CN1306769C - A method of service backup in asynchronous transmission mode group network - Google Patents
A method of service backup in asynchronous transmission mode group network Download PDFInfo
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- CN1306769C CN1306769C CNB031294383A CN03129438A CN1306769C CN 1306769 C CN1306769 C CN 1306769C CN B031294383 A CNB031294383 A CN B031294383A CN 03129438 A CN03129438 A CN 03129438A CN 1306769 C CN1306769 C CN 1306769C
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- virtual
- connection
- virtual channel
- asynchronous transfer
- transfer mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5625—Operations, administration and maintenance [OAM]
- H04L2012/5627—Fault tolerance and recovery
Abstract
The present invention provides a business backup method in an asynchronous transfer mode (ATM) device network, which has the advantages of simple realization mode and strong protection function. In the method of the present invention, multicast connection or unidirectional unicast connection is configured to provide redundant virtual channel connection for a bearer service to realize service backup, and simultaneously, an alarm on a physical layer and an alarm on an ATM layer are used for realizing that the service can quickly detect failures and carry out exchange. Particularly, in order to protect the destination terminal of unidirectional virtual connection, a source terminal point is set into a root node of multicast virtual channel connection, and each of the distination terminal points is set into a leaf node of the root node of the multicast virtual channel connection. In order to protect the source terminal point of the unidirectional virtual connection, the unidirectional unicast virtual channel connection from each source terminal point (which comprises the working and two terminal points) to the destination terminal point. Each unidirectional unicast virtual channel connection has the same virtual path identifiers / virtual channel identifiers and flow parameters. One of the unidirectional virtual channel connections is set into main connection in an activated state, and the rest unidirectional unicast virtual channel connections are set into backup connections in an unactivated state.
Description
Technical field
The present invention relates to the service backup method in the ATM(Asynchronous Transfer Mode) equipment network, particularly a kind of method of utilizing ATM multicast function to realize service backup and fast detecting service channel fault.
Background technology
ATM(Asynchronous Transfer Mode) is a kind of fast packet switching technology, and the packet that it adopts regular length is called cell.ATM cell only just needs bandwidth when transfer of data is arranged, be equivalent to the such time slot of adaptive multiplexer and carry out continuous transmission but can provide.Each ATM connects the label sign of using in the cell stem.Label comprises Virtual Path Identifier (Virtual Channel Identifier is designated hereinafter simply as VCI) and virtual path identifiers (Virtual Path Identifier is designated hereinafter simply as VPI) VPI.Article one, Virtual Channel (Virtual Channel is designated hereinafter simply as VC) is a communication path that transmits ATM cell between two or more end points, and a virtual path (Virtual Path is designated hereinafter simply as VP) is one group of VC with same endpoints.At a given interface, multiplexingly discern with their VPI, and multiplexing different VC in a VP discern with their VCI at the many different VP of transmission on the payload.
In data communication network, atm technology is being brought into play very important effect, be widely used in inserting, converge with core switching device in, below all equipment based on atm technology are called atm switching apparatus.Atm device is generally supported multiple interfaces, and as E1, E3, STM-1, STM-4 etc., atm device is undertaken interconnected with the realization MANET by these interfaces, thus miscellaneous services such as carrying video, voice, data and online.
Reliable in order to guarantee these service security, when networking, the main control unit of atm device and network board generally need adopt double copies designs with guarantee bearer service wherein a path breaks down the time alternative with other one the tunnel.
A kind of existing service backup method is to switch by route to realize service protection or interface backup.Particularly, in the method, by realizing that between the levels atm device atm forum and ITU-T related protocol (as PNNI1.1 and IISP etc.) manage the Link State between atm device, support dynamic routing protocol, and distribute the address for all ATM users, to support the dynamic calling agreement between the user.When needs transmit data, the source end makes a call and sets up virtual connections with dynamic application, and normal interface is selected according to current routing iinformation by system and send the virtual connections request to destination equipment, thus, can between them, set up end-to-end connection on the similar common atm interface through the negotiation between two atm devices.When interface breaks down, routing state will change, and system discharges virtual connections current between two atm devices and sets up new connection again according to new routing iinformation between them.
