CN101557539B - 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 PDF

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Publication number
CN101557539B
CN101557539B CN2008100919491A CN200810091949A CN101557539B CN 101557539 B CN101557539 B CN 101557539B CN 2008100919491 A CN2008100919491 A CN 2008100919491A CN 200810091949 A CN200810091949 A CN 200810091949A CN 101557539 B CN101557539 B CN 101557539B
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value
distance
onu
measuring equipment
rtd value
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CN101557539A (en
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杨素林
牛乐宏
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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
    • 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
    • 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
    • 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]
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Small-Scale Networks (AREA)

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

A kind of method of optical network data transmission, system and equipment
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; Referring to Fig. 1; The PON network is by OLT (Optical Line Terminal, optical line terminal), OS (Optical Splitter, optical branching device) and ONU (Optical Network Unit; Optical network unit) constitutes; OLT is connected with OS through a trunk optical fiber as local side apparatus, and OS connects each ONU through 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, through 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 through 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.In original PON network, having increased just becomes active point-to-multipoint Optical Access Network behind the power amplifier.For describing conveniently, 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) has formulated the GPON standard as the mainstream applications technology of PON network.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; Need the different of basis and 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), this EqD value is obtained in the following manner:
OLT handles through 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 through the Rtd value, and the EqD that calculating is obtained is sent among this ONU; ONU receives the delay time setting of accomplishing self behind the EqD.Wherein, when calculating the EqD value of this ONU through the Rtd value, concrete reference formula is following:
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, through being the main mode that subsequent use OLT is provided with OLT, guarantees that the PON network can continue to provide professional when OLT fault or trunk optical fiber fault; Detecting mainly, switch to subsequent use PON LT module and subsequent use trunk optical fiber and continue to accomplish the purpose of communicating by letter with ONU, thereby assurance PON network still can continue to provide business 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, active and standby with the different difference of the length of 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 the process of range finding is following: master new behind active and standby the switching sends POPUP message with OLT to all ONU broadcasting; Notice ONU is the RANGING state by the POPUP state exchange, and (range measurement principle is with the above) handled in the range finding that begins all ONU.Because it is serial that the range finding of ONU is handled, OLT accomplishes 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 accomplished, 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 can find out that 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 (like the appearance of the situation of above-mentioned masterslave switchover); As still adopt the method for the distance of resurveying that provides in the existing standard; For those service delay require is wanted high business, like 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, the continuity of the business of guaranteeing to provide reduces service outage duration, satisfies professional delay requirement, and the embodiment of the invention provides a kind of method, system and equipment of optical network data transmission.Said technical scheme is following:
On the one hand, a kind of method of optical network data transmission is provided, optical network unit ONU is a plurality of, and said method comprises:
Spare OLT is obtained the said ONU first roundtrip delay Rtd value separately;
Spare OLT is selected range finding ONU from said ONU, obtain the second roundtrip delay Rtd value of said range finding ONU;
Spare OLT is obtained the changing value of Rtd value according to a Rtd value and the 2nd Rtd value of said range finding ONU;
Spare OLT is obtained the 2nd Rtd value of said non-range finding ONU according to the Rtd value of said changing value and non-range finding ONU;
The corresponding isostatic lag EqD value of said ONU is obtained and sent to spare OLT according to said ONU the 2nd Rtd value of obtaining separately.
On the other hand, a kind of system of optical network data transmission is provided, said system comprises: transmitting apparatus, distance-measuring equipment, non-distance-measuring equipment, wherein,
Said transmitting apparatus is used to obtain the first roundtrip delay Rtd value of said distance-measuring equipment and said non-distance-measuring equipment; Also be used for sending distance measurement request, obtain the second roundtrip delay Rtd value of said distance-measuring equipment according to the ranging response of said distance-measuring equipment to said distance-measuring equipment; According to a Rtd value and the 2nd Rtd value of said distance-measuring equipment, obtain the changing value of Rtd value; After getting access to said changing value,, obtain the 2nd Rtd value of said non-distance-measuring equipment according to a Rtd value of said changing value and said non-distance-measuring equipment; Respectively according to the 2nd Rtd value of the said distance-measuring equipment that obtains and the 2nd Rtd value of said non-distance-measuring equipment, the isostatic lag EqD value of obtaining and sending said distance-measuring equipment and said non-distance-measuring equipment;
Said distance-measuring equipment is used to receive the distance measurement request that said transmitting apparatus sends, and returns ranging response to said transmitting apparatus; Also be used to receive the isostatic lag EqD value that said transmitting apparatus sends;
Wherein, said transmitting apparatus is a spare OLT, and said distance-measuring equipment is range finding ONU, and said non-distance-measuring equipment is non-range finding ONU.
