CN101873514B - Quick switch method and system under protected mode in passive optical network and optical network unit - Google Patents
Quick switch method and system under protected mode in passive optical network and optical network unit Download PDFInfo
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Abstract
The invention discloses a quick switch method and system under the protected mode in a passive optical network and an optical network unit. The method comprises the following steps: the optical network unit stores the identifier of a protected path corresponding to the optical port of an optical line terminal and a protected path building parameter; after a service path for data communication between the optical network unit and the optical line terminal is invalid, the optical line terminal starts an available optical port and synchronizes with the optical network unit via a path corresponding to the optical port, namely a destination path; the optical line terminal sends a quick switch indication message to the optical network unit and carries the identifier of the destination path, the optical network unit extracts the protected path building parameter of the destination path according to the identifier and completes the subsequent building process with the destination path of the optical line terminal by using the protected path building parameter to enter into the operation state. The invention can reduce the switching time of the optical network unit under the protected mode, reduce the data exchange amount in switching and improve the time for the optical network unit to restore normal work to millisecond level.
Description
Technical field
The present invention relates to the communications field; be specifically related to a kind of at EPON (Passive OpticalNetwork; be called for short PON) in fast switch over method, system and optical network unit (OpticalNetwork Unit is called for short ONU) under protected mode.
Background technology
Along with broadband access technology development, operator accepts just gradually and deployed fiber connecting system (Optical Access Network is called for short OAN) provides more rapid rate and higher-quality service to user.
In EPON, adopt a kind of optical fiber access technology of point-to-multipoint.As shown in Figure 1, EPON comprises by optical line terminal (Optical Line Terminal, be called for short OLT), optical network unit (ONU) and Optical Distribution Network (Optical Distribution Network is called for short ODN) form.Optical Distribution Network (ODN) is point-to-multipoint structure, an optical line terminal (OLT) connects multiple optical network units (ONU) by Optical Distribution Network (ODN) simultaneously, wherein optical network unit can be the terminal of various forms, as described below:
Optical Network Terminal (Optical Network Terminal is called for short ONT), for domestic consumer;
Multitenant unit (Multi-Dwelling Unit is called for short MDU), for many residential customers;
Business user's type ONU, for various commercial situations, and residential customer main difference with kind of interface and security requirement.
In the application deployment of EPON, the user of some type needs higher fail safe, wish that operator can provide a kind of security mechanism to guarantee that its service channel does not interrupt, or the requirement of inferior one-level is can in service channel, have no progeny and recover fast.This has just proposed protection path and the requirement of switched path fast to the EPON of carrying customer service operation.
Fig. 2 and Fig. 3 show in existing passive optical network standards two kinds of typical network architecture diagram under protected mode.
What Fig. 2 represented is the mode of the protection trunk optical fiber of type B.Two light mouth PON (0) of OLT and PON (1) are all connected to the optical splitter of a 2:N, and this optical splitter down direction is connected to each ONU by optical fiber respectively.The path that the light mouth PON (0) of OLT arrives ONU by optical splitter is primary path, and the path that the light mouth PON (1) of OLT arrives ONU by optical splitter is stand-by channel.In the service path of primary path as optical network unit and optical line terminal, have no progeny, keep communicating by letter between optical network unit and optical line terminal by enabling stand-by channel.
What Fig. 3 represented is the all-fiber protection mode of Type C.The light mouth PON (0) of OLT is connected to the optical splitter 1 of 1:N, and the light mouth PON (1) of OLT is connected to the optical splitter 2 of 1:N, and these two optical splitters are connected with each ONU by optical fiber respectively.The path that the light mouth PON (0) of OLT arrives ONU by optical splitter 1 is primary path, and the path that the light mouth PON (1) of OLT arrives ONU by optical splitter 2 is stand-by channel.In the service path of primary path as optical network unit and optical line terminal, have no progeny, keep communicating by letter between optical network unit and optical line terminal by enabling stand-by channel.
