CN101557539A - Optical network data transmission method as well as system and equipment thereof - Google Patents
Optical network data transmission method as well as system and equipment thereof Download PDFInfo
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- CN101557539A CN101557539A CNA2008100919491A CN200810091949A CN101557539A CN 101557539 A CN101557539 A CN 101557539A CN A2008100919491 A CNA2008100919491 A CN A2008100919491A CN 200810091949 A CN200810091949 A CN 200810091949A CN 101557539 A CN101557539 A CN 101557539A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0652—Synchronisation among time division multiple access [TDMA] nodes, e.g. time triggered protocol [TTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
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Abstract
The invention discloses an optical network data transmission method as well as a system and equipment thereof, belonging to the field of optical communication. The method comprises the steps of obtaining the respective first roundtrip delay Rtd value of ONU; obtaining the second roundtrip delay Rtd value of distance measurement ONU; obtaining the change value of the Rtd value according to the first Rtd value and the second Rtd value of the distance measurement ONU; obtaining the second Rtd value of non-distance-measurement ONU according to the change value and the first Rtd value of the non-distance-measurement ONU; and obtaining and transmitting the corresponding isostatic delay EqD value of the ONU according to the obtained respective second Rtd value of the ONU. The system comprises transmission equipment, distance measurement equipment and non-distance-measurement equipment. The equipment comprises an obtaining module, a distance measurement module, a difference value module, a processing module and a transmission module. When the phenomena of main optical fiber faults or main OLT equipment faults, and the like occur in a PON network, main and standby conversion is triggered and performed. The invention only needs to perform distance measurement for one ONU, so the distance measurement time is saved. Especially when a plurality of ONUs exist, the invention can obviously reduce service interruption and meet the requirements of service which is carried by the PON network and has higher time delay requirements.
Description
Technical field
The present invention relates to optical communication field, particularly a kind of method of optical network data transmission, system and equipment.
Background technology
In present optical communication technique field, PON (passive optical network, EPON) technology is widely used as a kind of light access technology of point-to-multipoint mode, and referring to Fig. 1, the PON network is by OLT (Optical LineTerminal; Optical line terminal), OS (Optical Splitter, optical branching device) and ONU (Optical Network Unit, optical network unit) constitute, OLT is as local side apparatus, be connected with OS by a trunk optical fiber, OS connects each ONU by independent branch optical fiber; Wherein, down direction (transmission of 1490 nano wave length bearer services is adopted in the transmission direction of OLT to ONU usually), OS realizes the beam split function, by branch optical fiber the downlink optical signal of OLT is sent to all ONU; Up direction (transmission of 1310 nano wave length bearer services is adopted in the transmission direction of ONU to OLT usually), OS realizes the light signal aggregation feature, after the light signal that all ONU are sent converges, sends to OLT by trunk optical fiber.
Traditional optical branching device OS just realizes the beam split of light signal and converges do not have the enlarging function of light signal, therefore is called EPON.Because light signal transmits in optical fiber decay is arranged, in order to support the long-range data transmission of OLT and ONU, just need the light signal in the optical fiber be amplified, therefore just need on optical transmission pathway, increase power amplifier.Having increased in original PON network just becomes active point-to-multipoint Optical Access Network behind the power amplifier.For convenience of description, this paper back comprises active situation to the description of PON network.
Transmission collision for fear of a plurality of ONU light signals of up direction, need be under the control of OLT, guaranteeing can only be by a up transmission light signal of ONU in the same moment, and, guarantee that the time of the light signal arrival OLT that all ONU send is identical in order to guarantee synchronism to each ONU Business Processing.
Wherein, GPON (Gigabit Passive Optical Network, gigabit passive optical network) as the mainstream applications technology of PON network, has formulated the GPON standard.In this standard in order to guarantee that the time that light signal that all ONU send arrives OLT is identical, ONU is when OLT sends upstream data, the needs basis is different with the OLT distance, correspondingly sending the slow different time of data delay, this transmission lag time is called EqD (the balanced time delay of Equalization delay), and this EqD value is obtained in the following manner:
OLT handles by ONUn is carried out range finding, obtains Rtd (Round trip delay, the roundtrip delay) value of OLT to this ONU, calculates the EqD value of this ONU then by the Rtd value, and the EqD that calculating is obtained is sent among this ONU; ONU receives the delay time setting of finishing self behind the EqD.Wherein, when calculating the EqD value of this ONU by the Rtd value, concrete reference formula is as follows:
EqD (n)=Teqd-Rtd (n); Wherein, Teqd is balanced roundtrip delay (Equalized round trip delay), and value is a constant value.
And; the PON network can provide active and standby OLT protection switch function; by being the main mode that standby OLT is provided with OLT; guarantee that the PON network can continue to provide professional when OLT fault or trunk optical fiber fault; detecting mainly, switching to standby PON LT module and standby trunk optical fiber and continue to finish the purpose of communicating by letter with ONU, thereby guarantee that the PON network still can continue to provide professional with PON LT module failure or main during with the trunk optical fiber fault.
When the PON network occurs because trunk optical fiber fault (or OLT fault), and when carrying out masterslave switchover, because, the active and standby different difference of length with trunk optical fiber, the EqD value of switching back ONU also can be different, and the active and standby switching new master in back need find range again to all ONU with OLT new EqD is set.The trunk optical fiber fault to occur is example, again Ce Ju process is as follows: the active and standby new main OLT of using in back that switches is to all ONU broadcast transmission POPUP message, notice ONU is the RANGING state by the POPUP state exchange, and (range measurement principle is same as above) handled in the range finding that begins all ONU.Because it is serial that the range finding of ONU is handled, OLT finishes the range finding of previous ONU and handles, and the range finding that just begins next ONU is handled.After the ONU range finding was finished, the business transmission between ONU and the OLT recovered.Therefore, the service outage duration that causes of trunk optical fiber fault is:
Service outage duration=LOS detection time+switch decision-making time of implementation+N * ONU to find range the time; Wherein, N is the ONU number that a PON LT inserts down.
