CN101615927A - A kind of reverse method of multi-plexing light accessing system, device and system - Google Patents
A kind of reverse method of multi-plexing light accessing system, device and system Download PDFInfo
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- CN101615927A CN101615927A CN200810126402A CN200810126402A CN101615927A CN 101615927 A CN101615927 A CN 101615927A CN 200810126402 A CN200810126402 A CN 200810126402A CN 200810126402 A CN200810126402 A CN 200810126402A CN 101615927 A CN101615927 A CN 101615927A
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Abstract
Embodiments of the invention disclose a kind of reverse method, device and system of multi-plexing light accessing system, the local side of described multi-plexing light accessing system comprises first interface and second interface, first interface is couple to operating path, second interface is couple to backup path, and described method comprises: obtain from first interface and send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second interface; According to the time difference between time of described two time points and/or two time points, obtain the adjustment time that sends descending frame head from second interface; According to the time of described adjustment time adjustment, carry out from first interface switching to second interface from described second interface transmission descending frame head.Embodiments of the invention can be adjusted the descending frame head of spare interface by in the process normal, have avoided ONU to enter and have re-registered and distance measuring states, have saved a large amount of switching times, and ONU does not roll off the production line simultaneously, to almost not influence of business.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of reverse method, device and system of multi-plexing light accessing system.
Background technology
(Passive Optical Network, PON) system is a kind of system that the light access solution is provided for the user to EPON.The PON system comprises and is arranged on local side (Central Office, CO) optical line terminal equipment (Optical Line Termination, OLT), by Optical Distribution Network (OpticalDistribution Network, ODN) be connected to user resident network (Customer Premise Netwrok, CPN) customer premises equipment, CPE (Optical Network Unit, ONU or Optical NetworkTermination, ONT), mainly comprise by light shunt/mixer passive devices such as (Splitter) among the wherein passive ODN of being meant, do not need or only need a small amount of valuable active electronic equipment.In the PON system, main signal processing function is finished at local side apparatus OLT and customer premises equipment, CPE ONU/ONT.Divide from the content of carrying, now typical PON system comprises APON/BPON (ATM Based PON), EPON (Ethernet Based PON) and GPON (Gigabit PON) etc., base; Divide from the wavelength transmission mode, the time division multiplexing of being divided into EPON TDM-PON and Wave division multiplexing passive optical network (Wave Division Multiple PON, WDM PON), code division multiplexing EPON CDMA-PON are arranged.
Along with the development and the application of passive optical network technique, more and more higher to the requirement of systematic function, thus proposition is to the demand of PON system protection, comprising device-level protection and/or line level protection.Wherein, the protection of line level relates to the protection of active and standby optical fiber, does not influence business when guaranteeing wherein a light fault; Device-level protection relates to the protection of active and standby processing module, does not influence business when guaranteeing one of them processing module fault.
Realizing that protection need consider the influence of active and standby propagation delay time when switching, need adjust time delay during active and standby switching.The adjustment mode is in existing: open up range-finder window, respectively each user is found range, the result calculates time-delay according to range finding, thereby utilizes the time-delay of calculating to adjust.For example for PON port backup networking schematic diagram shown in Figure 1: the local side OLT of PON system comprises two PON module PON LT1 and PON LT2, be connected with F2 with the optical fiber F1 of ODN respectively with port 2 (or claiming passage 1 and passage 2) by port one respectively, serve as the main PON module of using with PON LT1 below, port one is the interface of operating path, PON LT1 is and with the PON module, port 2 is the interface of backup path, describes the masterslave switchover process of prior art, as shown in Figure 2, may further comprise the steps:
Step s201, when active and standby interface need be switched, stop to send data from port one (interface of operating path), ONU rolls off the production line successively;
Step s202, each ONU is registered and find range by port 2 (interface of backup path), thereby obtain the delay parameter that port 2 is correlated with, as balanced time delay (Equalization Delay, EQD), EQD is a wait time-delay of doing in ONU inside in order to guarantee ONU that up conflict does not take place, and makes all ONU all be in same physical distance;
Step s203, after online ONU is reached the standard grade again before all, set up by the network that the interface of original backup path is leading, masterslave switchover is finished.
