CN1283049C - A passive optical looped network system and broken circuit protecting method - Google Patents
A passive optical looped network system and broken circuit protecting method Download PDFInfo
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- CN1283049C CN1283049C CNB031370969A CN03137096A CN1283049C CN 1283049 C CN1283049 C CN 1283049C CN B031370969 A CNB031370969 A CN B031370969A CN 03137096 A CN03137096 A CN 03137096A CN 1283049 C CN1283049 C CN 1283049C
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Abstract
The present invention discloses a passive optical looped network system and a broken circuit protecting method. The system at least comprises two optical line terminals independent logically, a plurality of optical couplers and a plurality of optical network units, wherein the optical line terminals are connected with the optical couplers into a loop shape via at least one optical fiber. At least one optical coupler is correspondingly connected with one optical network unit via an optical fiber. The method comprises the steps that when a broken circuit appears in the optical fiber of the passive optical looped network, the optical network unit which can communicate with a subsystem of the original optical line terminal still works in the subsystem of the optical line terminal, while the optical network unit, which can not communicate with the subsystem of the original optical line terminal but can communicate with a subsystem of the other optical line terminal, switches to the subsystem of the other optical line terminal to work; the optical network unit which can not communicate with the subsystem of the original optical line terminal or the subsystem of the other optical line terminal is off-line. The system and the method realize the passive looped network with at least one optical fiber, and has the protection function against the broken circuit.
Description
Technical field
The present invention relates to the networking technology of EPON, the method for particularly a kind of EPON loop network system and open circuit protection.
Background technology
Along with the development of optical communication technique and computer networking technology, huge variation has taken place as the backbone network of internet (Internet) core, broadband internet protocol (IP) fiber optic network will replace the Access Network based on copper cash, become the main flow of Access Network.Optical Access Network is divided into active optical network and EPON (PON) two big classes, the link of active optical network must have power supply support just can communicate, as in the prior art with the Resilient Packet Ring (RPR) of twin nuclei networking, adopt two optical fiber that active optical network is linked into double-ring, when wherein an optical fiber generation single-point opens circuit, all business on this optical fiber are transferred on another root optical fiber, guarantee that RPR goes up the communication between the node.On the other hand, when two nodes in the RPR network node roll off the production line, the RPR ring will disconnect, the node of cut-off point both sides can't communicate, and the active equipment on optical transmission chain can't be completely free of influence and the intrinsic maintenance issues of active equipment such as electromagnetic interference and thunder and lightning, so active optical network is not the long-range solution of optical access network.PON is as a kind of prefect dielectric network, link in its network do not need to power and network in node can allow not work, avoided the influence of electromagnetic interference and thunder and lightning effectively to external equipment, reduced breakdown rate, improved the reliability of communication system, so PON is the long-range solution of optical access network.
The networking mode of PON is a tree topology in the prior art, the tree topology of its PON as shown in Figure 1, Fig. 1 is the networking diagram of PON topology tree: this PON mainly is made up of an optical line terminal (OLT), several optical network units (ONU), optical fiber splitter and optical fiber, OLT is also referred to as local side apparatus or proximal device, and ONU is also referred to as remote equipment.An OLT transfers in several ONU by optical fiber splitter, and OLT links to each other by optical fiber with optical fiber splitter, and optical fiber splitter links to each other by optical fiber with ONU, between OLT and the ONU one or more optical fiber splitters can be arranged.
When the optical fiber in the networking of PON topological tree type structure opened circuit, as shown in Figure 1, the follow-up ONU of the optical fiber that opens circuit just can not realize communicating by letter with OLT, has caused the paralysis of PON network.
Summary of the invention
In view of this, one aspect of the present invention provides a kind of EPON loop network system, and this system has realized the EPON looped network, has break protecting.
The present invention provides a kind of method of open circuit protection on the other hand, and this method has solved when the PON fibercuts, can not communicate by letter, cause the problem of PON network paralysis between the ONU of the follow-up PON network of breakaway poing and the OLT.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of EPON loop network system: independently two optical line terminals, a plurality of optical coupler and a plurality of optical network units in logic, optical line terminal and a plurality of optical coupler are linked to be ring-type by at least one optical fiber, optical coupler links to each other by optical fiber is corresponding with optical network unit, and optical network unit constitutes the optical line terminal subsystem by its port with its optical line terminal of communicating by letter.Described in logic independently two optical line terminals by one independently the optical line terminal physical equipment form or by two independently the optical line terminal physical equipment form.Described optical coupler is 2 * 2 optical couplers, and two ports of optical network unit link to each other with one of them port of 2 * 2 optical couplers respectively.Described optical network unit has a port, and optical network unit is operated in one of them optical line terminal subsystem.Described optical network unit has two ports, and described optical network unit is operated in any optical line terminal subsystem or is operated in simultaneously in two optical line terminal subsystems.Described optical network unit has two ports, and the port of described optical network unit carries out work and monitoring respectively.Described optical network unit has two ports, and two ports of described optical network unit carry out load sharing work.