Under the existing protected mode of EPON, in conjunction with Fig. 4, to enable the process of stand-by channel after primary path fault as the logic state transition process of example explanation optical network unit:
ONU communicates by letter with the path that OLT is PON LT (0) mouthful by primary path between the two, and ONU is in running status (O5);
In primary path, have no progeny, ONU can't detect the light signal of OLT at primary path, produce after lock-out (LOS/LOF) alarm, enter ejection state (O6), ONU exceeded after the duration of TO2 timer setting in the time of ejection state (O6), entered initial condition (O1);
OLT enables the path that stand-by channel is PON LT (1) mouth, and synchronized reserve path related protocol configuration parameter (as transmitting optical power, ONU ID, T-CONT ID, GEM ID etc.), and send downlink optical signal to ONU, and ONU carries out frame demarcation and synchronous;
ONU detects after the downlink optical signal of OLT, eliminates the LOS/LOF alarm of OLT, and after being completed frame and delimited and synchronize by stand-by channel and OLT, ONU proceeds to wait state (O2) from initial condition (O1);
After the up overhead parameter that ONU reception OLT sends, proceed to serial-number-state (O3) from wait state (O2); Up overhead parameter comprises: lead code bit type; Delimiter parameter (Delimiter); The horizontal parameter of ONU transmitting optical power (being used to indicate the rank of ONU transmitting optical power) and other parameter.
OLT is switched to stand-by channel from primary path, need redistribute the ID of the ONU of its management, and the ID of the each ONU after redistributing is sent to each ONU; ONU receives after the ONU-ID information of OLT transmission, proceeds to distance measuring states (O4) from serial-number-state (O3);
ONU receives after the equalization inhibit signal (Equalization Delay is called for short EqD) of OLT transmission, proceeds to running status (O5) from distance measuring states (O4);
So far, the stand-by channel between ONU and OLT is set up completely, and ONU and OLT carry out information interaction by this stand-by channel.
In above path handoff procedure, on stand-by channel, set up after physical layer path, OLT need send the related datas such as equalization inhibit signal (EqD) to all ONU, each ONU need to upgrade self parameter after reception related data, and carry out the adjustment of transmitting power with the OLT light mouth of stand-by channel, finally could recover normal operating conditions.Describe as an example of the network configuration of type B example, when the ONU that OLT manages has 32, in handoff procedure, OLT needs and ONU makes 32 ONU all complete state transition process (experiencing O1, O2, O3, O4 and O5) as shown in Figure 4 alternately.The problem causing like this comprises: (1) each ONU all completes above-mentioned a series of state transition makes OLT need bear a large amount of message transmission work, (2) in processing procedure, due to the finite capacity of path between OLT and ONU, for example, at a 125us Gigabit Passive Optical Network (Gigabit-CapablePassive Optical Network, be called for short GPON) GPON transmission conversion downlink frame (GPONTransmission Conversion, be called for short GTC) in do not have enough capacity to deposit Physical Layer OAM (Physical Layer Operation Administration and Maintenance, being called for short PLOAM) message supports 32 ONU to complete aforesaid state transition process simultaneously, so most of ONU need to wait for the arrival of news, extend the time of switching, affect the fast quick-recovery proper communication of ONU and OLT, make ONU and OLT recover normal work substantially consuming time at 100 milliseconds more than magnitude, can not meet the requirement of user to the fast quick-recovery of network failure.
Summary of the invention
The technical problem to be solved in the present invention is to provide method and system and the optical network unit that a kind of EPON protected mode is switched fast, reduces the time that optical network unit switches.
In order to address the above problem, the invention provides the method that EPON protected mode is switched fast, comprising: the mark of the protection path of the light mouth correspondence of optical network unit storage optical line terminal and protection path setting parameter; Between described optical network unit and described optical line terminal, carry out the service path of data communication invalid after, described optical line terminal is enabled an available light mouth and is that target path is synchronizeed with described optical network unit by the path of this light mouth correspondence; Described optical line terminal sends quick switch indicating information to described optical network unit; and the mark of carrying described target path; described optical network unit is according to the protection path setting parameter of the described target path of described marker extraction storage; complete and the follow-up process of establishing of the target path of described optical line terminal by this protection path setting parameter; enter running status, this target path and the described optical line terminal that complete by foundation carry out information interaction.
Further, said method can also have following characteristics:
The protection path setting parameter of the protection path of described optical network unit storage at least comprises following message: lead code bit type, delimiter parameter, the horizontal parameter of optical network unit transmitting optical power and equalization inhibit signal; Described optical network unit completes and synchronizes and enter after wait state with described optical line terminal, and described optical line terminal sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
Further, said method can also have following characteristics:
The protection path setting parameter of the protection path of described optical network unit storage at least comprises equalization inhibit signal; Described optical network unit completes and synchronizes with described optical line terminal, receives up overhead parameter and enters after serial-number-state from described optical line terminal; Described optical line terminal sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
Further, said method can also have following characteristics:
The protection path setting parameter of the protection path of described optical network unit storage at least comprises equalization inhibit signal; Described optical network unit completes and synchronizes and receive up overhead parameter and enter after distance measuring states from described optical line terminal with described optical line terminal; Described optical line terminal sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
Further, said method can also have following characteristics:
Described service path is the primary path in EPON, and described target path is the stand-by channel in EPON; Or; Described service path is the stand-by channel in EPON, and described target path is the primary path in EPON.