Said non-distance-measuring equipment is used to receive the isostatic lag EqD value that said transmitting apparatus sends.
Again on the one hand, a kind of equipment of optical network data transmission is provided, said 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 said distance-measuring equipment, obtains the second roundtrip delay Rtd value of said distance-measuring equipment according to the ranging response of said distance-measuring equipment;
Difference block, a Rtd value of the distance-measuring equipment that is used for obtaining according to said acquisition module and the 2nd Rtd value of the said distance-measuring equipment that said range finder module obtains are obtained the changing value of Rtd value;
Processing module, a Rtd value of the non-distance-measuring equipment that changing value that is used for obtaining according to said difference block and said acquisition module obtain is obtained the 2nd Rtd value of said non-distance-measuring equipment;
Sending module, the 2nd Rtd value of the said distance-measuring equipment that is used for obtaining and the 2nd Rtd value of the non-distance-measuring equipment that said processing module is obtained, the isostatic lag EqD value of obtaining and sending said distance-measuring equipment and said non-distance-measuring equipment according to said range finder module;
Wherein, the said first roundtrip delay Rtd value is main with the Rtd value on the OLT, and the said second roundtrip delay Rtd value is the Rtd value on the spare OLT.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
When the PON network occurs mainly carrying out masterslave switchover with fiber failure or main the triggering after with the OLT equipment fault, when spare OLT is being carried out ranging process and handled, through an execution range operation to an ONU; Promptly only the find range Rtd value of an ONU; According to the difference of the active and standby Rtd of Rtd value this ONU of acquisition, 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 then; The EqD that accomplishes ONU is set then; Thereby saved the time of range finding, particularly when the ONU number more for a long time, the method for utilizing the embodiment of the invention to provide can reduce a large number of services break period; The continuity of the business that has guaranteed to provide, and then satisfy the TDM professional requirement higher of the PON network carrying to delay requirement.
Description of drawings
Fig. 1 is the PON network architecture sketch map that prior art provides;
Fig. 2 is the sketch map 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 sketch map 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 sketch map of system of the optical network data transmission that provides of the embodiment of the invention 2;
Fig. 7 is the equipment sketch map of the optical network data transmission that provides of the embodiment of the invention 3.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
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 corresponding isostatic lag EqD value of ONU.
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 corresponding isostatic lag EqD value of ONU, 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 corresponding isostatic lag EqD of non-range finding ONU.
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 find range isostatic lag EqD value of ONU of the next one 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 corresponding isostatic lag EqD value of ONU 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 corresponding isostatic lag EqD value of non-range finding ONU.
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 through obtaining the main ONU that sends with the optical line terminal first roundtrip delay Rtd value separately, also can realization be set through 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, is carried out in the ranging process in spare OLT; Through an execution range operation to an ONU; Promptly only the find range Rtd value of an ONU obtains the difference △ 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 △ 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 through message at last is issued among each self-corresponding ONU, owing to only need an ONU among all ONU that insert is carried out range operation, can recover traffic 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 for utilizing the embodiment of the invention to provide can reduce a large number of services break period, and then satisfies the TDM professional requirement higher to 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.
Embodiment 1
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 sketch map of the masterslave switchover that Fig. 2 provides; In the process that active and standby OLT switches; Because main isoparametric different with the length of trunk optical fiber and subsequent use trunk optical fiber, the just new master of spare OLT is with the OLT processing of need finding range again to the ONU of access.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, need carry out masterslave switchover to lead the trunk optical fiber that uses OLT to break down in the present embodiment and describe as example, 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 is convenient for describing, and before business transmission recovery, will new master be called spare OLT with OLT).Each ONU detects the LOS alarm, gets into the POPUP state.
Wherein, After main trunk optical fiber with OLT breaks down and since main with OLT and each ONU owing to the signal that does not receive the other side, all can detect dropout LOS and alarm; The master detects the LOS alarm with OLT; Know that the master occurring uses 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 subsequent use 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 business transmission 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 through 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 that inserts 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.Can Rtd value that lead the ONU that obtains with OLT be called the main Rtd of ONUi for the ease of statement, be expressed as Rtd (master) ONUi (wherein, i ONU among the ONUi ONU that representes to insert).