The inventor finds when realization is of the present invention, the formula of the service outage duration that causes according to above-mentioned trunk optical fiber fault as can be seen, wherein, the time that ONU finds range is again directly restricting service outage duration, because usually in the GPON standard, the range finding time of each ONU probably about 1ms, the number of the ONU that PON LT inserts down many more, take place active and standby OLT switch break period of back bearer service will be long more.Dilatation is the inexorable trend of PON networks development, along with rolling up of the number of the ONU that inserts PON, when when the process need of service operation is found range again (as the appearance of the situation of above-mentioned masterslave switchover), as the method for the distance of resurveying that provides in the existing standard still is provided, for those service delay require is wanted high business, as TDM (Time Division Multiplex, time division multiplexing) voice service, video traffic or the like can't satisfy its delay requirement.For example, when certain business need is during less than 50ms its professional break period, if a PON LT inserts 128 ONU or more down, can't guarantee professional continuity, cause professional interruption, cause to the user and bring relatively poor user experience, reduce the user provides service to operator satisfaction.
Summary of the invention
When carrying out masterslave switchover for the OLT that guarantees at the PON network, guarantee the continuity of the business that provides, reduce service outage duration, satisfy professional delay requirement, the embodiment of the invention provides a kind of method, system and equipment of optical network data transmission.Described technical scheme is as follows:
On the one hand, provide a kind of method of optical network data transmission, optical network unit ONU is a plurality of, and described method comprises:
Obtain the described ONU first roundtrip delay Rtd value separately;
From described ONU, select range finding ONU, obtain the second roundtrip delay Rtd value of described range finding ONU;
According to a Rtd value and the 2nd Rtd value of described range finding ONU, obtain the changing value of Rtd value;
According to the Rtd value of described changing value and non-range finding ONU, obtain the 2nd Rtd value of described non-range finding ONU;
According to the described ONU that obtains the 2nd Rtd value separately, obtain and send the isostatic lag EqD value of described ONU correspondence.
On the other hand, provide a kind of system of optical network data transmission, described system comprises: transmitting apparatus, distance-measuring equipment, non-distance-measuring equipment, wherein,
Described transmitting apparatus is used to obtain the first roundtrip delay Rtd value of described distance-measuring equipment and described non-distance-measuring equipment; Also be used for sending distance measurement request, obtain the second roundtrip delay Rtd value of described distance-measuring equipment according to the ranging response of described distance-measuring equipment to described distance-measuring equipment; According to a Rtd value and the 2nd Rtd value of described distance-measuring equipment, obtain the changing value of Rtd value; After getting access to described changing value,, obtain the 2nd Rtd value of described non-distance-measuring equipment according to a Rtd value of described changing value and described non-distance-measuring equipment; According to the 2nd Rtd value of the described distance-measuring equipment that obtains and the 2nd Rtd value of described non-distance-measuring equipment, obtain and send the isostatic lag EqD value of described distance-measuring equipment and described non-distance-measuring equipment respectively;
Described distance-measuring equipment is used to receive the distance measurement request that described transmitting apparatus sends, and returns ranging response to described transmitting apparatus; Also be used to receive the isostatic lag EqD value that described transmitting apparatus sends.
Described non-distance-measuring equipment is used to receive the isostatic lag EqD value that described transmitting apparatus sends.
Again on the one hand, provide a kind of equipment of optical network data transmission, described equipment comprises:
Acquisition module is used to obtain the first roundtrip delay Rtd value of distance-measuring equipment and non-distance-measuring equipment;
Range finder module is used for sending distance measurement request to described distance-measuring equipment, obtains the second roundtrip delay Rtd value of described distance-measuring equipment according to the ranging response of described distance-measuring equipment;
Difference block is used for a Rtd value of the distance-measuring equipment that obtains according to described acquisition module and the 2nd Rtd value of the described distance-measuring equipment that described range finder module obtains, and obtains the changing value of Rtd value;
Processing module is used for a Rtd value of the non-distance-measuring equipment that the changing value that obtains according to described difference block and described acquisition module obtain, and obtains the 2nd Rtd value of described non-distance-measuring equipment;
Sending module is used for the 2nd Rtd value of the described distance-measuring equipment that obtains according to described range finder module and the 2nd Rtd value of the non-distance-measuring equipment that described processing module is obtained, and obtains and send the isostatic lag EqD value of described distance-measuring equipment and described non-distance-measuring equipment.
Again on the one hand, also provide a kind of system of optical network data transmission, described system comprises: optical line terminal OLT, range finding optical network unit ONU and non-range finding optical network unit ONU;
Described OLT is used to obtain the first roundtrip delay Rtd value of described range finding ONU and described non-range finding ONU; Also be used for sending distance measurement request, obtain the second roundtrip delay Rtd value of described range finding ONU according to the ranging response of described range finding ONU to described range finding ONU; According to a Rtd value and the 2nd Rtd value of described range finding ONU, obtain the changing value of Rtd value; After getting access to described changing value,, obtain the 2nd Rtd value of described non-range finding ONU according to the Rtd value of described changing value and described non-range finding ONU; According to the 2nd Rtd value of the described range finding ONU that obtains and the 2nd Rtd value of described non-range finding ONU, obtain and send the isostatic lag EqD value of described range finding ONU and described non-range finding ONU respectively;
Described range finding ONU is used to receive the distance measurement request that described OLT sends, and returns ranging response to described OLT; Also be used to receive the isostatic lag EqD value that described OLT sends.
Described non-range finding ONU is used to receive the isostatic lag EqD value that described OLT sends.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
Carry out masterslave switchover when triggering after the master uses the OLT equipment fault with fiber failure or master appears in the PON network, when spare OLT is being carried out ranging process and is being handled, by an execution range operation to an ONU, promptly only the find range Rtd value of an ONU, obtain the difference of the active and standby Rtd of this ONU according to the Rtd value, then according to the difference of the active and standby Rtd of this ONU and the Rtd value on former main OLT, calculate the EqD value on the new OLT, the EqD that finishes ONU is set then, thereby saved the time of range finding, particularly work as the ONU number more for a long time, the method of utilizing the embodiment of the invention to provide can reduce a large number of services break period, the continuity of the business that provides has been provided, and then has satisfied the requirement to the higher TDM business of delay requirement of the PON network carrying.