In realizing process of the present invention, the inventor finds that there is following shortcoming at least in prior art:
Adopt this mode, re-register after each online ONU need roll off the production line and reach the standard grade, and OLT can only carry out the registration operation of an ONU at every turn, finishing all users' range finding just can switch, can expend a large amount of time like this, cause that the time of reaching the standard grade of ONU is slow in the masterslave switchover process, time of service interruption is long; And each ONU needs range finding again to determine new EQD, so consuming time very long in whole reversed process.On the other hand, along with increasing of number of users, the time of range finding further extends, and all can not put up with for operator and user.So this protection structure can not satisfy the requirement of protection switch time when breaking down in system.
Summary of the invention
Embodiments of the invention provide a kind of reverse method, device and system of multi-plexing light accessing system, to simplify active and standby interface inverting flow process, shorten break period professional in the masterslave switchover process.
Embodiments of the invention provide a kind of reverse method of multi-plexing light accessing system, and the local side of described multi-plexing light accessing system comprises first interface and second interface, and described first interface is couple to operating path, and described second interface is couple to backup path, comprising:
Obtain from first interface and send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second interface;
According to the time difference between time of described two time points and/or two time points, obtain the adjustment time that sends descending frame head from second interface;
According to the time of described adjustment time adjustment, carry out from first interface switching to second interface from described second interface transmission descending frame head.
The embodiment of the invention also provides a kind of optical line terminal, and described optical line terminal comprises first functional module interface, second functional module interface and control module,
Described first functional module interface is used to provide the interface processing capacity of operating path;
Described second functional module interface is used to provide the interface processing capacity of backup path;
Described control module, being used to obtain described first functional module interface sends descending frame head and second functional module interface and receives time of two time points of up frame head and/or the time difference between two time points, according to the time difference between time of described two time points and/or two time points, obtain the adjustment time of second functional module interface transmission descending frame head, according to the time of described adjustment time adjustment, control of the switching of described first functional module interface to described second functional module interface from described second functional module interface transmission descending frame head.
The embodiment of the invention also provides a kind of multi-plexing light accessing system, described multi-plexing light accessing system comprises optical line terminal and Optical Network Terminal, access path between described optical line terminal and the described Optical Network Terminal comprises operating path and backup path, described optical line terminal comprises first interface and second interface, described first interface couples operating path, described second interface couples backup path
Described optical line terminal, be used to obtain from first interface and send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second interface, according to the time difference between time of described two time points and/or two time points, obtain the adjustment time that sends descending frame head from second interface; Send the time of the adjustment time adjustment of descending frame head according to described interface, carry out switching from the operating path to the backup path from described second interface transmission descending frame head from backup path.
The embodiment of the invention also provides a kind of control device of switching, and switches control device and comprises: adjust time acquisition unit, adjust time acquisition unit, adjustment unit, switch control unit; The described control device of switching also comprises the very first time acquiring unit and/or second time acquisition unit; Wherein,
Described very first time acquiring unit is used to obtain from the interface of operating path and sends descending frame head and receive time of two time points of up frame head from the interface of backup path;
Described second time acquisition unit is used to obtain from the interface of operating path and sends descending frame head and receive time between two time points of up frame head from the interface of backup path;
Described adjustment time acquisition unit is used for the adjustment time between the interface of the interface in the time difference evaluation work path that time of obtaining according to described very first time acquiring unit and/or described second time acquisition unit obtain and backup path; Described adjustment unit, the adjustment time that is used for obtaining according to described adjustment time acquisition unit is adjusted the time that sends descending frame head from the interface of backup path;
Switch control unit, be used for after the adjustment unit adjustment sends the time of descending frame head from the interface of backup path, the interface in Control work path is switched to the interface of backup path.
Embodiments of the invention have the following advantages:
Can be normal by in the process, send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second interface by obtaining from first interface, thereby adjust the descending frame head of spare interface, avoided ONU to enter and re-registered and distance measuring states, saved a large amount of switching times, ONU does not roll off the production line simultaneously, to almost not influence of business.
Description of drawings
Fig. 1 is the well known port backup networking diagram of EPON in the prior art;
Fig. 2 is the flow chart that the master-backup port of the passive optical network OLT of prior art is switched;
Fig. 3 is the structural representation of the changeover apparatus of the active and standby interface of OLT equipment in the embodiment of the invention;
Fig. 4 is the structural representation of the network equipment in one embodiment of the invention;
Fig. 5 is the structural representation of the network equipment in another embodiment of the present invention;
Fig. 6 is the flow chart of the active and standby interface inverting method of OLT equipment in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described further.
