CN101150361A - A method and system for realizing fully protective switching in passive optical network - Google Patents
A method and system for realizing fully protective switching in passive optical network Download PDFInfo
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Abstract
This invention discloses a method and a system for realizing conversion of total protection in a passive light network, in which, the method includes: setting a light shunt and connecting it with a first optical module in an optical network unit (ONU) via a master route and connecting the shunt with a second optical module in the ONU via a standby route and connecting it with an optical line terminal (OLT), which transmits switch information of optical interfaces to the ONU by the shunt to switch the second optical module to a master module and transmit and receive data by it. In this invention, only one OLT is necessary at the end and only one optical module is needed in the OLT.
Description
Technical field
The present invention relates to the optical-fiber network technology, particularly relate to a kind of method and system of in EPON (PON), realizing fully protective switching.
Background technology
The PON technology is the light access technology that a kind of point-to-multipoint transmits.Fig. 1 is the schematic diagram of PON system.Referring to Fig. 1, the PON system mainly comprises: optical line terminal (OLT), light distributed network (ODN) and optical network unit (ONU).Wherein, OLT connects one or more ODN; ODN is the passive optical splitters part, and the data that OLT is descending are transferred to each ONU along separate routes by light; And with the upstream data of ONU by aggregate transmission to OLT.
The PON system can provide at a high speed and cheap network insertion service for the user, has broad application prospects.Like this, the survivability of guaranteeing the PON system then becomes an important problem.In order to guarantee the survivability of PON system, guarantee that when equipment component or link failure the PON system still can operate as normal, must realize in the PON system that then protection switches.At present, when realizing that in the PON system protection is switched, comprise that mainly the main line protection switches and fully protective switching.Wherein, fully protective switching not only comprises to be switched the protection on main line, but also comprises the protection of branch road is switched, and the general protection to the PON system can be provided.
Fig. 2 is first kind of system configuration schematic diagram when realizing fully protective switching in the prior art in the PON system.Referring to Fig. 2; in the prior art; in order in the PON system, to realize fully protective switching; a kind of implementation is: two optical modules are set in OLT; use optical module and standby optical module as the master respectively by these two optical modules; and, in ONU, also comprise two as main different optical modules with optical module and standby optical module.At primary path just often, communicate with optical module with the master among optical module and the ONU, when the primary path fault, communicate by standby optical module among the OLT and the standby optical module among the ONU by the master among the OLT.
Fig. 3 is second kind of system configuration schematic diagram when realizing fully protective switching in the prior art in the PON system.Referring to Fig. 3, in the prior art, in order to realize fully protective switching in the PON system, another kind of implementation is: at local side (CO) at least two OLT are set, comprise two as main different optical modules with optical module and standby optical module in ONU.At primary path just often, communicate with optical module with the master among OLT and the ONU, when the primary path fault, communicate by the standby optical module among another spare OLT and the ONU by a master.
By above description as can be seen, in the prior art, in order in the PON system, to realize fully protective switching; must two optical modules be set in an OLT or a plurality of OLT are set; thereby increased the cost of system, increased professional realization difficulty, greatly reduced QoS.
Summary of the invention
In view of this; first purpose of the present invention is to provide a kind of method that realizes fully protective switching in the PON system; second purpose of the present invention is to provide a kind of system that realizes fully protective switching in the PON system, when realizing the fully protective switching of PON system, reduces the cost of system.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of method that in EPON, realizes fully protective switching; optical branching device is set; optical branching device is linked to each other with first optical module in the optical network unit ONU by primary path; and optical branching device linked to each other with second optical module in the optical network unit ONU by backup path; and optical branching device linked to each other with optical line terminal OLT, this method also comprises:
A, OLT are sent to ONU by optical branching device with light mouth handover information;
After B, ONU receive light mouth handover information, second optical module is switched to the master use optical module, by the second optical module transceive data.
Before steps A, further comprise: whether OLT monitoring primary path breaks down, and after determining primary path goes wrong, carries out described steps A.
This method further comprises: at primary path just often, first optical module is sent to optical branching device with normal notification message by primary path; Optical branching device is sent to described OLT with normal notification message;
The step whether described OLT monitoring primary path breaks down comprises: whether described OLT monitoring receives normal notification message in setting-up time length, if do not receive, then determines primary path goes wrong.