Description of drawings
Fig. 1 is the PON network architecture schematic diagram that prior art provides;
Fig. 2 is the schematic diagram of a kind of masterslave switchover of providing of the embodiment of the invention 1;
Fig. 3 is the flow chart of the method for the optical network data transmission that provides of the embodiment of the invention 1;
Fig. 4 is the information interaction schematic diagram of the method for the optical network data transmission that provides of the embodiment of the invention 1;
Fig. 5 is the system schematic of the optical network data transmission that provides of the embodiment of the invention 2;
Fig. 6 is the concrete schematic diagram of system of the optical network data transmission that provides of the embodiment of the invention 2;
Fig. 7 is the equipment schematic diagram of the optical network data transmission that provides of the embodiment of the invention 3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention provides a kind of method of optical network data transmission, and method thes contents are as follows: obtain the ONU first roundtrip delay Rtd value separately; From ONU, select range finding ONU, obtain the second roundtrip delay Rtd value of range finding ONU; According to a Rtd value and the 2nd Rtd value of range finding ONU, obtain the changing value of Rtd value; According to the Rtd value of changing value and non-range finding ONU, obtain the 2nd Rtd value of non-range finding ONU; According to the ONU that obtains the 2nd Rtd value separately, obtain and send the isostatic lag EqD value of ONU correspondence.
Wherein, the step of obtaining the second roundtrip delay Rtd value of range finding ONU also comprises: according to the 2nd Rtd value, obtain and send the isostatic lag EqD value of range finding ONU;
Correspondingly,, obtain and send the step of the isostatic lag EqD value of ONU correspondence, be specially according to the ONU that obtains the 2nd Rtd value separately:
According to the 2nd Rtd value separately of the non-range finding ONU that obtains, obtain and send the isostatic lag EqD of non-range finding ONU correspondence.
Wherein, especially, under the prerequisite of the delay requirement that guarantees system, for the accuracy that guarantees to calculate, wherein, range finding ONU can also be for a plurality of; Correspondingly, from ONU, select range finding ONU in the method for the optical network data transmission that the embodiment of the invention provides accordingly, obtain the second roundtrip delay Rtd value of range finding ONU, according to a Rtd value and the 2nd Rtd value of range finding ONU, the step of obtaining the changing value of Rtd value is specially:
From ONU, select a plurality of range finding ONU, obtain the second roundtrip delay Rtd value of a plurality of range finding ONU successively;
According to a range finding ONU Rtd value and the 2nd Rtd value separately, get access to the Rtd value separately of range finding ONU and the difference of the 2nd Rtd value respectively; A plurality of differences are got the changing value that average is obtained the Rtd value.
And the above-mentioned step of obtaining the second roundtrip delay Rtd value of a plurality of range finding ONU successively is specially:
Obtain the second roundtrip delay Rtd value of current range finding ONU, obtain and send the isostatic lag EqD value of current range finding ONU according to the 2nd Rtd value of current range finding ONU;
Obtain the second roundtrip delay Rtd value of the next one range finding ONU of current range finding ONU, obtain and send the isostatic lag EqD value of next range finding ONU according to the second roundtrip delay Rtd value of next one range finding ONU;
Up to obtain and send finish all the range finding ONU isostatic lag EqD.
So, correspondingly,, obtain and send the step of the isostatic lag EqD value of ONU correspondence according to the ONU that obtains the 2nd Rtd value separately, be specially:
According to the 2nd Rtd value separately of the non-range finding ONU that obtains, obtain and send the isostatic lag EqD value of non-range finding ONU correspondence.
In the method for the optical network data transmission that the embodiment of the invention provides, when obtaining separately the first roundtrip delay Rtd value of ONU, can realize by obtaining the main ONU that sends with the optical line terminal first roundtrip delay Rtd value separately, also can realization be set by the configuration of system in advance.
The method of utilizing the invention described above embodiment to provide, when trunk optical fiber fault or main with OLT fault execution masterslave switchover appears in the PON network, carry out in the ranging process in spare OLT, by an execution range operation to an ONU, promptly only the find range Rtd value of an ONU, obtain the difference DELTA of the active and standby Rtd of this ONU according to this Rtd value, then according to the Rtd value on the main OLT of this difference DELTA and all the other each ONU, calculating gets access to the EqD value of each ONU on spare OLT, each EqD value that will get access to by message is issued among each self-corresponding ONU at last, owing to only need an ONU among all ONU that insert is carried out range operation, can recover professional transmission, thereby save the time of a large amount of range finding of knowing clearly, particularly when the number of the ONU that inserts is big, the method of utilizing the embodiment of the invention to provide can reduce a large number of services break period, and then satisfies the requirement to the higher TDM business of delay requirement of the PON network carrying.The description of the technical scheme that the embodiment of the invention provides sees following specific embodiment for details.
When the trunk optical fiber at main OLT in the PON network broke down (perhaps main OLT breaks down), the PON network need carry out masterslave switchover, and data are switched on the spare OLT.Present embodiment is that example describes with the schematic diagram of the masterslave switchover that Fig. 2 provides, in the process that active and standby OLT switches, because main length with trunk optical fiber and standby trunk optical fiber is isoparametric different, the just new master of spare OLT is with the OLT processing of need finding range again to the ONU that inserts.For the ONU that reduces all accesses carries out the range finding processing needed range finding time, reduce service outage duration, the embodiment of the invention provides a kind of method of optical network data transmission.Referring to Fig. 3, breaking down and need carry out masterslave switchover with main trunk optical fiber with OLT in the present embodiment is that example describes, and this method thes contents are as follows:
101: the master detects dropout LOS (Lost Of Signal) alarm with OLT, triggers and carries out the switching of active and standby OLT; Former master is changed spare OLT into OLT, and former spare OLT changes into new main with OLT (hereinafter for convenience of description, before the business transmission recovers, will new master being called spare OLT with OLT).Each ONU detects the LOS alarm, enters the POPUP state.
Wherein, after main trunk optical fiber with OLT breaks down, since main with OLT and each ONU owing to the signal that does not receive the other side, the capital detects dropout LOS alarm, the master detects the LOS alarm with OLT, know to occur mainly use the trunk optical fiber fault, need carry out active and standby OLT and switch: the data flow of the ONU that inserts is switched on the spare OLT, and the standby trunk optical fiber that utilizes spare OLT to provide communicates with each ONU; When each ONU Equipment Inspection after LOS alarm, switch to the POPUP state of hanging up by the OPERATION state of operate as normal.At this moment, the transmission of the business of spare OLT and each ONU is in interrupt status.