Embodiments of the invention provide a kind of control device of switching, and as shown in Figure 3, comprising:
Very first time acquiring unit 11 is used to obtain from the interface of operating path and sends descending frame head and receive time of two time points of up frame head from the interface of backup path;
Second time acquisition unit 12 is used for obtaining the time difference by (time period) timing two time points that the interface transmission descending frame head from operating path received up frame head to the interface from backup path; As passing through a timer, send descending frame head from the interface of operating path and pick up counting, finish the timing record and send descending frame head and receive time difference between the up frame head from the interface of backup path from the interface of operating path thereby receive up frame head from the interface of backup path;
Adjust time acquisition unit 13, be used for the adjustment time between the interface of the interface in evaluation work path and backup path, as can according to very first time acquiring unit obtain from the interface of operating path send the time of descending frame head and receive the interface of Time Calculation operating path of up frame head from the interface of backup path and the interface of backup path between the adjustment time, perhaps the interface from operating path that obtains according to second time acquisition unit 12 sends the adjustment time descending frame head receives the interface in time difference evaluation work path of up frame head and backup path to the interface from backup path the interface;
Wherein, the very first time acquiring unit 11 in the active/standby changeover apparatus and second time acquisition unit 12 can only need wherein any one, also can two exist simultaneously.In addition, very first time acquiring unit 11 can be by the functional module interface of monitoring operating path, the functional module interface in writing task path sends the time of descending frame head, and/or can obtain the time that sends descending frame head from the interface of operating path according to detected synchronizing signal by detecting synchronizing signal.Very first time acquiring unit 11 writes down the time that up frame head arrives the functional module interface of backup path by the functional module interface of monitoring backup path, thereby obtains to receive from the interface of backup path the time of up frame head.Second time acquisition unit 12 can be by monitoring the functional module interface of operating path and the functional module interface of backup path, the functional module interface that detects operating path picks up counting when sending descending frame head, the functional module interface that detects backup path finishes timing when receiving up frame head, thereby obtains sending descending frame head and receiving time difference between the up frame head from the interface of backup path from the interface of operating path.
Be illustrated in figure 4 as a instantiation based on Fig. 3.Embodiments of the invention provide the network equipment in a kind of EPON, the management of responsible Business Processing distribution, ONU, synchronised clock processing etc.In an embodiment of the present invention, as shown in Figure 4, this network equipment 300 comprises:
One or more network side business interface functional module PON NT380, the business datum message and/or the administrative message of responsible transmitting-receiving and upper layer network equipment.
At least two interfaces wherein have the interface of a backup path at least, when the interface of the operating path corresponding with the interface of backup path need switch, can switch to the interface of backup path from the interface of this operating path.
At least two logics are line interface functional module PON LT 340 independently, and respectively corresponding interface is finished the line interface termination, and and network side business interface functional module 380 intercommunications.Wherein, each line interface functional module PON LT340 comprises at least one photoelectric conversion module 342 and at least one message processing module (MPM) 344, comprises two photoelectric conversion module 342-11,342-12 as PON LT340-1, a message processing module (MPM) 344-1.Message processing module (MPM) 344 is responsible for functions such as Business Processing, synchronised clock processing, frame head processing.Photoelectric conversion module 342 is realized light-to-current inversion and/or electro-optical conversion, and the module that can be transceiver also can be the transmitting-receiving separate modules.Wherein, on message processing module (MPM) 344-1, the 344-M two photoelectric conversion modules being arranged respectively in the equipment that Fig. 4 describes is an example, and the photoelectric conversion module that each message processing module (MPM) connect does not limit, and can be one, and two, three, perhaps four or the like.In context, be example, repeat no more if no special instructions with two photoelectric conversion modules.
