CN102006525B - Optical communication control device - Google Patents
Optical communication control device Download PDFInfo
- Publication number
- CN102006525B CN102006525B CN 200910171384 CN200910171384A CN102006525B CN 102006525 B CN102006525 B CN 102006525B CN 200910171384 CN200910171384 CN 200910171384 CN 200910171384 A CN200910171384 A CN 200910171384A CN 102006525 B CN102006525 B CN 102006525B
- Authority
- CN
- China
- Prior art keywords
- mentioned
- entrant
- onu
- end device
- protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The invention relates to an optical communication control device which comprises protection switching equipment of an optical network unit on a passive optical network system. A subscriber side device is connected with a local side device through an optical branching device, communicates with the local side device, is provided with a communication unit, and communicates with a plurality of other subscriber side devices connected with the common optical branching device; when optical signals from the local side device do not arrive after passing through the optical branching device, signals are received from a plurality of subscriber side devices in the plurality of other subscriber side devices through the communication unit; the local side device is provided with a detecting unit for detecting whether a part of subscriber side devices at which the optical signals can not arrive exist; and under the condition that the detecting unit detects that the optical signals transmitted to the part of subscriber side devices in the plurality of subscriber side devices can not arrive, the optical signals are transmitted to the part of the subscriber side devices through the plurality of subscriber side devices other than the part of subscriber side devices.
Description
Technical field
The present invention relates to the optical communication control device, particularly adjacent light network element (ONU) realizes the equipment that protection is switched in EPON (PON:PassiveOptical Network) system.
Background technology
Passive optical network is between network and user, formed by the optical link terminal (OLT:Optical Line Terminal) that connects network, passive optical branching device (Splitter) and optical network unit (ONU:Optical Network Unit), carry out physical connection by optical fiber between optical link terminal, optical branching device and the optical network unit, adjacent ONU connects by user side interface in wired or wireless mode.Passive optical network has low expense, high-efficiency characteristics, therefore becomes a kind of possible solution that solves Access Network bandwidth bottleneck problem.The PON system provides the high speed fibre user network of high bandwidth, long Distance Transmission for the user.The PON system provides the net of the transmission between user and the core network.The PON system has the structure of optical user network, connects the tree topology that the optical link terminal is formed by a plurality of optical network units.
Growth along with the Access Network broadband services; people require also more and more higher to reliability and the survivability of broadband networks; because Access Network directly converges customer service to Access Network; and the PON network is carrying vast capacity information; communication disruption will be brought enormous economic loss; society caused have a strong impact on, therefore the protection to the PON system seems extremely important.In the prior art, be primarily aimed at OLT and trunk optical fiber backup protection method and at the general modes of considering double copies of the embodiment of other dried optical fiber and ONU fault more, cost price is big.
In order to address the above problem, american documentation literature US006288806B1 (exercise question is " user's optical network system and fault monitoring method thereof ") has proposed a kind of method.Particularly, the fault of monitoring ONU, the communication concrete which ONU of notice OLT fault has taken place and recovered this faulted ONU by the link of adjacent ONU.
Summary of the invention
But the method for mentioning in american documentation literature US006288806B1 has only realized the physical link protection of adjacent ONU, and the system resource of faulted ONU has not been done any consideration, thereby caused waste of network resources.
Therefore, also there are the following problems in current PON system:
(1) some business can not be recovered automatically, unless carry out system restart.For example in the VoD business, when fault took place, the user was watching the VoD video, then after the link-recovery communication by adjacent ONU, this VoD business can not be recovered automatically, because adjacent ONU can not receive the downlink data packet that has the faulted ONU LLID.Therefore, if the user will continue to watch this VoD business, must rebulid VoD and connect, rather than recover the VoD connection automatically.
(2) the adjacent ONU that switches as protection can not take full advantage of the system resource of faulted ONU, as LLID, Dynamic Bandwidth Allocation etc.
The present invention proposes in view of the above problems; purpose is to provide protection reverse method and the equipment of a kind of PON system; adjacent ONU connects by user side interface in wired or wireless mode; and can when breaking down, realize giving mutual protection; realize the reasonable utilization of PON system resource by the distribution of carrying out system resources such as LLID, bandwidth again; provide effective PON system protection to switch, thereby can take full advantage of PON system resource.In addition, the present invention does not need to carry out the redundant link construction, has good and economic.
The invention provides a kind of entrant's end device, be connected with the local side device by optical branching device, and communicate with above-mentioned local side device, it is characterized in that, possesses communication unit, this communication unit is used for communicating with a plurality of other the entrant's end devices that are connected on the common above-mentioned optical branching device, from above-mentioned local side device and passed through under the situation that light signal that above-mentioned optical branching device sends to entrant's end device can not arrive, entrant's end device that above-mentioned light signal can not arrive is by above-mentioned communication unit, and a plurality of entrant's end devices beyond this entrant's end device receive above-mentioned light signal.
As the described entrant's end device of above-mentioned technical scheme; it is characterized in that; also have detecting unit and control unit; above-mentioned detecting unit is for detection of the current Link State of entrant's end device; store protection in the above-mentioned control unit and switch table; described protection is switched to store in the table to protect and is switched entrant's end device identifier; detecting at above-mentioned detecting unit that above-mentioned light signal can not arrive is under the situation of link failure; above-mentioned control unit is switched entrant's end device identifier according to above-mentioned protection, sends fault-signal by other entrant's end device of being switched the appointment of entrant's end device identifier by protection to above-mentioned local side device.
As the described entrant's end device of above-mentioned technical scheme, it is characterized in that, store the system resource allocation table in the above-mentioned control unit, store a plurality of link informations in the described system resource allocation table, each link information comprises port identifiers and MAC Address, above-mentioned entrant's end device also has the ports filter unit, above-mentioned control unit is according to the port identifiers in the said system resource allocation table, utilize the filtration of above-mentioned ports filter unit and reception from the light signal of above-mentioned local side device, respectively with reference to the MAC Address corresponding with above-mentioned port identifiers, above-mentioned filtered data is sent to the corresponding entrant's end device of above-mentioned MAC Address then.
As the described entrant's end device of above-mentioned technical scheme, it is characterized in that also store distribution marker, dynamic bandwidth allocation value and main broadband value in the said system resource allocation table, wherein above-mentioned distribution marker is corresponding one by one with above-mentioned dynamic bandwidth allocation value.