Before steps A, further comprise: whether OLT monitors to satisfy and forces switching condition, after determining to satisfy the pressure switching condition, carries out described steps A.
In step B, after ONU received light mouth handover information, ONU postponed the time span of setting, carried out the described step of leading with optical module that second optical module is switched to then.
Further comprised before steps A: OLT is sent to optical branching device with downlink data; Optical branching device is sent to downlink data first optical module and second optical module among the ONU respectively by primary path and backup path; ONU carries out Business Processing according to the downlink data that receives on first optical module.
Carry the sign of selecting for use of the first light mouth in the described downlink data.
Further comprised before steps A: ONU is sent to optical branching device by the upstream data that first optical module and primary path will carry first light mouth sign; Optical branching device is sent to OLT with the upstream data that receives.
Further comprised before steps A: OLT is carried at first light mouth sign and is sent to optical branching device in the Frame; Optical branching device is sent to first optical module and second optical module among the ONU by primary path and backup path respectively with the Frame that receives; ONU is according to the first light mouth sign of carrying in the Frame, by the first optical module transceive data.
This method further comprises: ONU determines that first optical module and second optical module receive the time difference of described same Frame, determined time difference is sent to OLT by first optical module, primary path and optical branching device, OLT determines the distance measurement value of backup path according to the time difference that receives and the distance measurement value of primary path.
Described steps A further comprises: the distance measurement value of the current use of OLT is set to the distance measurement value of backup path.
Described determined time difference is comprised by the step that first optical module, primary path and optical branching device are sent to OLT: ONU is carried at determined time difference in the range finding difference notification message, is sent to OLT by first optical module, primary path and optical branching device.
This method is applied among the Ethernet passive optical network EPON.
In steps A, described OLT comprises the step that light mouth handover information is sent to ONU: the GATE frame that OLT will carry second light mouth sign is sent to ONU;
In step B, receive the GATE frame that carries second light mouth sign at ONU after, ONU postpones the time span set, and is discarded in the GATE frame that receives in this setting-up time length, carries out then described second optical module to be switched to main step with optical module.
The step that described sign is carried in the described frame comprises: described sign is carried in the reserved field of lead code of described frame.
A kind of system that in EPON, realizes fully protective switching; this system comprises: have OLT, optical branching device, at least two ODN of an optical module and have the ONU of at least two optical modules; wherein; OLT links to each other with first optical module among the ONU by the ODN on optical branching device and the primary path; OLT also links to each other with second optical module among the ONU by the 2nd ODN on optical branching device and the backup path
OLT is used for light mouth handover information is sent to optical branching device;
Optical branching device, the light mouth handover information that is used for receiving sends to first optical module and second optical module of ONU respectively by ODN on the primary path and the 2nd ODN on the backup path;
ONU, in self, receive light mouth handover information on any one optical module after, second optical module switched to main uses optical module, by the second optical module transceive data.
The GATE frame that described OLT will carry second light mouth sign is sent to optical branching device as light mouth handover information;
Described optical branching device sends to first optical module and second optical module among the ONU with the GATE frame that carries second light mouth sign respectively by ODN on the primary path and the 2nd ODN on the backup path;
Described ONU obtains described second light mouth sign from the GATE frame that described any one optical module receives.
Also comprise among the described ONU: module is switched in protection;
Described OLT, be used for active and standby with the path just often, the Frame that carries first light mouth sign is sent to optical branching device, after receiving time difference, determine the distance measurement value of backup path according to the distance measurement value of this time difference and primary path, when sending light mouth handover information, the distance measurement value of current use is set to the distance measurement value of backup path;
Optical branching device, the Frame that carries first light mouth sign that is used for receiving is sent to an ODN and the 2nd ODN; The one ODN and the 2nd ODN, the Frame that carries first light mouth sign that will receive respectively is sent to first optical module and second optical module among the ONU;
Module is switched in protection, is used for determining that same Frame arrives the time difference of first optical module and second optical module, and determined time difference is sent to OLT by first optical module, an ODN and optical branching device.