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 of access, and along with the dilatation of the capacity of OPN network; Its number that inserts ONU equipment is with a large amount of increases; Subsequent use 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 preset 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 is sent 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 Range Response 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 is sent, 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 △ 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 through 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 made up of ONU processing delay value, branch optical fiber propagation delay value, trunk optical fiber propagation delay value, OLT processing delay value; Because ONU that the trunk optical fiber fault causes is taking place from main when switching to spare OLT equipment with OLT equipment, the ONU processing delay value in its Rtd value on active and standby OLT equipment, branch optical fiber propagation delay value, OLT processing delay value remain unchanged, and unique change is that the trunk optical fiber propagation delay value that the difference because of active and standby trunk optical fiber length 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 △, that is: Rtd (master) Rtd (being equipped with)=△.
108: spare OLT is calculated Rtd (being equipped with) value of obtaining each ONU equipment according to obtaining Rtd (master) value of active and standby trunk optical fiber propagation delay difference △ with other each ONU that prestores.
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 through communication link, perhaps with OLT; 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 at the difference △ of the propagation delay value of active and standby trunk optical fiber section, that is:
△=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; Spare OLT range finding gets access to the active and standby trunk optical fiber propagation delay difference △ of an ONU, then can be according to other Rtd (master) value of ONU of preserving, the difference △ 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-△.
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-△), 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 through 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 concrete the realization, can adopt the form of broadcasting to issue, can adopt the form of clean culture to issue yet, the embodiment of the invention does not limit the concrete mode of sending Ranging Time PLOAM message.
After each ONU receives the Ranging Time PLOAM message from the spare OLT transmission, carry out delay time setting according to the EqD that wherein carries (being equipped with), and trigger the OPERATION state that gets into separately, the transmission that recovers interrupted service.So far, spare OLT is accomplished 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, to 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; Then any time after step 106, spare OLT can be passed through Ranging Time PLOAM message, and 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 sketch map that sends the method for data, and as shown in the figure, the process of this information interaction is following:
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 accomplished, 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 △ according to range finding ONU range finding processing.According to this △ 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 like above-mentioned mutual signal, can set ONU at the POPUP state, if receive the distance measurement request Ranging request 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 concrete the realization; The PON network can be confirmed 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; Active and standby Rtd difference △ according to the ONU that respectively finds range that obtains obtains the mean value of this difference △ then, thereby has guaranteed the accuracy of calculating.
The invention described above embodiment is to lead the explanation of using trunk optical fiber fault triggering masterslave switchover to carry out as example in the PON network, 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 for the optical network data transmission that the embodiment of the invention provides is in the PON network; Because the active and standby OLT that the trunk optical fiber fault causes switches, spare OLT need not found range to all ONU again, only needs the Rtd value of one of them ONU of range finding; Just can obtain the difference △ of active and standby Rtd main with the Rtd value on the OLT according to ONU, no longer need carry out range finding for other ONU that insert and handle; According to the difference △ that obtains and other ONU former master with the Rtd value on the OLT; Just can calculate the EqD value on the corresponding spare OLT of other ONU, handle, just can recover traffic transmission owing to only need to carry out once range finding; Saved greatly all ONU carried out the spent time of range finding, satisfied the PON network carrying professional the time postpone requirement.
Embodiment 2
In the PON network, because the active and standby OLT switching that trunk optical fiber fault etc. cause, 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; Respectively according to the 2nd Rtd value of the distance-measuring equipment that obtains and the 2nd Rtd value of non-distance-measuring equipment, the isostatic lag EqD value of obtaining and sending distance-measuring equipment and non-distance-measuring equipment;
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, the 2nd Rtd value of the distance-measuring equipment that is used for respectively obtaining according to range finder module and the distance-measuring equipment Rtd value separately that acquisition module obtains get access to a distance-measuring equipment Rtd value and the difference of the 2nd Rtd value separately; A plurality of differences are got the changing value that average is obtained the Rtd value;
Processing module, a Rtd value of the non-distance-measuring equipment that changing value that is used for obtaining according to difference block and acquisition module obtain is obtained the 2nd Rtd value of non-distance-measuring equipment; Respectively according to the 2nd Rtd value of the distance-measuring equipment that obtains and the 2nd Rtd value of non-distance-measuring equipment, the isostatic lag EqD value of obtaining and sending distance-measuring equipment and non-distance-measuring equipment.