As the described entrant's end device of above-mentioned technical scheme, it is characterized in that, include above-mentioned link information and bandwidth allocation information in the light signal from the local side device, described bandwidth allocation information comprises distribution marker and dynamic bandwidth allocation value, and above-mentioned control unit upgrades information in the said system resource allocation table according to above-mentioned link information and above-mentioned bandwidth allocation information.
As the described entrant's end device of above-mentioned technical scheme, it is characterized in that, above-mentioned communication unit comprises main interface and spare interface, at the current link of entrant's end device just often, communicate by above-mentioned main interface and other entrant's end device, when the current link failure of entrant's end device, communicate by above-mentioned spare interface and above-mentioned main interface and other entrant's end device.
As the described entrant's end device of above-mentioned technical scheme, it is characterized in that also having data processing unit, this data processing unit provides the function of the transmission convergence layer in the optical-fiber network.
As the described entrant's end device of above-mentioned technical scheme, it is characterized in that also having the optical distribution network interface, this optical distribution network interface is provided at the data transformation function when carrying out transfer of data in the optical distribution network.
A kind of local side device of the present invention, be connected with a plurality of entrant's end devices by common optical branching device, and communicate with above-mentioned a plurality of entrant's end devices, it is characterized in that, possesses detecting unit, this detecting unit detects a part of entrant's end device that whether exists above-mentioned light signal to arrive, detect under the situation that light signal that a part of entrant's end device in above-mentioned a plurality of entrant's end devices sends can not arrive at above-mentioned detecting unit, other a plurality of entrant's end devices by beyond this part entrant end device send above-mentioned light signal to above-mentioned a part of entrant's end device.
As the described local side device of above-mentioned technical scheme; it is characterized in that; also possesses control unit; store protection in this control unit and switch table; entrant's end device identifier of storing above-mentioned a plurality of entrant's end devices in the table is switched in described protection and entrant's end device identifier is switched in a plurality of protections corresponding with each entrant's end device identifier; detecting at above-mentioned detecting unit that above-mentioned light signal can not arrive is under the situation of link failure; entrant's end device identifier is switched in the protection that above-mentioned control unit is switched table with reference to above-mentioned protection; select a plurality of protections corresponding with entrant's end device of generation link failure to switch entrant's end device, and switch entrant's end device by selected a plurality of protections and send above-mentioned light signal to entrant's end device of above-mentioned generation link failure.
As the described local side device of above-mentioned technical scheme; it is characterized in that; also store the system resource allocation table in this control unit; store a plurality of entrant's end device identifiers in the described system resource allocation table; and respectively with each entrant's end device identifier corresponding port identifier; distribution marker; MAC Address; dynamic bandwidth allocation value and main broadband value; wherein above-mentioned distribution marker is corresponding one by one with a plurality of dynamic bandwidth allocation values; above-mentioned control unit switches entrant's end device for above-mentioned a plurality of protections link and allocated bandwidth that entrant's end device of link failure takes place according to the symbol of the port identification in the system resource allocation table and dynamic bandwidth allocation value.
As the described local side device of above-mentioned technical scheme; it is characterized in that; after the link of entrant's end device that link failure will take place and allocated bandwidth switch entrant's end device for above-mentioned a plurality of protections; switch the relevant information of entrant's end device with above-mentioned a plurality of protections in the above-mentioned control unit update system resource allocation table; above-mentioned control unit is switched entrant's end device to above-mentioned a plurality of protections and is sent above-mentioned light signal; comprise the data that entrant's end device of above-mentioned generation link failure is asked in the described light signal; link information and bandwidth allocation information; described link information comprises port identifiers and MAC Address, and described bandwidth allocation information comprises distribution marker and dynamic bandwidth allocation value.
As the described local side device of above-mentioned technical scheme, it is characterized in that also having business interface, this business interface provides business interface in the optical-fiber network zone and the conversion of transmission convergence layer frame interface.
As the described local side device of above-mentioned technical scheme, it is characterized in that also having data processing unit, this data processing unit provides the function of the transmission convergence layer in the optical-fiber network.
As the described local side device of above-mentioned technical scheme, it is characterized in that also having the optical distribution network interface, this optical distribution network interface is provided at the data transformation function when carrying out transfer of data in the optical distribution network.
The invention provides a kind of passive optical network, comprise a plurality of entrant's end devices, optical branching device drawn game end device, above-mentioned a plurality of entrant's end device is connected with above-mentioned local side device by above-mentioned optical branching device, and communicate with above-mentioned local side device, it is characterized in that, above-mentioned a plurality of entrant's end device is the entrant's end device described in technical scheme 1～8, and above-mentioned local side device is the local side device described in technical scheme 9～15.
According to technique scheme; in when, between ONU and OLT link failure taking place; thereby adjacent ONU utilizes user side interface to connect in wired or wireless mode and realizes giving mutual protection; and realize the reasonable utilization of PON system resource by the distribution of carrying out system resources such as LLID, bandwidth again; provide effective PON system protection to switch thus, and can take full advantage of PON system resource.In addition, the present invention does not need to carry out the redundant link construction, has good and economic.
Description of drawings
Fig. 1 is that adjacent ONU protects the structure chart of switching in the GPON system.
Fig. 2 is that adjacent ONU protects the functional block diagram of switching in the GPON system.
Fig. 3 is the cut-away view of the control module in the OLT.
Fig. 4 is the cut-away view of the control module in the ONU.
Fig. 5 is that the example that table is switched in the protection of ONU under the situation is switched in protection in 1: 1.
Fig. 6 is the example that PON system resource allocation table under the situation is switched in protection in 1: 1.
Fig. 7 is that the example that table is switched in protection in the ONU under the situation is switched in protection in 1: 1.
Fig. 8 is the example that the PON system resource allocation table in the ONU under the situation is switched in protection in 1: 1.
Fig. 9 is the example that the PON system resource allocation table in the ONU under the situation is switched in protection in 1: 1.
Figure 10 is 1: the system construction drawing when the N protection is switched.
Figure 11 is 1: the example that table is switched in ONU protection under the situation is switched in N protection.
Figure 12 is 1: an example of PON system resource allocation table under the situation is switched in the N protection.
Figure 13 is 1: the example that table is switched in the protection in the ONU under the situation is switched in N protection.