In order to address the above problem, the system that the present invention also provides EPON protected mode to switch fast, comprise optical line terminal and the optical network unit being connected with described optical line terminal, described optical line terminal comprises switching controls module, described switching controls module, for after the service path that carries out data communication between described optical network unit and described optical line terminal is invalid, enables an available light mouth and be that target path completes and synchronizes with described optical network unit by the path of this light mouth correspondence; Described optical network unit comprises quick handoff parameter memory module and quick switching controls module; Described switching controls module, also for after completing by described target path and described optical network unit with described optical network unit at described optical line terminal and synchronizeing, send quick switch indicating information to described optical network unit, and carry the mark of described target path; Described quick handoff parameter memory module, for storing mark and the protection path setting parameter of protection path of light mouth correspondence of described optical line terminal; Described quick switching controls module; the described quick switch indicating information sending for receiving described switching controls module; and according to the protection path setting parameter of the described target path of described marker extraction storage; complete and the follow-up process of establishing of the target path of described optical line terminal by this protection path setting parameter, make described optical network unit enter running status.
Further, said system can also have following characteristics:
The protection path setting parameter of the protection path of described optical network unit storage at least comprises following message: lead code bit type, delimiter parameter, the horizontal parameter of optical network unit transmitting optical power and equalization inhibit signal; Described switching controls module, also, for entering after wait state at described optical network unit, sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
Further, said system can also have following characteristics:
The protection path setting parameter of the protection path of described optical network unit storage at least comprises equalization inhibit signal; Described quick switching controls module also, for after described optical line terminal completes and synchronizes, makes described optical network unit enter serial-number-state or distance measuring states after described optical line terminal receives up overhead parameter; Described switching controls module, also for entering after serial-number-state at described optical network unit, or enters after distance measuring states at described optical network unit, sends quick switch indicating information, and carry the mark of described target path to described optical network unit.
In order to address the above problem, the optical network unit that the present invention also provides a kind of EPON protected mode to switch fast, described optical network unit comprises quick handoff parameter memory module and quick switching controls module; Described quick handoff parameter memory module, for store described optical line terminal light mouth correspondence protection path mark and protection path build parameter; Described quick switching controls module, for with optical line terminal between carry out the service path of data communication and complete and synchronize with described optical line terminal after invalid, and receive the quick switch indicating information of the mark of carrying target path that optical line terminal sends, and according to the structure parameter of the described target path of described marker extraction storage, build parameter by this and complete and the follow-up process of establishing of the target path of described optical line terminal, make described optical network unit enter running status.
Further, above-mentioned optical network unit can also have following characteristics:
The protection path setting parameter of the protection path of described optical network unit storage at least comprises following message: lead code bit type, delimiter parameter, the horizontal parameter of optical network unit transmitting optical power and equalization inhibit signal; Described quick switching controls module, also for entering after wait state at described optical network unit, receives the quick switch indicating information that described optical line terminal sends.
Adopt method of the present invention, can simplify the switching flow of optical network unit under protected mode, reduce switching time, and the data interaction amount between optical network unit and optical line terminal in minimizing handoff procedure, the time that makes optical network unit recover normal work under protected mode is brought up to a millisecond magnitude, make passive optical network fast quick-recovery communication in the time there is line fault, and, adopt method of the present invention, while switching under protected mode, do not need the structural relation and the OLT that change former OLT and ONU to identify for the ONU that identifies ONU, do not need the institutional framework that changes original system composition can complete fast switching.
Brief description of the drawings
Fig. 1 is the composition structure chart of EPON;
Fig. 2 is the trunk optical fibre protection structural representation of EPON protected mode Types Below B;
Fig. 3 is the all-fiber protection structural representation of EPON protected mode Types Below C;
Fig. 4 is the logic state in optical network unit handoff procedure migration schematic diagram under protected mode in prior art;
Fig. 5 is the structure chart of optical network unit fast switching system in embodiment;
Fig. 6 is the flow chart of optical network unit fast switch over method in embodiment;
Fig. 7 is the migration of the logic state in optical network unit handoff procedure schematic diagram in specific embodiment one;
Fig. 8 is the migration of the logic state in optical network unit handoff procedure schematic diagram in specific embodiment two;
Fig. 9 is the migration of the logic state in optical network unit handoff procedure schematic diagram in specific embodiment three.