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 specify, 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 that subsequent use trunk optical fiber is corresponding, 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 corresponding Rtd of the subsequent use trunk optical fiber of this range finding ONU and master difference △ (i.e. the changing value of a Rtd value and the 2nd Rtd value) with 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 △, get access to the corresponding Rtd value of subsequent use trunk optical fiber of non-range finding ONU with the non-range finding ONU that obtains; Then, the corresponding isostatic lag EqD value of distance-measuring equipment and non-distance-measuring equipment is obtained and sent to the Rtd value corresponding according to the subsequent use trunk optical fiber of distance-measuring equipment that obtains and non-distance-measuring equipment;
Range finding ONU is used to receive the distance measurement request that spare OLT is sent, and returns ranging response to spare OLT; And be used to receive the isostatic lag EqD value that spare OLT is sent, utilize the EqD value of obtaining to accomplish the setting of self then.
Non-range finding ONU is used to receive the isostatic lag EqD that spare OLT is sent, and utilizes the EqD value of obtaining to accomplish 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 preset 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 concrete the realization, the PON network can be as required under the prerequisite that satisfies the service delay requirement; Confirm number as range finding ONU; Successively the range finding of range finding ONU is handled, the active and standby Rtd difference △ according to the ONU that respectively finds range that obtains obtains the mean value of this difference △ then, thereby has 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, the 2nd Rtd value of the distance-measuring equipment that is used for respectively obtaining according to range finder module and the distance-measuring equipment Rtd value separately that acquisition module obtains get access to a distance-measuring equipment Rtd value and the difference of the 2nd Rtd value separately; A plurality of differences are got the changing value that average is obtained the Rtd value; Processing module, a Rtd value of the non-distance-measuring equipment that changing value that is used for obtaining according to difference block and acquisition module obtain is obtained the 2nd Rtd value of non-distance-measuring equipment; Respectively according to the 2nd Rtd value of the distance-measuring equipment that obtains and the 2nd Rtd value of non-distance-measuring equipment, the isostatic lag EqD value of obtaining and sending distance-measuring equipment and non-distance-measuring equipment.
Further, the system of the optical network data transmission that the embodiment of the invention provides is when concrete the realization; 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 specifically can be for one or more, thereby guaranteed the accuracy that range finding is calculated.
The system of the optical network data transmission that the embodiment of the invention provides can also comprise the equipment that 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 is in the PON network; The active and standby OLT that (or main with OLT fault etc.) causes because the trunk optical fiber fault switches, and spare OLT need not found range to all ONU again, the Rtd value of one of them ONU that only needs to find range; Just can obtain the difference △ of active and standby Rtd main with the Rtd value on the OLT according to ONU, no longer need carry out range finding for other ONU that insert and handle; According to the difference △ that obtains and other ONU former master with the Rtd value on the OLT; Just can calculate the EqD value on the corresponding spare OLT of other ONU, handle, just can recover traffic transmission owing to only need to carry out once range finding; Saved greatly all ONU carried out the spent time of range finding, satisfied the PON network carrying professional 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, a Rtd value of the distance-measuring equipment that is used for obtaining according to acquisition module and the 2nd Rtd value of the distance-measuring equipment that range finder module obtains are obtained the changing value of Rtd value;
Processing module, a Rtd value of the non-distance-measuring equipment that changing value that is used for obtaining according to difference block and acquisition module obtain is obtained the 2nd Rtd value of non-distance-measuring equipment;
Sending module, the 2nd Rtd value of the distance-measuring equipment that is used for obtaining and the 2nd Rtd value of the non-distance-measuring equipment that processing module is obtained, the isostatic lag EqD value of obtaining and sending distance-measuring equipment and non-distance-measuring equipment according to range finder module.