Figure 14 is 1: an example of the PON system resource allocation table in the ONU under the situation is switched in the N protection.
Figure 15 is that adjacent ONU realizes the flow chart that protection is switched among the present invention.
Figure 16 is the system resource allocation flow chart that the faulted ONU under the situation is switched in protection in 1: 1.
Figure 17 is 1: the system resource allocation flow chart of the faulted ONU under the situation is switched in the N protection.
Figure 18 realizes message that adjacent ONU protection is switched and an example of data conveying flow.
Figure 19 is GPON system transmissions convergence-level downlink data frame structure and upstream bandwidth distribution diagram.
Figure 20 is the message structure figure that distributes Alloc-ID.
Figure 21 is the message structure figure that distributes Port-ID.
Embodiment
Below, by reference to the accompanying drawings with form description the preferred embodiments of the present invention.In the accompanying drawings, even same or analogous parts are presented among the different figure, also represent with identical Reference numeral.The present invention can be embodied as various form, not only is confined to the listed execution mode of enumerating in this specification.In the scope that does not break away from aim of the present invention, can carry out suitable change to the present invention.
The invention describes the method and apparatus that adjacent light network element (ONU) realization protection is switched in the passive optical network (PON); and realize the reasonable utilization of PON system resource providing effective PON system protection to switch by the distribution of carrying out system resources such as LLID, bandwidth again.
Gbit passive optical network system (hereinafter to be referred as the GPON system) is one of PON system of knowing of people.In the GPON system, logical links is known as port (Port), and correspondingly, logical link identifier is known as port numbers (being also referred to as port identifiers, hereinafter to be referred as Port-ID).In description of the invention, the GPON system is described as an instantiation of PON system.
Fig. 1 is that adjacent ONU protects the structure chart of switching in the GPON of the present invention system 100.GPON system 100 comprises that the optical link terminal (is equivalent to the local side device among the present invention, be designated hereinafter simply as OLT) 101, passive optical branching device 102 (being equivalent to the optical branching device among the present invention) and a plurality of optical network unit (being equivalent to the entrant's end device among the present invention, hereinafter to be referred as ONU) 103.OLT 101 and ONU 103 are by optical fiber 104 physical connections.
As shown in Figure 1, the client of ONU 103 connects by wired or wireless mode, to realize giving mutual protection between the adjacent ONU 103.That is, ONU 1103-1 is for the protection of ONU 2103-2, and ONU 2 103-2 are for the protection of ONU 1 103-1 simultaneously.Also adopt between other the ONU 103 and realize in the same way giving mutual protection.
Fig. 2 is that adjacent ONU protects the functional block diagram of switching in the GPON of the present invention system 100.Wherein, OLT 101 comprises business interface 201, Port-ID distribution module 202, data processing module 203, optical distribution network (ODN:Optical Division Network) interface 204, fault detection module 205 and control module 206.Wherein, above-mentioned fault detection module 306 is equivalent to the detecting unit in the local side device of the present invention, and above-mentioned control module 307 is equivalent to the control unit in the local side device of the present invention.
Business interface 201 provides the conversion of business interface and transmission convergence layer (TC:Transmission Convergence) frame interface in PON zone.Port-ID distribution module 202 is carried out Port-ID according to the purpose ONU 103 of the data of passing through and is divided to be equipped with and distinguish different data flow under the control of above-mentioned control module 206.Data processing module 203 provides the function of TC layer, comprise framing, the medium access control, move, manage, safeguard (OAM:Operation, Administration andMaintenance), Dynamic Bandwidth Allocation (DBA:Dynamic Bandwidth Assignment), the demarcation of protocol Data Unit, the management of ONU and cross-level function etc.ODN interface function 204 provides the data transformation function to be applicable to the transfer of data among the ODN.Fault detection module 205 is analyzed the state of current PON system 100 by the state information of monitoring OLT101 and ONU 103, detects whether there is link failure.Link failure among the present invention can refer to can not arrive from the light signal of above-mentioned OLT101 the state of ONU 103, though also can refer to can arrive ONU 103 from the light signal of above-mentioned OLT101, velocity anomaly is state slowly.Control module 206 is by receiving from Port-ID distribution module 202, and the message of data processing module 203 and fault detection module 205 realizes the normal operation of PON system 100 and the distribution of system resource.Internal structure about control module 206 will describe in conjunction with Fig. 3 in the back.
The functional module of the functional module of ONU 103 and OLT 101 is similar, comprises ODN interface 301, Port-ID filter 302, data processing module 303, main interface 304, spare interface 305, fault detection module 306 and control module 307.Above-mentioned Port-ID filter 302 is equivalent to the ports filter unit in entrant's end device among the present invention, above-mentioned main interface 304 and spare interface 305 are equivalent to the communication unit in entrant's end device of the present invention, above-mentioned fault detection module 306 is equivalent to the detecting unit in entrant's end device of the present invention, and above-mentioned control module 307 is equivalent to the control unit in entrant's end device of the present invention.
ODN interface 301 is identical with the function of definition in the ODN interface function 204.Port-ID filter 302 receives by the downlink data of Port-ID that filters downlink data.Because ONU 103 only handles a PON interface (perhaps in order to protect maximum 2 PON interfaces), data processing module 303 is compared the data processing module 203 of OLT 101, has simple relatively structure.Main interface 304 is used for being connected between normal course of communications ONU 103 and the client, the connection of the physical link realization communication recovery by adjacent ONU 103 when the communication link that spare interface 305 is used for certain ONU 103 breaks down.Fault detection module 306 is analyzed the state of current link by the state information of monitoring ONU 103.Control module 307 is by receiving from Port-ID filter 302, and the message of data processing module 303 and fault detection module 306 realizes the control to ONU 103, and control module 307 is also controlled main interface 304 and spare interface 305 simultaneously.When ONU 103 carried out proper communication, the transfer of data of client only realized by main interface 304; When the communication link of ONU 103 broke down, the transfer of data of client realized jointly by main interface 304 and spare interface 305.Internal structure about control module 307 will describe in conjunction with Fig. 4 in the back.
Fig. 3 is the cut-away view of the control module 206 in the OLT 101.Control module 206 comprises fault detect controller 207, Port-ID dispensing controller 208, DBA (Dynamic BandwidthAllocation Dynamic Bandwidth Allocation) controller 209 and control centre 210.