102; Lead the parameter of each ONU that will preserve with OLT, send to spare OLT by communication link, spare OLT is obtained the parameter of each ONU.
Wherein, spare OLT is obtained each ONU parameter in this step 102, can occur in after the step 101, also can be to occur in any time before the step 101 (when for example carrying out the PON system deployment, the parameter of each ONU of inserting is configured in active and standby OLT respectively prestores.This inventive embodiments does not limit the concrete mode and time of parameter that spare OLT gets access to each ONU of access, but will guarantee that spare OLT has successfully got access to the parameter of each ONU of access before step 106 is carried out.
Wherein, the parameter of each ONU comprises: the roundtrip delay Rtd value of the main ONU that obtains with OLT, respectively insert the numerical value such as sign of ONU.Wherein, Rtd=ONU processing delay value+branch optical fiber propagation delay value+trunk optical fiber propagation delay value+OLT processing delay value.For the ease of explaining the main Rtd that the Rtd value of leading the ONU that obtains with OLT can be called ONUi, be expressed as Rtd (master)
ONUi(wherein,
ONUiI ONU among the ONU that expression inserts).
103: spare OLT is selected range finding ONU from each ONU that inserts, and ONU carries out range finding to this range finding.
Wherein, because under this PON network, not only one of the number of the ONU that inserts, and dilatation along with the capacity of OPN network, its number that inserts ONU equipment is with a large amount of increases, standby OLT can therefrom select one arbitrarily as the ONU that finds range and handle when the selection of the ONU that finds range, a certain ONU among each ONU that can also insert according to default rule appointment is as range finding ONU.The embodiment of the invention is not limited in concrete mode and the rule of selecting range finding ONU.
104: spare OLT sends distance measurement request Range Request message to this range finding ONU.
105: after range finding ONU receives distance measurement request Range Request message, return ranging response RangeResponse message to spare OLT.
Wherein because range finding ONU was in the POPUP state before receiving the distance measurement request Range Request message that spare OLT sends, after receiving this distance measurement request Range Request message, by the POPUP state exchange to the RANGING distance measuring states.
106: after spare OLT is received the ranging response Range Response message returned of range finding ONU, obtain the roundtrip delay Rtd value of this range finding ONU.
Wherein, spare OLT is according to receiving the range finding ranging response Range Response message returned of ONU and to this range finding ONU transmission distance measurement request Range Request message, according to the time interval, obtaining the roundtrip delay Rtd value of this range finding ONU.
107: spare OLT is obtained active and standby trunk optical fiber propagation delay difference DELTA according to the Rtd value of the range finding ONU that obtains and the main roundtrip delay Rtd value (i.e. Rtd (master) value of this range finding ONU equipment) with OLT of this range finding ONU.
Wherein, the main roundtrip delay Rtd value with OLT of this range finding ONU is specially in step 101, and lead with OLT and send to spare OLT by communication link, perhaps, when carrying out the OPN network design, in the setting of spare OLT deploy.
For the ease of statement, correspondingly, the Rtd value representation of the range finding ONU that spare OLT is obtained is Rtd (being equipped with), as described in the step 102, the Rtd value of ONU equipment specifically is by ONU processing delay value, branch optical fiber propagation delay value, trunk optical fiber propagation delay value, OLT processing delay value is formed, owing to ONU that the trunk optical fiber fault causes is taking place from main when switching to spare OLT equipment with OLT equipment, it is being led, be equipped with the ONU processing delay value in the Rtd value on the OLT equipment, branch optical fiber propagation delay value, OLT processing delay value remains unchanged, and unique change is because main, the trunk optical fiber propagation delay value that the difference of the trunk optical fiber length that is equipped with causes changes.Therefore, the difference of the Rtd value of ONU on active and standby OLT is specially active and standby trunk optical fiber propagation delay difference DELTA, that is: Rtd (master)-Rtd (being equipped with)=Δ.
108: spare OLT is calculated Rtd (being equipped with) value of obtaining each ONU equipment according to Rtd (master) value of other each ONU that obtains active and standby trunk optical fiber propagation delay difference DELTA and prestore.
Wherein, the obtain manner of the Rtd of each ONU of other that on spare OLT, prestores (master) value, identical with the obtain manner of Rtd (master) value of the range finding ONU that in step 107, obtains, be specially: main send to spare OLT by communication link with OLT, perhaps, when carrying out the OPN network design, be provided with in the spare OLT deploy.
Because the difference of active and standby trunk optical fiber length is fixed, for as all ONU active and standby PON LT under, shared simultaneously trunk optical fiber, so all ONU also fix in the difference DELTA of the propagation delay value of active and standby trunk optical fiber section, that is:
Δ=Rtd (master)
ONU1-Rtd (being equipped with)
ONU1=Rtd (master)
ONU2-Rtd (being equipped with)
ONU2=...=Rtd (master)
ONUn-Rtd (being equipped with)
ONUn
Therefore, the spare OLT range finding gets access to the active and standby trunk optical fiber propagation delay difference DELTA of an ONU, then can be worth according to other the Rtd (master) of ONU that preserves, the difference DELTA that utilization is obtained, the Rtd (master) of ONU to other compensates, thereby gets access to the Rtd (being equipped with) of other ONU accordingly.That is:
Rtd (being equipped with)
ONUi=Rtd (master)
ONUi-Δ.
109: spare OLT gets access to the isostatic lag time EqD (being equipped with) of each ONU according to the Rtd (being equipped with) of each ONU that obtains.
At the Rtd (being equipped with) according to each ONU that obtains, the isostatic lag time EqD that gets access to each ONU is when (being equipped with), and concrete reference formula is:
EqD
ONUi=Teqd (being equipped with)-Rtd
ONUi=Teqd-(Rtd (master)
ONUi-Δ), wherein, Teqd (being equipped with) value is a constant value, its value can and Teqd (master) identical or different.
110: spare OLT issues the EqD (being equipped with) of each ONU that obtains by Ranging Time PLOAM message.
Wherein, pass through Ranging Time PLOAM message at spare OLT equipment, the EqD that issues each ONU that obtains is when (being equipped with), when specific implementation, can adopt the form of broadcasting to issue, can adopt the form of clean culture to issue, the embodiment of the invention does not limit the concrete mode that sends Ranging Time PLOAM message yet.