Embodiment
As shown in Figure 5, optical network unit carries out the system of switching fast, comprises optical line terminal and the optical network unit being connected with described optical line terminal, and optical line terminal comprises switching controls module; Optical network unit comprises quick handoff parameter memory module and quick switching controls module;
Switching controls module, invalid for the service path carrying out data communication between optical network unit and optical line terminal after, enable an available light mouth and be that target path completes and synchronizes with optical network unit by the path of this light mouth correspondence; Also for entering after wait state at described optical network unit, or, enter serial-number-state, or, enter distance measuring states, send quick switch indicating information to optical network unit, carry the mark of described target path;
Fast handoff parameter memory module, for storing mark and the protection path setting parameter of protection path of light mouth correspondence of described optical line terminal;
Switching controls module fast; the described quick switch indicating information sending for receiving described switching controls module; and according to the protection path setting parameter of the described target path of described marker extraction storage; complete and the follow-up process of establishing of the target path of described optical line terminal by this protection path setting parameter, make described optical network unit enter running status.
Wherein, service path is the primary path in EPON, and target path is the stand-by channel in EPON; Or service path is the stand-by channel in EPON, target path is the primary path in EPON.
Under the protected mode of EPON; optical line terminal is connected by one or more optical splitters with multiple optical network units; on optical line terminal, can there is more than one light mouth; the path that each light mouth is connected with each optical network unit by optical splitter is called protection path, on optical line terminal, has one to protect above path.Protection path is generally divided into primary path and stand-by channel; as shown in Figures 2 and 3; the path of PONLT (0) light mouth correspondence is primary path; the path of PON LT (1) light mouth correspondence is stand-by channel; the present invention is not limited to the network configuration shown in Fig. 2 Fig. 3, and optical line terminal can have above multiple primary paths and/or more than one stand-by channel simultaneously.Fast switch over method in the present invention can be used for being switched to stand-by channel from primary path, also can be used for being switched to primary path from stand-by channel.
As shown in Figure 6; in optical network unit fast switch over method, the path of optical network unit and optical line terminal proper communication is called to service path, in service path, has no progeny; the protection path that optical line terminal is enabled is called target path, and optical network unit fast switch over method specifically comprises the following steps:
OLT and ONU are on service path when proper communication, OLT is protected the mark of path and protection path setting parameter to be sent to each ONU by PLOAM message (as Upstream Overhead, Rang Time), and ONU receives mark and the protection path setting parameter of the each protection path of rear storage; Or the mark of the protection path of ONU storage and protection path setting parameter are the contents of system default, need not obtain from OLT.
The mode of the protection path setting parameter of optical network unit storage one protection path can have multiple.For example, a corresponding one group of parameter of protection path, has comprised protection path setting parameter corresponding to this protection path in this group parameter.Also can be, the corresponding protection of protection path path setting parameter is divided into many groups, these many group parameters be all corresponding to this protection path.Optical network unit can have multiple to the storage mode of protection path setting parameter, and is not construed as limiting the invention, as long as optical network unit can pick out the protection path setting parameter separately that different protection paths is corresponding.
OLT sends and switches fast message to all ONU, as shown in the table, the mark of indicating target path in this message.This switches fast message and can also send in the mode of PLOAM broadcast.
The method of the present embodiment; while switching under protected mode; do not need to change the structural relation of former OLT and ONU and OLT for identifying the ONU mark (do not need prior art ONU from O3 state to O4 state procedure redistribute the process of mark for ONU) of ONU, do not need to change the institutional framework that original system forms and can complete fast switching.
Describe optical network unit fast switch over method in the present invention in detail with three specific embodiments below.
Specific embodiment one, as shown in Figure 7, optical network unit, in handoff procedure, is directly transformed into state O5 from state O2.Specifically comprise the following steps:
Protection path setting parameter corresponding to each protection path, at least comprises following information:
Lead code bit type;
Delimiter parameter (Delimiter);
The horizontal parameter of ONU transmitting optical power;
Equalization inhibit signal EqD (Equalization Delay).
Each protection in the protection path setting parameter that path is corresponding can also comprise ONU ID.
Step 2, between optical network unit and optical line terminal, carry out the service path of data communication invalid after, optical line terminal is enabled an available light mouth and is completed and synchronize with optical network unit by the target path of this light mouth correspondence, and optical network unit enters wait state (O2); The process of this step 2 is identical with existing state transitions process in background technology, is not repeating herein.
