CN107645354A

CN107645354A - Passage method of adjustment and device

Info

Publication number: CN107645354A
Application number: CN201710724871.1A
Authority: CN
Inventors: 耿丹; 张伟良; 郭勇; 李长垒; 苏婕; 贝劲松; 曾冠军; 高扬
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-04-19
Filing date: 2012-04-19
Publication date: 2018-01-30
Also published as: CN103378918B; CN103378918A

Abstract

The application proposes that a kind of passage method of adjustment and device, one of which passage method of adjustment include：Spare OLT knows that active channel corresponding to the first primary OLT breaks down；Physical channel corresponding to itself is adjusted to physical channel corresponding to the first primary OLT by spare OLT.It can solve the problem that using the present invention and extend time of switching in correlation technique, influence the fast quick-recovery proper communications of ONU and OLT, it is impossible to the problem of meeting requirement of the user to the fast quick-recovery of network failure and higher equipment cost.

Description

Passage method of adjustment and device

This case is the divisional application of patent application 201210116210.8, and the applying date of original application is on April 19th, 2012, Application No. 201210116210.8, invention and created name are passage method of adjustment and device.

Technical field

The present invention relates to the communications field, in particular to passage method of adjustment and device.

Background technology

With the development of network technology, the business such as the substantial amounts of voice of network transmission, data, video can be utilized, thus it is right The requirement of bandwidth improves constantly, and EPON (PON) is exactly caused by under this demand.

The topological structure of PON system as shown in figure 1, PON system generally by the optical line terminal (OLT) of office side, user side Optical network unit (ONU) and Optical Distribution Network (ODN, also referred to as optical splitter) composition, the point-to-multipoint network knot of generally use Structure.ODN is made up of the Passive Optical Components such as single-mode fiber and optical branching device, optical connector, the physical connection between OLT and ONU Light-transmitting medium is provided.Mainly there is time division multiplexing (Time Division Multiplexing, to be referred to as in PON technologies at present TDM) PON system, wavelength-division multiplex (Wavelength Division Multiplexing, referred to as WDM) PON system, orthogonal Frequency division multiplexing (Orthogonal Frequency Division Multiplexing, referred to as OFDM) PON system and mixing PON system, mixing PON system include Wave time division mixing PON system, frequency-division and time-division mixing PON system etc. and wavelength-division frequency division Time-division mixes PON system.

In time-multiplexed PON system, such as gigabit passive optical network (Gigabit-Capable Passive Optical Network, referred to as GPON) system, ethernet passive optical network (Ethernet Passive Optical Network, abbreviation EPON) system, 10 gigabit passive optical networks (10-Gigabit-capable passive optical Network, abbreviation XG-PON) in system and 10-Gigabit-capable EPON systems, down direction (by OLT to ONU) Data transfer uses broadcast mode, and each ONU receives all frames respectively, further according to ONU marks (ONU-ID), sensor network Interface identifier (GEM-Port ID), allocation identification (Allocation-ID), LLID (Logical Link Identity, referred to as LLID) etc. information obtain one's own frame.Passed for the data of up direction (from ONU to OLT) Defeated, because each ONU needs shared transmission medium, therefore each ONU should be up arranged to being transmitted in the time slot of oneself in OLT Data.

There are the optical transmitting set of multiple different wave lengths, the optical wavelength point of each optical transmitting set in WDM-PON systems, at OLT Not Wei λ d1, λ d2 ..., λ dn, wherein λ d1 are the wavelength of transmission downlink data use when OLT communicate with first ONU, and λ d2 are The wavelength ... that downlink data uses is sent when OLT communicates with second ONU, λ dn are under being sent when OLT communicates with n-th of ONU The wavelength that row data use；The generation wavelength of transmitter at each ONU is different from the transmitted wave of transmitter at other ONU It is long, such as it is λ u1 that first ONU, which is used for the launch wavelength of the OLT transmitters for sending upstream data, second ONU is used to give The launch wavelength that OLT sends the transmitter of upstream data is λ u2 ..., and n-th of ONU is used for the transmitting that upstream data is sent to OLT The launch wavelength of device is λ un, and using above-mentioned technology, OLT can send downlink data to all ONU simultaneously, and each ONU can also Upstream data is sent simultaneously, i.e. OLT and ONU are the structure using point-to-point on optical channel.

There are multiple different subcarriers in OFDM-PON systems, at OLT, each subcarrier is respectively C 1, C 2 ..., C N, and each subcarrier is orthogonal, it is (every to first group of subcarrier that OLT will be sent to first ONU modulate downstream data The quantity of group subcarrier can be with identical or different), OLT is sub to second group by the modulate downstream data for being sent to second ONU On carrier wave ..., OLT will be sent to n-th of ONU modulate downstream data to n-th group subcarrier, be sent under different ONU Do not occur simultaneously between subcarrier group used by row data, i.e., different ONU uses different subcarrier groups, and ONU is sent to OLT The subcarrier that uses of upstream data be that OLT distributes to ONU, at ONU for sent the subcarrier of upstream data to OLT with OLT uses the subcarrier for sending downlink data to current ONU identical, can also be different.Using above-mentioned technology, OLT can be simultaneously Downlink data is sent to all ONU, each ONU can also send upstream data simultaneously, i.e. OLT and ONU are to adopt on optical channel With the structure of point-to-point.

Wave time division mixes PON system and frequency-division and time-division mixes the topological structure of PON system as shown in Figure 2 a and 2 b. In Fig. 2 a and Fig. 2 b, each OLT manages one group of ONU, and one group of ONU that Wave time division is mixed in PON system is up for sending The upstream wavelength of data is identical, and the downstream wavelength for receiving downlink data is also identical；One in frequency-division and time-division mixing PON system The subcarrier group that group ONU is used to send upstream data is identical, and the subcarrier group for receiving downlink data is also identical, one group of ONU In different ONU upstream data is transmitted by time-multiplexed mode.Different OLT downstream wavelength (subcarrier group) is different, no The upstream wavelength (subcarrier group) used with every group of ONU of OLT management is also different.Each ONU is according to OLT order specific Upstream data is sent in ascending time slot.

In the application deployment of EPON, there are certain customers to need higher security, it is desirable to which operator can carry Ensure that its service channel does not interrupt for a kind of security mechanism, or the requirement of secondary one-level is, can be after service channel interruption Fast quick-recovery.This just proposes protection path to the EPON of carrying customer service operation and is switched fast wanting for path Ask.

Fig. 3 and Fig. 4 respectively illustrates in existing passive optical network standards two kinds of typical network architecture diagrams under protected mode.

What Fig. 3 was represented is the mode of the protection trunk optical fiber of type B.OLT two optical port PON (0) and PON (1) connect It is connected to 1：N optical splitter, this optical splitter down direction are connected to each ONU by optical fiber respectively.OLT optical port PON (0) passes through The path that optical splitter reaches ONU is primary path, and the path that OLT optical port PON (1) reaches ONU by optical splitter is standby logical Road.After primary path interrupts as the traffic path of optical network unit and optical line terminal, stand-by channel will be enabled and keep light net Communication between network unit and optical line terminal.

What Fig. 4 was represented is the all-fiber protection mode of Type C.OLT optical port PON (0) is connected to 1：N optical splitter 1, OLT optical port PON (1) is connected to 1：N optical splitter 2, the two optical splitters are connected by optical fiber with each ONU respectively.OLT light The path that mouth PON (0) reaches ONU by optical splitter 1 is primary path, and OLT optical port PON (1) passes through optical splitter 2 and reaches ONU Path be stand-by channel.It is standby by enabling after primary path interrupts as the traffic path of optical network unit and optical line terminal The communication between optical network unit and optical line terminal is kept with path.

Fig. 5 is listed when ONU carries out different operations respectively, is triggered the ONU and is entered various states.Specifically,

ONU is in original state (O1) when not carrying out any operation；

ONU receives downlink optical signal, when eliminating lock-out (LOS/LOF), into serial-number-state (O2, O3)；

ONU receives up overhead parameter, or ONU receives ONU ID, into distance measuring states (O4)；

When ONU receives balanced time delay (Equalization Delay, referred to as EqD), into running status (O5), so that Reception and transmission data can be realized；

If ONU detects path exception, LOS/LOF alarms are produced, then are transferred to dropout state (O6)；

When TO2 timer expiries, then ONU returns to original state (O1).