After receiving the Ranging Time PLOAM message that sends from spare OLT as each ONU, carry out delay time setting according to the EqD that wherein carries (being equipped with), and trigger the OPERATION state that enters separately, the transmission of recovery interrupted service.So far, spare OLT is finished the range finding to all ONU, has realized the quick switching of active and standby trunk optical fiber.
Further, the correctness in order to ensure sending can also be provided with the number of times that spare OLT issues Ranging Time PLOAM message, as issues 3 inferior.
Especially, at range finding ONU, spare OLT can also get access in step 106 in the roundtrip delay Rtd value of this range finding ONU, calculate the EqD value that gets access to this range finding ONU equipment according to this Rtd value, any time after step 106 then, spare OLT can be passed through Ranging Time PLOAM message, the EqD (being equipped with) of this range finding ONU is handed down to this range finding ONU equipment, referring to Fig. 4, the embodiment of the invention provides the information interaction schematic diagram that sends the method for data, as shown in the figure, the process of this information interaction is as follows:
1. occur mainly use the trunk optical fiber fault, carry out active and standby handover operation, detect the LOS alarm after, spare OLT switches to lead uses OLT; The master because detect the LOS alarm, is a POPUP state by normal OPEARATION state exchange with each ONU under the OLT, professional transmission interruption between OLT and the ONU.
2. spare OLT selects an ONU to carry out the range finding processing, and after range finding was finished, this range finding ONU was the OPERATION state by the RANGING state exchange, and the interrupting service of this range finding ONU recovers.
3. spare OLT obtains active and standby trunk optical fiber propagation delay difference DELTA according to range finding ONU range finding processing.According to this Δ value of obtaining and main, calculate the EqD on spare OLT (n) value of residue ONU with the Rtd on the OLT (n) value.
4. spare OLT is provided with new EqD (n) to other ONU, and correspondingly, ONU changes into the OPERATION state by the POPUP state, and interrupting service recovers.
Shown in Figure 4 as above-mentioned mutual signal, can set ONU at the POPUP state, if receive the distance measurement request Rangingrequest message of OLT, be the RANGING state promptly by the POPUP state exchange, begin range finding and handle.Set ONU at the POPUP state, if receive OLT the Ranging time PLOAM message of ONU EqD value is set, ONU is provided with new EqD value according to message, is normal OPERATION state by the POPUP state exchange promptly, recovers the interrupted service transmission.
The invention described above embodiment, it is the explanation that example is carried out that the number of the range finding ONU that obtains with spare OLT is one, especially, when specific implementation, the PON network can be determined the number as range finding ONU as required under the prerequisite that satisfies the service delay requirement, successively the range finding of range finding ONU is handled, obtain the mean value of this difference DELTA according to the active and standby Rtd difference DELTA of the ONU that respectively finds range that obtains then, thereby guaranteed the accuracy of calculating.
The invention described above embodiment is the explanation that example is carried out to lead with trunk optical fiber fault triggering masterslave switchover in the PON network, and in like manner, owing to lead the situation of carrying out masterslave switchover with the PON network of triggerings such as OLT fault, processing method is similar, repeats no more.
In sum, the method of the optical network data transmission that the embodiment of the invention provides, in the PON network, because the active and standby OLT that the trunk optical fiber fault causes switches, spare OLT does not need all ONU are found range again, the Rtd value that only needs one of them ONU of range finding, leading with the Rtd value on the OLT according to ONU, just can obtain the difference DELTA of active and standby Rtd, no longer needing to carry out range finding for other ONU that insert handles, according to the difference DELTA of obtaining and other ONU former master with the Rtd value on the OLT, just can calculate the EqD value on the spare OLT of other ONU correspondence, handle, just can recover professional transmission owing to only need to carry out once range finding, saved greatly all ONU carried out the spent time of range finding, satisfied PON network carrying business the time postpone requirement.
Embodiment 2
In the PON network, because the active and standby OLT that trunk optical fiber fault etc. causes switches, because the isoparametric difference of active and standby trunk optical fiber length, each ONU need obtain new EqD value again, referring to Fig. 5, the embodiment of the invention provides a kind of system of optical network data transmission, and this system comprises: transmitting apparatus, distance-measuring equipment, non-distance-measuring equipment, wherein
Transmitting apparatus is used to obtain the first roundtrip delay Rtd value of distance-measuring equipment and non-distance-measuring equipment; Also be used for sending distance measurement request, obtain the second roundtrip delay Rtd value of distance-measuring equipment according to the ranging response of distance-measuring equipment to distance-measuring equipment; According to a Rtd value and the 2nd Rtd value of distance-measuring equipment, obtain the changing value of Rtd value; After getting access to changing value,, obtain the 2nd Rtd value of non-distance-measuring equipment according to a Rtd value of changing value and non-distance-measuring equipment; According to the 2nd Rtd value of the distance-measuring equipment that obtains and the 2nd Rtd value of non-distance-measuring equipment, obtain and send the isostatic lag EqD value of distance-measuring equipment and non-distance-measuring equipment respectively;
Distance-measuring equipment is used to receive the distance measurement request that transmitting apparatus sends, and returns ranging response to transmitting apparatus; Also be used to receive the isostatic lag EqD value that transmitting apparatus sends.
Non-distance-measuring equipment is used to receive the isostatic lag EqD value that transmitting apparatus sends.
Wherein, transmitting apparatus also is used for repeatedly obtaining the second roundtrip delay Rtd value of distance-measuring equipment, and Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to distance-measuring equipment, and distance-measuring equipment is one or more.
Wherein, distance-measuring equipment is a plurality of, and correspondingly, transmitting apparatus comprises:
Acquisition module is used to obtain the first roundtrip delay Rtd value of distance-measuring equipment and non-distance-measuring equipment;
Range finder module is used for obtaining successively the second roundtrip delay Rtd value of a plurality of distance-measuring equipments;
Difference block is used for respectively the 2nd Rtd value of the distance-measuring equipment that obtains according to range finder module and the distance-measuring equipment Rtd value separately that acquisition module obtains, get access to distance-measuring equipment separately a Rtd value and the difference of the 2nd Rtd value; A plurality of differences are got the changing value that average is obtained the Rtd value;
Processing module is used for a Rtd value of the non-distance-measuring equipment that the changing value that obtains according to difference block and acquisition module obtain, and obtains the 2nd Rtd value of non-distance-measuring equipment; According to the 2nd Rtd value of the distance-measuring equipment that obtains and the 2nd Rtd value of non-distance-measuring equipment, obtain and send the isostatic lag EqD value of distance-measuring equipment and non-distance-measuring equipment respectively.