Also comprise business module among the described ONU;
Described OLT, the upstream data transmitting time that will determine according to the distance measurement value of backup path and second light mouth sign are carried in the GATE frame and are sent to optical branching device;
Optical branching device sends to first optical module and second optical module among the ONU with the GATE frame that carries the upstream data transmitting time and second light mouth sign respectively by ODN on the primary path and the 2nd ODN on the backup path;
Module is switched in protection; monitor after described any one optical module receives the GATE frame that carries upstream data transmitting time and second light mouth sign; second optical module is switched to the main optical module of using; the upstream data of business module being sent according to the upstream data transmitting time in the GATE frame sends by second optical module, and the data that second optical module is received are sent to business module.
This shows that the present invention has the following advantages:
When 1, the present invention realizes fully protective switching in the PON system, an OLT only need be set, and only need have an optical module in this OLT at local side; and, therefore, reduced the cost of system by optical branching device realization beam split; reduce professional realization difficulty, improved QoS greatly.
2; in the present invention; at primary path just often; ONU can be sent to OLT with the range finding difference of primary path and backup path; OLT obtains the distance measurement value of backup path according to this range finding difference; like this; protect when switching in the primary path fault; OLT can directly carry out data according to the standby optical module among the distance measurement value indication ONU of the backup path that has obtained and send; and need not the process that the standby optical module among the ONU re-registers; therefore; reduced the time that protection is switched greatly, the real-time that protection is switched is good, has satisfied the carrier-class protection and has switched requirement.
3, in the present invention; OLT protects when switching at indication ONU; only needing to carry in issuing frame the light mouth sign that should switch to gets final product; such as; carry the light mouth sign that should switch in the lead code in issuing frame, therefore, it is simple that controlling mechanism is switched in protection; have good real-time and operability, strengthened using value of the present invention greatly.
Description of drawings
Fig. 1 is the schematic diagram of PON system.
Fig. 2 is first kind of system configuration schematic diagram when realizing fully protective switching in the prior art in the PON system.
Fig. 3 is second kind of system configuration schematic diagram when realizing fully protective switching in the prior art in the PON system.
Fig. 4 is the basic structure schematic diagram of system of the present invention.
Fig. 5 is the internal structure schematic diagram of ONU in the present invention.
Fig. 6 is the concrete structure schematic diagram of system of the present invention.
Fig. 7 is in embodiments of the present invention at primary path business processing flow figure just often.
Fig. 8 is the business processing flow figure when the primary path fault in embodiments of the present invention.
Embodiment
The present invention proposes a kind of method that in the PON system, realizes fully protective switching, its core concept is: optical branching device is set, optical branching device is linked to each other with first optical module among the ONU by primary path, and optical branching device linked to each other with second optical module among the ONU by backup path, and optical branching device is linked to each other with OLT; OLT is sent to ONU by optical branching device with light mouth handover information; After ONU receives light mouth handover information, second optical module is switched to the master use optical module, by the second optical module transceive data.
Preferably, the present invention with the implementation that light mouth handover information is sent to ONU can be: second light mouth sign is carried at is sent to ONU in the downlink frame.
Accordingly, the invention allows for a kind of system that in the PON system, realizes fully protective switching.Fig. 4 is the structural representation of system of the present invention.Referring to Fig. 4, system of the present invention comprises: have OLT, optical branching device, at least two ODN of an optical module and have the ONU of at least two optical modules, wherein, OLT links to each other with optical module 1 among the ONU by the ODN1 on optical branching device and the primary path, OLT also links to each other with optical module 2 among the ONU by the ODN2 on optical branching device and the backup path, and optical module 1 links to each other with work light mouth PON1 mouth among the ONU, and optical module 2 links to each other with standby light mouth PON2 mouth among the ONU, and
OLT is used for light mouth handover information is sent to optical branching device;
Optical branching device, the light mouth handover information that is used for receiving sends to optical module 1 and the optical module 2 of ONU respectively by ODN1 on the primary path and the ODN2 on the backup path;
ONU, in self, receive light mouth handover information on any one optical module after, optical module 2 switched to main uses optical module, by optical module 2 transceive data.
Fig. 5 is the internal structure schematic diagram that has the ONU of protection switch function in the present invention.Referring to Fig. 4 and Fig. 5, in the present invention, the internal structure with ONU of protection switch function comprises: module and business module are switched at least two optical modules, protections.Like this, the concrete structure of system of the present invention can be referring to shown in Figure 6.