The message that fault detect controller 207 receives from fault detection module 205, and select adjacent ONU 103 as the protection link.Port-ID dispensing controller 208 is carried out the Port-ID value according to the purpose ONU103 that transmits data and is distributed.The bandwidth resources of 209 pairs of PON systems 100 of DBA controller are distributed control.Control centre 210 is the core of The whole control module 206, switches table 211 and PON system resource allocation table 212 comprising the ONU protection.Fault detect controller 207, Port-ID dispensing controller 208 and DBA controller 209 are switched table 211 and PON system resource allocation table 212 by inquiry ONU protection respectively and are realized that the protection of PON link switches the distribution with PON system resource.Control centre 210 is by from fault detect controller 207, the message of Port-ID dispensing controller 208 and DBA controller 209 to ONU protection switch table 211 and PON system resource allocation table 212 upgrades.
Fig. 4 is the cut-away view of the control module 307 in the ONU 103.Control module 307 comprises fault detect controller 308, Port-ID filter controller 309, data multiplex/demultiplex controller 310, main interface controller 311, spare interface controller 312 and control centre 313.
The message that fault detect controller 308 receives from fault detection module 306, and the operating state of control fault detection module 306.Port-ID filter controller 309 arranges different threshold value realizations to the control of Port-ID filter 302 by giving Port-ID filter 302.The mode that data multiplex/demultiplex controller 310 inserts by time division multiplexing/time division multiple access realizes the multiplex/demultiplex control to data.Management and control that main interface controller 311 is realized main interface 304, and the data-transformation facility between control opening and closing main interface 304 and the spare interface 305.Management and control that spare interface controller 312 is realized spare interface 305, control opening and closing spare interface 305.Control centre 313 is the core of The whole control module 307, switches table 314 and PON system resource allocation table 315 comprising the protection of ONU 103.Fault detect controller 308; Port-ID filter controller 309; data multiplex/demultiplex controller 310, main interface controller 311 and spare interface controller 312 switch table 314 by the protection of inquiry ONU 103 and PON system resource allocation table 315 is realized the link protection change of ONU 103 and the distribution of PON system resource.Control centre 313 is by switching table 314 from the message of the control centre 210 of the control module 206 of OLT 101 to the protection of ONU 103 and PON system resource allocation table 315 upgrades.
Fig. 5 is that the example that table 211 is switched in ONU protection under (that is, ONU 103-1 have only a backup ONU 103-n) situation is switched in protection in 1: 1.The ONU protection is switched table 211 and is comprised ONUID (ONU Identifier: optical network unit marks accords with) 213 and protection ONU ID 214.ONU ID213 is used for the current ONU 103 of sign, namely needs protected ONU 103.Protection ONU ID 214 is used for sign and switches the ONU 103 of usefulness as protection.As shown in Figure 5, ONU 1 103-1 and ONU2 103-2 are the adjacent ONU that gives mutual protection and switch.Similarly, ONU 3 103-3 and ONU 4 103-4 are the adjacent ONU that gives mutual protection and switch.
Fig. 6 is the example that PON system resource allocation table 212 under the situation is switched in protection in 1: 1, supposes that link failure takes place ONU 1 103-1, and ONU 2 103-2 switch ONU as protection.PON system resource allocation table 212 comprises ONU ID 213, Port-ID 215, Alloc-ID (AllocationIDentifier: distribution marker) 216, U/D MAC (Upstream/Downstream MAC: on/descending MAC Address) 217, DBA 218 and total bandwidth 219.Wherein, Port-ID 215 and U/DMAC 217 are equivalent to the link information among the present invention, Alloc-ID216 and DBA 218 are equivalent to the bandwidth allocation information among the present invention, as Fig. 6 and shown in Figure 12, Port-ID 215 and U/D MAC 217 are corresponding one by one, and Alloc-ID216 and DBA 218 are also corresponding one by one.
When ONU 1 103-1 breaks down, the ONU that ONU 2 103-2 switch as protection.Therefore, as shown in Figure 6, Port-ID 215-1 and Alloc-ID 216-1 are assigned to the data that ONU 2103-2 is used for transmission ONU 1 103-1.Simultaneously, DBA 218-1 is assigned to ONU 2 103-2, and then the total bandwidth of ONU 2 103-2 adds DBA 218-2W2 for DBA 218-1W1.
Fig. 7 is that the example 314-1 that table 314 is switched in protections in the ONU under the situation 103 is switched in protection in 1: 1.It is parts that table 211 is switched in the ONU protection that table 314 is switched in protection, includes only for the protection of the ONU ID 214 that switches.
Fig. 8 is the example 315-1 that the PON system resource allocation table 315 in the ONU 103 under the situation is switched in protection in 1: 1.PON system resource allocation table 315 is parts of PON system resource allocation table 212, only comprises the content relevant with ONU 1 103-1.
Fig. 9 is the example 315-2 that the PON system resource allocation table 315 in the ONU 103 under the situation is switched in protection in 1: 1.PON system resource allocation table 315 is parts of PON system resource allocation table 212, only comprises the content relevant with ONU 2 103-2.
Described above is that situation and PON system resource allocation situation are switched in the ONU protection that protection in 1: 1 is switched under the situation.Ensuing Figure 10～Figure 14 is to 1: N (when an ONU broke down, an adjacent n ONU protected it) protects the ONU protection of switching under the situation to switch situation and PON system resource allocation situation is described.
When an ONU provides enough protections to switch can not for the ONU1 that breaks down, 1: the protection Switch mode of N will be used, and namely a plurality of ONU are used to protect simultaneously an ONU who breaks down.In this case, OLT can distribute other standby Port-ID to distinguish the data flow of faulted ONU.
Figure 10 is 1: the system construction drawing when N (N 〉=2) protection is switched.Suppose that ONU 1 103-1 breaks down, then ONU 2 103-2 and ONU 3 103-3 are used to ONU 1 103-1 protected and switch.
Figure 11 is 1: the example that table 211 is switched in ONU protection under the situation is switched in N protection.The place that Figure 11 is different from Fig. 5 is corresponding to an ONU ID 214 protection ONU ID215 greater than one is arranged.As shown in figure 11, ONU 2 103-2 and ONU 3 103-3 are used to ONU 1 103-1 protected and switch.