The shortcoming of said method is the related protocol that the equipment of all participation networkings of requirement is all supported atm forum or ITU-T, cause the implementation complexity, and on Digital Subscriber Line access module (DSLAM), in order to reduce cost, seldom need the SVC/SPVC software protocol is provided support, so this method is not suitable for DSLAM.In addition,,, can not satisfy the requirement of switching of some bearer service, faults such as disconnected words for example just might take place in the V5 speech business so switching time is long owing to consult to realize switching by software.
Another kind of service backup method is compared with said method, mainly depends on the design on the hardware, and it provides spare interface board for every interface board, under normal circumstances, only uses transceive data on the interface of interface board the master, and spare interface board is deal with data not.And when main break down with interface board or main with interface board on interface when breaking down, main board stops deal with data and is set at standby plate, and previous standby plate upgrades to main board and begins transceive data.It is to consider two active and standby each other interfaces are provided in a veneer that a kind of hardware designs is also arranged, and has only an interface in the same time in transceive data, and when an interface broke down, data processing was transferred to the another one interface.
Said method need design especially to hardware, causes cost to raise, and is difficult to achieve a butt joint mouthful active and standby and the plate level is supported active and standby the time, and is unfavorable for the upgrading of establishing network switch function.In addition, switching when this method can only be handled two-stage atm device interface fault is responsible to replace, and in the networking of multi-staged ATM equipment, can't protect for the fault of intermediate line link and node and to switch.
Also having a kind of interface backup method is the MANET function of abandoning between atm device, carries out networking by transmission equipment.Because this need increase a cover transmission equipment newly, thus the cost costliness, and also networking is also dumb.
Summary of the invention
The purpose of this invention is to provide the service backup method in a kind of ATM(Asynchronous Transfer Mode) equipment network, it has the simple but strong advantage of defencive function of implementation.
Above-mentioned purpose of the present invention realizes by following service backup method:
Service backup method in a kind of ATM(Asynchronous Transfer Mode) group network system, described system provides redundant Virtual Channel to connect by the Virtual Channel connection for bearer service and realizes service backup, wherein, described system sets up from the extremely permanent virtual connection of some destination points of a source endpoint according to following manner:
Source endpoint is set to the root node that multicast connects;
Each purpose end points is set to the leaf node that described multicast connects root node.
In the service backup method in above-mentioned ATM group network system, described source endpoint and purpose end points are connected to cell bus to finish the exchange of ATM cell by bus mode.
In the service backup method in above-mentioned ATM group network system, described source endpoint and purpose end points are connected to centralized ATM switching network to finish the exchange of ATM cell by it.
Above-mentioned purpose of the present invention also realizes by following service backup method:
Service backup method in a kind of ATM(Asynchronous Transfer Mode) group network system, described system provides redundant Virtual Channel to connect by the Virtual Channel connection for bearer service and realizes service backup, wherein, described system sets up from the extremely permanent virtual connection of some destination points of some source endpoints according to following manner:
Each source endpoint is set to the root node that a multicast connects, each purpose end points is set to the leaf node that each multicast connects root node, and the all-multicast connection has identical virtual path identifiers (VPI)/Virtual Path Identifier (VCI) configuration and flow parameter configuration;
One of them multicast connection is set to be in the main with connection of state of activation, and all the other multicasts connections then are set to be in the standby connection of unactivated state,
And described system changes the state that permanent virtual connects according to following manner:
If current is main unavailable with connecting, then realize main with switching of connecting by it being arranged at unactivated state and being arranged at state of activation with one in all the other multicasts connections.
