CN101001107B - Ethernet passive optical network redundancy protection system and its implementing method - Google Patents
Ethernet passive optical network redundancy protection system and its implementing method Download PDFInfo
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Abstract
This invention relates to an Ethernet passive optical network redundant protection structure including an OLT, a first optical switch and a second optical switch, at least two sets of POS, several ONU and a control module, in which, the first optical switch is connected with at least two ports of the OLT, the first switch is connected with the second, which is connected with several sets of POS, each ONU is connected with the first POS in each set of POS, and the control module is connected with the system server and two optical switches, several fiber branches connected to the second opticalswitch constitute a redundant protection structure and several OLT ports and several fiber links from the OLT to the first optical switch also constitute a reductant structure.
Description
Invention field
The present invention relates to the redundancy protecting of Ethernet, particularly a kind of ethernet passive optical network (EPON) redundancy protection systems and its implementation.
Background technology
Constantly perfect along with IP (internet protocol) technology, IP technology are as the main bearing technology of data network.Also derive a large amount of access technologies thus based on ethernet technology, Ethernet over PON (based on ethernet passive optical network) notion the transmission structure of the ethernet technology of simple economy and PON (EPON) combines began to cause the extensive attention of technos and Virtual network operator from 2000.In December, 2000, IEEE (electric and Electronic Engineering Association) 802.3 working groups set up an EFM of ad hoc working group (Ethernet in the First Mible) (first mile Ethernet), research and formulation EPON standard.2004, IEEE approval 802.3ah became the standard of EPON.
EPON is the combination of the technology and the network configuration of several the bests.EPON adopts point to multipoint configuration, and the passive fiber transmission means provides multiple business on Ethernet.At present, IP (internet protocol)/Ethernet (Ethernet) uses and accounts for more than 95% of whole local area network communication, and EPON is the most effective a kind of communication means that connects the Access Network end user owing to use above economic and structure efficiently.
EPON does not need the agreement of any complexity, and light signal just can accurately be sent to the end user, can be concentrated from end user's data to be sent to central site network yet.A typical EPON system is made up of OLT (optical line terminal), ONU (optical network unit), POS (passive optical splitter).OLT is positioned at root node, and aspect the united net management of EPON, OLT is main control centre, realizes the major function of network management.POS is an inactive component that connects OLT and ONU.ONU is positioned at user resident side, access user terminal.
The advantage of EPON mainly shows:
(1) relative cost is low, safeguards simply, and expansion easily is easy to upgrading.The EPON structure does not need power supply in the transmission way, do not have electronic unit, therefore lays easily, need not safeguard substantially, and the saving of long-term operation cost and management cost is very big; The EPON system to the local side resource occupation seldom, degree of modularity height, system's initial stage drops into low, expansion easily, the rate of return on investment height; The EPON system is the technology that faces the future, and most of EPON system all is a multiple service platform, well selects for to the complete IP network transition being one.
(2) provide very high bandwidth.EPON can provide the bandwidth of the 1.25Gb/s of up-downgoing symmetry at present, and along with the development of ether technology can be upgraded to 10Gb/s.
(3) service range is big.EPON with the resource that a kind of structure of fan-out is saved CO (central office), serves a large number of users as a kind of point-to-multipoint network.
(4) allocated bandwidth is flexible, serves guaranteed.Distribution and assurance to bandwidth all have a cover rounded system.
The reliability of network be meant break down and the condition of various accidents under, network satisfies the ability of communication requirement at the appointed time.Reliability requirement is the eternal theme of network always.Along with the development and the penetration and promotion of Internet technology, ethernet technology has also obtained development rapidly, makes the range of application of Ethernet enlarge day by day.In a lot of applications,, require network system that redundancy protecting is provided based on reliability requirement.In the industrial automation field, in recent years, ethernet technology has obtained using widely especially.Because industrial particularity requires network system to have very high real-time, stability and reliability, thereby most of requirement that has all proposed network redundancy based on the industrial automation system of Ethernet.
The basic network topology of EPON is some tree structure to multiple spot, has the hidden danger of Single Point of Faliure, influences the reliability of system.Therefore for practical application, especially require the field of high reliability and stability, for example the field is controlled in industrial automation, and bottleneck is used in the EPON existence.
Summary of the invention
The objective of the invention is at above-mentioned application problem, provide a kind of simple and practical, lower-cost ethernet passive optical network redundancy protection systems is to realize effective application of EPON technology.
Another object of the present invention provides a kind of implementation method of ethernet passive optical network redundancy protecting, and a kind of implementation method of redundancy protecting just is provided by above-mentioned redundancy protection systems.
Topology of networks is mainly investigated its connectedness as the important decisive factor of network inherent reliability, i.e. whether the inefficacy of some node or link can make network become disconnected graph, and then cause part or all of network failure.Degree of communication and conjugation are the main reference indexs of tolerance network connectivty.Degree of communication is meant that network becomes disconnected graph and needs the node number that removes at least.Conjugation is meant that network becomes disconnected graph and needs the number of links removed at least.Degree of communication and conjugation are big more, and network reliability is just high more.