Under the existing protected mode of EPON, in conjunction with Fig. 5, to enable stand-by channel after primary path fault Illustrate the logic state transition process of optical network unit exemplified by process：

ONU and OLT are the pass communications of PON LT (0) mouth by primary path between the two, and ONU is in running status (O5)；

After primary path interrupts, ONU can't detect OLT optical signal in primary path, after producing LOS/LOF alarms, enter Enter ejection state (O6), after the duration that the time that ONU is in ejection state (O6) sets more than TO2 timers, into initial shape State (O1)；

OLT enables the stand-by channel i.e. path of PON LT (1) mouth, sends downlink optical signal to ONU, ONU detects OLT's After downlink optical signal, eliminate OLT LOS/LOF alarms, by stand-by channel and OLT complete frame demarcation and it is synchronous after, ONU is from first Beginning state (O1) is transferred to serial-number-state (O2, O3), and ONU receives the up overhead parameter that OLT is sent；Up overhead parameter bag Include：Lead code bit type；Delimiter parameter (Delimiter) etc.；OLT is after primary path is switched to stand-by channel, need pair Its ONU ID managed is redistributed, and the ID of each ONU after redistributing is sent to each ONU；ONU receives OLT hairs After the ONU-ID information sent, distance measuring states (O4) are transferred to；

After ONU receives the EqD message that OLT is sent, running status (O5) is transferred to from distance measuring states (O4)；

So far, the stand-by channel between ONU and OLT is completely set up, and ONU and OLT carries out information exchange by this stand-by channel.

In above path handoff procedure, after physical layer path is established on stand-by channel, OLT need to send the related datas such as EqD To all ONU, each ONU is required for updating inherent parameters after related data is received, and can recover normal operating conditions.With class Illustrated exemplified by type B network structure, when the ONU that an OLT is managed shares 32, in handoff procedure, OLT needs and 32 Individual ONU interactions are simultaneously fully completed state transition process as shown in Figure 5 (undergoing O1, O2, O3, O4 and O5).Existing procedure is deposited The problem of include：Each ONU, which completes above-mentioned a series of state transition, makes OLT to bear substantial amounts of messaging work； Extend the time of switching, influence the fast quick-recovery proper communications of ONU and OLT, ONU and OLT is recovered normal work and take substantially More than 100 milliseconds of magnitudes, it is impossible to meet requirement of the user to the fast quick-recovery of network failure.And protected in said process to realize A primary PON mouth and standby PON mouths at each OLT of function be present, i.e. OLT sides are 1：1 protection, adds equipment cost.

Time for extending switching in correlation technique, influence the fast quick-recovery proper communications of ONU and OLT, it is impossible to meet to use The problem of requirement of the family to the fast quick-recovery of network failure and higher equipment cost, effective solution is not yet proposed at present.

The content of the invention

Time for extending switching in correlation technique, influence the fast quick-recovery proper communications of ONU and OLT, it is impossible to meet to use The problem of requirement of the family to the fast quick-recovery of network failure and higher equipment cost, the invention provides passage method of adjustment and dress Put, at least to solve the above problems.

According to an aspect of the invention, there is provided a kind of passage method of adjustment, including：Standby optical line terminal OLT obtains Know that active channel corresponding to the first primary OLT breaks down；Physical channel corresponding to itself is adjusted to described by the spare OLT Physical channel corresponding to first primary OLT.

Preferably, the spare OLT knows that active channel corresponding to the described first primary OLT breaks down, including：It is described The failure notification that spare OLT receives at least one primary OLT or network management system is sent, know that the described first primary OLT is corresponding Active channel break down；Or the active channel state of each primary OLT of spare OLT active obtaining, know described Active channel corresponding to one primary OLT breaks down.

Preferably, each primary OLT of spare OLT active obtaining active channel state, knows the described first primary OLT Corresponding active channel breaks down, including：Information exchange is not present between the spare OLT and each optical network unit ONU When, physical channel corresponding to itself is adjusted to physical channel corresponding to the described first primary OLT by the spare OLT, if referring to In fixing time, the physical channel after the spare OLT is adjusted does not receive upstream data, then knows the described first primary OLT Corresponding active channel breaks down；Either the spare OLT is led to the described first primary OLT or the network management system Letter, knows that active channel corresponding to the described first primary OLT breaks down.

Preferably, physical channel corresponding to itself is adjusted to physics corresponding to the described first primary OLT by the spare OLT After passage, in addition to：Spare OLT ONU connections corresponding with the described first primary OLT, are established and the spare OLT pair The active channel answered；The spare OLT is corresponding by the described first primary OLT by the business of ONU corresponding to the described first primary OLT Active channel switch to active channel corresponding to the spare OLT.

Preferably, before the spare OLT knows that active channel corresponding to the first primary OLT breaks down, including：It is described Spare OLT receives the status information that each primary OLT is sent, wherein, the status information includes each primary OLT self-managements ONU passage relevant information and distance measurement result information；The spare OLT stores the status information.

Preferably, the passage relevant information includes at least one following：Each ONU mark ONU-ID, logic chain road sign Remember LLID, transmission container T-CONT, sequence number information, Media access contorl address and gigabit method for packing port-mark；Institute Stating distance measurement result information includes：Distance measurement value between the spare OLT and each ONU.

Preferably, when each ONU corresponding to the spare OLT is stored with the distance measurement value, corresponding each ONU receives institute The downlink frame of spare OLT transmission is stated, distance measurement value corresponding to itself transmission data is updated to the distance measurement value stored immediately；Or institute Each ONU corresponding to stating receives the order for the renewal distance measurement value that the spare OLT is sent, and itself will send survey corresponding to data immediately The distance measurement value of storage is updated to away from value；Or corresponding each ONU does not receive downlink frame in preset time, then actively will Distance measurement value corresponding to itself sending data is updated to the distance measurement value of storage.

Preferably, the distance measurement value is following one of any：Loop time delay value, balanced time delay value and loop time.

Preferably, the physical channel is following one of any：Wavelength, wavelength are to, subcarrier and subcarrier group.

According to another aspect of the present invention, there is provided another passage method of adjustment, including：Second primary optical link Terminal OLT knows that active channel corresponding to the first primary OLT breaks down；The second primary OLT itself increases a physics Passage, and increased physical channel is adjusted to physical channel corresponding to the described first primary OLT.

Preferably, the described second primary OLT knows that active channel corresponding to the first primary OLT breaks down, including：It is described Second failure notification that primary OLT receives at least one primary OLT or network management system is sent, knows the described first primary OLT Corresponding active channel breaks down；Or the second primary OLT active obtainings remaining each primary OLT active channel shape State, know that active channel corresponding to the described first primary OLT breaks down.

Preferably, described second primary OLT active obtainings remaining each primary OLT active channel state, knows described Active channel corresponding to one primary OLT breaks down, including：The second primary OLT is each with the described first primary OLT management When information exchange being not present between optical network unit ONU, the physical channel that itself is increased newly is adjusted to by the second primary OLT Physical channel corresponding to the first primary OLT, if within a specified time, the physics that the second primary OLT is increased newly through itself Passage does not receive upstream data, then knows that active channel corresponding to the described first primary OLT breaks down；Or described second Primary OLT is communicated with the described first primary OLT or the network management system, knows work corresponding to the described first primary OLT Broken down as path.

Preferably, before the described second primary OLT knows that active channel corresponding to the first primary OLT breaks down, including： The second primary OLT receives the status information that remaining each primary OLT is sent, wherein, the status information includes remaining each master With the ONU of OLT self-managements passage relevant information and distance measurement result information；The second primary OLT stores the state letter Breath；Wherein, the passage relevant information includes at least one following：Each ONU mark ONU-ID, logical links label L LID, Transmit container T-CONT, sequence number information, Media access contorl address and gigabit method for packing port-mark；The ranging knot Fruit information includes：Distance measurement value between the second primary OLT and each ONU.

Preferably, when each ONU stores the distance measurement value corresponding to the described second primary OLT, corresponding each ONU connects The downlink frame that the described second primary OLT is sent is received, distance measurement value corresponding to itself transmission data is updated to the ranging stored immediately Value；Or corresponding each ONU receives the order for the renewal distance measurement value that the described second primary OLT is sent, and immediately sends out itself Distance measurement value corresponding to data is sent to be updated to the distance measurement value of storage；Or corresponding each ONU is not received in preset time Distance measurement value corresponding to itself transmission data is updated to the distance measurement value stored by downlink frame, then active.

According to another aspect of the present invention, there is provided another passage method of adjustment, including：Optical network unit ONU Judge whether receive downlink data in preset time；If judged result is no, the ONU actively leads to the physics of itself Road is adjusted to the non-specified physical channel broken down.