In the service backup method in above-mentioned ATM group network system, described source endpoint and purpose end points are connected to cell bus to finish the exchange of ATM cell by bus mode.
In the service backup method in above-mentioned ATM group network system, described source endpoint and purpose end points are connected to centralized switching network to finish the exchange of ATM cell by it.
Above-mentioned purpose of the present invention also realizes by following service backup method:
Service backup method in a kind of ATM(Asynchronous Transfer Mode) group network system, described system provides redundant Virtual Channel to connect by the Virtual Channel connection for bearer service and realizes service backup, wherein, described system sets up from the permanent virtual of some source endpoints to purpose end points according to following manner and connects:
The unidirectional clean culture of foundation from each source endpoint to the purpose end points connects, and every unidirectional clean culture connection has identical virtual path identifiers (VPI)/Virtual Path Identifier (VCI) and flow parameter;
Wherein a unidirectional clean culture connection is set to be in the main with connection of state of activation, and all the other unidirectional clean cultures connect the standby connection that then is set to be in unactivated state,
And described system changes the state that permanent virtual connects according to following manner:
If current is main unavailable with connecting, then be set to unactivated state and be arranged at state of activation realize main with switching of connecting with one in all the other unidirectional clean cultures connections by it.
In the service backup method in above-mentioned ATM group network system, described source endpoint and purpose end points are connected to cell bus to finish the exchange of ATM cell by bus mode.
In the service backup method in above-mentioned ATM group network system, described source endpoint and purpose end points are connected to centralized switching network to finish the exchange of ATM cell by it.
In the service backup method in above-mentioned ATM group network system; for virtual connections with identical work/protection interface; judge according to the physical layer alarm that atm interface reports whether the main virtual connections with the connection business of carrying is communicated with; for virtual connections, judge according to the OAM layer alarm that virtual path reports whether the carrying master is communicated with connecting professional virtual connections with identical work/protection virtual path.
Therefore in service backup method of the present invention, the ATM group network system is by suitably configuration multicast connection or unidirectional clean culture connection, and can be bearer service provides redundant Virtual Channel to connect to realize service backup.
Description of drawings
By below in conjunction with the description of accompanying drawing to preferred embodiment of the present invention, can further understand purpose of the present invention, feature and advantage, wherein:
Fig. 1 is the schematic diagram according to an embodiment of the inventive method.
Fig. 2 is the schematic diagram according to another embodiment of the inventive method.
Embodiment
The core concept of the inventive method is to realize below being further elaborated service backup by provide redundant Virtual Channel to connect for bearer service.
In situation 1, if a business is carried by the permanent virtual connection of a source endpoint to a purpose end points, in order to provide the service backup ability to the purpose end points, according to the present invention, except this purpose end points, also can increase a plurality of purpose end points and between each purpose end points of source endpoint and increase, all set up this professional Virtual Channel of carrying and be connected.The Virtual Channel that the multicast function of atm technology can be set up starting point-multiple spot connects, therefore can be used to realize above-mentioned service backup ability, that is, at first source endpoint is set to the root node that multicast connects, and each purpose end points is set to the leaf node that described multicast connects root node then.
In situation 2, if one professional originally as multicast service, promptly, source endpoint as root node to a plurality of purpose end points transport services as its leaf node, for source endpoint being provided the service backup ability, according to the present invention, except this source endpoint, also can increase the multiple source end points, and each source endpoint all is set to the root node that a multicast connects, each purpose end points is set to the leaf node that each multicast connects root node, and the all-multicast connection has identical virtual path identifiers (VPI)/Virtual Path Identifier (VCI) configuration and flow parameter configuration.Constantly only have a multicast to be connected transport service in order to ensure each, should one of them multicast connection be set to be in the main with connecting of state of activation, remaining then is set to be in the standby connection of unactivated state.If current is main unavailable with connecting, then realize main with switching of connecting by it being arranged at unactivated state and being arranged at state of activation with one in all the other multicasts connections.