A kind of EPON loop network system open circuit protection method as claimed in claim 1, this method comprises: A, optical network unit constitute each optical line terminal subsystem by each port with its optical line terminal of communicating by letter; B, when the optical fiber that the EPON looped network takes place opens circuit, still in former optical line terminal subsystem, work with the optical network unit that former optical line terminal subsystem can keep communicating by letter; Can not keep communicating by letter with former optical line terminal subsystem but switch to another optical line terminal subsystem work with optical network unit that another optical line terminal subsystem can keep communicating by letter; With former optical line terminal subsystem and the optical network unit off-line that can not communicate by letter with another optical line terminal subsystem.
Switching among the step B comprises: if two ports of B1 optical network unit are load sharing work, then switch not carrying out flow with the work that the optical network unit port of optical line terminal subsystem communication is born, by all work of optical network unit port burden of energy and optical line terminal subsystem communication, up to the optical fiber reparation; If a port is a working port in two ports of B2 optical network unit, another is a listening port, then switch, carry out work by listening port, up to the optical fiber reparation to not carrying out port with the optical network unit working port of optical line terminal subsystem communication.Switching among the step B comprises: when optical network unit had a port, this port of manual switchover was to another subsystem transmitting-receiving light signal.
By such scheme as can be seen, the invention provides a kind of EPON loop network system, not only provide in this system by at least one optical fiber connection OLT and formed the PON looped network, ONU is by PON looped network transmitting-receiving light signal, this OLT can be integrated into an OLT equipment or be two independent OLT equipment, and the ONU that provides can have two ports to link to each other with different OLT subsystems in this PON looped network respectively by optical fiber and optical coupler, in case when the telecommunication optical fiber between port of ONU and the OLT equipment opens circuit, realize communicating by letter between another port that light signal can switch to ONU and another OLT subsystem; Because this optical-fiber network is passive looped network, so when an ONU fault, the ONU and the OLT that do not influence other carry out the transmitting-receiving of light signal, therefore, system and method provided by the invention fundamentally utilizes at least one optical fiber to solve the problem that causes the follow-up PON network paralysis of breakaway poing after the PON fibercuts.
Description of drawings
Fig. 1 is the networking diagram of PON topology tree.
Fig. 2 is an embodiment networking diagram of PON looped network of the present invention.
Fig. 3 is the block diagram of 2 * 2 optical couplers.
Fig. 4 is another embodiment networking diagram of PON looped network of the present invention.
Fig. 5 is connected into the networking key diagram of PON looped network for ONU equipment of the present invention.
Fig. 6 is the realization block diagram of the optical fiber open circuit protection of PON looped network of the present invention.
Fig. 7 realizes another example block diagram of the optical fiber open circuit protection of PON looped network for the present invention.
Fig. 8 realizes an embodiment flow chart of OUT handoff functionality for the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
The present invention at first provides the networking mode of a kind of PON, and the topological structure of this networking mode is a ring-type.As shown in Figure 2, Fig. 2 is an embodiment networking diagram of PON looped network of the present invention, and its specific descriptions are: this PON looped network mainly is made up of two OLT, several ONU, 2 * 2 optical couplers and at least one optical fiber surrounding ring-type.Wherein, 2 * 2 optical couplers are a kind of Passive Optical Components, two-way operation, can be in two wavelength windows operate as normal, one of them wavelength is used to propagate upstream data, another wavelength is used to propagate downlink data; Two OLT are connected to each other, promptly can communicate between two OLT, each ONU inserts OLT by 2 * 2 optical couplers, two ports of ONU link to each other by optical fiber with two corresponding port of 2 * 2 optical couplers respectively, a plurality of 2 * 2 optical couplers link to each other by optical fiber with OLT, and optical fiber connects into a ring network with whole PON.