In embodiments of the present invention for realizing the protection switch function; the network equipment 300 comprises a control module 360; the controlled function of can execute protection switching; the structure of control module 360 is consistent with the structure of the changeover apparatus shown in Fig. 3; comprise the very first time acquiring unit 11 and/or second time acquisition unit 12, adjust time acquisition unit 13, memory cell 15, adjustment unit 17 and switch control unit 19.The function of these unit of control module 360 is seen the concrete structure and the description of changeover apparatus among Fig. 3, is not repeated in this description at this.The also optical transceiver module (not shown) of transceiver of Optical Receivers 342-11 and light emission module 342-12 wherein.With the functional module interface of PON LT340-1 as operating path, PON LT340-M is an example as the functional module interface of backup path, message processing module (MPM) 344-1 sends to control module 360 with descending frame head, the uplink frame hair that message processing module (MPM) 344-M will receive is given control module 360, so the very first time acquiring unit of control module 360 and/or second time acquisition unit can obtain to send descending frame head from the interface of operating path according to the frame head that message processing module (MPM) 340-1 and message processing module (MPM) 340-M send and receive time the up frame head to the interface from backup path.Frame head synchronization module 390 can also offer the down-going synchronous clock signal control module 360, so that control module 360 can obtain to send the time of descending frame head or conduct sends descending frame head from main port reference from main port according to the down-going synchronous clock signal.
Be illustrated in figure 5 as the another kind of network equipment schematic diagram that the embodiment of the invention provides.The network equipment 400 in Fig. 5 comprise at least two PON LT420 (as PON LT420-1 ..., 420-M), network side business interface module 380 and frame head synchronization module 390.Similar with PON LT340 among Fig. 4, comprise at least one message processing module (MPM) on each PON LT, each message processing module (MPM) 344 couples at least one photoelectric conversion module 342, as comprising message processing module (MPM) 344-1, photoelectric conversion module 342-11,342-12 on the PON LT420-1.Different with PON LT340 among Fig. 4 is, comprises on each PON LT420 that the PON LT at a control module 360 and self place and the message processing module (MPM) on other PON LT couple, and can receive the frame head that message processing module (MPM) sends.Concrete, with PON LT420-M is the functional module interface of backup path, PON LT420-1 is that the functional module interface of operating path is carried out by control module 360-M that to switch controlled function be example, control module 360-M receives the descending frame head that message processing module (MPM) 344-1 sends, and reception is from the up frame head of message processing module (MPM) 344-M transmission, thereby obtain sending the time of descending frame head and receiving these two times of up frame head from the interface of backup path from the interface of operating path, and/or obtain from the interface of operating path send descending frame head time and from the interface of backup path receive up frame head between time difference.PON LT420-M also can obtain main port by the clock signal that frame head synchronization module 390 provides and send the time of descending frame head or conduct sends descending frame head from main port reference.The device of switching that the application of the invention the foregoing description provides, adjustment sends the time of descending frame head from the interface of backup path, it is consistent that the descending frame head that the descending frame head that sends from the interface of backup path and interface from operating path are sent arrives the interface in time service path of ONU, adopt this mode to carry out the masterslave switchover of port, avoided ONU to enter and re-registered and distance measuring states, saved a large amount of switching times, ONU does not need to roll off the production line simultaneously, to almost not influence of business.
In an embodiment of the present invention, can realize " 1:1 " protection, also can realize " 1:N " protection.Wherein, the interface of each operating path of " 1:1 " protection expression all has the interface of a backup path to back up; The interface of N operating path of " 1:N " protection expression is shared the interface of a backup path.For the implementation method of " 1:N " protection, similar with the method for above-mentioned " 1:1 " protection, be not repeated in this description at this.
According to the embodiment of the invention, multi-plexing light accessing system comprises optical line terminal and Optical Network Terminal, access path between described optical line terminal and the described Optical Network Terminal comprises operating path and backup path, described optical line terminal comprises first interface and second interface, described first interface couples operating path, described second interface couples backup path, described optical line terminal, be used to obtain from first interface and send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second interface, according to the time difference between time of described two time points and/or two time points, obtain the adjustment time that sends descending frame head from second interface; Send the time of the adjustment time adjustment of descending frame head according to described interface, carry out switching from the operating path to the backup path from described second interface transmission descending frame head from backup path.
Conversion control method to control corresponding functional module among Fig. 2,3,4 further specifies below.Is example with line interface functional module PON LT420-M as the backup of PON LT420-1, photoelectric conversion module 342-11 is a light emission module, photoelectric conversion module 342-12 is an Optical Receivers, photoelectric conversion module 342-M1 is a light emission module, photoelectric conversion module 342-M2 is an Optical Receivers, be that the downlink optical signal that photoelectric conversion module 342-11 sends sends to Optical Network Terminal by operating path (or being called primary path), photoelectric conversion module 342-M2 receives the uplink optical signal from backup path.