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; The 2nd Rtd value separately of the distance-measuring equipment that is used for respectively obtaining according to range finder module and the distance-measuring equipment Rtd value separately that acquisition module obtains get access to a distance-measuring equipment Rtd value and the difference of the 2nd Rtd value separately; 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 is when concrete the realization; 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 specifically can be for one or more, thereby 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 is in the PON network; The active and standby OLT that (or main with OLT fault etc.) causes because the trunk optical fiber fault switches, and need all ONU not found range again as the spare OLT of transmitting apparatus, the Rtd value of one of them ONU that only needs to find range; Leading with the Rtd value on the OLT according to ONU; Just can obtain the difference △ of active and standby Rtd, no longer need carry out range finding for other ONU that insert and handle, according to the difference △ that obtains and other ONU former master with the Rtd value on the OLT; Just can calculate the EqD value on the corresponding spare OLT of other ONU; Form through broadcasting or clean culture sends to the EqD value that gets access among each ONU then, thereby realizes that only needing to carry out once range finding handles, and just can recover traffic transmission; Saved greatly all ONU carried out the spent time of range finding, satisfied the PON network carrying professional 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, like CD or hard disk etc.
The above is merely specific embodiment of the present invention;,, not all under the prerequisite that does not break away from the principle of the invention for those skilled in the art 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 (14)

1. the method for an optical network data transmission is characterized in that, optical network unit ONU is a plurality of, and said method comprises:
Spare OLT is obtained the said ONU first roundtrip delay Rtd value separately;
Spare OLT is selected range finding ONU from said ONU, obtain the second roundtrip delay Rtd value of said range finding ONU;
Spare OLT is obtained the changing value of Rtd value according to a Rtd value and the 2nd Rtd value of said range finding ONU;
Spare OLT is obtained the 2nd Rtd value of said non-range finding ONU according to the Rtd value of said changing value and non-range finding ONU;
The corresponding isostatic lag EqD value of said ONU is obtained and sent to spare OLT according to said ONU the 2nd Rtd value of obtaining separately.
2. the method for optical network data transmission as claimed in claim 1 is characterized in that, also comprises after the step of the said second roundtrip delay Rtd value of obtaining said range finding ONU:
The isostatic lag EqD value of said range finding ONU is obtained and sent to spare OLT according to said the 2nd Rtd value;
Correspondingly, the step of the corresponding isostatic lag EqD value of said ONU is obtained and sent to said spare OLT according to said ONU the 2nd Rtd value of obtaining separately, is specially:
The corresponding isostatic lag EqD of said non-range finding ONU is obtained and sent to spare OLT according to the 2nd Rtd value separately of the non-range finding ONU that obtains.
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 said range finding ONU is a plurality of; Said spare OLT is selected range finding ONU from said ONU, obtain the second roundtrip delay Rtd value of said range finding ONU, and spare OLT is according to a Rtd value and the 2nd Rtd value of said range finding ONU, and the step of obtaining the changing value of Rtd value is specially:
Spare OLT is selected a plurality of range finding ONU from said ONU, obtain the second roundtrip delay Rtd value of said a plurality of range finding ONU successively;
Spare OLT gets access to the Rtd value separately of said range finding ONU and the difference of the 2nd Rtd value respectively according to a said range finding ONU Rtd value and the 2nd Rtd value separately; Said 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 said step of obtaining the second roundtrip delay Rtd value of said range finding ONU is specially:
Spare OLT is repeatedly obtained the second roundtrip delay Rtd value of said range finding ONU, and Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to the said ONU of range finding, and said 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 said step of obtaining the said ONU first roundtrip delay Rtd value separately is specially:
Spare OLT is obtained the main said ONU first roundtrip delay Rtd value separately of sending with optical line terminal.
6. the method for the described optical network data transmission of claim 1 is characterized in that, said 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, said system comprises: transmitting apparatus, distance-measuring equipment, non-distance-measuring equipment, wherein,
Said transmitting apparatus is used to obtain the first roundtrip delay Rtd value of said distance-measuring equipment and said non-distance-measuring equipment; Also be used for sending distance measurement request, obtain the second roundtrip delay Rtd value of said distance-measuring equipment according to the ranging response of said distance-measuring equipment to said distance-measuring equipment; According to a Rtd value and the 2nd Rtd value of said distance-measuring equipment, obtain the changing value of Rtd value; After getting access to said changing value,, obtain the 2nd Rtd value of said non-distance-measuring equipment according to a Rtd value of said changing value and said non-distance-measuring equipment; Respectively according to the 2nd Rtd value of the said distance-measuring equipment that obtains and the 2nd Rtd value of said non-distance-measuring equipment, the isostatic lag EqD value of obtaining and sending said distance-measuring equipment and said non-distance-measuring equipment;
Said distance-measuring equipment is used to receive the distance measurement request that said transmitting apparatus sends, and returns ranging response to said transmitting apparatus; Also be used to receive the isostatic lag EqD value that said transmitting apparatus sends;
Said non-distance-measuring equipment is used to receive the isostatic lag EqD value that said transmitting apparatus sends;
Wherein, said transmitting apparatus is a spare OLT, and said distance-measuring equipment is range finding ONU, and said non-distance-measuring equipment is non-range finding ONU.