Preferably, the specified physical channel includes：The physics that standby optical line terminal OLT transmission and reception data use Passage；Or first primary OLT use other transmission and receive data physical channel, wherein, the first primary OLT is Primary OLT corresponding to the ONU；Or other primary OLT in passive optical network PON system are used or newly-increased physics leads to Road, wherein, other described primary OLT are different primary OLT from the described first primary OLT.

Preferably, the physical channel of itself is adjusted to the non-specified physical channel broken down by the ONU, including：When It is described after the physical channel that self transmission and reception data use is adjusted to physical channel corresponding to the ONU by spare OLT ONU receives the adjustment notice that the spare OLT is sent, and the physical channel of itself is adjusted into the spare OLT transmits and receive The physical channel that data use, or the ONU receive the adjustment notice that the spare OLT is sent, by the physical channel of itself Be adjusted to other transmission that the described first primary OLT uses and the physical channel for receiving data, or the ONU receive it is described standby The adjustment sent with OLT is notified, the physical channel of itself is adjusted into other described primary OLT uses or newly-increased physics leads to Road；Other transmission and the physical channel of reception data that the first primary OLT uses itself are adjusted to corresponding to the ONU After physical channel, the ONU receives the adjustment notice that the described first primary OLT is sent, and the physical channel of itself is adjusted to Other transmission and the physical channel of reception data that the first primary OLT is used, or ONU receptions described first are primary The adjustment notice that OLT is sent, the physical channel of itself is adjusted to the physics that the spare OLT is transmitted and reception data use and led to Road, or the ONU receive the adjustment notice that the first primary OLT is sent, by the physical channel of itself be adjusted to it is described its He uses primary OLT or newly-increased physical channel；Other described primary OLT will be used or newly-increased physical channel is adjusted to described After physical channel corresponding to ONU, the ONU receives the adjustment notice that other described primary OLT are initiated, and the physics of itself is led to Road is adjusted to the physical channel that other described primary OLT are used or increased newly, or the ONU receives other described primary OLT hairs The adjustment notice risen, the physical channel of itself is adjusted to the physical channel that the spare OLT is transmitted and reception data use, or ONU described in person receives the adjustment notice that other described primary OLT are initiated, and it is primary that the physical channel of itself is adjusted into described first Other transmission and the physical channel of reception data that OLT is used.

Preferably, after the physical channel of itself is adjusted to the specified physical channel do not broken down by the ONU, bag Include：The distance measurement value that transmission data use is updated to the distance measurement value of the corresponding specified physical channel by the ONU；The ONU will The distance measurement value that data use is sent to be updated to before the distance measurement value of the corresponding specified physical channel, including：The ONU enters again Row ranging, the distance measurement value after being updated；Or the ranging that the ONU receives each primary OLT or the spare OLT is sent Value, as the distance measurement value of the corresponding OLT for sending distance measurement value active channel.

According to another aspect of the present invention, there is provided a kind of passage adjustment device, be arranged at standby optical line terminal OLT In, including：First knows module, for knowing that active channel corresponding to the first primary OLT breaks down；First adjusting module, For physical channel corresponding to itself to be adjusted into physical channel corresponding to the described first primary OLT.

According to another aspect of the present invention, there is provided another passage adjustment device, be arranged at what is do not broken down In second primary OLT, including：Second knows module, for knowing that active channel corresponding to the first primary OLT breaks down；The Two adjusting modules, for increasing a physical channel in the described second primary OLT, and increased physical channel is adjusted to institute State physical channel corresponding to the first primary OLT.

According to another aspect of the present invention, there is provided another passage adjustment device, be arranged at optical network unit ONU In, including：Judge module, for judging whether receive downlink data in preset time；3rd adjusting module, if for described When the judged result of judge module is no, then actively the specified physics that the physical channel of itself is adjusted to not break down is led to Road.

In embodiments of the present invention, exist exclusively for spare OLT standby primary OLT, as any one primary OLT ( One primary OLT) when breaking down, physical channel corresponding to itself is directly adjusted to corresponding to the first primary OLT by spare OLT Physical channel.As can be seen here, in this example, the type of physical channel is directly have adjusted, for ONU sides, the thing of ONU connections The type for managing passage does not change, and therefore, ONU need not do large variation, it is not required that changes oneself state, it is only necessary to after Continued access continues the physical channel.In OLT sides, spare OLT can be using flexibility by the physical channel of oneself to break down Primary OLT corresponding to physical channel, and need not be each OLT one spare OLT is set, i.e. do not need 1 in OLT sides： 1 protection, save equipment cost.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the topological structure schematic diagram according to the PDN systems of correlation technique；

Fig. 2 a are the topological structure schematic diagrames that PON system is mixed according to the Wave time division of correlation technique；

Fig. 2 b are the topological structure schematic diagrames that PON system is mixed according to the frequency-division and time-division of correlation technique；

Fig. 3 is the network architecture diagram according to the mode of the protection trunk optical fiber of the type B of correlation technique；

Fig. 4 is the network architecture diagram according to the all-fiber protection mode of the Type C of correlation technique；

Fig. 5 is the topological diagram according to the mixing PON comprising spare OLT of correlation technique；

Fig. 6 is the process chart of the first passage method of adjustment according to embodiments of the present invention；

Fig. 7 is the structural representation of the first passage adjustment device according to embodiments of the present invention；

Fig. 8 is the process chart of second of passage method of adjustment according to embodiments of the present invention；

Fig. 9 is the structural representation of second of passage adjustment device according to embodiments of the present invention；

Figure 10 is the process chart of the third passage method of adjustment according to embodiments of the present invention；And

Figure 11 is the structural representation of the third passage adjustment device according to embodiments of the present invention.

Embodiment

To make the goal of the invention of the present invention, technical scheme and beneficial effect of greater clarity, below in conjunction with the accompanying drawings to this The embodiment of invention is illustrated, it is necessary to illustrate, in the case where not conflicting, in the embodiment and embodiment in the application Feature can mutually be combined.

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that do not conflicting In the case of, the feature in embodiment and embodiment in the application can be mutually combined.

Referred in correlation technique, the problem of existing procedure is present includes：Each ONU completes as shown in Figure 5 a series of State transition OLT is born the work of substantial amounts of messaging, this results in the extension of the time of switching, influences ONU and OLT Fast quick-recovery proper communication, ONU and OLT is recovered normal work and take substantially more than 100 milliseconds of magnitudes, it is impossible to meet user Requirement to the fast quick-recovery of network failure.And it is to realize a primary PON at each OLT of defencive function be present in said process Mouth and standby PON mouths, i.e. OLT sides are 1：1 protection, adds equipment cost.

In order to solve the above technical problems, the embodiments of the invention provide a variety of passage methods of adjustment, for realizing relatively low Equipment cost on the basis of realize the adjustment of quick passage, and then realize during follow-up channel application and be quickly responsible to replace Switch, save switching time so that between ONU and OLT can quick-recovery proper communication soon, meet that user is quickly extensive to network failure Multiple requirement.Now a variety of passage methods of adjustment are illustrated successively.

The process chart of the first passage method of adjustment provided in an embodiment of the present invention refers to Fig. 2, its idiographic flow Including step S602 to step S604：

Step S602, spare OLT knows that active channel corresponding to the first primary OLT breaks down；

Step S604, physical channel corresponding to itself is adjusted to physical channel corresponding to the first primary OLT by spare OLT.

In embodiments of the present invention, exist exclusively for spare OLT standby primary OLT, as any one primary OLT ( One primary OLT) when breaking down, physical channel corresponding to itself is directly adjusted to physics corresponding to the primary OLT by spare OLT Passage.As can be seen here, in this example, the type of physical channel is directly have adjusted, for ONU sides, the physics that ONU is used leads to The type in road does not change, and therefore, ONU need not do large variation, it is not required that changes oneself state, it is only necessary to continue to connect Continue the physical channel.In OLT sides, the physical channel of oneself with flexibility can be adjusted to break down by spare OLT Primary OLT corresponding to physical channel, and need not be each OLT one spare OLT is set, i.e. do not need 1 in OLT sides： 1 protection, save equipment cost.

The first primary OLT herein is used only for the primary OLT for specifying a certain specific, active channel to break down, right OLT itself does not produce restriction.

In flow shown in Fig. 6, step S602 refers to that spare OLT can know that active channel corresponding to the first primary OLT is sent out Raw failure, it is contemplated that know the difference of mode, can be generally divided into two kinds, one kind is actively to know, another is passively to obtain Know.The mode passively known is typically that the failure that at least one primary OLT or network management system transmission are received by spare OLT is led to Know, so as to know that active channel corresponding to the first primary OLT breaks down.And the mode actively known is typically by spare OLT Each primary OLT of active obtaining active channel state, know that active channel corresponding to the first primary OLT breaks down.