In normal course of communications, acquisition sends the time of descending frame head and receives time of up frame head from the interface of backup path from the interface of operating path, and/or obtain to send the time of descending frame head and to receive time difference between the up frame head with interface from the interface of backup path from main, in the time need switching to the interface of backup path from the interface of operating path, the interface of adjusting backup path according to time of above-mentioned acquisition and/or time difference sends the time of descending frame head, it is consistent that the descending frame head that the descending frame head that sends from the interface of backup path and interface from operating path are sent arrives time of ONU, time is carried out switching of interface from the interface of operating path to backup path after adjusting, thereby realizes the masterslave switchover of OLT device port.
Concrete, as shown in Figure 6, the OLT device switching method in the embodiment of the invention may further comprise the steps:
Step s601, obtain from the interface of operating path and send descending frame head and receive the time of two time points of up frame head, and/or obtain to send the time of descending frame head and receive time difference between two time points of up frame head from the interface of backup path with interface from main from the interface of backup path;
Step s602, adjust the time that sends descending frame head from the interface of backup path according to the time difference between time of above-mentioned two time points and/or two time points, make the time of the descending frame head arrival ONU that itself and interface from operating path sends consistent.
The interface in step s603, execution work path is switched to the interface of backup path.
Concrete, in the embodiments of the invention, can be by the functional module interface in monitoring path and the functional module interface of backup path, obtain to send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from the interface of backup path from the interface of operating path; This method is for adopting the method for sending frame head mutually, and the functional module interface of operating path sends to this descending frame head control module simultaneously when ONU sends descending frame head, for example, descending frame head is driven into two-way, and riches all the way gives ONU, and another road sends to control module.After control module receives the descending frame head that the functional module interface of operating path sends, can obtain the descending frame head position of the interface of operating path, the time point of this descending frame head position can be noted by the high frequency clock of inside, the interface of adjusting backup path during interface inverting sends the time of descending frame head, and it is consistent that the descending frame head that the descending frame head that sends from the interface of backup path and interface from operating path are sent arrives time of ONU.
In another embodiment of the present invention, also can monitor the functional module interface of frame head synchronization module and backup path, acquisition sends descending frame head and receives time of two time points of up frame head and/or the time difference between two time points from the interface of backup path from the interface of operating path, wherein, described frame head synchronization module provides the synchronizing frame head of the interface of the interface of operating path and backup path.Provide two kinds to obtain the time method that sends descending frame head from the interface of operating path.This method is for adopting the method for synchronizing frame head, it is synchronous to make the functional module interface of the functional module interface of operating path and backup path send descending frame head by the frame head synchronization module, be that control module directly detects the time that unified down-going synchronous frame head obtains sending with interface from the master descending frame head, the descending frame head position of the interface of operating path, the time point of this descending frame head position can be noted by the high frequency clock of inside, the interface of adjusting backup path during interface inverting sends the time of descending frame head, and it is consistent that the descending frame head that the descending frame head that sends from the interface of backup path and interface from operating path are sent arrives time of ONU.
Top control can independently be finished on the controlled function entity; be that control module can be arranged on independently on the controlled function entity; centralized control to the functional module interface and the protection circuit functional module interface of a plurality of operating paths; adopt this mode can realize the centralized control of a plurality of line interface functional modules; the system call of being more convenient for; configuring maintenance and management; particularly the protection system of 1:N or x:N (x represents the natural number greater than 1, and N represents the natural number greater than 1) can reduce the control complexity.
Top control also can be finished on the functional module interface of the backup path with control module, and promptly control module can be arranged on the functional module interface of backup path, and this mode is more obvious for the protection advantage of 1:1, and protection is switched rapider.
For the functional module interface of adjusting backup path sends time of descending frame head, need to obtain the adjustment time, specifically comprise:
Control module detects the position of descending frame head of the functional module interface of operating path, as the descending frame head that sends of the functional module interface that receives operating path or when receiving the descending frame head reference signal that the frame head synchronization module sends, write down the time T 1 of this time point, concrete, this time point can be determined by inner high frequency clock.The functional module interface of backup path receives uplink frame, writes down the time T 2 of this time point when detecting up frame head, utilizes T1 and T2 to calculate the adjustment time T then, is example with a up-downgoing round trip cycle, and adjusting time T can obtain with following formula:
T＝T2-T1-2*Tf-Tr (1)
In the following formula (1), T2 represents that the functional module interface of backup path receives the time of up frame head, T1 represents that the functional module interface of operating path sends the time of descending frame head, Tf represents the frame length cycle (the frame length cycle as a frame among the GPON is 125 μ s) of a frame, and Tr is the response time of ONU.Wherein, Tf can determine that Tr can comprise following at least a: the wait time delay of the response time of ONU self, system requirements ONU and balanced time delay EQD etc. according to the frame length cycle of system protocol regulation.In order to simplify processing, the value of Tr can adopt an average to replace; But consider the particularity of ONU and circuit, can safeguard an information table, write down information such as the T2 of the time T r of each ONU and each ONU and T1, calculate the time T of each ONU according to information table.