The structure of 2 * 2 optical couplers as shown in Figure 3, its specific descriptions are: this 2 * 2 optical coupler has four ports, that is: P1 port, P2 port, P3 port, P4 port, these four ports can be received and dispatched light signal, wherein, during P1 port receiving optical signals, P3 port and P4 port send light signal according to predefined ratio, as: suppose to insert loss and be that the P3 port sends 80% of institute's receiving optical signals under 0 the perfect condition, the P4 port sends 20% of institute's receiving optical signals; During P2 port receiving optical signals, P3 port and P4 port send light signal according to predefined ratio; During P3 port receiving optical signals, P1 port and P2 port send light signal according to predefined ratio; During P4 port receiving optical signals, P1 port and P2 port send light signal according to predefined ratio.
Each ONU by the access way that 2 * 2 optical couplers insert OLT is: the P2 port and the P4 port of 2 * 2 optical couplers are inserted in this PON looped network, and P1 port and P3 port insert two ports of ONU respectively; The access way that each ONU inserts OLT by 2 * 2 optical couplers also can for: the P1 port and the P3 port of 2 * 2 optical couplers are inserted in this PON looped network, and P2 port and P4 port insert two ports of ONU respectively.
Described two OLT of Fig. 2 can synthesize an OLT, as shown in Figure 4, Fig. 4 is another embodiment networking diagram of PON looped network of the present invention, and this PON looped network is with the synthetic OLT of two OLT, when two OLT synthesized same OLT, its inside logically still was two OLT.
Port of ONU is realized communicating by letter with an OLT by optical coupler, another port is realized communicating by letter with another OLT by optical coupler, the port of ONU has constituted a subsystem with its OLT that communicates by letter, therefore, when ONU had a port, ONU can be operated in any OLT subsystem; When ONU had two ports, ONU can be operated in two OLT subsystems, and promptly ONU port working is in an OLT subsystem, and another port working is in another OLT subsystem.If each OLT supports the work of 1.25Gb/s full duplex mode, each OLT subsystem has the 1.25Gb/s bandwidth, and then whole PON system provides 2.5Gb/s bandwidth.Other PON networking mode is described the same with Fig. 2.
The ONU that inserts on the PON looped network by 2 * 2 optical couplers can have two kinds of working methods, and a kind of is another port monitoring of a port working of ONU; Another kind of all work for two ports of ONU, still carry out load sharing work, two ports of ONU receive respectively and launch light signal, as: the port one of ONU is shared 50% ONU flow, and port 2 is shared other 50% port flow.
Below with Fig. 2 PON looped network explanation the present invention that two OLT form is described.
When the PON system initialization, two OLT work alone simultaneously and keep communication, each OLT to pass through the PON system and activate ONU online and energising work.
As shown in Figure 5, Fig. 5 is connected into the networking key diagram of PON looped network for ONU equipment of the present invention, its specific descriptions are: the ONU in the PON looped network can be divided into two kinds: a kind of is dual-port ONU, be the 1# among Fig. 5, port one among the dual-port ONU links to each other with two ports of 2 * 2 optical couplers respectively with port 2, this dual-port ONU can be operated in arbitrary OLT subsystem, promptly a port working is in any OLT subsystem, another port is idle port or standby port, perhaps be operated in two OLT subsystems simultaneously respectively, a port working that is ONU is in an OLT subsystem, and another port working is in another OLT subsystem; Another kind is single port ONU, be the 2# among Fig. 5, port among the single port ONU links to each other with a port in 2 * 2 optical couplers, and another port in 2 * 2 optical couplers is an idle port, and this single port ONU can only be operated in one of them OLT subsystem.
When the optical fiber generation single-point that connects the PON looped network opens circuit; as shown in Figure 6; Fig. 6 is the realization block diagram of the optical fiber open circuit protection of PON looped network of the present invention; its specific descriptions are: before generation optical fiber single-point opens circuit; ONU 1#, ONU 2# and ONU 3# work in the 1#OLT subsystem, and ONU 4#, ONU5# and ONU 6# work in the 2#OLT subsystem.Suppose that the optical fiber trip point occurs between ONU 1# and the ONU 2#, after the optical fiber single-point takes place opening circuit, ONU 1# still works in the 1#OLT subsystem, and ONU 2# and ONU 3# will interrupt and the communicating by letter of 1#OLT subsystem simultaneously.At this moment, because ONU3# has standby port 1, still can communicate with the 2#OLT subsystem.Therefore, ONU 3# utilizes standby port 1 to automatically switch to 2#OLT subsystem continuation operation, promptly can finish the optical fiber open circuit protection automatically and switch.And ONU 2# because no standby port can only be manually switched to the 2#OLT subsystem to work on, promptly can't recover automatically.