Technical scheme of the present invention can be applied to the fully protective switching of various PON system, such as Ethernet passive optical network (EPON) and APON etc.
Need to prove, in the present invention, can be when OLT monitors the primary path fault, and the execute protection reversed process also can be to monitor when satisfy forcing switching condition the execute protection reversed process at OLT.Wherein, described OLT monitors and satisfy to force switching condition to be: OLT receives the switching command of administrative staff's input, or OLT to monitor the transmission environment of primary path relatively poor or the like.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and the specific embodiments.
In following embodiment, being applied to the EPON system with technical solution of the present invention is that example describes.
Fig. 7 is in embodiments of the present invention at primary path business processing flow figure just often.Referring to Fig. 6 and Fig. 7, utilize system of the present invention, when primary path just often, the Business Processing process of the inventive method in the EPON system may further comprise the steps:
Step 701: when the ONU with protection switch function registered, the optical module 1 of this ONU inside and optical module 2 received the frame of windowing that OLT sends respectively.
Here, the optical module 1 of ONU inside and optical module 2 are connected PON1 mouth and the PON2 mouth of ONU respectively, are that the PON1 mouth is an example with the work light mouth of ONU initial default, and then the work optical module in the inner initial default of ONU is an optical module 1.
Step 702:ONU determines the main optical module of using.
Here, can normally receive the frame of windowing if the work optical module of initial default is an optical module 1, so, in this step, ONU is defined as the main optical module of using with optical module 1; If optical module 1 can not normally receive the frame of windowing, and optical module 2 can normally receive the frame of windowing, so, in this step, ONU is defined as the main optical module of using with optical module 2.In following flow process, be that optical module 1 is that example describes with optical module with determined master.
Step 703: the PON1 mouth sign that the optical module 1 of main usefulness connects is carried in the registration request frame and is sent to OLT by ODN1 on the primary path and optical branching device.
Here, OLT can determine then that according to the sign of the PON1 mouth in the received registration request frame master among the ONU is an optical module 1 with optical module, and standby optical module is an optical module 2.
By the process of above-mentioned steps 701 to step 703, the OLT that has then finished ONU with at least two optical modules and only had an optical module consults the process of active and standby optical module and corresponding PON mouth among the ONU.
Step 704:OLT obtains the distance measurement value PON1-RANGE of primary path according to the registration request frame that receives.
Here, because what carry in the registration request frame is PON1 mouth sign, OLT then can determine the distance measurement value of the primary path of optical module 1 this distance measurement value correspondence is from self to ONU, is designated as PON1-RANGE.
Step 705: just often at primary path, OLT determines the transmitting time of upstream data at optical module 1 according to the distance measurement value PON1-RANGE of current primary path, PON1 mouth sign and determined upstream data is carried in the GATE frame at the transmission time information of optical module 1 is sent to optical branching device.
Step 706: after optical branching device receives this GATE frame, this GATE frame is sent to ODN1 and ODN2 on primary path and the backup path respectively, ODN1 and ODN2 are sent to the GATE frame that receives optical module 1 and the optical module 2 among the ONU respectively.
Protection among the step 707:ONU is switched module and is determined that current GATE frame arrives the time difference of optical module 1 and optical module 2.
Here; can switch in protection in advance a timer is set in the module; like this; the specific implementation process of this step can be: when protection is switched module monitors in optical module 1 and optical module 2 when at first receiving the GATE frame; then start timer, like this, when protection is switched module monitors another in optical module 1 and optical module 2 and is received the GATE frame; then can obtain the currency of timer, with the currency of the timer that obtained as the time difference described in this step.
Step 708: protection is switched module determined time difference is carried in the OAM frame, this OAM frame is sent to the optical module 1 of main usefulness.
Here, time difference is carried in the OAM frame, then this OAM frame then can be used as range finding difference notification message.
Step 709: optical module 1 is sent to ODN1 with the OAM frame that receives, and ODN1 is sent to optical branching device with the OAM frame that receives again, and this optical branching device is sent to OLT with the OAM frame that receives.
In above-mentioned steps 708 and step 709, can also in described OAM frame, carry PON1 mouth sign.
Step 710:OLT obtains the distance measurement value PON2-RANGE of backup path according to the distance measurement value PON1-RANGE of time difference in the OAM frame that receives and the primary path preserved in self.