8. the system of optical network data transmission as claimed in claim 7; It is characterized in that; Said transmitting apparatus also is used for repeatedly obtaining the second roundtrip delay Rtd value of said distance-measuring equipment; Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to said distance-measuring equipment, and said distance-measuring equipment is one or more.
9. the system of optical network data transmission as claimed in claim 7 is characterized in that, said distance-measuring equipment is a plurality of, and correspondingly, said transmitting apparatus comprises:
Acquisition module is used to obtain the first roundtrip delay Rtd value of said distance-measuring equipment and said non-distance-measuring equipment;
Range finder module is used for obtaining successively the second roundtrip delay Rtd value of said a plurality of distance-measuring equipments;
Difference block, the 2nd Rtd value of the said distance-measuring equipment that is used for respectively obtaining according to said range finder module and the distance-measuring equipment Rtd value separately that said acquisition module obtains get access to a said distance-measuring equipment Rtd value and the difference of the 2nd Rtd value separately; Said a plurality of differences are got the changing value that average is obtained the Rtd value;
Processing module, a Rtd value of the said non-distance-measuring equipment that changing value that is used for obtaining according to said difference block and said acquisition module obtain is obtained the 2nd Rtd value of said non-distance-measuring equipment; Respectively according to the 2nd Rtd value of the said distance-measuring equipment that obtains and the 2nd Rtd value of said non-distance-measuring equipment, the isostatic lag EqD value of obtaining and sending said distance-measuring equipment and said non-distance-measuring equipment.
10. the system of optical network data transmission as claimed in claim 7 is characterized in that, said system also comprises:
Equipment is provided, is used for providing the first roundtrip delay Rtd value of said distance-measuring equipment and said non-distance-measuring equipment to said transmitting apparatus.
11. the equipment of an optical network data transmission is characterized in that, said 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 said distance-measuring equipment, obtains the second roundtrip delay Rtd value of said distance-measuring equipment according to the ranging response of said distance-measuring equipment;
Difference block, a Rtd value of the distance-measuring equipment that is used for obtaining according to said acquisition module and the 2nd Rtd value of the said distance-measuring equipment that said range finder module obtains are obtained the changing value of Rtd value;
Processing module, a Rtd value of the non-distance-measuring equipment that changing value that is used for obtaining according to said difference block and said acquisition module obtain is obtained the 2nd Rtd value of said non-distance-measuring equipment;
Sending module, the 2nd Rtd value of the said distance-measuring equipment that is used for obtaining and the 2nd Rtd value of the non-distance-measuring equipment that said processing module is obtained, the isostatic lag EqD value of obtaining and sending said distance-measuring equipment and said non-distance-measuring equipment according to said range finder module;
Wherein, the said first roundtrip delay Rtd value is main with the Rtd value on the OLT, and the said second roundtrip delay Rtd value is the Rtd value on the spare OLT.
12. the equipment of optical network data transmission as claimed in claim 11 is characterized in that, said range finder module is specially:
Range cells is used for repeatedly obtaining the second roundtrip delay Rtd value of said distance-measuring equipment, and Rtd value is repeatedly got the second roundtrip delay Rtd value that average gets access to said distance-measuring equipment.
13. the equipment of optical network data transmission as claimed in claim 11 is characterized in that, when said distance-measuring equipment is a plurality of,
Said range finder module is used for obtaining successively the second roundtrip delay Rtd value of said a plurality of distance-measuring equipments;
Correspondingly,
Said difference block; The 2nd Rtd value separately of the distance-measuring equipment that is used for respectively obtaining according to said range finder module and the distance-measuring equipment Rtd value separately that said acquisition module obtains get access to a said distance-measuring equipment Rtd value and the difference of the 2nd Rtd value separately; And said 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, said optical-fiber network transmitting apparatus is integrated in the optical line terminal OLT.
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