In situation 3, if a business is carried by the permanent virtual connection of a source endpoint to a purpose end points, for source endpoint being provided the service backup ability, according to the present invention, except this source endpoint, also can increase the multiple source end points, and the unidirectional clean culture of setting up from each source endpoint to the purpose end points connects, and every unidirectional clean culture connection has identical virtual path identifiers (VPI)/Virtual Path Identifier (VCI) and flow parameter.Constantly only have a unicast one-way to be connected transport service in order to ensure each, wherein a unidirectional clean culture connection is set to be in the main with connecting of state of activation, and all the other unidirectional clean cultures connect the standby connection that then is set to be in unactivated state.If current is main unavailable with connecting, then be set to unactivated state and be arranged at state of activation realize main with switching of connecting with one in all the other unidirectional clean cultures connections by it.
Said circumstances 1～3rd, basic connection type, the service backup of other connection type can be by realization that said method is combined.For example the bidirectional unicast for point-multiple spot connects, and can adopt the method for situation 1 to realize the service backup of point to the virtual connections of multiple spot, and adopts the method for situation 3 to realize the service backup of multiple spot to the virtual connections of point.
Below by embodiment two preferred embodiments that the protection utilize the present invention to realize that bidirectional unicast connects is switched are described, wherein, first embodiment is used for the atm device of bus type switching fabric, second embodiment is used for concentrating the atm device of switched fabric.
First embodiment
In the atm device of Access Layer, the general bus type switching fabric as shown in Figure 1 that adopts connects, for simplicity, here suppose that three interface board A, B, C realize the exchange of ATM cell based on the bus type switching fabric, interface board B and interface board C provide upstream Interface and are linked into respectively on equipment one and the equipment two, that is to say, be linked in the upper layer network by two upstream Interfaces.
In order to make the business that inserts through interface board A reliablely and stablely be sent to upper layer network (being equipment one and two), need provide selection path between these two interfaces for this business by two upstream Interfaces on interface board B and the interface board C.The specific implementation method is as follows:
When setting up the permanent virtual connection, at interface board A to the direction of interface board B and interface board C, setting up one earlier is root node and be the root that the multicast of leaf node connects with interface board B with interface board A, in this connection, increase a leaf then to interface board C, that is, interface board C also is set to the leaf node that this multicast connects.And at interface board B and interface board C to the direction of interface board A, respectively from interface board B to interface board A with respectively set up a unidirectional clean culture from interface board C to interface board A and be connected, these two are connected source point and use identical VPI/VCI and have identical flow parameter with point of destination.In addition, constantly only have connections available, should only activate in these two connections in order to guarantee each, for example here hypothesis activation be the clean culture connection of interface board B to interface board A.
Multicast at this two leaf connects under the configuration of+two unidirectional clean cultures connections, the data that interface board A connects are sent to being connected on interface board B and the C simultaneously, but interface board A only receives data from interface board B, has realized transmitting with the data of upstream plant by " dual transmitting and receiving " this pattern thus.When needs are switched (for example when the malunion of interface board B often maybe can't receive data); interface board A is connected to the multicast of interface board B and interface board C and does not change; only need control interface board B and interface board C to get final product to the state that two unidirectional clean cultures of interface board A are connected; particularly, deexcitation interface board B connects and activation interface plate C connects to the clean culture of interface board A to the clean culture of interface board A.
In order to realize switching fast, the failure condition of each bar virtual connections need in time be known by system, therefore should between this equipment and higher level equipment, support physical layer alarm and operation and management (OAM) alarm ability, connect in time to switch clean culture with the OAM alarm that is connected according to interface link.