When being known using active mode, spare OLT can actively communicate with other network elements or network management system and be obtained Know, specifically, spare OLT is communicated with the first primary OLT or network management system, know and worked corresponding to the first primary OLT Path breaks down.Another mode actively known can be that direct measurement is known, specifically, spare OLT and each light net When information exchange being not present between network unit ONU, the physical channel of oneself is sequentially adjusted in as each primary OLT by spare OLT Corresponding physical channel receives upstream data, if spare OLT corresponding to some primary OLT on physical channel within a specified time Upstream data is not received, then spare OLT knows that active channel corresponding to the primary OLT breaks down, for example, spare OLT will Physical channel corresponding to itself is adjusted to physical channel corresponding to the first primary OLT, if within a specified time, spare OLT is through adjusting Physical channel after whole does not receive upstream data, then knows that active channel corresponding to the first primary OLT breaks down.

During implementation, physical channel corresponding to primary OLT, which is broken down, generally includes following reason：First primary OLT receipts Hair device breaks down；Or first the optical fiber connected between the corresponding ONU of primary OLT break down.

In above preferred embodiment, for ensure PON system can normal work, spare OLT can utilize poll system according to Physical channel corresponding to secondary each primary OLT in PON system carries out fault inquiry, finds in time corresponding to the first primary OLT Break down physical channel.Or, it is preferred that spare OLT can also use periodic queries mode, each primary OLT pairs of inquiry Whether break down the physical channel answered.Or another preferable mode, inquired about using timing inquiry mode each primary Whether break down physical channel corresponding to OLT.It is, of course, also possible to using other inquiry modes, can ensure to find in time Physical channel corresponding to first primary OLT is broken down, in order to provide alternate channel.

Flow as shown in Figure 6, step S604 is after implementation, i.e., physical channel corresponding to itself is adjusted to by spare OLT After physical channel corresponding to first primary OLT, spare OLT ONU connections corresponding with the first primary OLT are established and spare OLT Corresponding active channel, and then spare OLT works the business of ONU corresponding to the first primary OLT as corresponding to the first primary OLT Active channel corresponding to CS channel switching to spare OLT.That is, spare OLT is first primary OLT pairs on its corresponding active channel The ONU distribution upstream bandwidths answered, wherein, each ONU for being allocated upstream bandwidth is sent in the upstream bandwidth that spare OLT is distributed Row data.Recover business between ONU and spare OLT.

Flow as shown in Figure 6, step S602 is before implementation, i.e., spare OLT knows that work is logical corresponding to the first primary OLT Before road is broken down, spare OLT can receive the status information that each primary OLT is sent and be stored locally, wherein, state Information includes the ONU of each primary OLT self-managements passage relevant information and distance measurement result information；

Preferably, passage relevant information can generally include at least one following：Each ONU ONU-ID, LLID, T- CONT, sequence number information, Media access contorl address and gigabit method for packing port-mark.

Preferably, distance measurement result information includes：Distance measurement value between spare OLT and each ONU.

When implementing, distance measurement value can be generally calculated as follows, is now described successively.

First way：Physical channel corresponding to itself is adjusted to physical channel corresponding to each primary OLT by spare OLT Afterwards, start to receive upstream data, and record the time for receiving upstream data；

The time announcement for receiving upstream data to each primary OLT, spare OLT is calculated by each primary OLT by spare OLT With the distance measurement value between each ONU.

The second way：Spare OLT obtains the time that each primary OLT sends downlink data；

After physical channel corresponding to itself is adjusted to physical channel corresponding to each primary OLT by spare OLT, start in reception Row data, and record the time for receiving upstream data；

Spare OLT calculates itself distance measurement value between each ONU according to the time of acquisition and the time of record.

Second of distance measuring method in implementation process, spare OLT need to obtain each primary OLT send downlink data when Between, specific acquisition modes are：Spare OLT receives the time that sent by each primary OLT, each primary OLT sends downlink data； Or spare OLT monitors the time that each primary OLT sends downlink data.

Distance measurement value is being obtained using first way, i.e., the survey between spare OLT and each ONU is calculated by each primary OLT After value, spare OLT receives and stored the distance measurement value that each primary OLT is calculated；Or spare OLT and corresponding each ONU connect The distance measurement value that each primary OLT is calculated is received, the distance measurement value calculated by each primary OLT of corresponding each ONU storages；

Distance measurement value is being obtained using the second way, i.e. spare OLT calculates itself according to the time for obtaining and recording After distance measurement value between each ONU, spare OLT notifies the distance measurement value calculated to each primary OLT, and passes through each primary OLT Each ONU corresponding to notice, the distance measurement value calculated by corresponding each ONU storages spare OLT.

During implementation, when the distance measurement value calculated by corresponding each ONU storages, currently used distance measurement value can use such as Under several different update modes：

The first：Corresponding each ONU receives the downlink frame that spare OLT is sent, and itself will send survey corresponding to data immediately The distance measurement value of storage is updated to away from value；

Second：Corresponding each ONU receives the order for the renewal distance measurement value that spare OLT is sent, and itself is sent into number immediately The distance measurement value of storage is updated to according to corresponding distance measurement value；

The third：Corresponding each ONU does not receive downlink frame in preset time, then itself will actively send data and correspond to Distance measurement value be updated to storage distance measurement value.

Distance measurement value corresponding to itself transmission data is updated to after the distance measurement value of storage by corresponding each ONU, corresponding each The upstream bandwidth of ONU response spare OLT distribution, line number is sent according to the distance measurement value after renewal in the upstream bandwidth of distribution According to.

In above-mentioned preferred embodiment, distance measurement value could be arranged to following one of any：Loop time delay value, balanced time delay Value and loop time；Physical channel could be arranged to following one of any：Wavelength, wavelength are to, subcarrier and subcarrier group.It is each Parameter it is specifically chosen as the case may be depending on.

To implement above preferred embodiment, based on same inventive concept, the embodiment of the present invention additionally provides a kind of passage and adjusted Engagement positions, be arranged in spare OLT, its structural representation as shown in figure 3, including：

First knows module 701, for knowing that active channel corresponding to the first primary OLT breaks down；

First adjusting module 702, lead to for physics corresponding to physical channel corresponding to itself is adjusted into the first primary OLT Road.

Based on same inventive concept, the embodiment of the present invention additionally provides another passage method of adjustment, its idiographic flow Figure is as shown in figure 8, including step S802 to step S804：

Step S802, the second primary OLT knows that active channel corresponding to the first primary OLT breaks down；

Step S804, the second primary OLT itself increases a physical channel, and increased physical channel is adjusted into first Physical channel corresponding to primary OLT.

In embodiments of the present invention, and it is not present exclusively for spare OLT standby primary OLT, as any one primary OLT When (the first primary OLT) breaks down, increase a new physics at itself by the second primary OLT equally as primary OLT Passage, increased physical channel is adjusted to physical channel corresponding to the first primary OLT, is first using increased physical channel Primary OLT provides active service.As can be seen here, in this example, the type of the newly-increased physical channels of the second primary OLT is have adjusted, For ONU sides, the physical channel that ONU is used does not change, and therefore, ONU need not do large variation, it is not required that change Become oneself state, it is only necessary to continue the physical channel of continuing.In OLT sides, can with flexibility select primary second OLT increases a physical channel, be adjusted to the primary OLT that breaks down corresponding to physical channel, it is mutual to realize primary OLT For spare OLT, and need not be that each OLT set a spare OLT, i.e. do not need 1 in OLT sides：1 protection, saving are set Standby cost.

The first primary OLT herein is used only for the primary OLT for specifying a certain specific, active channel to break down, and Second primary OLT is used only for being distinguished with the first primary OLT, and both do not produce restriction to OLT itself.

In above preferred embodiment, for ensure PON system can normal work, the second primary OLT can utilize poll System carries out fault inquiry to physical channel corresponding to remaining primary OLT in PON system successively, finds the first primary OLT in time Break down corresponding physical channel.Or, it is preferred that the second primary OLT can also use periodic queries mode, inquire about it Whether break down physical channel corresponding to remaining each primary OLT.Or another preferable mode, use timing issuer Formula inquire about remaining each primary OLT corresponding to physical channel whether break down.It is, of course, also possible to using other inquiry modes, It can ensure to find that physical channel corresponding to the first primary OLT is broken down in time, PON is being ensured just in order to provide alternate channel Often work.