According to top description, adjusting time T can obtain with following formula:
T＝ΔT-2*Tf-Tr (2)
In the following formula (2), Δ T=T2-T1 can obtain by timer, adopts this method can not need to know the concrete time of each time point, only need know the time between these two time points; Tf is identical with formula (1) with Tr, repeats no more.
It should be noted that following formula (1) and (2) are not limited only to the application in a up-downgoing cycle, can expand to the application in a plurality of up-downgoing cycles, in addition, the simple change in the formula, as add that error adjustment time etc. is all within protection scope of the present invention.
Because ONU has following several state: O1:ONU just powers on, and is in initial condition; O2:ONU waits for the network parameter state that receives; O3:ONU waits for the serial number request state that receives; O4: distance measuring states; O5: running status (normal state); O6:POPUP State (wait state); O7: urgent halted state.Not enter O6 (wait state) if ONU receives professional meeting from O5 (normal condition),, can enter O7: urgent halted state from O5 (normal condition) perhaps in particular case such as data conflict.In order to address the above problem, can send the frame head of downlink frame by the functional module interface of adjusting backup path, make that the descending frame head that sends from the interface of backup path is consistent with the time that arrives ONU from the main downlink frame that sends with interface, can not bring influence, specifically describe the time that the functional module interface of adjusting backup path sends descending frame head below professional reception of ONU:
For the adjustment time, also need determine to adjust direction, as described in receive the time of up frame head and from time of first interface transmission descending frame head from second interface; When the time ratio that receives up frame head from described second interface from time that first interface sends descending frame head during greater than predetermined value, need to determine in advance; When receiving the time of up frame head and, determine and to delay from second interface from time that first interface sends descending frame head during less than predetermined value from described.This predetermined value can be set as the case may be, and suc as formula (1) and (2), predetermined value can be made as 0; Wherein, if directly compare Δ T, then predetermined value is 2*Tf+Tr.
When the needs interface inverting, if the switching time of working line interface is T0, at this moment, the time that standby line interface sends descending frame head is adjusted into T0-T, if promptly adjust time T＞0, the time that the functional module interface of backup path is sent descending frame head shifts to an earlier date the T time and sends, if adjust time T＜0, the time of the functional module interface transmission descending frame head of backup path is delayed the T time send.Certainly, also can not knowing the switching time T0 of working line interface, for example utilize each frame to send the reference time point in cycle, is according to the adjustment time with this reference time point.
If adjust time T＞0, i.e. transmitting time point situation in advance, before execution is switched, will be earlier by backup traffic such as upper layer network or upper-layer service passages, the functional module interface in back-up job path is managed the information of ONU simultaneously, for example balanced time delay EQD etc.During masterslave switchover, the functional module interface in control module Control work path stops to send, the functional module interface of backup path is designated as the functional module interface of operating path, begins to open descending transmission, and the clock frame head of the transmitting time point that the use process is adjusted is as descending transmission frame head.
If adjust time T＜0, it is the situation that the transmitting time point is delayed, owing to the descending frame head that the interface from backup path sends has been delayed time T than the original descending frame head that sends from the interface of operating path, therefore to arrive the time of ONU consistent with the time that descending frame head that interface from operating path sends arrives ONU for the descending frame head that sends from the interface of backup path, the descending frame head of OLT does not change concerning ONU, ONU enters and re-registers and distance measuring states, saved a large amount of switching times, ONU does not roll off the production line simultaneously, to almost not influence of business.