Because the Virtual Channel (VC) of an interface support connects more, if utilize F5 alarm cell to detect the state of data transmit-receive in each bar VC connection, then need to consume more system resources, for saving system resource, can be connected the identical VPI of distribution with same professional VC for having same path, therefore can in equipment, only utilize F4 alarm cell, promptly, only the alarm to the VP layer detects, in case find fault, just all VC on this VP is switched.For example the virtual connections with identical working port/protection port can be included in the same protection group; in this group, select arbitrarily a VP as the passage of setting up F4 OAM, then in this OAM passage periodically (for example 0.5 second) continue to send cc cell (or receiving cell).If in continuous 3 cc cell transmission cycles, do not receive cc cell, then think protection group fault, and the business of whole protecting group is switched on the protection path from operating path.
In addition, can also adopt I.610, I.630 wait relevant protection agreement to detect RLOS/ROF/SD alarm, the AIS/RDI alarm of ATM layer, the interface on the equipment, the single board default alarm of physical layer, switch thereby start service protection.
Second embodiment
In backbone layer and convergence-level equipment; because exchange capacity demand height; so the general centralized switching fabric as shown in Figure 2 that adopts connects; for simplicity; here suppose that three ATM Service Processing Units insert switching network to realize the exchange of ATM cell through interface board A, B, C and network board respectively, interface board B and C provide working port and protection port respectively.
For the business that interface board A is inserted reliablely and stablely transmits by two ports on interface board B and the C, need provide two to select the path for this business.The specific implementation method also can adopt the multicast of two leaves to connect the configuration that+two unidirectional clean cultures connect, and below is further described.
When setting up the permanent virtual connection, at interface board A to the direction of interface board B and C, setting up one earlier is root node and be the root that the multicast of leaf node connects with interface board B with interface board A, in this connection, increase a leaf then to interface board C, that is, interface board C also is set to the leaf node that this multicast connects.And at interface board B and C to the direction of interface board A, respectively set up a unidirectional clean culture with interface board C to interface board A from interface board B to interface board A respectively and be connected, these two are connected source point and use identical VPI/VCI and have identical flow parameter with point of destination.In addition, constantly only have connections available, should only activate in these two connections in order to guarantee each, for example here hypothesis activation be the clean culture connection of interface board B to interface board A.
Equally, in running, the data that interface board A connects are sent to being connected on interface board B and the C simultaneously, but interface board A only receives data from interface board B, has realized the reliable transmission of data thus by " dual transmitting and receiving " this pattern.When needs are switched (for example when the malunion of interface board B often maybe can't receive data); interface board A is connected to the multicast of interface board B and C and does not change; only need control interface board B and interface board C to get final product to the state that two unidirectional clean cultures of interface board A are connected; particularly, deexcitation interface board B connects and activation interface plate C connects to the clean culture of interface board A to the clean culture of interface board A.
Compare with first embodiment, second embodiment should support physical layer alarm and operation and management (OAM) alarm ability too between this equipment and higher level equipment, connects in time to switch clean culture according to interface link with the OAM alarm that is connected.And, equally also can be connected the identical VPI of distribution with same professional VC for having same path for saving system resource, therefore can in equipment, only utilize F4 alarm cell.
In a word, no matter be to concentrate switched fabric or bus type switching fabric, can utilize method of the present invention to realize the service backup that bidirectional unicast connects, difference only is the difference of multicast replicated architecture.For those skilled in the art, the service backup of other connection type also is so, therefore repeats no more.
Therefore; utilize method of the present invention to need not that the interface hardware of atm device is done any special design and can realize that the protection of interface switches; as long as atm device is supported the multicast characteristic; therefore the scope of application is extensive; the interface type of supporting abundant (can support various interfaces such as E1/T1, E3/T3, STM-1/STM-4); portable strong, cost is low.
In addition, method of the present invention can realize that not only the protection of plate level and interface level switches, but also can realize that being responsible to replace of VP level switch, so range of application is wider, and mode is more flexible, and defencive function is more powerful.