Flow as shown in Figure 8, step S802 refer to that the second primary OLT knows work corresponding to the first primary OLT when implementing Broken down as path, it is contemplated that to know the difference of mode, can be generally divided into two kinds, one kind is actively to know, another It is passively to know.Passively know that mode includes：Second primary OLT receives at least one primary OLT or network management system sends Failure notification, know that active channel corresponding to the first primary OLT breaks down；And actively know that mode includes：Second primary OLT Remaining each primary OLT of active obtaining active channel state, know that active channel corresponding to the first primary OLT breaks down.

When being known using active mode, the second primary OLT can actively be communicated with other network elements or network management system into Row is known, specifically, second primary OLT active obtainings remaining each primary OLT active channel state, knows the first primary OLT Corresponding active channel breaks down.Another mode actively known can be that direct measurement is known, specifically, the second master When information exchange is not present between each optical network unit ONU with the primary OLT management of OLT and first, the second primary OLT will be certainly The newly-increased physical channel of body is adjusted to physical channel corresponding to the first primary OLT, if within a specified time, the second primary OLT warps Itself newly-increased physical channel does not receive upstream data, then knows that active channel corresponding to the first primary OLT breaks down.

During implementation, active channel corresponding to the first primary OLT, which breaks down, generally includes following reason：First primary OLT Transceiver malfunctions；Or first the optical fiber connected between the corresponding ONU of primary OLT break down.

Flow as shown in Figure 8, after implementation, i.e., increased physical channel is adjusted to step S804 by the second primary OLT After physical channel corresponding to first primary OLT, the second primary OLT ONU connections corresponding with the first primary OLT, establish and the Active channel corresponding to two primary OLT, and then the second primary OLT is primary by first by the business of ONU corresponding to the first primary OLT Active channel corresponding to OLT is switched to active channel corresponding to the second primary OLT.That is, the second primary OLT is working corresponding to it It is that ONU corresponding to the first primary OLT distributes upstream bandwidth on path, wherein, each ONU for being allocated upstream bandwidth is primary second Upstream data is sent in the upstream bandwidth of OLT distribution.Recover business between ONU and spare OLT.

Flow as shown in Figure 8, for step S802 before implementation, i.e., the second primary OLT knows work corresponding to the first primary OLT Before being broken down as path, the second primary OLT receives the status information that remaining each primary OLT is sent and deposited locally Storage, wherein, status information includes the ONU of remaining each primary OLT self-management passage relevant information and distance measurement result information

First way：The physical channel that itself is increased newly is adjusted to thing corresponding to remaining each primary OLT by the second primary OLT After managing passage, start to receive upstream data, and record the time for receiving upstream data；

Second primary OLT will receive the time announcement of upstream data to remaining each primary OLT, by remaining each primary OLT Calculate the distance measurement value between the second primary OLT and each ONU.

The second way：Second primary OLT obtains the time that remaining each primary OLT sends downlink data；

After the physical channel that itself is increased newly is adjusted to physical channel corresponding to remaining each primary OLT by the second primary OLT, open Begin to receive upstream data, and record the time for receiving upstream data；

Second primary OLT calculates itself distance measurement value between each ONU according to the time of acquisition and the time of record.

In implementation process, the second primary OLT needs to obtain each primary OLT transmissions downlink data second of distance measuring method Time, specific acquisition modes are：Second primary OLT receives sent by remaining each primary OLT, remaining each primary OLT and sent The time of downlink data；Or second primary OLT monitor the time that remaining each primary OLT sends downlink data.

Distance measurement value is being obtained using first way, i.e., the second primary OLT and each ONU are being calculated by remaining each primary OLT Between distance measurement value after, the second primary OLT receives and stored the distance measurement value that remaining each primary OLT is calculated；Or second master The distance measurement value that remaining each primary OLT calculates is received with OLT and corresponding each ONU, it is each primary that remaining is stored by corresponding each ONU The distance measurement value that OLT is calculated；

Distance measurement value is being obtained using the second way, i.e., the second primary OLT calculates according to the time for obtaining and recording After itself distance measurement value between each ONU, the second primary OLT notifies the distance measurement value calculated to give remaining each primary OLT, and leads to Cross each ONU corresponding to remaining primary OLT notice, the distance measurement value calculated by the second primary OLT of corresponding each ONU storages.

The first：Corresponding each ONU receives the downlink frame that the second primary OLT is sent, and it is corresponding that itself is sent into data immediately Distance measurement value be updated to storage distance measurement value；

Second：Corresponding each ONU receives the order for the renewal distance measurement value that the second primary OLT is sent, and immediately sends out itself Distance measurement value corresponding to data is sent to be updated to the distance measurement value of storage；

Distance measurement value corresponding to itself transmission data is updated to after the distance measurement value of storage by corresponding each ONU, corresponding each The upstream bandwidth of ONU response the second primary OLT distribution, sent according to the distance measurement value after renewal in the upstream bandwidth of distribution up Data.

To implement above preferred embodiment, based on same inventive concept, the embodiment of the present invention additionally provides a kind of passage and adjusted Engagement positions, be arranged in the second primary OLT, its structural representation as shown in figure 9, including：

Second knows module 901, for knowing that active channel corresponding to the first primary OLT breaks down；

Second adjusting module 902, for increasing a physical channel in the second primary OLT, and increased physics is led to Road is adjusted to physical channel corresponding to the first primary OLT.

Based on same inventive concept, the embodiment of the present invention additionally provides another passage method of adjustment, its idiographic flow Figure is as shown in Figure 10, including：

Step S1002, ONU judges whether receive downlink data in preset time；

If step S1004, judged result for it is no, finger that the physical channel of itself is adjusted to not break down by ONU Determine physical channel.

In embodiments of the present invention, the main body using ONU as operation, if ONU does not receive lower line number in preset time According to, then judge itself connection active channel break down, the specified thing that the physical channel of itself is adjusted to not break down Manage passage.In OLT sides, it simultaneously need not specify the passage for being to be connected with spare OLT to refer to determine physical channel, also not limit it Refer to determine physical channel with the primary OLT physical channels being connected, add the scope of selection, and need not be that each OLT is set Put a spare OLT, i.e. do not need 1 in OLT sides：1 protection, save equipment cost.

In a preferred embodiment, specified physical channel can include spare OLT transmission and receive what data used Physical channel, other transmission that can be used including the first primary OLT and the physical channel for receiving data, wherein, first is primary OLT is primary OLT corresponding to the ONU, can also include the primary OLT transmission of other in PON system and receive the thing that data use Passage (including the physical channel used and newly-increased physical channel) is managed, wherein, other primary OLT of primary OLT and first For different primary OLT.Certainly, the physical channel that specified physical channel may also provide through third party (non-OLT), can be realized Transmission and reception data.

During implementation, ONU can be adjusted operation according to own situation, can also be adjusted according to the OLT instructions sent Whole operation, according to the difference of specified physical channel, now arrange and give some instances, be explained.

Example A, by self transmission and receive the physical channel that uses of data and be adjusted to physics corresponding to the ONU when spare OLT After passage, the ONU receives the adjustment notice that spare OLT is sent, and the physical channel of itself is adjusted into spare OLT transmission and connect The physical channel that data use is received, or during the adjustment notice of ONU reception spare OLT transmissions, the physical channel of itself is adjusted The adjustment that spare OLT is sent is received for the first primary OLT other transmission used and the physical channel for receiving data, or ONU Notice, the physical channel of itself is adjusted to other primary OLT uses or newly-increased physical channel；

Other transmission and the physical channel of reception data that example B, the first primary OLT use itself are adjusted to this ONU pairs After the physical channel answered, the ONU receives the adjustment notice that the first primary OLT is sent, and the physical channel of itself is adjusted into the Other transmission and the physical channel of reception data that one primary OLT is used, or ONU receive the adjustment that the first primary OLT is sent Notice, the physical channel of itself is adjusted to spare OLT transmission and receives the physical channel that uses of data, or ONU receives the The adjustment notice that one primary OLT is sent, the physical channel of itself is adjusted to other primary OLT uses or newly-increased physics leads to Road；

After the physical channel that example C, other primary OLT will be used or increased newly is adjusted to physical channel corresponding to the ONU, ONU receives the adjustment notice that other primary OLT are initiated, and the physical channel of itself is adjusted into other primary OLT uses or increase newly Physical channel, or ONU receives the adjustment notice that other primary OLT are initiated, and the physical channel of itself is adjusted into spare OLT The physical channel that transmission and reception data use, or ONU receive the adjustment notice that other primary OLT are initiated, by the thing of itself Reason passage is adjusted to other transmission that the first primary OLT uses and the physical channel for receiving data.