When having plural breakpoint on the optical fiber that connects the PON looped network; as shown in Figure 7; Fig. 7 realizes another example block diagram of the optical fiber open circuit protection of PON looped network for the present invention; its specific descriptions are: before generation optical fiber opens circuit; ONU 1#, ONU 2# and ONU 3# work in the 1#OLT subsystem; ONU 5# and ONU 6# work in the 2#OLT subsystem, and ONU 4# works in two OLT subsystems simultaneously.Suppose that optical fiber trip point 1 occurs between ONU 1# and the ONU 2#, optical fiber trip point 2 occurs between ONU 3# and the ONU 4#, after generation optical fiber opens circuit, ONU 2# between breakpoint 1 and the breakpoint 2 and ONU 3# off-line simultaneously no longer can operate as normal, at this moment, because ONU 4# has dual-port, and can continue to communicate with 2#OLT, therefore the ONU 4# flow of working on the 1#OLT subsystem before the fibre that will not break switches to the 2#OLT subsystem, and other ONU, ONU 1# for example, ONU 5# and ONU 6# continue operate as normal in original OLT subsystem, get rid of fiber cut failure up to manual intervention.
When the arbitrary ONU fault on the PON looped network, other ONU on the PON looped network still can operate as normal.
As ONU with dual-port, when the optical fiber that one of them port links to each other with subsystem 1#OLT opens circuit, ONU can with its with 2#OLT between communicate by letter and switch on another port of ONU, this port and subsystem 2#OLT realize the transmitting-receiving of light signal, its detailed process as shown in Figure 8, Fig. 8 realizes an embodiment flow chart of PON looped network handoff functionality for the present invention, and its concrete steps are:
Step 802,803, the ONU operate as normal, whether the port of real-time judge ONU opens circuit with the optical fiber that its subsystem OLT links to each other, if open circuit, changes step 804 over to, otherwise ONU continues operate as normal;
Step 804,805, open circuit and alarm and the flow switching, the work that the ONU port that has opened circuit is born switches to the ONU port that does not open circuit, allow the ONU port that does not open circuit bear all work, and the alarm of opening circuit, judge whether switching is successful, if success, change step 806 over to, if failure changes step 807 over to;
Step 806 allows the ONU port that do not open circuit bear all work and alarm, and changes step 808 over to;
Step 809,810, the ONU operate as normal, whether the port of real-time judge ONU opens circuit with the optical fiber that its subsystem OLT links to each other, if open circuit, changes step 811 over to, otherwise ONU continues operate as normal;
Step 811,812, open circuit to alarm and carry out port and switch, the work that the ONU port that has opened circuit is done switches to the ONU listening port, allow the ONU listening port bear all work, and carry out the port switching, judge whether port switches successful, if success, change step 814 over to, if failure changes step 813 over to;
When ONU had single port, the ONU port switching realized that optical signal transceiver can be by manual switchover, and promptly the single port of ONU can not communicate with its subsystem, is manually switched to another port of ONU and its subsystem and communicates.
Realized after optical fiber opens circuit, still realizing the communication function of PON looped network by system and method for the present invention, and can not cause the ONU follow-up can't realize the communication function of PON looped network at the breakpoints of optical fiber place, when a certain ONU fault in the PON looped network, other ONU still can continue operate as normal, the PON looped network provides maximum double system bandwidths, if for full duplex 1.25G system, the bandwidth of full duplex 2.5G can be provided, two ports of ONU are communicated simultaneously and between two OLT subsystems, obtained good effect.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of EPON loop network system, it is characterized in that, this system comprises at least: independently two optical line terminals, a plurality of optical coupler and a plurality of optical network units in logic, optical line terminal and a plurality of optical coupler are linked to be ring-type by at least one optical fiber, optical coupler links to each other by optical fiber is corresponding with optical network unit, and optical network unit constitutes the optical line terminal subsystem by its port with its optical line terminal of communicating by letter.
2, the system as claimed in claim 1 is characterized in that, described in logic independently two optical line terminals by one independently the optical line terminal physical equipment form or by two independently the optical line terminal physical equipment form.