Further, system also comprises:
Equipment is provided, is used for providing the first roundtrip delay Rtd value of distance-measuring equipment and non-distance-measuring equipment to transmitting apparatus.
In order to describe in detail, when the system that the embodiment of the invention provides uses in the actual light network, referring to Fig. 6, wherein, transmitting apparatus is embodied as that spare OLT, distance-measuring equipment are embodied as range finding ONU, non-distance-measuring equipment is presented as non-range finding ONU, correspondingly, wherein
Spare OLT is used to obtain the roundtrip delay Rtd value (can be called a Rtd value) of the master of range finding ONU and non-range finding ONU with trunk optical fiber; ONU sends distance measurement request to range finding, obtains the roundtrip delay Rtd value (be standby trunk optical fiber correspondence, can be called the 2nd Rtd value) of this range finding ONU according to the ranging response of range finding ONU); According to the main Rtd value of the correspondence of this range finding ONU, get access to the Rtd of standby trunk optical fiber correspondence of this range finding ONU and the difference DELTA (i.e. the changing value of a Rtd value and the 2nd Rtd value) that the master uses the Rtd value of trunk optical fiber correspondence with trunk optical fiber; According to the main Rtd value with trunk optical fiber correspondence of difference DELTA, get access to the Rtd value of the standby trunk optical fiber correspondence of non-range finding ONU with the non-range finding ONU that obtains; Then, according to the Rtd value of the standby trunk optical fiber correspondence of distance-measuring equipment that obtains and non-distance-measuring equipment, obtain and send the isostatic lag EqD value of distance-measuring equipment and non-distance-measuring equipment correspondence;
Range finding ONU is used to receive the distance measurement request that spare OLT sends, and returns ranging response to spare OLT; And be used to receive the isostatic lag EqD value that spare OLT sends, utilize the EqD value of obtaining to finish the setting of self then.
Non-range finding ONU is used to receive the isostatic lag EqD that spare OLT sends, and utilizes the EqD value of obtaining to finish the setting of self then.
Wherein, those skilled in the art can be known, the selection of range finding ONU can be to select one or more ONU that handle as range finding among a plurality of ONU that therefrom insert arbitrarily, and the default rule of all right basis specifies the more individual ONU of among each ONU that inserts as the ONU that finds range.The embodiment of the invention is not limited in concrete mode and the rule of selecting range finding ONU.
Especially, the system of the optical network data transmission that the embodiment of the invention provides, when specific implementation, the PON network can be as required under the prerequisite that satisfies the service delay requirement, determine number as range finding ONU, successively the range finding of range finding ONU is handled, obtained the mean value of this difference DELTA according to the active and standby Rtd difference DELTA of the ONU that respectively finds range that obtains then, thereby guaranteed the accuracy of calculating.Promptly when being a plurality of, correspondingly, spare OLT specifically comprises when distance-measuring equipment (range finding ONU): acquisition module is used to obtain the first roundtrip delay Rtd value of distance-measuring equipment (a plurality of) and non-distance-measuring equipment; Range finder module is used for obtaining successively the second roundtrip delay Rtd value of a plurality of distance-measuring equipments; Difference block is used for respectively the 2nd Rtd value of the distance-measuring equipment that obtains according to range finder module and the distance-measuring equipment Rtd value separately that acquisition module obtains, get access to distance-measuring equipment separately a Rtd value and the difference of the 2nd Rtd value; A plurality of differences are got the changing value that average is obtained the Rtd value; Processing module is used for a Rtd value of the non-distance-measuring equipment that the changing value that obtains according to difference block and acquisition module obtain, and obtains the 2nd Rtd value of non-distance-measuring equipment; According to the 2nd Rtd value of the distance-measuring equipment that obtains and the 2nd Rtd value of non-distance-measuring equipment, obtain and send the isostatic lag EqD value of distance-measuring equipment and non-distance-measuring equipment respectively.
Further, the system of the optical network data transmission that the embodiment of the invention provides, when specific implementation, the PON network can be as required under the prerequisite that satisfies the service delay requirement, transmitting apparatus can also be used for repeatedly obtaining the second roundtrip delay Rtd value of range finding ONU, then Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to the ONU that finds range, wherein, above-mentioned range finding ONU is specifically as follows one or more, thereby has guaranteed the accuracy that range finding is calculated.
The equipment that provides can also be provided in the system of the optical network data transmission that the embodiment of the invention provides, and is used for providing to transmitting apparatus the first roundtrip delay Rtd value of distance-measuring equipment and non-distance-measuring equipment.
To sum up, the system of the optical network data transmission that the embodiment of the invention provides, in the PON network, the active and standby OLT switching that (or main with OLT fault etc.) causes because the trunk optical fiber fault, spare OLT does not need all ONU are found range again, the Rtd value that only needs one of them ONU of range finding, leading with the Rtd value on the OLT according to ONU, just can obtain the difference DELTA of active and standby Rtd, no longer needing to carry out range finding for other ONU that insert handles, according to the difference DELTA of obtaining and other ONU former master with the Rtd value on the OLT, just can calculate the EqD value on the spare OLT of other ONU correspondence, handle, just can recover professional transmission owing to only need to carry out once range finding, saved greatly all ONU carried out the spent time of range finding, satisfied PON network carrying business the time postpone requirement.