Need to prove, above-mentioned steps 705 to step 710 is processes of one-period execution, that is to say, periodically mutual GATE frame of OLT and ONU and OAM frame, OLT is according to the range finding difference in the OAM frame that receives, the distance measurement value PON2-RANGE of the backup path of preserving in the real-time update self at every turn.In addition, the REPORT frame that OLT can also periodically report according to ONU, the distance measurement value PON1-RANGE of the primary path of preserving in the real-time update self.
In addition; in above-mentioned steps 707; when after receiving the GATE frame on the optical module 1; module is switched in protection can also be according to the transmission time information of the upstream data that carries in the GATE frame at optical module 1; in the upstream data that business module is sent, carry the sign of the PON1 mouth that optical module 1 connected in time corresponding; the upstream data that then this is carried PON1 mouth sign is sent to ODN1 by optical module 1; the upstream data that ODN1 will carry PON1 mouth sign is sent to optical branching device; the upstream data that optical branching device will carry PON1 mouth sign is sent to the optical module among the OLT, thereby finishes the transmitting uplink data process.
Step 711: at primary path just often, the downlink data that the optical module of OLT by inside will carry PON1 mouth sign is sent to optical branching device.
Step 712: optical branching device is sent to ODN1 and ODN2 with this downlink data respectively, and ODN1 is sent to the downlink data that receives optical module 1 that is connected the PON1 mouth among the ONU and the optical module 2 that is connected the PON2 mouth respectively with ODN2.
Step 713: it is that the downlink data that optical module 1 receives is sent to the processing that business module carries out correspondence with current master with optical module that module is switched in protection.
Here, protection is switched module can further to abandon current spare module is the downlink data that optical module 2 receives.
Need to prove, above-mentioned steps 705 to step 710 and step 711 to the sequencing that there is no between the step 713 in the fixing execution.
Also need to prove, in above-mentioned process shown in Figure 7, also can utilize other Frames to substitute the GATE frame, and, also can utilize other range finding difference notification message to substitute the OAM frame.
Fig. 8 is the business processing flow figure when the primary path fault in embodiments of the present invention.Referring to Fig. 6, Fig. 7 and Fig. 8, utilize system of the present invention, when the primary path fault, the Business Processing process of the inventive method in the EPON system may further comprise the steps:
Whether step 801:OLT monitoring primary path breaks down, after determining to break down, the distance measurement value of the current use of OLT is set to the distance measurement value of backup path, determine the transmitting time of upstream data according to the distance measurement value of the current backup path of preserving in self at optical module 2, determined upstream data is carried in the GATE frame of being constructed at the transmission time information of optical module 2 and the sign of standby light mouth PON2 mouth, then this GATE frame is sent to optical branching device.
Here, the specific implementation process whether OLT monitoring primary path breaks down can be: at primary path just often, optical module 1 periodically will carry the normal notification message of PON1 mouth sign, such as the REPORT frame, be sent to optical branching device by the ODN1 on the primary path; The REPORT frame that optical branching device will carry PON1 mouth sign is sent to OLT, after OLT periodically receives the REPORT frame that carries PON1 mouth sign, can determine that then primary path is normal, and when the time span a setting, in one or more cycles, OLT does not receive the REPORT frame that carries PON1 mouth sign, then determines primary path goes wrong.Wherein, described normal notification message also can not carry described PON1 mouth sign such as in the REPORT frame.
In addition, in this step, whether OLT also can monitor to satisfy and force switching condition, monitoring when satisfy forcing switching condition, carrying out described upstream data is carried at the process that is sent to optical branching device in the GATE frame of being constructed at the transmission time information of optical module 2 and the sign of PON2 mouth.
Step 802: optical branching device will carry upstream data and be sent to ODN2 at the transmission time information of optical module 2 and the GATE frame of PON2 mouth sign.
Step 803:ODN2 is sent to optical module 2 among the ONU with this GATE frame.
Step 804: optical module 2 is sent to protection with the current GATE frame that receives and switches module.
Step 805: protection is switched module according to the sign of the PON2 mouth in the current GATE frame that receives, and determines to answer execute protection to switch processing, optical module 2 is switched to current master use optical module, by optical module 2 transceive data.