3, the system as claimed in claim 1 is characterized in that, described optical coupler is 2 * 2 optical couplers, and two ports of optical network unit link to each other with one of them port of 2 * 2 optical couplers respectively.
As each described system of claim 1-3, it is characterized in that 4, described optical network unit has a port, optical network unit is operated in one of them optical line terminal subsystem.
As each described system of claim 1-3, it is characterized in that 5, described optical network unit has two ports, described optical network unit is operated in any optical line terminal subsystem or is operated in simultaneously in two optical line terminal subsystems.
As each described system of claim 1-3, it is characterized in that 6, described optical network unit has two ports, the port of described optical network unit carries out work and monitoring respectively.
As each described system of claim 1-3, it is characterized in that 7, described optical network unit has two ports, two ports of described optical network unit carry out load sharing work.
8, a kind of EPON loop network system open circuit protection method as claimed in claim 1 is characterized in that this method comprises:
A, optical network unit constitute each optical line terminal subsystem by each port with its optical line terminal of communicating by letter;
B, when the optical fiber that the EPON looped network takes place opens circuit, still in former optical line terminal subsystem, work with the optical network unit that former optical line terminal subsystem can keep communicating by letter; Can not keep communicating by letter with former optical line terminal subsystem but switch to another optical line terminal subsystem work with optical network unit that another optical line terminal subsystem can keep communicating by letter; With former optical line terminal subsystem and the optical network unit off-line that can not communicate by letter with another optical line terminal subsystem.
9, method as claimed in claim 8 is characterized in that, the switching among the step B comprises:
If two ports of B1 optical network unit are load sharing work, then switch not carrying out flow with the work that the optical network unit port of optical line terminal subsystem communication is born, by all work of optical network unit port burden of energy and optical line terminal subsystem communication, up to the optical fiber reparation;
If a port is a working port in two ports of B2 optical network unit, another is a listening port, then switch, carry out work by listening port, up to the optical fiber reparation to not carrying out port with the optical network unit working port of optical line terminal subsystem communication.
10, method as claimed in claim 8 is characterized in that, this method further comprises: the switching among the step B comprises: when optical network unit had a port, this port of manual switchover was to another subsystem transmitting-receiving light signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031370969A CN1283049C (en) | 2003-06-18 | 2003-06-18 | A passive optical looped network system and broken circuit protecting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031370969A CN1283049C (en) | 2003-06-18 | 2003-06-18 | A passive optical looped network system and broken circuit protecting method |
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| CN1567749A CN1567749A (en) | 2005-01-19 |
| CN1283049C true CN1283049C (en) | 2006-11-01 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1848709B (en) * | 2005-04-14 | 2010-09-08 | 北京格林威尔科技发展有限公司 | Passive optical network system for realizing protection switching and protection switching method |
| CN100496002C (en) * | 2005-09-12 | 2009-06-03 | 中国移动通信集团公司 | Optical fiber access net and its communication protecting method |
| CN101001106B (en) * | 2006-01-13 | 2010-11-17 | 闫晓峰 | Ethern passive light network redundancy protection system using optical power detection and its implementing method |
| CN101001107B (en) * | 2006-01-13 | 2010-11-17 | 闫晓峰 | Ethernet passive optical network redundancy protection system and its implementing method |
| CN101119252B (en) * | 2006-08-01 | 2010-05-19 | 华为技术有限公司 | Access network system, access device, ARP proxy and IP bridging connection forwarding method |
| CN101277152B (en) * | 2007-03-27 | 2012-09-05 | 闫晓峰 | Annular double-bus redundancy protection architecture of passive optical network |
| CN101399614B (en) | 2007-09-26 | 2012-10-03 | 华为技术有限公司 | Protection method, system and device for long distance passive optical network |
| CN101453666B (en) * | 2007-12-07 | 2012-07-04 | 华为技术有限公司 | Main and standby link protection method, loop system and apparatus for passive optical network |
| CN103414510B (en) * | 2013-08-12 | 2016-04-13 | 浙江宇视科技有限公司 | A kind of EPON protection device and method |
| CN112636839A (en) * | 2020-12-21 | 2021-04-09 | 国网浙江淳安县供电有限公司 | EPON repeater device for establishing double-ring self-healing network |
| CN112865871B (en) * | 2020-12-31 | 2022-04-01 | 京信网络系统股份有限公司 | Networking method, networking system and communication method of multi-stage remote equipment |
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