.
JP08531292A 1992-04-07 1992-04-07 Transmission line switching method and apparatus Expired - Fee Related JP3156356B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP08531292A JP3156356B2 (en) 1992-04-07 1992-04-07 Transmission line switching method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08531292A JP3156356B2 (en) 1992-04-07 1992-04-07 Transmission line switching method and apparatus

Publications (2)

Publication Number Publication Date
JPH05292111A true JPH05292111A (en) 1993-11-05
JP3156356B2 JP3156356B2 (en) 2001-04-16

Family

ID=13855092

Family Applications (1)

Application Number Title Priority Date Filing Date
JP08531292A Expired - Fee Related JP3156356B2 (en) 1992-04-07 1992-04-07 Transmission line switching method and apparatus

Country Status (1)

Country Link
JP (1) JP3156356B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
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
US6023452A (en) * 1996-05-20 2000-02-08 Nec Corporation Network failure restoration method with different recovery performances for different signal groups
JP2009296371A (en) * 2008-06-05 2009-12-17 Nippon Telegr & Teleph Corp <Ntt> Packet switch type optical transmission system

Cited By (4)

* Cited by examiner, † Cited by third party
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
US6023452A (en) * 1996-05-20 2000-02-08 Nec Corporation Network failure restoration method with different recovery performances for different signal groups
JP2009296371A (en) * 2008-06-05 2009-12-17 Nippon Telegr & Teleph Corp <Ntt> Packet switch type optical transmission system

Also Published As

Publication number Publication date
JP3156356B2 (en) 2001-04-16

Similar Documents

Publication Publication Date Title
US5406401A (en) Apparatus and method for selective tributary switching in a bidirectional ring transmission system
CA2065471C (en) System for squelching communications circuits terminating in failed ring nodes
EP0573217B1 (en) Dual hubbing in a bidirectional line-switched ring transmission system
EP0573211B1 (en) Distributed switching in bidirectional multiplex section-switched ring transmission systems
US5974027A (en) Telecommunications network including a channel switching protection arrangement
EP0890234B1 (en) Transport interface for performing protection switching of telecommunications traffic
EP0654922B1 (en) Communication system having interconnected line-switched and path-switched ring transmission systems
CA2130067C (en) Ring interworking between bidirectional line-switched ring transmission systems
US5440540A (en) Ring interworking between a bidirectional line-switched ring transmission system and another ring transmission system
US5467344A (en) Packet data transmission with asynchronous bandwidth switching
JP2988440B2 (en) Terminal equipment
JPH05292111A (en) Transmission line changeover method and device therefor
JP3233332B2 (en) Transmission equipment
KR100298968B1 (en) Generalized Deterministic Squenching of Ring Transfer Systems
JPH098762A (en) Repeater
KR0171765B1 (en) Board switching method of lsmb
JP2679604B2 (en) Switching information transfer method and transfer transmission line conversion circuit
JP2000224211A (en) Sdh network
JP2677198B2 (en) Wireless communication system
KR0171764B1 (en) Circuit switching method of lsmb
JPH05316133A (en) Monitor control system
KR0171763B1 (en) Order line route method using fi byte in a synchronous transmission apparatus

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees