WO2004010644A1 - Procede pour proteger un service de couche superieure dans un equipement de communication multicouche - Google Patents
Procede pour proteger un service de couche superieure dans un equipement de communication multicouche Download PDFInfo
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- WO2004010644A1 WO2004010644A1 PCT/CN2003/000573 CN0300573W WO2004010644A1 WO 2004010644 A1 WO2004010644 A1 WO 2004010644A1 CN 0300573 W CN0300573 W CN 0300573W WO 2004010644 A1 WO2004010644 A1 WO 2004010644A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
Definitions
- the present invention relates to a method for protecting high-level services in multi-layer communication equipment in the field of communications, and in particular, to providing bypass connection protection for asynchronous transmission mode (UTM) services in a multi-service provisioning platform (MSPP) and a multi-service transmission node (MSTP). method.
- UDM synchronous transmission mode
- MSPP multi-service provisioning platform
- MSTP multi-service transmission node
- the protection of communication network services is achieved through the same level of alternative routing in communication equipment, such as automatic protection switching in SDH and ATM (see ITU-T G, 841 and I. 630).
- the characteristics of these protection methods are to provide two paths for the specific service at the same level of communication equipment, namely the working path and the protection path.
- the working path is used to transmit services, and when the working path fails, the protection path is used to transmit.
- the switching between the service, working path and protection path is performed by the nodes adjacent to the fault location or the nodes affected by the fault.
- the above method requires multiple nodes to participate in implementing the protection operation, and even needs to negotiate between related nodes, which is more complicated to implement and affects efficiency and stability.
- ATM services are provided by ATM processing modules.
- the main functions of ATM processing modules are: download ATM services from other nodes on the subnet to this node; upload ATM services from this node to other nodes on the subnet Services, in fact, the ATM service processing module of a node does not process ATM services between other nodes on the subnet.
- the ATM processing module only loses the functions of downloading and uploading ATM services related to this node when a fault occurs, and does not affect services between other nodes. Similar problems exist in other multi-layer network equipment. Therefore, if the traditional ATM service protection method is adopted, the ATM processing module and the SDH processing module in MSPP are regarded as independent devices and cannot be used to their full advantage.
- the technical problem to be solved by the present invention is to propose a method for protecting high-level services in multi-layer communication equipment.
- the method overcomes the shortcomings that the prior art requires multiple nodes to participate in the protection operation of the ATM service in the multi-service provisioning platform (MSPP) and the multi-service transmission node (MSTP), and solves the problem of low-level processing modules in multi-layer network equipment. Issues protecting high-level business.
- a method for protecting a high-level service in a multi-layer communication device includes the following processing steps: In a first step, a low-level processing module provides a low-level transmission channel for the high-level processing module;
- the high-level processing module extracts and inserts the high-level services of the node from the low-level transmission channel, and allows the services between the upstream node and the downstream node to pass through the high-level processing module of the node without affecting its business content; for ATM services, it is established Cross-connections that do not change the virtual channel identifier / virtual channel identifier VPI / VCI are hereinafter referred to as transparent VP connections;
- the high-level processing module notifies the low-level processing module after detecting the failure of the module, and the notification method may be a software message or a hardware signal;
- the low-level processing module detects a fault in the high-level processing module and establishes a bypass connection to isolate the faulty high-level processing module.
- the detection of the failure of the high-level processing module by the low-level processing module further includes determining whether a service signal transmitted by the high-level processing module is invalid or detecting a hardware signal or a software message sent by the high-level processing module to report the failure; the bypass connection may be an actual physical
- the line connection can also be a logical connection inside a low-level processing module (such as the SDH channel in MSPP).
- the present invention is mainly aimed at effective protection of ATM services when the ATM layer processing function fails in the multi-service provisioning platform MSPP and the multi-service transmission node MSTP; the present invention solves the problem that other nodes of the network cross the node during equipment maintenance Business impact issues.
- the protection operation of the present invention is completed at a node that has a fault, and only affects services above and below the node. If multiple nodes fail at the same time, each failed node can be protected separately without affecting each other.
- the invention can also isolate multiple points of failure, and can effectively protect services.
- the invention can be used to protect high-level services through low-level processing modules in other multi-layer network equipment, and can replace high-level service processing modules without interrupting the services of other nodes across this node during equipment maintenance.
- Figure 1 is a schematic diagram of multi-layer network equipment using the existing technology for service protection when the network is normal
- Figure 2 is a schematic diagram of multi-layer network equipment using the existing technology for service protection when the working channel fails
- FIG. 3 is a schematic diagram of multi-layer network equipment adopting the present invention for service protection when the equipment is normal;
- FIG. 4 is a schematic diagram of multi-layer network equipment adopting the present invention for service protection when a high-level processing module fails.
- SDH-based multi-service provisioning platform MSPP has the functions of accessing ATM services in addition to the functions of standard SDH transmission nodes.
- the ATM service is accessed through the interface of the ATM processing module, and the SDH service is transmitted through the interface of the SDH processing module.
- the SDH processing module sends the SDH channel corresponding to the ATM service received from the upstream to the AT processing module for processing.
- the ATM processing module uploads the service uploaded locally from the service interface, so that the locally uploaded ATM service and the upstream ATM service pass from this node to the downstream ATM. After the service is multiplexed, it is mapped into the SDH channel, and is handed over to the SDH processing module to be sent downstream.
- FIGS. 1 and 2 The protection mode of the ATM service in the prior art is shown in FIGS. 1 and 2.
- the ATM processing module is connected to form a ring through the SDH channel provided by the SDH processing module. Any two points on the ring divide the entire ring into two two-way links. For these two nodes, one of them is Working link, The other segment is the protection link. When the working link or the intermediate node in the working link fails, the service between these two nodes is reversed to the protection link.
- FIG. 1 is a schematic diagram when the network is normal, where nodes &, b, c, and d form a ring, and the SDH processing modules of each node on the ring provide SDH double rings for ATM services.
- node a and node c establish a protection connection for the ATM services above and below this node, which can be 1 + 1 protection mode or 1: 1 protection mode;
- node b and Node d establishes a transparent virtual channel VP cross-connection for it, in which the link through node d is a working path, and the link through node b is a protection path.
- Service traffic passes through the working path, and the protection path serves as a backup path.
- FIG. 2 is a schematic diagram of using the existing technology for service protection when the working path fails, where nodes a, b, c, and d form a ring, and the SDH processing module on the ring provides SDH double rings for ATM services.
- the business of the ATM processing module of node a and node c is taken as an inspection object.
- both the upper and lower services of node a and node c are switched to the protection path.
- the services of other nodes on the ring are also similar, and are protected by the relevant nodes of the upper and lower services.
- the traffic flows to the protection path.
- the service protection method shown in Figure 2 requires SDH channel rings in different directions. When a node fails, the affected nodes must perform protection operations at the same time. This requires more resources, such as two different directions. SDH channel ring, and the operation is complicated.
- the ATM service protection method of the present invention is shown in Figs. 3 and 4.
- the ATM processing module of each node is connected through the SDH channel provided by the SDH processing module. If the ATM processing module of a node fails, a connection is established by the SDH processing module of the node. The two ends of the SDH channel of the ATM processing module are directly connected to isolate the ATM processing module. Because the transparent virtual channel VP cross-connect is used without changing the VPI / VCI, the ATM processing module of the intermediate node does not change the content of the ATM connection cells between other nodes on the subnet.
- the service protection method of the present invention In addition to the services related to the faulty ATM node being affected, other services will not be affected.
- nodes a, b, and c are located in the same subnet.
- the SDH processing module of the subnet node provides SDH channel connection for ATM services.
- the ATM processing module extracts and inserts the SDH channel from the SDH channel.
- ATM business. The business of the ATM processing modules of nodes a and c is considered as the object of inspection.
- the ATM processing modules of nodes a and c establish ordinary ATM connections for them.
- the ATM processing module of node b establishes ordinary ATM connections for services on and off the local network.
- a transparent VP cross-connection is also established for the services of the ATM processing module of node a and node c, so that although the ATM service between node a and node c passes through the ATM processing module of node b, its content has not changed.
- the advantages of the present invention are that it does not need to occupy more resources, does not need redundant S channels, and is simple to operate.
- the service protection operation can be completed at the node where the ATM processing module fails, and it can also be used for the bypass service during equipment maintenance. protection.
- a node fails it only affects the services of the node, which is suitable for protecting services in the event of multiple points of failure.
- the present invention can also be applied to the case where other multi-layer communication equipment protects the services of the upper layer (equivalent to the ATM layer) by bypassing the connection at the lower layer (equivalent to the SDH layer here).
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Description
一种在多层通讯设备中保护高层业务的方法
技术领域
本发明涉及通讯领域中在多层通讯设备中保护高层业务的方法， 特别是涉 及在多业务提供平台 （MSPP )和多业务传送节点 （MSTP ) 中提供旁通连接保护 异步传输模式 UTM )业务的方法。
背景技术
通常， 对通信网络业务的保护是通过通讯设备中相同层次的替代路由来实 现的 , 如 SDH和 ATM中的自动保护倒换 （见 ITU-T G, 841和 I. 630 )。 这些保 护方法的特点是为特定业务在通讯设备的相同层次上提供两条通路， 即工作通 路和保护通路， 在正常情况下用工作通路来传送业务， 当工作通路发生故障时 由保护通路来传送业务， 工作通路和保护通路之间的切换由邻接故障位置的节 点或者受故障影响的节点来进行。 上述方法在实现保护操作时需要多个节点参 与， 甚至需要在相关的节点间协商， 实现起来比较复杂， 影响效率和稳定性。
在多业务提供平台（MSPP )中， ATM业务是由 ATM处理模块提供， ATM处理 模块的主要功能是： 下传子网上其它节点到本节点的 ATM业务； 上传本节点到 子网上其它节点的 ATM业务， 实际上在某节点的 ATM业务处理模块对子网上其 它节点间的 ATM业务是不进行处理的。 ATM处理模块作为一个功能模块， 在出 现故障时， 只是失去下传和上传与本节点相关的 ATM业务的功能， 并没有影响 其它节点间的业务。 在其它多层网络设备中也存在同样类似问题。 因此如果采 用传统的 ATM业务保护方式，实际上是把 MSPP中 ATM处理模块和 SDH处理模块 当作独立设备分别看待， 无法充分发挥其相互结合的优势。
发明内容
本发明所要解决的技术问题是提出一种在多层通讯设备中保护高层业务的
方法， 克服现有技术在对多业务提供平台 （MSPP )和多业务传送节点 （MSTP ) 中的 ATM业务进行保护操作时需要多个节点参与的缺点， 解决了多层网络设备 中通过低层处理模块保护高层业务的问题。
本发明所述一种在多层通讯设备中保护高层业务的方法，其处理步驟如下： 第一步， 低层处理模块为高层处理模块提供低层传输通道；
第二步， 高层处理模块从低层传输通道中提取和插入本节点的高层业务， 并使上游节点与下游节点间的业务经过本节点高层处理模块后不影响其业务内 容；对于 ATM业务，即建立不改变虚通道标识 /虚信道标识 VPI/VCI的交叉连接， 以下称为透明 VP连接；
第三步， 高层处理模块检测到本模块出现故障后通知低层处理模块， 通知 方式可以是软件消息也可以是硬件信号；
第四步， 低层处理模块检测到高层处理模块出现故障后建立旁通连接， 将 出现故障的高层处理模块隔离。
所述低层处理模块检测高层处理模块出现故障进一步包括判断高层处理模 块传送的业务信号是否失效或者检查到高层处理模块发送的报告失效的硬件信 号或软件消息； 所述旁通连接可以是实际的物理线路连接也可以是低层处理模 块内部的逻辑连接（如 MSPP中 SDH通道）。
采用本发明所述方法， 不需要建立冗余的网络通道， 对组网保护方式也没 有限制。 本发明主要针对在多业务提供平台 MSPP和多业务传送节点 MSTP中， 当 ATM层处理功能失效的情况下对 ATM业务进行的有效保护； 本发明解决了在 设备维护时对网络其它节点跨本节点业务的影响问题。 本发明保护操作在发生 故障的节点完成， 只影响在该节点上下的业务。如果在多个节点同时出现故障， 可以分别对各故障节点进行保护， 相互之间不影响。 与现有技术相比， 达到了
优化网络设备， 节省设备成本的目的， 并且简化操作， 提高了处理效率； 本发 明还可以隔离多点故障， 能够有效地进行业务保护。 本发明可用于其它多层网 络设备中通过低层处理模块保护高层业务， 在设备维护时可不中断其它节点跨 越本节点的业务而更换高层业务处理模块。
附图说明
图 1 是网络正常时多层网络设备采用现有技术进行业务保护的示意图； 图 2 是工作通道出现故障时多层网络设备采用现有技术进行业务保护的 示意图；
图 3 是设备正常时多层网络设备采用本发明进行业务保护的示意图； 图 4 是高层处理模块出现故障时多层网络设备采用本发明进行业务保护 的示意图。
具体实施方式
下面结合附图以在基于 SDH的多业务提供平台 MSPP中对 ATM业务进行保护 的应用为例， 对本发明的技术方案作进一步的详细描述。
基于 SDH的多业务提供平台 MSPP除了具有标准的 SDH传送节点所具有的功 能外， 还具有 ATM业务的接入功能。 通过 ATM处理模块的接口接入 ATM业务， 通过 SDH处理模块的接口进行 SDH业务传输。 SDH处理模块将从上游接收的 ATM 业务对应的 SDH通道送给 AT 处理模块处理， ATM处理模块将从本地上传的业 务通过业务接口上传，这样本地上传的 ATM业务和上游通过本节点到下游的 ATM 业务复用后， 映射到 SDH通道中， 交给 SDH处理模块向下游发送。
现有技术中对 ATM业务的保护方式如图 1和图 2所示。 在多业务提供平台 MSPP中， ATM处理模块通过 SDH处理模块提供的 SDH通道连成环， 环上的任意 两点将整个环分成两段双向链路， 对这两个节点来说， 其中一段为工作链路，
另一段为保护链路。 当工作链路或者工作链路中的中间节.点故障时， 这两个节 点之间的业务倒向保护链路。
图 1是网络正常时的示意图， 其中节点&、 b、 c、 d組成一个环， 环上各节 点的 SDH处理模块为 ATM业务提供 SDH双环。 以节点 a和节点 c的 ATM处理模 块的业务为考察对象， 节点 a和节点 c为在本节点上下的 ATM业务建立保护连 接， 可以是 1+1保护方式或 1: 1保护方式； 节点 b和节点 d则为其建立透明虚 通道 VP交叉连接，其中 支定通过节点 d的链路为工作通路，通过节点 b的链路 为保护通路， 业务流量经过工作通路， 而保护通路作为备用通道。
图 2为当工作通路发生故障时采用现有技术进行业务保护的示意图， 其中 节点 a、 b、 c、 d组成一个环， 环上 SDH处理模块为 ATM业务提供 SDH双环。 以 节点 a和节点 c的 ATM处理模块的业务为考察对象， 当经过节点 d的工作通路 发生故障时， 节点 a和节点 c的上下业务都倒向保护通路。 环上其它节点的业 务也分别类似， 由上下业务的相关节点进行保护， 业务流量在工作通路故障时 倒向保护通路。
图 2所示的业务保护方法需要 个不同方向的 SDH通道环， 当一处节点出 现故障时， 受影响的各个节点都要同时进行保护操作， 这样需要占用比较多的 资源， 例如两个不同方向的 SDH通道环， 而且操作复杂。
本发明的 ATM业务保护方法如图 3和图 4所示。 在多业务提供平台 MSPP 中， 各节点的 ATM处理模块通过 SDH处理模块提供的 SDH通道连接起来， 如果 某个节点的 ATM处理模块出现故障，则由该节点的 SDH处理模块建立一个连接， 将该 ATM处理模块的 SDH通道两端直接相连， 从而将该 ATM处理模块隔离。 由 于采用不改变 VPI/VCI的透明虚通道 VP交叉连接，因此中间节点的 ATM处理模 块不改变子网上其它节点间 ATM连接信元的内容。 采用本发明业务保护方法除
了与故障 ATM节点相关的业务受到影响外， 其它的业务不会受到影响。
如图 3所示， 在网络正常时， 节点 a、 b、 c位于同一个子网内， 子网节点 的 SDH处理模块为 ATM业务提供 SDH通道连接， ATM处理模块从 SDH通道提取 和插入本节点的 ATM业务。 以节点 a和节点 c的 ATM处理模块的业务为考察对 象， 节点 a和节点 c的 ATM处理模块为其建立普通的 ATM连接， 节点 b的 ATM 处理模块除了为在本地上下的业务建立普通 ATM连接外， 还为节点 a和节点 c 的 ATM处理模块的业务建立透明 VP交叉连接，这样虽然节点 a和节点 c之间的 ATM业务经过了节点 b的 ATM处理模块， 但是其内容并没有改变。
在图 4中， 当节点 b的 ATM处理模块出现故障时， 则拆除节点 b的 ATM处 理模块与两个 SDH通道的连接， 并由 SDH处理模块将被拆除的两个 SDH通道的 另一端直接相连，这样节点 a和节点 c之间的 ATM业务在节点 b就不再经过 ATM 处理模块的处理， 此时虽然节点 b本地的 ATM业务已经丟失， 但是节点 a和节 点 c之间的 ATM业务在节点 b可通过 SDH通道直通， 使其不受影响。
本发明的优点就是无需占用较多的资源， 不需要冗余的 S 通道， 操作简 单， 业务保护操作可在 ATM处理模块出现故障的节点处完成， 还可以在设备维 护时用于对过路业务的保护。 另外， 当节点出现故障时， 只影响该节点的业务， 适合在多点出现故障时对业务的保护。 当然， 本发明还可以应用于其它多层通 讯设备中通过低层（相当于这里的 SDH层）旁通连接保护高层（相当于这里的 ATM层）业务的情形。
最后所应说明的是， 以上实施例仅用以说明本发明的技术方案而非限制， 尽管参照较佳实施例对本发明进行了详细说明， 本领域的普通技术人员应当理 解， 可以对本发明的技术方案进行修改或者等同替换， 而不脱离本发明技术方 案的精神和范围， 其均应涵盖在本发明的权利要求范围当中。
Claims
1、 一种在多层通讯设备中保护高层业务的方法， 其特征在于， 包括以下步 骤：
第一步， 低层处理模块为高层处理模块提供低层传输通道；
第二步， 高层处理模块从低层传输通道中提取和插入本节点的高层业务， 并使上游节点与下游节点间的业务经过本节点高层处理模块后不影响其业务内 容；
第三步， 高层处理模块检测到本模块出现故障后通知低层处理模块； 第四步， 低层处理模块检测到高层处理模块出现故障后建立旁通连接， 将 出现故障的高层处理模块隔离。
2、根据权利要求 1所述的在多层通讯设备中保护高层业务的方法，其特征 在于，所述步 二中，对通过本节点高层处理模块的业务建立透明虚通道连接， 即对 ATM业务， 建立不改变虚通道标识 /虚信道标识的交叉连接，使上游节点与 下游节点间的业务经过本节点高层处理模块后不影响其业务内容。
3、根据权利要求 1所述的在多层通讯设备中保护高层业务的方法，其特征 在于， 所述步骤三中高层处理模块检测到本模块出现故障后， 釆用软件消息或 硬件信号的方式通知低层处理模块。
4、根据权利要求 1所述的在多层通讯设备中保护高层业务的方法，其特征 在于： 所述步尊四中， 所述低层处理模块检测高层处理模块出现故障进一步包 括： 低层处理模块判断高层处理模块传送的业务信号是否失效， 或者低层处理
模块检查到高层处理模块发出的报告失效的硬件信号或软件消息。
5、根据权利要求 1或 4所述的在多层通讯设备中保护高层业务的方法，其 特征在于， 所述旁通连接是实际的物理线路连接， 或者是低层处理模块内部的 逻辑连接。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/522,057 US7881186B2 (en) | 2002-07-24 | 2003-07-17 | Method about protecting high layer service in the multilayer communication equipment |
| AU2003281605A AU2003281605A1 (en) | 2002-07-24 | 2003-07-17 | A method about protecting high layer service in the multilayer communication equipment |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02136261.0 | 2002-07-24 | ||
| CNB021362610A CN100433687C (zh) | 2002-07-24 | 2002-07-24 | 一种在多层通讯设备中保护高层业务的方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004010644A1 true WO2004010644A1 (fr) | 2004-01-29 |
Family
ID=30121836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2003/000573 Ceased WO2004010644A1 (fr) | 2002-07-24 | 2003-07-17 | Procede pour proteger un service de couche superieure dans un equipement de communication multicouche |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7881186B2 (zh) |
| KR (1) | KR100664343B1 (zh) |
| CN (1) | CN100433687C (zh) |
| AU (1) | AU2003281605A1 (zh) |
| WO (1) | WO2004010644A1 (zh) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8761045B2 (en) * | 2011-12-01 | 2014-06-24 | Adva Optical Networking Se | Method for providing network failure independent links in a multilayer network |
| CN106357529B (zh) * | 2015-07-21 | 2019-12-10 | 中国移动通信集团公司 | 一种多层网络中业务保护的方法、设备和系统 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5469428A (en) * | 1991-03-26 | 1995-11-21 | Nippon Telegraph And Telephone Corporation | Loop-back system in a dual ring network |
| CN1141105A (zh) * | 1994-02-19 | 1997-01-22 | Gpt有限公司 | 包含信道切换保护装置的电信网络 |
| US5793746A (en) * | 1996-04-29 | 1998-08-11 | International Business Machines Corporation | Fault-tolerant multichannel multiplexer ring configuration |
| CN1208526A (zh) * | 1996-11-12 | 1999-02-17 | 株式会社东芝 | 环形网络系统及其路径控制方法 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2711818B1 (fr) * | 1993-10-22 | 1995-12-01 | Cegelec | Procédé de diffusion de données à train de données. |
| US5627836A (en) * | 1995-01-31 | 1997-05-06 | Bell Atlantic Network Services, Inc. | VPI/VCI administration |
| JPH11508427A (ja) * | 1995-06-26 | 1999-07-21 | テレフオンアクチーボラゲツト エル エム エリクソン（パブル） | 自己回復網 |
| US6081529A (en) * | 1995-11-22 | 2000-06-27 | Sprint Communications Company, L. P. | ATM transport system |
| US6633566B1 (en) * | 1998-06-16 | 2003-10-14 | Mci Communications Corporation | Method, apparatus and computer program product for interfacing a TDM link with a cell-switched network |
| US6301254B1 (en) * | 1999-03-15 | 2001-10-09 | Tellabs Operations, Inc. | Virtual path ring protection method and apparatus |
| US7054265B1 (en) * | 1999-06-09 | 2006-05-30 | Hitachi, Ltd. | Communication apparatus and communication system |
| WO2002009354A2 (en) * | 2000-07-20 | 2002-01-31 | At & T Corp. | Joint ip/optical layer restoration after a router failure |
| JP3587250B2 (ja) * | 2001-04-27 | 2004-11-10 | 日本電気株式会社 | 自動障害回復を行う通信装置及び自動障害回復方法 |
-
2002
- 2002-07-24 CN CNB021362610A patent/CN100433687C/zh not_active Expired - Fee Related
-
2003
- 2003-07-17 KR KR1020057001270A patent/KR100664343B1/ko not_active Expired - Fee Related
- 2003-07-17 WO PCT/CN2003/000573 patent/WO2004010644A1/zh not_active Ceased
- 2003-07-17 US US10/522,057 patent/US7881186B2/en not_active Expired - Fee Related
- 2003-07-17 AU AU2003281605A patent/AU2003281605A1/en not_active Abandoned
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5469428A (en) * | 1991-03-26 | 1995-11-21 | Nippon Telegraph And Telephone Corporation | Loop-back system in a dual ring network |
| CN1141105A (zh) * | 1994-02-19 | 1997-01-22 | Gpt有限公司 | 包含信道切换保护装置的电信网络 |
| US5793746A (en) * | 1996-04-29 | 1998-08-11 | International Business Machines Corporation | Fault-tolerant multichannel multiplexer ring configuration |
| CN1208526A (zh) * | 1996-11-12 | 1999-02-17 | 株式会社东芝 | 环形网络系统及其路径控制方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20050220141A1 (en) | 2005-10-06 |
| US7881186B2 (en) | 2011-02-01 |
| KR100664343B1 (ko) | 2007-01-02 |
| CN1471271A (zh) | 2004-01-28 |
| KR20050025988A (ko) | 2005-03-14 |
| AU2003281605A1 (en) | 2004-02-09 |
| CN100433687C (zh) | 2008-11-12 |
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