Flow as shown in Figure 10, after step S1004, i.e. the physical channel of itself is adjusted to specify physical channel by ONU Afterwards, the distance measurement value that transmission data use is updated to the distance measurement value of corresponding specified physical channel by ONU.

In the present embodiment, ONU needs to update distance measurement value, then before the update, ONU will necessarily obtain the ranging after renewal Value.Its corresponding acquisition modes includes：ONU re-starts ranging, the distance measurement value after being updated；Or ONU receptions are each primary The distance measurement value that OLT or spare OLT are sent, as the distance measurement value of the corresponding OLT for sending distance measurement value active channel.

During implementation, when specified physical channel is that spare OLT sends and receives the physical channel that data use, distance measurement value can To be calculated as follows：

During implementation, when specifying physical channel to be the physical channel that the second primary OLT is connected with ONU, distance measurement value can be by such as Under type calculates：

To implement above preferred embodiment, based on same inventive concept, the embodiment of the present invention additionally provides a kind of passage and adjusted Engagement positions, it is arranged in ONU, its structural representation is as shown in figure 11, including：

Judge module 1101, for judging whether receive downlink data in preset time；

3rd adjusting module 1102, if the judged result for judge module 1101 is no, the physics of itself is led to Road is adjusted to the specified physical channel do not broken down.

It is clearer for the embodiment of the present invention is become apparent from illustrating, now it is described with specific embodiment.

Example one (GPON mechanism)

In the mixing PON as shown in Fig. 2 (c), the primary OLT in each work manages one group of ONU, spare OLT and ONU When there is no information exchange, according to other in running order primary OLT order to the ONU that primary OLT is managed corresponding standby (can also be that spare OLT notifies primary OLT oneself to need to master in other examples with ranging on OLT stand-by channel With ONU rangings on the stand-by channel of corresponding spare OLT of OLT management).

Ranging process is as follows：The wavelength of the reception data of oneself (can also be sub- load in other embodiments by spare OLT Ripple or subcarrier group) be arranged to above-mentioned work OLT receive data wavelength (can also be in other embodiments subcarrier or Person's subcarrier group).Primary OLT is by self-administered all ONU passage relevant information such as ONU ONU-ID, T-CONT, sequence Number information, gigabit method for packing port-mark and all ONU are sent to standby in the balanced time delay value (EqD) of master channel OLT, spare OLT is synchronous with the primary OLT retention times, and spare OLT monitors primary OLT and sends downlink frame to ONU, and records transmission The time T1 and primary OLT of downlink frame allow the time (StartTime) of ONU transmission uplink frames, (in other examples Can be that T1 and StartTime values are sent to spare OLT by primary OLT), after ONU receives distance measurement request, wait corresponding to itself EqD (can also carry out ranging, now without storage EqD's at ONU to the ONU for registering state of activation in other examples Between, value between this is changed to random delay value) time and distance measurement request distribution StartTime after response ranging response. The reception time T2 that spare OLT monitors the uplink frame that primary OLT receives ONU transmissions (can also be in other examples T2 value is sent to spare OLT by primary OLT), spare OLT records above-mentioned T2 value, and records and oneself receive ONU transmissions Reception time T3 during uplink frame, spare OLT calculate that oneself EqD values EqD between the ONU is standby to be：

EqD is standby=standby-(T2-T1)+EqD+StartTime-of EqDmax (1+i descending/i up) × (T3-T2)

Wherein, the standby maximum EqD values for alternate channel of EqDmax, EqD are in running order ONU in master channel On the EqD time value that measures, the refractive index of the up light of the upper behaviors of i in a fiber, the refraction of the descending light of behavior in a fiber under i Rate.

Spare OLT obtains an ONU of work OLT management after the EqD backed-up values of stand-by channel, obtains the ONU standby With the EqD of path is standby and the EqD of primary path difference Δ=standby-EqD of EqD, according to above-mentioned Δ, the work can be obtained All ONU of OLT management in stand-by channel EqD backed-up values, its value be primary path EqD values and above-mentioned Δ value and, i.e., EqD is standby=EqD+ Δs.

Spare OLT is sent to primary OLT by EqD is standby, and primary OLT is sent to corresponding ONU by above-mentioned EqD is standby.ONU Store the standby values of the EqD.

When spare OLT does not have information exchange between ONU, spare OLT will receive the wavelength of upstream data (in other realities Applying in example can also be subcarrier or subcarrier group) wavelength of other primary OLT receptions upstream datas is adjusted to (in other realities Applying in example can also be subcarrier or subcarrier group) upstream data is received afterwards, interior between predetermined, spare OLT receives up After data, continue to adjust the wavelength (can also be subcarrier or subcarrier group in other embodiments) for receiving upstream data After the wavelength (can also be subcarrier or subcarrier group in other embodiments) of upstream data being received for another primary OLT Upstream data is received, spare OLT repeats said process.When spare OLT will receive the wavelength of upstream data (in other embodiments Can also be subcarrier or subcarrier group) it is adjusted to the wavelength of some primary OLT receptions upstream data (in other embodiments Can also be subcarrier or subcarrier group) after a period of time in do not receive upstream data, then spare OLT judges some OLT Corresponding active channel cisco unity malfunction (or spare OLT does not receive upstream data within a period of time, then with corresponding master Communicated with OLT and obtain its corresponding active channel whether being capable of normal work), if spare OLT determines certain through the above way Corresponding to individual primary OLT during active channel cisco unity malfunction, spare OLT will receive the wavelength of upstream data (in other implementations Can also be subcarrier or subcarrier group in example) wavelength of primary OLT receptions upstream data is adjusted to (in other embodiment In can also be subcarrier or subcarrier group), and by send downlink data wavelength (can also be in other embodiments son Carrier wave or subcarrier group) to be adjusted to the primary OLT to send the wavelength of downlink data (can also be sub- load in other embodiments Ripple or subcarrier group), based on distribution upstream bandwidths of the T-CONT to the ONU of the primary OLT management, ONU receives standby spare OLT After OLT downlink frame, the EqD values that the EqD values of oneself are stand-by channel, ONU responses are updated according to the identity information of spare OLT The upstream bandwidth of spare OLT distribution, distributed according to EqD corresponding to the stand-by channel after renewal to oneself in spare OLT up Upstream data is sent in bandwidth.

ONU updates the EqD values that the EqD values of oneself are stand-by channel according to the identity information of spare OLT in the present embodiment, After the order for updating distance measurement value that spare OLT is sent can also be used in other examples, oneself is sent into data immediately Corresponding distance measurement value is updated to the distance measurement value of stand-by channel；Or after ONU does not receive downlink frame within a period of time, actively will be certainly Distance measurement value corresponding to oneself transmission data is updated to the distance measurement value of stand-by channel.

It is OLT in the present embodiment by that (can also be subcarrier or son in other embodiments in different wavelength Carrier wave set) on receive upstream data confirm active channel corresponding to the wavelength whether normal work, in other examples The OLT of work can be used, and in its corresponding active channel cisco unity malfunction, notice spare OLT will receive data and transmission The wavelength (can also be subcarrier or subcarrier group in other embodiments) of data is adjusted to wavelength corresponding to oneself (at it Can also be subcarrier or subcarrier group in his embodiment) communicated instead of oneself with corresponding ONU.

It is calculating of the spare OLT completion to ranging process in the present embodiment, can also uses in other examples Spare OLT by receive upstream data physical channel be adjusted to other OLT receive upstream data physical channel after receive it is up Data, and record and receive time of upstream data, spare OLT will receive the time announcement of upstream data to other OLT, by Other OLT calculate the distance measurement value between spare OLT and ONU and notify to store above-mentioned distance measurement value to spare OLT, spare OLT；Or Person notifies to store standby distance measurement value to spare OLT and ONU, ONU.

Spare OLT has one group of Receiver And Transmitter in the present embodiment, can have at OLT in other examples more Spare OLT in the method for work and the present embodiment of individual Receiver And Transmitter, every group of receiver and tunable emitter The method of work of one group of Receiver And Transmitter is identical.