Figure 12 is 1: an example of PON system resource allocation table 212 under the situation is switched in N protection, supposes that ONU 1 103-1 breaks down, and then ONU 2 103-2 and ONU 3 103-3 are used to ONU1 103-1 protected and switch.The place that is different from Fig. 6 is that each protected ONU has been assigned with a standby Port-ID 215 and Alloc-ID 216, and DBA 218 is divided into two parts W11 and W12 simultaneously.Total bandwidth W1 is that W11 adds W12.
As shown in figure 12, Port-ID 1 and Port-ID 256 can be used for transmitting the data of ONU 1 103-1 by ONU 2 103-2 and ONU 3103-3 respectively, simultaneously, ONU 2 103-2 and ONU 3 103-3 obtain up DBA W11 and the W12 of ONU 1 103-1 respectively.So the total bandwidth of ONU 2 103-2 and ONU 3 103-3 is respectively W2 and adds that W11 and W3 add W12.
Illustrate, if W11=80%*W1, W12=20%*W1, then ONU 2 103-2 will obtain the bandwidth resources of 80% ONU 1 103-1, and ONU 3 103-3 will obtain the bandwidth resources of 20% ONU 1103-1.
Figure 13 is 1: the example 314-1 that table 314 is switched in protections in the ONU 103 under the situation is switched in N protection.The place that Figure 13 is different from Fig. 7 is to have corresponding to a faulted ONU two or more protection ONU.
Figure 14 is 1: an example 315-3 of the PON system resource allocation table 315 in the ONU 103 under the situation is switched in the N protection.The place that Figure 14 is different from Fig. 9 is that ONU 3 103-3 have been assigned with the standby Port-ID 215 of ONU1 103-1, Alloc-ID 216 and bandwidth W12.
Figure 15 is that adjacent ONU realizes the flow chart that protection is switched among the present invention.Figure 15 breaks down with ONU 1103-1 and is example, and adjacent ONU is realized protecting to switch being described.In step 401 and 402, the control module 211 of OLT 101 and the control module 307 of ONU 103 obtain initialization respectively.That is, make that the information in above-mentioned each table all keeps up-to-date state, and make ONU protection switch that table 211 is consistent with information in 314, PON system resource allocation table 212 is also consistent with the fresh information in 315.After initialization procedure finished, ONU ID 213, protection ONU ID 214, Port-ID 215, Alloc-ID (Allocation Identifier-allocation identification) 216, U/D MAC Address 217, DBA 218 and total bandwidth 219 that table 211 and PON system resource allocation table 212 are switched in the ONU protection obtained upgrading.Correspondingly, ONU protection is switched table 314 and PON system resource allocation table 315 also obtains upgrading.
After the initialization; in step 404; whether fault detection module 306-1 inquiry ONU 1 103-1 of ONU 1 103-1 breaks down; if above-mentioned fault detection module 306-1 detects ONU 1103-1 link occurs fault; then in step 405; above-mentioned control module 307 is switched protection ONU ID 214 in the table 314 according to the protection of above-mentioned ONU 1103-1, by by the specified adjacent ONU of protection ONU ID 214, sends the fault message of above-mentioned ONU 1 103-1 to OLT 101.In step 406; OLT 101 judges whether to receive this failure message; if OLT 101 acknowledges receipt of the failure message of ONU 1 103-1, then the adjacent ONU link of ONU 1 103-1 is checked, provide protection to switch can for faulted ONU 1 103-1 to judge.Otherwise if the fault detection module 306-1 of ONU 1 103-1 does not detect the fault generation in step 404, then the fault detection module 306-1 of ONU 1 103-1 can monitor and circulate a notice of constantly the state of ONU 1 103-1.In step 406, OLT 101 does not receive the failure message that ONU1 103-1 sends if ONU 1 103-1 has sent failure message, and then ONU 1 103-1 can resend this failure message, till OLT 101 makes feedback.
In step 407; the control module 206 of OLT 101 is switched the protection ONU ID 214 in the table 211 and is selected the protection of ONU 1 103-1 to switch the adjacent ONU 2103-2 of usefulness with reference to above-mentioned ONU protection, and whether adjacent ONU 2 103-2 that usefulness is switched in the protection of judging ONU 1 103-1 can provide enough resource protections to switch to ONU 1 103-1.Judge whether that the resource that can provide enough has a plurality of modes, for example, between the ONU under the situation of wireless connections, the bandwidth of supposing these wireless connections is 20M, and the required bandwidth of faulty link is 30M, in this case, adjacent ONU 2103-2 provides enough resources just can not for ONU 1 103-1.
If ONU 2 103-2 provide enough resource protections to switch can for ONU 1 103-1, then advance to step 410.In step 410; the control module 206 of OLT 101 is set to protection with ONU 2 103-2 and switches link; then; in step 411; this control module 206 is according to the information in the PON system resource allocation table 212 of above-mentioned OLT 101; the system resource of ONU 1 103-1 is assigned to ONU 2 103-2, and described system resource comprises link circuit resource and the bandwidth of ONU 1 103-1.Detailed content about step 411 16 describes with reference to the accompanying drawings.
In step 407; if ONU 2 103-2 provide enough resource protections to switch can not for ONU 1 103-1; then the control module 206 of OLT 101 is switched a plurality of protection ONU ID 215 in the table 211 according to above-mentioned protection; select 103 couples of ONU 1 103-1 of a plurality of adjacent ONU to protect and switch, suppose to have selected ONU 2 103-2 and ONU 3 103-3.Then in step 412; switching ONU in determined protection compares under the situation that has taken place to change with the protection ONU ID 215 that above-mentioned protection is switched in the table 211; the control module 211 of OLT 101 is upgraded and is protected the protection switch messages of switching in the table 211, advances to step 414 then.In step 414, ONU 2 103-2 and ONU 3 103-3 are set to protection and switch link, and then, in step 415, the system resource of ONU 1 103-1 is assigned to ONU 2 103-2 and ONU 3 103-3.Detailed content about step 415 17 describes in detail with reference to the accompanying drawings.
In step 416, the spare interface 305-1 of 312 couples of ONU 1 103-1 of above-mentioned spare interface controller upgrades.In step 417, the main interface 304-1 of 311 couples of ONU 1 103-1 of above-mentioned main interface controller upgrades.In step 418, whole communications of ONU 1 103-1 recover fully by the protection link then.In step 419, protect the whole process of switching to finish to ONU 1 103-1 that breaks down.