At the EPON Access Network, on the one hand, consider from the degree of communication aspect, according to the basic tree topology of EPON as can be known, OLT and ONU lay respectively at root and the leaf of tree, little to the raising of degree of communication influence, reliability that can be by improving the network equipment itself or provide redundance unit to improve the reliability of network.And POS different by its classification position, place and branches are brought great influence to degree of communication, if certain POS lost efficacy, may cause network to be divided into a plurality of disconnected graphs, and all ONU that are not connected with OLT will lose efficacy.On the other hand, consider that during any optical fiber cisco unity malfunction, all can make network be divided into two disconnected subgraphs, in not having the subgraph of OLT, ONU all lost efficacy from conjugation.Therefore, increase the redundancy of POS and optical fiber, will correspondingly improve the connectedness of network, when breaking down, utilize the automatic protection of backup to recover communication, and then improve the reliability of network.
Based on above-mentioned analysis, the object of the present invention is achieved like this: a kind of ethernet passive optical network redundancy protection systems is provided, and this system comprises two optical switches, and described two optical switches interconnect, and first optical switch is connected with two ports of OLT at least; Second optical switch is connected with at least two group POS, and every group of POS comprises some POS, and the some POS among every group of POS are linked in sequence, and the POS in every group is connected with described second optical switch; Two optical switches are used for the path of switching optical path; This structure also comprises some ONU, and each ONU is connected with a POS among described every group of POS correspondingly; Two optical switches also are connected with a control module respectively, control module is connected with system server, is used for communicating with system server the control command of receiving system server, and send control signal to two optical switches according to control command, control the switching of described two optical switches.
Among the present invention, the optical fiber that is connected with a POS among every group of POS by second optical switch, and the POS that is linked in sequence among this group POS and optical fiber thereof constitute branched structure; At least have two described branched structures; Each ONU is connected with a POS among every group of POS correspondingly, thereby forms the redundancy protection architecture with at least two branches.And, OLT port and the shared optical fiber link from OLT to first optical switch of whole ONU have also been carried out redundancy backup.
By said system provided by the invention, the method that is achieved the ethernet passive optical network redundancy protecting is: the state of the some ONU of system's timing scan, when knowing that ONU has improper losing, the different situations that system loses according to ONU, make corresponding judgment according to control logic in advance, make corresponding OLT port enter operating conditions then, and system send control command to control module; After control module received control command, at least one optical switch in first optical switch and second optical switch sent control signal; First optical switch switches the link that it is connected with OLT according to control signal; Second optical switch switches the path of connected light signal according to control signal, thereby realizes the redundancy protecting to optical fiber link.And, when system knows that the OLT port of operating conditions has fault, the out of order OLT port of system closing, and open the OLT port of a backup, and system sends control command to control module; Control module is sent control signal to first optical switch after receiving control command; First optical switch receives control signal, and switches the link that it is connected with OLT according to control signal, thereby realizes the redundancy protecting to OLT port and optical fiber link.
From characteristics of the present invention as can be seen: ethernet passive optical network redundancy protection systems provided by the invention and its implementation can effectively improve the reliability of network, and the fairly simple practicality of this redundancy protecting technology, realize that cost is lower.Because open redundancy structure is very flexible when construction systems, is easy to the expansion of system.Each POS in the structure can customize corresponding splitting ratio, thereby realizes the balancing energy of all ONU receiving terminals, makes system more stable.And each branch can carry out system maintenance when being in non-operation, thereby realizes continual system diagnostics.
Description of drawings
Fig. 1 is the schematic diagram of a kind of ethernet passive optical network net redundancy protection systems according to a preferred embodiment of the invention.
Fig. 2 is the schematic diagram of the implementation method of a kind of ethernet passive optical network redundancy protecting of the present invention.
Embodiment
Describe the preferred embodiments of the present invention and its implementation in detail below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram of a kind of ethernet passive optical network redundancy protection systems according to a preferred embodiment of the invention.With reference to figure 1, OLT10, two port is connected with first optical switch 11 by two optical fiber, and such connected mode is provided the redundancy protecting to OLT port and optical fiber link.First optical switch 11 is connected with second optical switch 12, second optical switch 12 by optical fiber respectively with two groups of POS in a POS131 be connected with 141. Optical switch 11 and 12 all is 1 * 2 optical switch, is used to switch the path of two ways of optical signals.Two groups of POS comprise respectively some POS13i (i=1,2 ..., n) and 14i (i=1,2 ..., n), the some POS among every group of POS are linked in sequence by optical fiber.Some ONU, each ONU15i (i=1,2 ..., n) correspondingly respectively with two groups of POS in POS13i (i=1,2 ..., n) and 14i (i=1,2 ..., n) connect.Optical switch 11 is connected with control module 16 respectively with 12, control module 16 is connected with system server, be used for communicating with system server, the control command of receiving system server, and send control signal according to control command to first optical switch 11 and second optical switch 12, control optical switch 11 and 12 switching.In this preferred embodiment, the optical fiber that second optical switch 12 is connected with POS131, and the some POS13i that are linked in sequence among first group of POS (i=1,2 ..., n) and optical fiber constitute article one and prop up line structure; The optical fiber that second optical switch 12 is connected with POS141, and the some POS14i that are linked in sequence among second group of POS (i=1,2 ..., n) and optical fiber constitute second and prop up line structure; Each ONU15i (i=1,2 ..., n) correspondingly respectively with two branch roads in POS13i (i=1,2 ..., n) and 14i (i=1,2 ..., n) connecting, the structure of this similar herring-bone form forms the redundancy protection architecture with two-way branch.And two OLT ports and two optical fiber links from OLT to first optical switch have also constituted redundancy structure.