Example two (EPON mechanism)

In mixing PON as shown in Figure 5, the primary OLT in each work manages one group of ONU, and spare OLT and ONU do not have When having information exchange, according to other in running order primary OLT order to the ONU that primary OLT is managed corresponding standby Ranging (can also be that spare OLT notifies primary OLT oneself to need to primary in other examples on OLT stand-by channel The ONU of OLT management rangings on the stand-by channel of corresponding spare OLT).Ranging process is as follows：Spare OLT is by the reception number of oneself According to wavelength (can also be subcarrier or subcarrier group in other embodiments) be arranged to above-mentioned work OLT and receive data Wavelength (can also be subcarrier or subcarrier group in other embodiments).Primary OLT leads to self-administered all ONU's Balanced time delay value loop times of road relevant information such as ONU LLID, Media access contorl address and all ONU in master channel (Round Trip Time, abbreviation RTT) is sent to spare OLT, and spare OLT is synchronous with the primary OLT retention times, spare OLT prison Primary OLT is listened to send downlink frame to ONU, and the time T0 for recording transmission downlink frame (can also be main in other examples T0 values are sent to spare OLT with OLT), it is T0 by the time stamp setting of oneself after ONU receives distance measurement request, should in time T1 Answer ranging response.Spare OLT monitors primary OLT and receives the reception time T2 for the uplink frame that ONU is sent (in other embodiments In can also be that T2 value is sent to spare OLT by primary OLT), spare OLT records above-mentioned T2 value, and record oneself receive Reception time T2 ' during the uplink frame sent to ONU, spare OLT calculate oneself RTT value between the ONU and are：

RTT is standby=2 × T2 '-T1-T2

Spare OLT obtains an ONU of work OLT management after the RTT values of stand-by channel, obtains the ONU standby logical The RTT on road is standby and the RTT of primary path difference Δ=standby-RTT of RTT, according to above-mentioned Δ, can obtain work OLT pipes All ONU of reason in stand-by channel RTT backed-up values, its value be primary path RTT values and above-mentioned Δ value and, i.e., RTT is standby With=RTT+ Δs.Spare OLT stores the standby values of above-mentioned EqD.

When spare OLT does not have information exchange between ONU, spare OLT will receive the wavelength of upstream data (in other realities Applying in example can also be subcarrier or subcarrier group) wavelength of other primary OLT receptions upstream datas is adjusted to (in other realities Applying in example can also be subcarrier or subcarrier group) receive upstream data afterwards, after spare OLT receives upstream data, continue by It is primary that the wavelength (can also be subcarrier or subcarrier group in other embodiments) of reception upstream data is adjusted to another The wavelength (can also be subcarrier or subcarrier group in other embodiments) that OLT receives upstream data receives up number afterwards According to spare OLT repeats said process.When spare OLT by receive upstream data wavelength (can also be in other embodiments son Carrier wave or subcarrier group) to be adjusted to some primary OLT to receive the wavelength of upstream data (can also be son in other embodiments Carrier wave or subcarrier group) after do not receive upstream data within a period of time, then spare OLT judges work corresponding to some OLT Path cisco unity malfunction (or spare OLT does not receive upstream data within a period of time, then is communicated with corresponding primary OLT Whether obtain its corresponding active channel being capable of normal work), if spare OLT determines some primary OLT through the above way During corresponding active channel cisco unity malfunction, the wavelength for receiving upstream data (in other embodiments can also by spare OLT Subcarrier or subcarrier group) be adjusted to the primary OLT and receive the wavelength of upstream data (can also be in other embodiments Subcarrier or subcarrier group), and (can also be subcarrier or son in other embodiments by the wavelength of transmission downlink data Carrier wave set) to be adjusted to the primary OLT to send the wavelength of downlink data (can also be that subcarrier or son carry in other embodiments Ripple group), spare OLT gives the ONU of primary OLT management distribution upstream bandwidth based on LLID and ONU in the RTT of stand-by channel, ONU sends upstream data in the upstream bandwidth that spare OLT is distributed to oneself.

It is calculating of the spare OLT completion to ranging process in the present embodiment, can also uses in other examples Spare OLT by receive upstream data physical channel be adjusted to other OLT receive upstream data physical channel after receive it is up Data, and record and receive time of upstream data, spare OLT will receive the time announcement of upstream data to other OLT, by Other OLT calculate the distance measurement value between spare OLT and ONU and notify to store above-mentioned distance measurement value to spare OLT, spare OLT.

As can be seen from the above description, the present invention realizes following technique effect：

In embodiments of the present invention, exist exclusively for spare OLT standby primary OLT, as any one primary OLT ( One primary OLT) when breaking down, physical channel corresponding to itself is directly adjusted to corresponding to the first primary OLT by spare OLT Physical channel.As can be seen here, in this example, the type of physical channel is directly have adjusted, for ONU sides, the thing of ONU connections The type for managing passage does not change, and therefore, ONU need not do large variation, it is not required that changes oneself state, it is only necessary to after Continued access continues the physical channel.In OLT sides, the physical channel of oneself with flexibility can be adjusted to occur by spare OLT Physical channel corresponding to the primary OLT of failure, and need not be that each OLT sets a spare OLT, i.e. it is not required in OLT sides Want 1：1 protection, save equipment cost.

In embodiments of the present invention, and it is not present exclusively for spare OLT standby primary OLT, as any one primary OLT When (the first primary OLT) breaks down, increase a new physics at itself by the second primary OLT equally as primary OLT Passage, increased physical channel is adjusted to physical channel corresponding to the first primary OLT, is first using increased physical channel Primary OLT provides active service.As can be seen here, in this example, the type of the newly-increased physical channels of the second primary OLT is have adjusted, For ONU sides, the type of the physical channel of ONU connections does not change, and therefore, ONU need not do large variation, also not Need to change oneself state, it is only necessary to continue the physical channel of continuing.In OLT sides, can with flexibility select Two primary OLT increase a physical channels, be adjusted to the primary OLT that breaks down corresponding to physical channel, realize master With OLT spare OLTs, and need not be that each OLT sets a spare OLT each other, i.e. do not need 1 in OLT sides：1 guarantor Shield, save equipment cost.

In embodiments of the present invention, the main body using ONU as operation, if ONU does not receive lower line number in preset time According to, then judge itself connection active channel break down, the specified thing that the physical channel of itself is adjusted to not break down Manage passage.As can be seen here, in this example, in OLT sides, itself and need not to specify the passage for being to be connected with spare OLT be specified Physical channel, it is not limited yet and refers to determine physical channel with the primary OLT physical channels being connected, adds the scope of selection, and Need not be that each OLT sets a spare OLT, i.e. do not need 1 in OLT sides：1 protection, save equipment cost.

Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies Change, equivalent substitution, improvement etc., should be included in the scope of the protection.

Claims

A kind of 1. passage method of adjustment, it is characterised in that including：

Standby optical line terminal OLT knows that active channel corresponding to the first primary OLT breaks down；

Physical channel corresponding to itself is adjusted to physical channel corresponding to the described first primary OLT by the spare OLT.
2. according to the method for claim 1, it is characterised in that

The spare OLT knows that active channel corresponding to the described first primary OLT breaks down, including：

The failure notification that the spare OLT receives at least one primary OLT or network management system is sent, knows that described first is primary Active channel breaks down corresponding to OLT；Or

The active channel state of each primary OLT of spare OLT active obtaining, know and worked corresponding to the described first primary OLT Path breaks down.
3. according to the method for claim 2, it is characterised in that the work of each primary OLT of spare OLT active obtaining is led to Line state, know that active channel corresponding to the described first primary OLT breaks down, including：

When information exchange being not present between the spare OLT and each optical network unit ONU, the spare OLT is corresponding by itself Physical channel be adjusted to physical channel corresponding to the described first primary OLT, if within a specified time, the spare OLT through adjust Physical channel after whole does not receive upstream data, then knows that active channel corresponding to the described first primary OLT breaks down；Or Person

The spare OLT is communicated with the described first primary OLT or the network management system, knows the described first primary OLT Corresponding active channel breaks down.
4. according to the method for claim 1, it is characterised in that the spare OLT adjusts physical channel corresponding to itself After physical channel corresponding to the described first primary OLT, in addition to：

Spare OLT ONU connections corresponding with the described first primary OLT, establish work corresponding with the spare OLT and lead to Road；

The spare OLT works as corresponding to the described first primary OLT the business of ONU corresponding to the described first primary OLT logical Switch to active channel corresponding to the spare OLT on road.
5. according to the method for claim 1, it is characterised in that the spare OLT is known to work corresponding to the first primary OLT Before path breaks down, including：

The spare OLT receives the status information that each primary OLT is sent, wherein, the status information includes each primary OLT itself The ONU of management passage relevant information and distance measurement result information；

The spare OLT stores the status information.
6. according to the method for claim 5, it is characterised in that