At last, compare with the backup scenario that other softwares such as adopting SVC are realized, technical scheme simplicity of design of the present invention, the speed of switching is fast, can accomplish just to finish within 50ms to switch, and therefore the miscellaneous service to carrying does not have influence substantially.
Claims (10)
1. the service backup method that the asynchronous transfer mode group network system is interior is characterized in that, the permanent virtual that described system sets up from a source endpoint to some destination points according to following manner connects:
Source endpoint is set to the root node that the multicast Virtual Channel connects;
Each purpose end points is set to the leaf node that described multicast Virtual Channel connects root node.
2. the service backup method in the asynchronous transfer mode group network system as claimed in claim 1 is characterized in that described source endpoint and purpose end points are connected to cell bus to finish the exchange of ATM cell by bus mode.
3. the service backup method in the asynchronous transfer mode group network system as claimed in claim 1 is characterized in that, described source endpoint and purpose end points are connected to the asynchronous transfer mode switching network to finish the exchange of ATM cell by concentrated exchanged form.
4. the service backup method that the asynchronous transfer mode group network system is interior is characterized in that, the permanent virtual that described system sets up from some source endpoints to some destination points according to following manner connects:
Each source endpoint is set to the root node that a multicast Virtual Channel connects, each purpose end points is set to the leaf node that each multicast Virtual Channel connects root node, and the connection of all-multicast Virtual Channel has identical virtual path identifiers/Virtual Path Identifier configuration and flow parameter configuration;
One of them multicast Virtual Channel connection is set to be in the main with connection of state of activation, and all the other multicast Virtual Channels connections then are set to be in the standby connection of unactivated state,
And described system changes the state that permanent virtual connects according to following manner:
If current main professional when obstructed with connecting, then by it is arranged at unactivated state and all the other multicast Virtual Channels are connected in one be arranged at state of activation and realize main switching with connection.
5. the service backup method in the asynchronous transfer mode group network system as claimed in claim 4 is characterized in that described source endpoint and purpose end points are connected to cell bus to finish the exchange of ATM cell by bus mode.
6. the service backup method in the asynchronous transfer mode group network system as claimed in claim 4 is characterized in that, described source endpoint and purpose end points are connected to the asynchronous transfer mode switching network to finish the exchange of ATM cell by concentrated exchanged form.
7. the service backup method that the asynchronous transfer mode group network system is interior is characterized in that, described system sets up from the permanent virtual of some source endpoints to purpose end points according to following manner and connects:
The unidirectional clean culture Virtual Channel of foundation from each source endpoint to the purpose end points connects, and every unidirectional clean culture Virtual Channel connection has identical virtual path identifiers/Virtual Path Identifier and flow parameter;
Wherein a unidirectional clean culture Virtual Channel connection is set to be in the main with connection of state of activation, and all the other unidirectional clean culture Virtual Channels connect the standby connection that then is set to be in unactivated state,
And described system changes the state that permanent virtual connects according to following manner:
If current main professional when obstructed with connecting, then be set to unactivated state by it and all the other unidirectional clean culture Virtual Channels are connected in one be arranged at state of activation and realize main switching with connection.
8. the service backup method in the asynchronous transfer mode group network system as claimed in claim 7 is characterized in that described source endpoint and purpose end points are connected to cell bus to finish the exchange of cell by bus mode.
9. the service backup method in the asynchronous transfer mode group network system as claimed in claim 7 is characterized in that, described source endpoint and purpose end points are connected to the asynchronous transfer mode net to exchange the exchange of finishing ATM cell by concentrating.