Step 3; optical line terminal sends quick switch indicating information to optical network unit; and the mark of carrying target path; optical network unit is stored the protection path setting parameter of described target path according to this marker extraction; complete and the process of establishing of the target path of optical line terminal by this protection path setting parameter; and proceed to running status, carry out information interaction by this target path and described optical line terminal.
Optical network unit configures switch data unit group in normal operating conditions; Optical line terminal is after service path is invalid; to sending quick switching command in the ONU of wait state (O2) by broadcast; optical-fiber network selects corresponding data unit in data sheet tuple to be configured stand-by channel according to switching command message institute information; do not need through serial-number-state and distance measuring states; directly enter running status (O5); do not need to change required data transmission procedure through O2 to O5 state consuming time between ONU and OLT; simple flow; reduce switching time, to reach the object of switching fast under protected mode.
Specific embodiment two, as shown in Figure 8, optical network unit, in handoff procedure, is directly transformed into state O5 from state O3.Specifically comprise the following steps:
The relevant protection path setting parameter of each protection path, at least comprises following information:
Equalization inhibit signal EqD (Equalization Delay).
Each protection in the protection path setting parameter that path is corresponding can also comprise ONU ID.
Step 2, between optical network unit and optical line terminal, carry out the service path of data communication invalid after, optical line terminal is enabled an available light mouth and is completed and synchronize with optical network unit by the target path of this light mouth correspondence, and optical network unit receives up overhead parameter serial-number-state (O3) from described optical line terminal; The process of this step 2 is identical with existing state transitions process in background technology, is not repeating herein.
Step 3; optical line terminal sends quick switch indicating information to optical network unit; and the mark of carrying target path; optical network unit is stored the protection path setting parameter of described target path according to this marker extraction; complete and the process of establishing of the target path of optical line terminal by this protection path setting parameter; and proceed to running status, carry out information interaction by this target path and described optical line terminal.
Optical network unit configures switch data unit group in normal operating conditions; Optical line terminal is after service path is invalid; to sending quick switching command in the ONU of serial-number-state (O3) by broadcast; optical-fiber network selects corresponding data unit in data sheet tuple to be configured stand-by channel according to switching command message institute information; do not need through distance measuring states; directly enter running status (O5); do not need to change required data transmission procedure through O3 to O5 state consuming time between ONU and OLT; simple flow; reduce switching time, to reach the object of switching fast under protected mode.
Specific embodiment three, as shown in Figure 9, optical network unit, in handoff procedure, is directly transformed into state O5 from state O4.Specifically comprise the following steps:
The relevant protection path setting parameter of each protection path, at least comprises following information:
Equalization inhibit signal EqD (Equalization Delay).
Step 2, between optical network unit and optical line terminal, carry out the service path of data communication invalid after, optical line terminal is enabled an available light mouth and is completed and synchronize with optical network unit by the target path of this light mouth correspondence, and optical network unit receives up overhead parameter and enters distance measuring states (O4) from described optical line terminal; The process of this step 2 is identical with existing state transitions process in background technology, is not repeating herein.
Step 3; optical line terminal sends quick switch indicating information to optical network unit; and the mark of carrying target path; optical network unit is stored the protection path setting parameter of described target path according to this marker extraction; complete and the process of establishing of the target path of optical line terminal by this protection path setting parameter; and proceed to running status, carry out information interaction by this target path and described optical line terminal.
Optical network unit configures switch data unit group in normal operating conditions; Optical line terminal is after service path is invalid; to sending quick switching command in the ONU of distance measuring states (O4) by broadcast; optical-fiber network selects corresponding data unit in data sheet tuple to be configured stand-by channel according to switching command message institute information; directly enter running status (O5); do not need through EqD data transmission procedure consuming time between ONU and OLT; simple flow, reduces switching time, to reach the object of switching fast under protected mode.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the method that EPON protected mode is switched fast, comprising:
The mark of the protection path of the light mouth correspondence of optical network unit storage optical line terminal and protection path setting parameter;
Between described optical network unit and described optical line terminal, carry out the service path of data communication invalid after, described optical line terminal is enabled an available light mouth and is that target path is synchronizeed with described optical network unit by the path of this light mouth correspondence;
Described optical line terminal sends quick switch indicating information to described optical network unit; and the mark of carrying described target path; described optical network unit is according to the protection path setting parameter of the described target path of described marker extraction storage; complete and the follow-up process of establishing of the target path of described optical line terminal by this protection path setting parameter; enter running status, this target path and the described optical line terminal that complete by foundation carry out information interaction.