Figure 16 has described protection in 1: 1 and has switched the flow chart of the system resource allocation of the faulted ONU under the situation.
As shown in figure 16, after ONU 2 103-2 were set to protect and switch link, in step 502, above-mentioned control module 206 was distributed to ONU 2 103-2 with the Port-ID 1 of ONU 1 103-1.In step 503, ONU 2 103-2 detect the assignment messages of whether receiving Port-ID 1, if ONU 2103-2 receives the assignment messages of Port-ID 1, then in step 504, the Port-ID filter 302-2 of ONU 2 103-2 obtains upgrading.In step 505; above-mentioned control module 206 is assigned to ONU 2 103-2 with the upstream bandwidth W1 of ONU 1 103-1; make that the up total bandwidth of ONU 2 103-2 is that W1 adds W2; and above-mentioned control module 206 is sent light signal, and described light signal comprises data, protection switch messages, link information and the bandwidth allocation information that ONU 1 103-1 of above-mentioned generation link failure asks.The control module 307 of each ONU receives these signals, utilizes above-mentioned protection switch messages, above-mentioned link information and above-mentioned bandwidth allocation information, and the protection in each ONU is switched table 314 and PON system resource allocation table 315 upgrades.In step 506, the data processing module of ONU 2 103-2 obtains upgrading then.In step 507, the spare interface 305-2 of ONU 2 103-2 obtains upgrading.In step 508, the system resource allocation that faulted ONU 1 103-1 under the situation is switched in protection in 1: 1 finishes at last, and the system resource of ONU 1 103-1 is used by ONU 2 103-2.In addition, if ONU 2 103-2 do not receive and the assignment messages of Port-ID 1 then come back to step 502 in step 503.
Figure 17 has described 1: the flow chart of the system resource allocation of the faulted ONU under the situation is switched in the N protection.
As shown in figure 17; be set to after protection switches link at ONU 2 103-2 and ONU 3 103-3; in step 602, above-mentioned control module 206 is distributed to ONU 2 103-2 with the Port-ID 1 of ONU 1 103-1, and the Port-ID 256 of ONU 1 103-1 is distributed to ONU 3 103-3.In step 603, ONU 2 103-2 and ONU 3 103-3 detect the assignment messages of whether receiving Port-ID 1 and Port-ID 256, if ONU 2 103-2 receive the assignment messages of Port-ID 1, ONU 3103-3 receives the assignment messages of Port-ID 256 simultaneously, then in step 604, the Port-ID filter 302-3 of the Port-ID filter 302-2 of ONU 2 103-2 and ONU 3 103-3 obtains upgrading.In step 605, above-mentioned control module 206 is distributed to ONU 2 103-2 and ONU 3 103-3 with the upstream bandwidth W1 of ONU 1 103-1, makes that the up total bandwidth of ONU 2 103-2 is that W11 adds W2, and the up total bandwidth of ONU 3103-3 is that W12 adds W3.In step 606, the data processing module of ONU 2 103-2 and ONU 3 103-3 obtains upgrading then.In step 607, the spare interface 305-3 of the spare interface 305-2 of ONU 2 103-2 and ONU 3 103-3 obtains upgrading.In step 608,1: the system resource allocation that faulted ONU 1 103-1 under the situation is switched in the N protection finishes at last, and the system resource of ONU 1103-1 is used by ONU 2 103-2 and ONU 3 103-3.In addition, if ONU 2 103-2 and ONU 3 103-3 do not receive and the assignment messages of Port-ID 1 and Port-ID 256 then come back to step 602 in step 603.
Figure 18 is that the present invention realizes message that adjacent ONU protection is switched and an example of data conveying flow.Suppose that link failure takes place ONU 1 103-1, ONU 2 103-2 switch ONU as protection.At first be that the control module 211 of OLT 101 and the control module 307 of ONU 103 obtain initialization respectively; namely; the information in above-mentioned each table that makes all keeps up-to-date state, and makes ONU protection switch that table 211 is consistent with information in 314, PON system resource allocation table 212 is also consistent with the fresh information in 315.
The state information of fault detection module 306-1 monitoring ONU 1 103-1 of ONU 1 103-1; when link failure takes place in ONU 1 103-1; fault detection module 306-1 switches protection ONU ID 214 in the table 314 according to the protection of above-mentioned ONU 1 103-1; by by the specified adjacent ONU of protection ONU ID 214; send the fault message of above-mentioned ONU 1 103-1 the fault detect controller of OLT 101 to, a plurality of protection ONU ID215 of switching in the table 211 according to above-mentioned protection of OLT 101 select to protect link then.If ONU 2 103-2 provide enough resource protections to switch can for ONU 1 103-1, then link is switched in the ONU 2 103-2 protection that is set to ONU 1 103-1.Then, the system resource of 206 couples of ONU 1 103-1 of the control module of OLT 101 is distributed.Specifically, the Port-ID 1 of ONU 1 103-1 is assigned to ONU 2 103-2, and the Port-ID filter 302-2 of ONU 2 103-2 is correspondingly upgraded; Simultaneously, the upstream bandwidth W1 of ONU 1 103-1 is assigned to ONU 2 103-2, and the data processing module 303-2 of ONU 2 103-2 is correspondingly upgraded.Then, upgrade the spare interface 305-2 of ONU 2 103-2, upgrade the active/standby interface 304-1/305-1 that uses of ONU 1 103-1.At last, whole communications of ONU 1 103-1 recover fully by the protection link of ONU 2103-2.
As shown in figure 18; the communication of ONU 1 103-1 is by behind the protection link-recovery of ONU 2 103-2; upstream data _ 1 of ONU 1 103-1 sends to spare interface 305-1 by the main interface 304-1 of ONU 1 103-1, and the spare interface 305-2 by ONU 2 103-2 is sent to ONU 2103-2 then.Upstream data _ 2 of upstream data _ 1 of ONU 1 103-1 and ONU 2 103-2 are re-used in the data processing module 303-2 of ONU 2103-2, and transmit in the PON system.
Downlink data for ONU 1 103-1, when downlink data _ when all arriving ONU 2 103-2, the Port-ID filter 302-2 of ONU 2103-2 is the downlink data that 1 and 2 data reception belongs to ONU 1 103-1 and ONU 2 103-2 by filtering Port-ID value, and with reference to the U/D MAC 217 corresponding with above-mentioned Port-ID value in the above-mentioned PON system resource allocation table 315, downlink data _ 1 of ONU 1 103-1 is sent to above-mentioned U/D MAC 217 corresponding ONU 1 103-1 by spare interface 305-2 and 305-1.