Embodiment 3
Referring to Fig. 7, the embodiment of the invention provides a kind of equipment of optical network data transmission, and this equipment comprises:
Acquisition module is used to obtain the first roundtrip delay Rtd value (promptly main with the Rtd value on the OLT) of distance-measuring equipment and non-distance-measuring equipment;
Range finder module is used for sending distance measurement request to distance-measuring equipment, obtains the second roundtrip delay Rtd value (being the Rtd value on the spare OLT) of distance-measuring equipment according to the ranging response of distance-measuring equipment;
Difference block is used for a Rtd value of the distance-measuring equipment that obtains according to acquisition module and the 2nd Rtd value of the distance-measuring equipment that range finder module obtains, and obtains the changing value of Rtd value;
Processing module is used for a Rtd value of the non-distance-measuring equipment that the changing value that obtains according to difference block and acquisition module obtain, and obtains the 2nd Rtd value of non-distance-measuring equipment;
Sending module is used for the 2nd Rtd value of the distance-measuring equipment that obtains according to range finder module and the 2nd Rtd value of the non-distance-measuring equipment that processing module is obtained, and obtains and send the isostatic lag EqD value of distance-measuring equipment and non-distance-measuring equipment.
Especially, when distance-measuring equipment is a plurality of, correspondingly, the range finder module in the equipment of the optical network data transmission that the embodiment of the invention provides is used for obtaining successively the second roundtrip delay Rtd value of a plurality of distance-measuring equipments;
Correspondingly,
Difference block in the equipment of the optical network data transmission that the embodiment of the invention provides, be used for respectively the 2nd Rtd value separately of the distance-measuring equipment that obtains according to range finder module and the distance-measuring equipment Rtd value separately that acquisition module obtains, get access to distance-measuring equipment separately a Rtd value and the difference of the 2nd Rtd value; And a plurality of differences are got the changing value that average is obtained the Rtd value.
Further, the equipment of the optical network data transmission that the embodiment of the invention provides, when specific implementation, satisfying under the prerequisite that the PON network satisfies the service delay requirement, wherein the range finder module of this equipment is specially: range cells is used for repeatedly obtaining the second roundtrip delay Rtd value of distance-measuring equipment, Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to distance-measuring equipment, wherein, above-mentioned distance-measuring equipment is specifically as follows one or more, thereby has guaranteed the accuracy that range finding is calculated.
Wherein, be embodied as range finding ONU during above-mentioned distance-measuring equipment practical application, correspondingly, be presented as non-range finding ONU. during non-distance-measuring equipment practical application
Those skilled in the art can know that the optical-fiber network transmitting apparatus that the embodiment of the invention provides can also can be integrated among the OLT and realize separately to exist as functional entity.
To sum up, the optical-fiber network transmitting apparatus that the embodiment of the invention provides, in the PON network, the active and standby OLT switching that (or main with OLT fault etc.) causes because the trunk optical fiber fault, spare OLT as transmitting apparatus does not need all ONU are found range again, the Rtd value that only needs one of them ONU of range finding, leading with the Rtd value on the OLT according to ONU, just can obtain the difference DELTA of active and standby Rtd, no longer needing to carry out range finding for other ONU that insert handles, according to the difference DELTA of obtaining and other ONU former master with the Rtd value on the OLT, just can calculate the EqD value on the spare OLT of other ONU correspondence, form by broadcasting or clean culture sends to the EqD value that gets access among each ONU then, thereby realize that only needing to carry out once range finding handles, just can recover professional transmission, save greatly all ONU are carried out the spent time of range finding, satisfied PON network carrying business the time postpone requirement.
Part steps in the embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, as CD or hard disk etc.
The above only is specific embodiments of the invention;, for those skilled in the art, not all under the prerequisite that does not break away from the principle of the invention in order to restriction the present invention; any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. the method for an optical network data transmission is characterized in that, optical network unit ONU is a plurality of, and described method comprises:
Obtain the described ONU first roundtrip delay Rtd value separately;
From described ONU, select range finding ONU, obtain the second roundtrip delay Rtd value of described range finding ONU;
According to a Rtd value and the 2nd Rtd value of described range finding ONU, obtain the changing value of Rtd value;
According to the Rtd value of described changing value and non-range finding ONU, obtain the 2nd Rtd value of described non-range finding ONU;
According to the described ONU that obtains the 2nd Rtd value separately, obtain and send the isostatic lag EqD value of described ONU correspondence.
2. the method for optical network data transmission as claimed in claim 1 is characterized in that, also comprises after the step of the described second roundtrip delay Rtd value of obtaining described range finding ONU:
According to described the 2nd Rtd value, obtain and send the isostatic lag EqD value of described range finding ONU;
Correspondingly, the step of the isostatic lag EqD value of described ONU correspondence is obtained and sent to the described ONU that described basis is obtained the 2nd Rtd value separately, is specially:
According to the 2nd Rtd value separately of the non-range finding ONU that obtains, obtain and send the isostatic lag EqD of described non-range finding ONU correspondence.
3. the method for optical network data transmission as claimed in claim 1 is characterized in that, optical network unit ONU is a plurality of, and described range finding ONU is a plurality of; The described range finding ONU that selects from described ONU obtains the second roundtrip delay Rtd value of described range finding ONU, and according to a Rtd value and the 2nd Rtd value of the described ONU that finds range, the step of obtaining the changing value of Rtd value is specially:
From described ONU, select a plurality of range finding ONU, obtain the second roundtrip delay Rtd value of described a plurality of range finding ONU successively;
According to a described range finding ONU Rtd value and the 2nd Rtd value separately, get access to the Rtd value separately of described range finding ONU and the difference of the 2nd Rtd value respectively; Described a plurality of differences are got the changing value that average is obtained the Rtd value.
4. the method for the described optical network data transmission of claim 1 is characterized in that, the described step of obtaining the second roundtrip delay Rtd value of described range finding ONU is specially:
Repeatedly obtain the second roundtrip delay Rtd value of described range finding ONU, Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to the described ONU of range finding, described range finding ONU is one or more.
5. the method for optical network data transmission as claimed in claim 1 is characterized in that, the described step of obtaining the described ONU first roundtrip delay Rtd value separately is specially:
Obtain the main described ONU first roundtrip delay Rtd value separately that sends with optical line terminal.
6. the method for the described optical network data transmission of claim 1 is characterized in that, described roundtrip delay Rtd value specifically comprises:
Optical network unit ONU processing delay value, branch optical fiber propagation delay value, trunk optical fiber propagation delay value, optical line terminal OLT processing delay value.