The passage relevant information includes at least one following：Each ONU mark ONU-ID, logical links label L LID, transmission Container T-CONT, sequence number information, Media access contorl address and gigabit method for packing port-mark；

The distance measurement result information includes：Distance measurement value between the spare OLT and each ONU.
7. according to the method for claim 6, it is characterised in that each ONU is stored with the ranging corresponding to the spare OLT During value,

Each ONU receives the downlink frame that the spare OLT is sent corresponding to described, and itself is sent into distance measurement value corresponding to data immediately It is updated to the distance measurement value of storage；Or

Each ONU corresponding to described receives the order for the renewal distance measurement value that the spare OLT is sent, and itself is sent into data pair immediately The distance measurement value answered is updated to the distance measurement value of storage；Or

Each ONU corresponding to described does not receive downlink frame in preset time, then itself actively is sent into ranging corresponding to data Value is updated to the distance measurement value of storage.
8. the method according to claim 6 or 7, it is characterised in that the distance measurement value is following one of any：Loop time delay Value, balanced time delay value and loop time.
9. according to the method described in any one of claim 1 to 7, it is characterised in that the physical channel is following one of any： Wavelength, wavelength are to, subcarrier and subcarrier group.
A kind of 10. passage method of adjustment, it is characterised in that including：

Second primary optical line terminal OLT knows that active channel corresponding to the first primary OLT breaks down；

The second primary OLT itself increases a physical channel, and it is primary that increased physical channel is adjusted into described first Physical channel corresponding to OLT.
11. according to the method for claim 10, it is characterised in that the second primary OLT knows that the first primary OLT is corresponding Active channel break down, including：

Second failure notification that primary OLT receives at least one primary OLT or network management system is sent, knows described first Active channel corresponding to primary OLT breaks down；Or

Remaining each primary OLT of second primary OLT active obtainings active channel state, knows described first primary OLT pairs The active channel answered breaks down.
12. according to the method for claim 11, it is characterised in that remaining is each primary for the second primary OLT active obtainings OLT active channel state, know that active channel corresponding to the described first primary OLT breaks down, including：

Information exchange is not present between the second primary OLT and each optical network unit ONU of the first primary OLT management When, the physical channel that itself is increased newly is adjusted to physical channel corresponding to the described first primary OLT by the second primary OLT, if Within a specified time, the physical channel that the described second primary OLT is increased newly through itself does not receive upstream data, then knows described the Active channel corresponding to one primary OLT breaks down；Or

The second primary OLT is communicated with the described first primary OLT or the network management system, knows that described first is primary Active channel breaks down corresponding to OLT.
13. according to the method for claim 10, it is characterised in that the second primary OLT knows that the first primary OLT is corresponding Active channel break down before, including：

The second primary OLT receives the status information that remaining each primary OLT is sent, wherein, the status information includes remaining The ONU of each primary OLT self-managements passage relevant information and distance measurement result information；

The second primary OLT stores the status information；

Wherein, the passage relevant information includes at least one following：Each ONU mark ONU-ID, logical links label L LID, Transmit container T-CONT, sequence number information, Media access contorl address and gigabit method for packing port-mark；

The distance measurement result information includes：Distance measurement value between the second primary OLT and each ONU.
14. according to the method for claim 13, it is characterised in that when each ONU storages institute corresponding to the described second primary OLT When stating distance measurement value,

Each ONU corresponding to described receives the downlink frame that the described second primary OLT is sent, and itself will send survey corresponding to data immediately The distance measurement value of storage is updated to away from value；Or

Each ONU corresponding to described receives the order for the renewal distance measurement value that the described second primary OLT is sent, and itself is sent into number immediately The distance measurement value of storage is updated to according to corresponding distance measurement value；Or

Each ONU corresponding to described does not receive downlink frame in preset time, then itself actively is sent into ranging corresponding to data Value is updated to the distance measurement value of storage.
15. the method according to claim 13 or 14, it is characterised in that the distance measurement value is following one of any：Loop Time delay value, balanced time delay value and loop time.
16. according to the method described in any one of claim 10 to 14, it is characterised in that the physical channel for it is following it is any it One：Wavelength, wavelength are to, subcarrier and subcarrier group.
A kind of 17. passage method of adjustment, it is characterised in that including：

Optical network unit ONU judges whether receive downlink data in preset time；

If judged result is no, the physical channel of itself is adjusted to the non-specified physical channel broken down by the ONU.
18. according to the method for claim 17, it is characterised in that the specified physical channel includes：

The physical channel that standby optical line terminal OLT transmission and reception data use；Or

Other transmission and the physical channel of reception data that first primary OLT is used, wherein, the first primary OLT is described Primary OLT corresponding to ONU；Or

Other primary OLT in passive optical network PON system are used or newly-increased physical channel, wherein, other described primary OLT It is different primary OLT from the described first primary OLT.
19. according to the method for claim 17, it is characterised in that the physical channel of itself is adjusted to non-hair by the ONU The specified physical channel of raw failure, including：

When spare OLT by self transmission and receive the physical channel that uses of data be adjusted to physical channel corresponding to the ONU it Afterwards, the ONU receives the adjustment notice that the spare OLT is sent, and the physical channel of itself is adjusted into the spare OLT transmits The physical channel used with reception data, or the ONU receive the adjustment notice that the spare OLT is sent, by the thing of itself Reason passage is adjusted to other transmission that the described first primary OLT uses and the physical channel for receiving data, or the ONU is received The adjustment notice that the spare OLT is sent, the physical channel of itself is adjusted to other described primary OLT uses or newly-increased thing Manage passage；

It is corresponding that other transmission and the physical channel of reception data that the first primary OLT uses itself are adjusted to the ONU Physical channel after, the ONU receives the adjustment notice that the described first primary OLT is sent, and the physical channel of itself is adjusted First master is received for the described first primary OLT other transmission used and the physical channel for receiving data, or the ONU The adjustment sent with OLT is notified, the physical channel of itself is adjusted into the physics that the spare OLT is transmitted and reception data use Passage, or the ONU receive the adjustment notice that the described first primary OLT is sent, and the physical channel of itself is adjusted into described Other primary OLT are used or newly-increased physical channel；

It is described after the physical channel that other described primary OLT will be used or increased newly is adjusted to physical channel corresponding to the ONU ONU receives the adjustment notice that other described primary OLT are initiated, and the physical channel of itself is adjusted into other described primary OLT makes With or newly-increased physical channel, or the ONU receives the adjustment notice that other described primary OLT are initiated, by the physics of itself Passage is adjusted to the spare OLT transmission and receives the physical channel that data use, or other are primary described in ONU receptions The adjustment notice that OLT is initiated, the physical channel of itself is adjusted to other transmission and the reception number that the described first primary OLT is used According to physical channel.
20. according to the method described in any one of claim 17 to 19, it is characterised in that

After the physical channel of itself is adjusted to the specified physical channel do not broken down by the ONU, including：The ONU will Send the distance measurement value that the distance measurement value that data use is updated to the corresponding specified physical channel；

The distance measurement value that transmission data use is updated to before the distance measurement value of the corresponding specified physical channel by the ONU, including： The ONU re-starts ranging, the distance measurement value after being updated；Or the ONU receives each primary OLT or described standby The distance measurement value that OLT is sent, as the distance measurement value of the corresponding OLT for sending distance measurement value active channel.
21. a kind of optical line terminal OLT, it is characterised in that the OLT, be arranged to know that work is logical corresponding to the first primary OLT Break down on road；Physical channel corresponding to itself is adjusted to physical channel corresponding to the described first primary OLT.
22. a kind of optical line terminal OLT, it is characterised in that the OLT, be arranged to know that work is logical corresponding to the first primary OLT Break down on road；Increase a physical channel, and increased physical channel is adjusted to physics corresponding to the described first primary OLT Passage.
23. a kind of optical network unit ONU, it is characterised in that the ONU, be arranged to judge under whether receiving in preset time Row data；If the judged result of the judge module for it is no, finger that the physical channel of itself is adjusted to not break down Determine physical channel.
24. a kind of passage adjusts system, including：Optical network unit ONU and optical line terminal OLT,

The ONU, it is arranged to judge whether receive downlink data in preset time；If the judged result of the judge module is When no, then the physical channel of itself is adjusted to the specified physical channel do not broken down；

The OLT, it is arranged to know that active channel corresponding to the first primary OLT breaks down；Increase a physical channel, and will Increased physical channel is adjusted to physical channel corresponding to the described first primary OLT；Or it is arranged to judge in preset time Whether downlink data is received；If the judged result of the judge module is no, the physical channel of itself is adjusted to not send out The specified physical channel of raw failure.