Figure 19 is GPON system transmissions convergence-level (GTC:GPON Transmission Convergence) downlink data frame structure and upstream bandwidth distribution diagram.G.984.3, ITU-T has stipulated that GTC downlink data frame structure and upstream bandwidth distribute.The GTC downlink data frame is the fixed length frame format of 125us, is made up of downlink physical controll block (PCBd) 701 and pay(useful) load 702.PCBd 701 comprises: the physical layer synchronization territory (PSync) 703 of 4 bytes, for the original position of determining downlink data frame; The Ident territory 704 of 4 bytes is used for the big data frame structure of sign; The descending PLOAMd of 13 bytes (Operation Administration and Maintenance of physical layer) 705; The descending pay(useful) load length 707 and 708 of the bit interleaved parity of 1 byte (BIP) 706,4 bytes; And the upstream bandwidth distribution diagram of N*8 byte.
Wherein, PLOAMd 705 comprises: the ONU ID 710 of 1 byte is used for distinguishing ONU; The message id 711 of 1 byte is used for distinguishing the different messages type; The data field 712 of 10 bytes is used for the load of GTC message; And the Cyclic Redundancy Check 713 of 1 byte, be used for frame check.
For upstream bandwidth distribution diagram 709 parts, N determines that by the ONU quantity of concrete access the allocated bandwidth of each access 714 comprises 8 bytes.Comprising 12 bit A lloc-ID, 715,12 bit labelings (Flags), 717, the 2 byte concluding times of 2 byte initial time stamp are stabbed 718 and 1 byte CRC713.
Figure 20 is the message structure figure that distributes Alloc-ID.This message belongs to PLOAMd705, and the length of message is 13 bytes.This message comprises ONU ID, message id 711, data field 712 and CRC713.Wherein, message id 711 is the Alloc-ID type field 720 of the data field 712 of 00001010,10 byte complete 0,8 bits of Alloc-ID, 4 bits that comprise 12 bits and the reservation territory of 7 bytes.
Figure 21 is the message structure figure that distributes Port-ID.This message belongs to PLOAMd705 equally, and the length of message is 13 bytes.This message comprises ONU ID, message id 711, data field 712 and CRC713.Wherein, message id 711 is the reservation territory that the data field 712 of 00001110,10 byte comprises complete 0, the 12 bit Port-ID 721 of 7 bits, complete 0 and 7 byte of 4 bits.
Realize the method and apparatus that protection is switched according to adjacent ONU in the PON of the present invention system; when breaking down; adjacent ONU connects and can realize giving mutual protection at user side interface by wired or wireless mode; can also realize the reasonable utilization of PON system resource by the distribution of carrying out system resources such as LLID, bandwidth again; provide effective PON system protection to switch, and can take full advantage of PON system resource.In addition, the present invention does not need to carry out the redundant link construction, has good and economic.
Claims (11)
1. entrant's end device is connected with the local side device by optical branching device, and communicates with above-mentioned local side device, it is characterized in that,
Possess communication unit, this communication unit is used for communicating with a plurality of other the entrant's end devices that are connected on the common above-mentioned optical branching device,
From above-mentioned local side device and passed through under the situation that light signal that above-mentioned optical branching device sends to entrant's end device can not arrive, entrant's end device that above-mentioned light signal can not arrive is by above-mentioned communication unit, a plurality of entrant's end devices beyond this entrant's end device receive above-mentioned light signal
Also have detecting unit and control unit,
Above-mentioned detecting unit is for detection of the current Link State of entrant's end device,
Store protection in the above-mentioned control unit and switch table, described protection is switched to store in the table to protect and is switched entrant's end device identifier,
Detecting at above-mentioned detecting unit that above-mentioned light signal can not arrive is under the situation of link failure; above-mentioned control unit is switched entrant's end device identifier according to above-mentioned protection; send fault-signal by other entrant's end device of being switched the appointment of entrant's end device identifier by protection to above-mentioned local side device
Store the system resource allocation table in the above-mentioned control unit, store a plurality of link informations in the described system resource allocation table, each link information comprises port identifiers and MAC Address,
Above-mentioned entrant's end device also has the ports filter unit,
Above-mentioned control unit is according to the port identifiers in the said system resource allocation table, utilize the filtration of above-mentioned ports filter unit and reception from the light signal of above-mentioned local side device, then respectively with reference to the MAC Address corresponding with above-mentioned port identifiers, above-mentioned filtered data is sent to the corresponding entrant's end device of above-mentioned MAC Address
Also store distribution marker, dynamic bandwidth allocation value and main broadband value in the said system resource allocation table, wherein above-mentioned distribution marker is corresponding one by one with above-mentioned dynamic bandwidth allocation value.
2. entrant's end device as claimed in claim 1 is characterized in that,
Include above-mentioned link information and bandwidth allocation information in the light signal from the local side device, described bandwidth allocation information comprises distribution marker and dynamic bandwidth allocation value,
Above-mentioned control unit upgrades information in the said system resource allocation table according to above-mentioned link information and above-mentioned bandwidth allocation information.
3. entrant's end device as claimed in claim 1 or 2 is characterized in that,
Above-mentioned communication unit comprises main interface and spare interface,
At the current link of entrant's end device just often, be connected with client and communicate by letter by above-mentioned main interface,
When the current link failure of entrant's end device, communicate by above-mentioned spare interface and above-mentioned main interface and other entrant's end device.
4. entrant's end device as claimed in claim 1 or 2 is characterized in that,
Also have data processing unit, this data processing unit provides the function of the transmission convergence layer in the optical-fiber network.
5. entrant's end device as claimed in claim 1 or 2 is characterized in that,
Also have the optical distribution network interface, this optical distribution network interface is provided at the data transformation function when carrying out transfer of data in the optical distribution network.