10. as the service backup method in claim 4 or the 7 described asynchronous transfer mode system group networks; it is characterized in that; for virtual connections with identical work/protection interface; judge according to the physical layer alarm that asynchronous transfer mode interface reports whether the main virtual connections with the connection business of carrying is communicated with; for virtual connections, judge with managing alarm whether the main virtual connections that is connected business of using of carrying is communicated with according to the operation that virtual path reports with identical work/protection virtual path.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031294383A CN1306769C (en) | 2003-06-23 | 2003-06-23 | A method of service backup in asynchronous transmission mode group network |
| PCT/CN2004/000159 WO2004114594A1 (en) | 2003-06-23 | 2004-03-01 | A method on device service backup in synchronous transfer mode(atm) group net |
| HK05105365A HK1072670A1 (en) | 2003-06-23 | 2005-06-28 | Method for traffic backup within a network of asynchronous transfer mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031294383A CN1306769C (en) | 2003-06-23 | 2003-06-23 | A method of service backup in asynchronous transmission mode group network |
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| Publication Number | Publication Date |
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| CN1567890A CN1567890A (en) | 2005-01-19 |
| CN1306769C true CN1306769C (en) | 2007-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031294383A Expired - Fee Related CN1306769C (en) | 2003-06-23 | 2003-06-23 | A method of service backup in asynchronous transmission mode group network |
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| Country | Link |
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| CN (1) | CN1306769C (en) |
| HK (1) | HK1072670A1 (en) |
| WO (1) | WO2004114594A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1848139A1 (en) * | 2006-04-18 | 2007-10-24 | THOMSON Licensing | Method and device for transmitting data to several receivers using ARQ |
| CN101715648B (en) * | 2007-06-04 | 2012-11-14 | 艾利森电话股份有限公司 | Method and arrangement for improved channel switching |
| US20110090783A1 (en) * | 2008-01-14 | 2011-04-21 | Feng Huang | Method and system for smart protection of ethernet virtual private-rooted multipoint service |
| WO2010000172A1 (en) * | 2008-06-30 | 2010-01-07 | 华为技术有限公司 | Method, system, receiving end device and multicast source device for multicast protection |
| CN111385519B (en) * | 2018-12-29 | 2021-10-08 | 中兴通讯股份有限公司 | Method, device, terminal and multipoint control unit for realizing video conference recovery |
| CN109787895B (en) * | 2019-03-29 | 2020-10-27 | 烽火通信科技股份有限公司 | Dual-homing protection method, access node, equipment and communication network |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08237253A (en) * | 1995-02-24 | 1996-09-13 | Hitachi Ltd | Method and device for switching virtual path of atm network |
| JP2000083030A (en) * | 1998-09-04 | 2000-03-21 | Nec Corp | Broadcast communication method of atm network and system therefor |
| US6181680B1 (en) * | 1996-03-01 | 2001-01-30 | Fujitsu Limited | Communication monitoring in ATM switch |
| CN1407763A (en) * | 2001-08-24 | 2003-04-02 | 深圳市中兴通讯股份有限公司上海第二研究所 | Protection method for group business stream on wideband switching network |
-
2003
- 2003-06-23 CN CNB031294383A patent/CN1306769C/en not_active Expired - Fee Related
-
2004
- 2004-03-01 WO PCT/CN2004/000159 patent/WO2004114594A1/en active Application Filing
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2005
- 2005-06-28 HK HK05105365A patent/HK1072670A1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08237253A (en) * | 1995-02-24 | 1996-09-13 | Hitachi Ltd | Method and device for switching virtual path of atm network |
| US6181680B1 (en) * | 1996-03-01 | 2001-01-30 | Fujitsu Limited | Communication monitoring in ATM switch |
| JP2000083030A (en) * | 1998-09-04 | 2000-03-21 | Nec Corp | Broadcast communication method of atm network and system therefor |
| CN1407763A (en) * | 2001-08-24 | 2003-04-02 | 深圳市中兴通讯股份有限公司上海第二研究所 | Protection method for group business stream on wideband switching network |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004114594A8 (en) | 2005-03-03 |
| HK1072670A1 (en) | 2005-09-02 |
| WO2004114594A1 (en) | 2004-12-29 |
| CN1567890A (en) | 2005-01-19 |
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