In this step; switch module when receiving the GATE frame that carries PON2 mouth sign when protection, might have upstream data to send, like this by the optical module 1 of former main usefulness; if protection is switched module and is carried out described handoff procedure immediately; then can cause losing of these data, therefore, for fear of this shortcoming; in this step; after determining to answer execute protection to switch processing, module is switched in protection can carry out the switching that is reached again after the time span Td of a setting of time-delay.
In addition; because after detecting the primary path fault; the OLT side can periodically send the GATE frame that carries PON2 mouth sign; like this; if in this step; carry out described switching after the time span Td of delay adjustments again; so; protection is switched module after receiving the GATE frame that carries PON2 mouth sign; directly abandoning this GATE frame gets final product; and need not to obtain according to this GATE frame again the transmitting time of upstream data, thus to avoid not carrying out before the PON mouth switches, upstream data sends from the PON1 mouth of the link that breaks down.
In this step, protection is switched module according to the transmission time information of the upstream data that carries in the current GATE of the receiving frame at optical module 2, sends upstream data in time corresponding by optical module 2.
Need to prove; in above-mentioned each flow process; carrying PON mouth label manner in each frame can be: the sign of the PON mouth of correspondence is carried in the reserved field of lead code of described frame; such as; at primary path just often; ONU carries PON1 mouth sign in the reserved field of the lead code of upgoing O AM frame that sends and uplink data frames; OLT carries PON1 mouth sign in the reserved field of the lead code of descending GATE frame that sends and downlink data frame; for another example; the primary path fault protect switch after; ONU carries PON2 mouth sign in the reserved field of the lead code of upgoing O AM frame that sends and uplink data frames, OLT carries PON2 mouth sign in the reserved field of the lead code of descending GATE frame that sends and downlink data frame.
In the above-described embodiments, be that to be applied to the EPON system with technical solution of the present invention be example.When technical solution of the present invention is applied to other PON systems; during such as the APON system; the principle that realizes the process of fully protective switching and the described process of the foregoing description is identical, just the GATE frame in the foregoing description and OAM frame need be replaced with the data message in other PON systems.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1. method that in EPON, realizes fully protective switching; it is characterized in that; optical branching device is set; optical branching device is linked to each other with first optical module in the optical network unit ONU by primary path; and optical branching device linked to each other with second optical module in the optical network unit ONU by backup path; and optical branching device linked to each other with optical line terminal OLT, this method also comprises:
A, OLT are sent to ONU by optical branching device with light mouth handover information;
After B, ONU receive light mouth handover information, second optical module is switched to the master use optical module, by the second optical module transceive data.
2. method according to claim 1 is characterized in that, before steps A, further comprises: whether OLT monitoring primary path breaks down, and after determining primary path goes wrong, carries out described steps A.
3. method according to claim 2 is characterized in that, this method further comprises: at primary path just often, first optical module is sent to optical branching device with normal notification message by primary path; Optical branching device is sent to described OLT with normal notification message;
The step whether described OLT monitoring primary path breaks down comprises: whether described OLT monitoring receives normal notification message in setting-up time length, if do not receive, then determines primary path goes wrong.
4. method according to claim 1 is characterized in that, before steps A, further comprises: whether OLT monitors to satisfy and forces switching condition, after determining to satisfy the pressure switching condition, carries out described steps A.
5. method according to claim 1 is characterized in that, in step B, after ONU received light mouth handover information, ONU postponed the time span of setting, carries out the described step of leading with optical module that second optical module is switched to then.
6. method according to claim 1 is characterized in that further comprised: OLT is sent to optical branching device with downlink data before steps A; Optical branching device is sent to downlink data first optical module and second optical module among the ONU respectively by primary path and backup path; ONU carries out Business Processing according to the downlink data that receives on first optical module.
7. method according to claim 6 is characterized in that, carries the sign of selecting for use of the first light mouth in the described downlink data.
8. method according to claim 1 is characterized in that, further comprises before steps A: ONU is sent to optical branching device by the upstream data that first optical module and primary path will carry first light mouth sign; Optical branching device is sent to OLT with the upstream data that receives.