6. a local side device is connected with a plurality of entrant's end devices by common optical branching device, and communicates with above-mentioned a plurality of entrant's end devices, it is characterized in that,
Possess detecting unit, this detecting unit detects a part of entrant's end device that whether exists above-mentioned light signal to arrive,
Detect under the situation that light signal that a part of entrant's end device in above-mentioned a plurality of entrant's end devices sends can not arrive at above-mentioned detecting unit, by other a plurality of entrant's end devices beyond this part entrant end device, send above-mentioned light signal to above-mentioned a part of entrant's end device
Also possess control unit,
Store protection in this control unit and switch table, entrant's end device identifier of storing above-mentioned a plurality of entrant's end devices in the table is switched in described protection and entrant's end device identifier is switched in a plurality of protections corresponding with each entrant's end device identifier,
Detecting at above-mentioned detecting unit that above-mentioned light signal can not arrive is under the situation of link failure; entrant's end device identifier is switched in the protection that above-mentioned control unit is switched table with reference to above-mentioned protection; select a plurality of protections corresponding with entrant's end device that link failure takes place to switch entrant's end device; and switch entrant's end device by selected a plurality of protections and send above-mentioned light signal to entrant's end device of above-mentioned generation link failure
Also store the system resource allocation table in this control unit,
Store a plurality of entrant's end device identifiers in the described system resource allocation table, and respectively with each entrant's end device identifier corresponding port identifier, distribution marker, MAC Address, dynamically bandwidth allocation value and main broadband value, wherein above-mentioned distribution marker is corresponding one by one with a plurality of dynamic bandwidth allocation values
Above-mentioned control unit switches entrant's end device for above-mentioned a plurality of protections link and allocated bandwidth that entrant's end device of link failure takes place according to the symbol of the port identification in the system resource allocation table and dynamic bandwidth allocation value.
7. local side device as claimed in claim 6 is characterized in that,
After the link of entrant's end device that link failure will take place and allocated bandwidth switch entrant's end device for above-mentioned a plurality of protections, switch the relevant information of entrant's end device with above-mentioned a plurality of protections in the above-mentioned control unit update system resource allocation table,
Above-mentioned control unit is switched entrant's end device to above-mentioned a plurality of protections and is sent above-mentioned light signal; comprise data, link information and bandwidth allocation information that entrant's end device of above-mentioned generation link failure is asked in the described light signal; described link information comprises port identifiers and MAC Address, and described bandwidth allocation information comprises distribution marker and dynamic bandwidth allocation value.
8. as claim 6 or 7 described local side devices, it is characterized in that,
Also have business interface, this business interface provides business interface in the optical-fiber network zone and the conversion of transmission convergence layer frame interface.
9. as claim 6 or 7 described local side devices, it is characterized in that,
Also have data processing unit, this data processing unit provides the function of the transmission convergence layer in the optical-fiber network.
10. as claim 6 or 7 described local side devices, it is characterized in that,
Also have the optical distribution network interface, this optical distribution network interface is provided at the data transformation function when carrying out transfer of data in the optical distribution network.
11. a passive optical network comprises a plurality of entrant's end devices, optical branching device drawn game end device, above-mentioned a plurality of entrant's end devices are connected with above-mentioned local side device by above-mentioned optical branching device, and communicate with above-mentioned local side device, it is characterized in that,
Above-mentioned a plurality of entrant's end device is the entrant's end device described in claim 1～5,
Above-mentioned local side device is the local side device described in claim 6～10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910171384 CN102006525B (en) | 2009-08-31 | 2009-08-31 | Optical communication control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910171384 CN102006525B (en) | 2009-08-31 | 2009-08-31 | Optical communication control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102006525A CN102006525A (en) | 2011-04-06 |
| CN102006525B true CN102006525B (en) | 2013-08-14 |
Family
ID=43813529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910171384 Expired - Fee Related CN102006525B (en) | 2009-08-31 | 2009-08-31 | Optical communication control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102006525B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316392A (en) * | 2011-09-22 | 2012-01-11 | 中兴通讯股份有限公司 | Method for realizing optical network unit (ONU) redundancy protection in fiber to the home (FTTH) network, apparatus and system thereof |
| CN102598587A (en) * | 2011-11-03 | 2012-07-18 | 华为技术有限公司 | Method for protecting communication and devices for the same |
| CN104009792A (en) * | 2013-02-25 | 2014-08-27 | 中兴通讯股份有限公司 | Passive optical network communication failure reporting method and system thereof |
-
2009
- 2009-08-31 CN CN 200910171384 patent/CN102006525B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102006525A (en) | 2011-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102917286B (en) | Hand-in-hand protection switching method and system in EPON (Ethernet Passive Optical Network) | |
| US8755685B2 (en) | Joint switching method for an aggregation node, aggregation node and system | |
| JP6367246B2 (en) | Communication network | |
| US8315527B2 (en) | Passive optical network system and optical line terminal | |
| CN102132529B (en) | PON system and redundancy method | |
| CN1859811B (en) | Passive optical network system and its service protective method | |
| US7567564B2 (en) | Optical access network apparatus and data signal sending method therefor | |
| CN102369737B (en) | Data communication method of optical network system, optical network units and system | |
| US9106332B2 (en) | Data synchronization method and system, and optical network unit | |
| JP2004096734A (en) | Apparatus and method for duplexing gigabit ethernet (r) passive optical network system, and frame format for controlling the same | |
| CN102130718B (en) | A kind of network element device of protection switching of backbone optical path and method | |
| CN101350679A (en) | Protection switching method, system and equipment based on Ethernet passive optical network | |
| CN101489155B (en) | Passive optical network system and service protection method thereof | |
| US7512337B2 (en) | Gigabit ethernet passive optical network having double link structure | |
| CN104025511A (en) | Service protection method, optical line terminal and system in passive optical network | |
| CN102340392B (en) | Method and system for improving reliability of service in passive optical network system | |
| CN103380599A (en) | Communication system, method of switching communication link and master station device | |
| CN102594444B (en) | A kind of method and system realizing full protection modes | |
| US8422881B2 (en) | Optical access network | |
| CN101600128B (en) | ONU and method for achieving all-fiber protection switching | |
| CN102006525B (en) | Optical communication control device | |
| US20150063811A1 (en) | Central-office termination apparatus of adaptively changing connection to subscriber-terminal terminator and path switching method | |
| CN102291270A (en) | Management method and system of optical network units in passive optical network | |
| CN102487466B (en) | The method and system of the transmission data under a kind of full guard pattern in EPON | |
| CN102740171B (en) | A kind of EPON loop detecting method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20140831 |
|
| EXPY | Termination of patent right or utility model |