Fig. 2 is the schematic diagram of the implementation method of a kind of ethernet passive optical network redundancy protecting of the present invention.With reference to figure 2, a kind of ethernet passive optical network redundancy protection systems according to above preferred embodiment, its implementation is: the some ONU15i of system's timing scan (i=1,2 ... n) state, when knowing that ONU has improper losing, the different situations that system loses according to ONU are made corresponding judgment according to control logic in advance, make corresponding OLT port enter operating conditions then, and system send control command to control module 16; After control module 16 received control command, at least one optical switch in first optical switch 11 and second optical switch 12 sent control signal; According to control signal, first optical switch 11 switches its optical fiber that is connected with OLT; According to control signal, second optical switch 12 switches article one branch road and the second branch road of connected light signal, thereby realizes the redundancy protecting to optical fiber link.Simultaneously, when system knows that the OLT port of operating conditions has fault, the out of order OLT port of system closing, and open the OLT port of another backup, and system sends control command to control module; After control module 16 receives control command, send control signal to first optical switch 11; According to control signal, first optical switch 11 switches its optical fiber that is connected with OLT, thereby realizes the redundancy protecting to OLT port and optical fiber link.
Claims (3)
1. ethernet passive optical network redundancy protection systems is characterized in that comprising:
OLT (optical line terminal);
First optical switch is connected with two ports of described OLT at least, is used for the path of switching optical path;
Second optical switch is connected with described first optical switch, is used for the path of switching optical path;
At least two group POS (passive optical splitter), every group of POS comprises some POS, the some POS among described every group of POS are linked in sequence, and the POS among described every group of POS is connected with described second optical switch;
Some ONU (optical network unit), each ONU are connected with a POS among described every group of POS correspondingly;
A control module is connected with system server, and is connected with second optical switch with described first optical switch, and described control module is communicated by letter with system server and sent control signal to described first optical switch and second optical switch.
2. according to the ethernet passive optical network redundancy protection systems of claim 1, it is characterized in that:
Described first optical switch is connected with two ports of described OLT;
Described second optical switch is connected with two groups of POS;
Described first optical switch and second optical switch are 1 * 2 optical switches.
3. realize it is characterized in that the method for ethernet passive optical network redundancy protectings may further comprise the steps by claim 1 or 2 described ethernet passive optical network redundancy protection systems for one kind:
The state of the some ONU of system's timing scan, when knowing that described ONU has improper losing, corresponding judgment is made according to control logic in advance by system, makes corresponding OLT port enter operating conditions then, and sends control command to control module; Described control module receives control command, sends control signal according to control command at least one optical switch in first optical switch and second optical switch; Described first optical switch receives control signal, and switches the link that it is connected with described OLT according to control signal; Described second optical switch receives control signal, and switches the link that is connected with described second optical switch according to control signal; When system knows that the OLT port of operating conditions has fault, the described OLT port of system closing, and open the OLT port of a backup, and system sends control command to described control module; Described control module receives control command, sends control signal according to control command to described first optical switch; Described first optical switch receives control signal, and switches the link that it is connected with described OLT according to control signal.
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| CN103731200A (en) * | 2013-11-15 | 2014-04-16 | 成都市宏山科技有限公司 | EPON system with redundancy protection function |
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| CN101316140B (en) * | 2008-07-29 | 2012-05-23 | 北京恩易通技术发展有限公司 | Fast protection method of passive optical network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6351582B1 (en) * | 1999-04-21 | 2002-02-26 | Nortel Networks Limited | Passive optical network arrangement |
| CN1567749A (en) * | 2003-06-18 | 2005-01-19 | 华为技术有限公司 | A passive optical looped network system and broken circuit protecting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6351582B1 (en) * | 1999-04-21 | 2002-02-26 | Nortel Networks Limited | Passive optical network arrangement |
| CN1567749A (en) * | 2003-06-18 | 2005-01-19 | 华为技术有限公司 | A passive optical looped network system and broken circuit protecting method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103731200A (en) * | 2013-11-15 | 2014-04-16 | 成都市宏山科技有限公司 | EPON system with redundancy protection function |
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