In addition, for the time that makes the up frame head of ONU arrive the interface of the operating path after switching is satisfied standard-required, need the EQD on the ONU be upgraded, again the method for upgrading EQD is a lot, for example according to standard G.984., descendingly issue the order of upgrading EQD, EQD is adjusted into time of EQD-2T, the time that makes the up frame head of ONU arrive the interface of the operating path after switching is satisfied standard-required.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize based on such understanding by the mode that software adds necessary general hardware platform, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (11)
1, a kind of reverse method of multi-plexing light accessing system, the local side of described multi-plexing light accessing system comprise first interface and second interface, and described first interface is couple to operating path, and described second interface is couple to backup path, it is characterized in that, comprising:
Obtain from first interface and send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second interface;
According to the time difference between time of described two time points and/or two time points, obtain the adjustment time that sends descending frame head from second interface;
According to the time of described adjustment time adjustment, carry out from first interface switching to second interface from described second interface transmission descending frame head.
2, the method for claim 1 is characterized in that, described acquisition sends descending frame head and receives time of two time points of up frame head from second interface and/or the time difference between two time points comprises from first interface:
Monitor the functional module interface of first interface and the functional module interface of second interface, obtain to send descending frame head and to receive time of two time points of up frame head and/or the time difference between two time points from second interface from first interface; Or
The functional module interface of the monitoring frame head synchronization module and second interface, acquisition sends descending frame head and receives time of two time points of up frame head and/or the time difference between two time points from second interface from first interface, wherein, described frame head synchronization module provides the synchronizing frame head of first interface and second interface.
3, the method for claim 1 is characterized in that, described method further comprises:
More describedly receive the time of up frame head and send time of descending frame head from first interface from second interface;
When the time ratio that receives up frame head from described second interface from time that first interface sends descending frame head during greater than predetermined value, make to be adjusted to from the time that first interface sends descending frame head to shift to an earlier date the described adjustment time from the time that second interface sends descending frame head;
When receiving the time of up frame head and from time that first interface sends descending frame head during from second interface, the described time that sends descending frame head from second interface was adjusted to from the time that first interface sends descending frame head delays the described adjustment time less than predetermined value from described.
4, the method for claim 1 is characterized in that, described method further comprises:
To light user terminal transmission control frame, upgrade the balanced time delay EQD on the described ONU.
5, the method for claim 1 is characterized in that, described method further comprises:
The described adjustment time by described send descending frame head and receive time, the frame length cycle of two time points of up frame head, the response time of light user terminal from first interface from second interface determine; And/or
The described adjustment time was determined by the described response time that sends descending frame head and receive time difference between two time points of up frame head, frame length cycle, light user terminal from second interface from first interface.
6, a kind of optical line terminal is characterized in that, described optical line terminal comprises first functional module interface, second functional module interface and control module,
Described first functional module interface is used to provide the interface processing capacity of operating path;
Described second functional module interface is used to provide the interface processing capacity of backup path;
Described control module, being used to obtain described first functional module interface sends descending frame head and second functional module interface and receives time of two time points of up frame head and/or the time difference between two time points, according to the time difference between time of described two time points and/or two time points, obtain the adjustment time of second functional module interface transmission descending frame head, according to the time of described adjustment time adjustment, control of the switching of described first functional module interface to described second functional module interface from described second functional module interface transmission descending frame head.
7, optical line terminal as claimed in claim 6, it is characterized in that, described control module is by monitoring described first functional module interface and described second functional module interface, obtains described first functional module interface and sends descending frame head and second functional module interface and receive time of two time points of up frame head and/or the time difference between two time points.
8, optical line terminal as claimed in claim 6 is characterized in that, described optical line terminal also comprises the frame head synchronization module, is used to provide the synchronizing frame head of described first functional module interface and described second functional module interface,
Described control module is by monitoring frame head synchronization module and described second functional module interface, obtains described first functional module interface and sends descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second functional module interface.
9, optical line terminal as claimed in claim 6 is characterized in that, described optical line terminal also comprises update module, is used to upgrade the balanced time delay EQD on the described ONU, wherein, needs the balanced time delay EQD that upgrades to send to described ONU by downlink frame.
10, a kind of multi-plexing light accessing system, it is characterized in that, described multi-plexing light accessing system comprises optical line terminal and Optical Network Terminal, access path between described optical line terminal and the described Optical Network Terminal comprises operating path and backup path, described optical line terminal comprises first interface and second interface, described first interface couples operating path, and described second interface couples backup path
Described optical line terminal, be used to obtain from first interface and send descending frame head and receive time of two time points of up frame head and/or the time difference between two time points from second interface, according to the time difference between time of described two time points and/or two time points, obtain the adjustment time that sends descending frame head from second interface; Send the time of the adjustment time adjustment of descending frame head according to described interface, carry out switching from the operating path to the backup path from described second interface transmission descending frame head from backup path.