9. method according to claim 1 is characterized in that, further comprises before steps A: OLT is carried at first light mouth sign and is sent to optical branching device in the Frame; Optical branching device is sent to first optical module and second optical module among the ONU by primary path and backup path respectively with the Frame that receives; ONU is according to the first light mouth sign of carrying in the Frame, by the first optical module transceive data.
10. method according to claim 9, it is characterized in that, this method further comprises: ONU determines that first optical module and second optical module receive the time difference of described same Frame, determined time difference is sent to OLT by first optical module, primary path and optical branching device, OLT determines the distance measurement value of backup path according to the time difference that receives and the distance measurement value of primary path.
11. method according to claim 10 is characterized in that, described steps A further comprises: the distance measurement value of the current use of OLT is set to the distance measurement value of backup path.
12. method according to claim 10, it is characterized in that, described determined time difference is comprised by the step that first optical module, primary path and optical branching device are sent to OLT: ONU is carried at determined time difference in the range finding difference notification message, is sent to OLT by first optical module, primary path and optical branching device.
13., it is characterized in that this method is applied among the Ethernet passive optical network EPON according to any described method in the claim 1 to 12.
14. method according to claim 13 is characterized in that, in steps A, described OLT comprises the step that light mouth handover information is sent to ONU: the GATE frame that OLT will carry second light mouth sign is sent to ONU;
In step B, receive the GATE frame that carries second light mouth sign at ONU after, ONU postpones the time span set, and is discarded in the GATE frame that receives in this setting-up time length, carries out then described second optical module to be switched to main step with optical module.
15., it is characterized in that the step that described sign is carried in the described frame comprises: described sign is carried in the reserved field of lead code of described frame according to claim 7,8,9 or 12 described methods.
16. system that in EPON, realizes fully protective switching; it is characterized in that; this system comprises: have OLT, optical branching device, at least two ODN of an optical module and have the ONU of at least two optical modules; wherein; OLT links to each other with first optical module among the ONU by the ODN on optical branching device and the primary path; OLT also links to each other with second optical module among the ONU by the 2nd ODN on optical branching device and the backup path
OLT is used for light mouth handover information is sent to optical branching device;
Optical branching device, the light mouth handover information that is used for receiving sends to first optical module and second optical module of ONU respectively by ODN on the primary path and the 2nd ODN on the backup path;
ONU, in self, receive light mouth handover information on any one optical module after, second optical module switched to main uses optical module, by the second optical module transceive data.
17. system according to claim 16 is characterized in that, the GATE frame that described OLT will carry second light mouth sign is sent to optical branching device as light mouth handover information;
Described optical branching device sends to first optical module and second optical module among the ONU with the GATE frame that carries second light mouth sign respectively by ODN on the primary path and the 2nd ODN on the backup path;
Described ONU obtains described second light mouth sign from the GATE frame that described any one optical module receives.
18. system according to claim 17 is characterized in that, also comprises among the described ONU: module is switched in protection;
Described OLT, be used for active and standby with the path just often, the Frame that carries first light mouth sign is sent to optical branching device, after receiving time difference, determine the distance measurement value of backup path according to the distance measurement value of this time difference and primary path, when sending light mouth handover information, the distance measurement value of current use is set to the distance measurement value of backup path;
Optical branching device, the Frame that carries first light mouth sign that is used for receiving is sent to an ODN and the 2nd ODN; The one ODN and the 2nd ODN, the Frame that carries first light mouth sign that will receive respectively is sent to first optical module and second optical module among the ONU;
Module is switched in protection, is used for determining that same Frame arrives the time difference of first optical module and second optical module, and determined time difference is sent to OLT by first optical module, an ODN and optical branching device.
19. system according to claim 18 is characterized in that, also comprises business module among the described ONU;
Described OLT, the upstream data transmitting time that will determine according to the distance measurement value of backup path and second light mouth sign are carried in the GATE frame and are sent to optical branching device;
Optical branching device sends to first optical module and second optical module among the ONU with the GATE frame that carries the upstream data transmitting time and second light mouth sign respectively by ODN on the primary path and the 2nd ODN on the backup path;
Module is switched in protection; monitor after described any one optical module receives the GATE frame that carries upstream data transmitting time and second light mouth sign; second optical module is switched to the main optical module of using; the upstream data of business module being sent according to the upstream data transmitting time in the GATE frame sends by second optical module, and the data that second optical module is received are sent to business module.
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