2. the method for claim 1, is characterized in that,
The protection path setting parameter of the protection path of described optical network unit storage at least comprises following message: lead code bit type, delimiter parameter, the horizontal parameter of optical network unit transmitting optical power and equalization inhibit signal;
Described optical network unit completes and synchronizes and enter after wait state with described optical line terminal, and described optical line terminal sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
3. the method for claim 1, is characterized in that,
The protection path setting parameter of the protection path of described optical network unit storage at least comprises equalization inhibit signal;
Described optical network unit completes and synchronizes with described optical line terminal, receives up overhead parameter and enters after serial-number-state from described optical line terminal; Described optical line terminal sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
4. the method for claim 1, is characterized in that,
The protection path setting parameter of the protection path of described optical network unit storage at least comprises equalization inhibit signal;
Described optical network unit completes and synchronizes and receive up overhead parameter and enter after distance measuring states from described optical line terminal with described optical line terminal; Described optical line terminal sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
5. the method as described in arbitrary claim in claim 1 to 4, is characterized in that,
Described service path is the primary path in EPON, and described target path is the stand-by channel in EPON; Or;
Described service path is the stand-by channel in EPON, and described target path is the primary path in EPON.
6. the system that EPON protected mode is switched fast, comprise optical line terminal and the optical network unit being connected with described optical line terminal, described optical line terminal comprises switching controls module, described switching controls module, for after the service path that carries out data communication between described optical network unit and described optical line terminal is invalid, enables an available light mouth and be that target path completes and synchronizes with described optical network unit by the path of this light mouth correspondence; It is characterized in that,
Described optical network unit comprises quick handoff parameter memory module and quick switching controls module;
Described switching controls module, also for after completing by described target path and described optical network unit with described optical network unit at described optical line terminal and synchronizeing, send quick switch indicating information to described optical network unit, and carry the mark of described target path;
Described quick handoff parameter memory module, for storing mark and the protection path setting parameter of protection path of light mouth correspondence of described optical line terminal;
Described quick switching controls module; the described quick switch indicating information sending for receiving described switching controls module; and according to the protection path setting parameter of the described target path of described marker extraction storage; complete and the follow-up process of establishing of the target path of described optical line terminal by this protection path setting parameter, make described optical network unit enter running status.
7. system as claimed in claim 6, is characterized in that,
The protection path setting parameter of the protection path of described optical network unit storage at least comprises following message: lead code bit type, delimiter parameter, the horizontal parameter of optical network unit transmitting optical power and equalization inhibit signal;
Described switching controls module, also, for entering after wait state at described optical network unit, sends quick switch indicating information to described optical network unit, and carries the mark of described target path.
8. system as claimed in claim 6, is characterized in that,
The protection path setting parameter of the protection path of described optical network unit storage at least comprises equalization inhibit signal;
Described quick switching controls module also, for after described optical line terminal completes and synchronizes, makes described optical network unit enter serial-number-state or distance measuring states after described optical line terminal receives up overhead parameter;
Described switching controls module, also for entering after serial-number-state at described optical network unit, or enters after distance measuring states at described optical network unit, sends quick switch indicating information, and carry the mark of described target path to described optical network unit.
9. the optical network unit that EPON protected mode is switched fast, is characterized in that,
Described optical network unit comprises quick handoff parameter memory module and quick switching controls module;
Described quick handoff parameter memory module, for store optical line terminal light mouth correspondence protection path mark and protection path build parameter;
Described quick switching controls module, for with optical line terminal between carry out the service path of data communication and complete and synchronize with described optical line terminal after invalid, and receive the quick switch indicating information of the mark of carrying target path that optical line terminal sends, and according to the structure parameter of the described target path of described marker extraction storage, build parameter by this and complete and the follow-up process of establishing of the target path of described optical line terminal, make described optical network unit enter running status.
10. optical network unit as claimed in claim 9, is characterized in that,
The protection path setting parameter of the protection path of described optical network unit storage at least comprises following message: lead code bit type, delimiter parameter, the horizontal parameter of optical network unit transmitting optical power and equalization inhibit signal;
Described quick switching controls module, also for entering after wait state at described optical network unit, receives the quick switch indicating information that described optical line terminal sends.
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| EP2744155A4 (en) * | 2011-09-05 | 2014-11-12 | Huawei Tech Co Ltd | Data communication method in optical network system, and optical network unit and system |
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