11, a kind of control device of switching is characterized in that, switches control device and comprises: adjust time acquisition unit, adjust time acquisition unit, adjustment unit, switch control unit; The described control device of switching also comprises the very first time acquiring unit and/or second time acquisition unit; Wherein,
Described very first time acquiring unit is used to obtain from the interface of operating path and sends descending frame head and receive time of two time points of up frame head from the interface of backup path;
Described second time acquisition unit is used to obtain from the interface of operating path and sends descending frame head and receive time between two time points of up frame head from the interface of backup path;
Described adjustment time acquisition unit is used for the adjustment time between the interface of the interface in the time difference evaluation work path that time of obtaining according to described very first time acquiring unit and/or described second time acquisition unit obtain and backup path; Described adjustment unit, the adjustment time that is used for obtaining according to described adjustment time acquisition unit is adjusted the time that sends descending frame head from the interface of backup path;
Switch control unit, be used for after the adjustment unit adjustment sends the time of descending frame head from the interface of backup path, the interface in Control work path is switched to the interface of backup path.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810126402A CN101615927A (en) | 2008-06-25 | 2008-06-25 | A kind of reverse method of multi-plexing light accessing system, device and system |
| PCT/CN2009/072291 WO2009155830A1 (en) | 2008-06-25 | 2009-06-16 | Exchanging method, equipment and system for the optical access system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810126402A CN101615927A (en) | 2008-06-25 | 2008-06-25 | A kind of reverse method of multi-plexing light accessing system, device and system |
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| CN101615927A true CN101615927A (en) | 2009-12-30 |
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| CN200810126402A Pending CN101615927A (en) | 2008-06-25 | 2008-06-25 | A kind of reverse method of multi-plexing light accessing system, device and system |
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| WO (1) | WO2009155830A1 (en) |
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| CN103248418A (en) * | 2012-02-06 | 2013-08-14 | 中兴通讯股份有限公司 | Method and system used for switching main channel and spare channel and based on PON (passive optical network) |
| CN105763381A (en) * | 2016-04-14 | 2016-07-13 | 烽火通信科技股份有限公司 | Lossless processing method and system of main-standby switching messages |
| WO2019006704A1 (en) * | 2017-07-05 | 2019-01-10 | 华为技术有限公司 | Path computation method, apparatus and system |
| CN111654297A (en) * | 2017-08-30 | 2020-09-11 | 华为技术有限公司 | Dynamic time adjustment method, device and system |
| CN111866624A (en) * | 2020-06-16 | 2020-10-30 | 烽火通信科技股份有限公司 | ONU service migration method, device, equipment and readable storage medium |
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| CN114500165B (en) * | 2020-11-12 | 2023-05-12 | 中国联合网络通信集团有限公司 | Communication method, local side equipment and storage medium |
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| CN101150361B (en) * | 2006-09-20 | 2011-06-22 | 北京格林威尔科技发展有限公司 | A method and system for realizing fully protective switching in passive optical network |
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- 2009-06-16 WO PCT/CN2009/072291 patent/WO2009155830A1/en active Application Filing
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| CN105763381A (en) * | 2016-04-14 | 2016-07-13 | 烽火通信科技股份有限公司 | Lossless processing method and system of main-standby switching messages |
| WO2019006704A1 (en) * | 2017-07-05 | 2019-01-10 | 华为技术有限公司 | Path computation method, apparatus and system |
| CN111654297A (en) * | 2017-08-30 | 2020-09-11 | 华为技术有限公司 | Dynamic time adjustment method, device and system |
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| CN111866624A (en) * | 2020-06-16 | 2020-10-30 | 烽火通信科技股份有限公司 | ONU service migration method, device, equipment and readable storage medium |
| CN111866624B (en) * | 2020-06-16 | 2022-09-02 | 烽火通信科技股份有限公司 | ONU (optical network Unit) service migration method, device and equipment and readable storage medium |
| WO2021259216A1 (en) * | 2020-06-23 | 2021-12-30 | 中兴通讯股份有限公司 | Authentication method, apparatus and device, and storage medium |
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