7. the system of an optical network data transmission is characterized in that, described system comprises: transmitting apparatus, distance-measuring equipment, non-distance-measuring equipment, wherein,
Described transmitting apparatus is used to obtain the first roundtrip delay Rtd value of described distance-measuring equipment and described non-distance-measuring equipment; Also be used for sending distance measurement request, obtain the second roundtrip delay Rtd value of described distance-measuring equipment according to the ranging response of described distance-measuring equipment to described distance-measuring equipment; According to a Rtd value and the 2nd Rtd value of described distance-measuring equipment, obtain the changing value of Rtd value; After getting access to described changing value,, obtain the 2nd Rtd value of described non-distance-measuring equipment according to a Rtd value of described changing value and described non-distance-measuring equipment; According to the 2nd Rtd value of the described distance-measuring equipment that obtains and the 2nd Rtd value of described non-distance-measuring equipment, obtain and send the isostatic lag EqD value of described distance-measuring equipment and described non-distance-measuring equipment respectively;
Described distance-measuring equipment is used to receive the distance measurement request that described transmitting apparatus sends, and returns ranging response to described transmitting apparatus; Also be used to receive the isostatic lag EqD value that described transmitting apparatus sends.
Described non-distance-measuring equipment is used to receive the isostatic lag EqD value that described transmitting apparatus sends.
8. the system of optical network data transmission as claimed in claim 7, it is characterized in that, described transmitting apparatus also is used for repeatedly obtaining the second roundtrip delay Rtd value of described distance-measuring equipment, Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to described distance-measuring equipment, and described distance-measuring equipment is one or more.
9. the system of optical network data transmission as claimed in claim 7 is characterized in that, described distance-measuring equipment is a plurality of, and correspondingly, described transmitting apparatus comprises:
Acquisition module is used to obtain the first roundtrip delay Rtd value of described distance-measuring equipment and described non-distance-measuring equipment;
Range finder module is used for obtaining successively the second roundtrip delay Rtd value of described a plurality of distance-measuring equipments;
Difference block is used for respectively the 2nd Rtd value of the described distance-measuring equipment that obtains according to described range finder module and the distance-measuring equipment Rtd value separately that described acquisition module obtains, get access to described distance-measuring equipment separately a Rtd value and the difference of the 2nd Rtd value; Described a plurality of differences are got the changing value that average is obtained the Rtd value;
Processing module is used for a Rtd value of the described non-distance-measuring equipment that the changing value that obtains according to described difference block and described acquisition module obtain, and obtains the 2nd Rtd value of described non-distance-measuring equipment; According to the 2nd Rtd value of the described distance-measuring equipment that obtains and the 2nd Rtd value of described non-distance-measuring equipment, obtain and send the isostatic lag EqD value of described distance-measuring equipment and described non-distance-measuring equipment respectively.
10. the system of optical network data transmission as claimed in claim 7 is characterized in that, described system also comprises:
Equipment is provided, is used for providing the first roundtrip delay Rtd value of described distance-measuring equipment and described non-distance-measuring equipment to described transmitting apparatus.
11. the equipment of an optical network data transmission is characterized in that, described equipment comprises:
Acquisition module is used to obtain the first roundtrip delay Rtd value of distance-measuring equipment and non-distance-measuring equipment;
Range finder module is used for sending distance measurement request to described distance-measuring equipment, obtains the second roundtrip delay Rtd value of described distance-measuring equipment according to the ranging response of described distance-measuring equipment;
Difference block is used for a Rtd value of the distance-measuring equipment that obtains according to described acquisition module and the 2nd Rtd value of the described distance-measuring equipment that described range finder module obtains, and obtains the changing value of Rtd value;
Processing module is used for a Rtd value of the non-distance-measuring equipment that the changing value that obtains according to described difference block and described acquisition module obtain, and obtains the 2nd Rtd value of described non-distance-measuring equipment;
Sending module is used for the 2nd Rtd value of the described distance-measuring equipment that obtains according to described range finder module and the 2nd Rtd value of the non-distance-measuring equipment that described processing module is obtained, and obtains and send the isostatic lag EqD value of described distance-measuring equipment and described non-distance-measuring equipment.
12. the equipment of optical network data transmission as claimed in claim 11 is characterized in that, described range finder module is specially:
Range cells is used for repeatedly obtaining the second roundtrip delay Rtd value of described distance-measuring equipment, and Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to described distance-measuring equipment.
13. the equipment of optical network data transmission as claimed in claim 11 is characterized in that, when described distance-measuring equipment is a plurality of,
Described range finder module is used for obtaining successively the second roundtrip delay Rtd value of described a plurality of distance-measuring equipments;
Correspondingly,
Described difference block, be used for respectively the 2nd Rtd value separately of the distance-measuring equipment that obtains according to described range finder module and the distance-measuring equipment Rtd value separately that described acquisition module obtains, get access to described distance-measuring equipment separately a Rtd value and the difference of the 2nd Rtd value; And described a plurality of differences are got the changing value that average is obtained the Rtd value.
14. the equipment of optical network data transmission as claimed in claim 11 is characterized in that, described optical-fiber network transmitting apparatus is integrated in the optical line terminal OLT.
15. the system of an optical network data transmission is characterized in that, described system comprises: optical line terminal OLT, range finding optical network unit ONU and non-range finding optical network unit ONU;
Described OLT is used to obtain the first roundtrip delay Rtd value of described range finding ONU and described non-range finding ONU; Also be used for sending distance measurement request, obtain the second roundtrip delay Rtd value of described range finding ONU according to the ranging response of described range finding ONU to described range finding ONU; According to a Rtd value and the 2nd Rtd value of described range finding ONU, obtain the changing value of Rtd value; After getting access to described changing value,, obtain the 2nd Rtd value of described non-range finding ONU according to the Rtd value of described changing value and described non-range finding ONU; According to the 2nd Rtd value of the described range finding ONU that obtains and the 2nd Rtd value of described non-range finding ONU, obtain and send the isostatic lag EqD value of described range finding ONU and described non-range finding ONU respectively;
Described range finding ONU is used to receive the distance measurement request that described OLT sends, and returns ranging response to described OLT; Also be used to receive the isostatic lag EqD value that described OLT sends.
Described non-range finding ONU is used to receive the isostatic lag EqD value that described OLT sends.
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| PCT/CN2009/071134 WO2009124484A1 (en) | 2008-04-09 | 2009-04-01 | A method, system and device for transmitting data in optical network |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2009124484A1 (en) | 2009-10-15 |
| CN101557539B (en) | 2012-11-21 |
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