CN101154996B - Optical network unit and its access method, optical line terminal and passive optical network system - Google Patents
Optical network unit and its access method, optical line terminal and passive optical network system Download PDFInfo
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- CN101154996B CN101154996B CN 200610140150 CN200610140150A CN101154996B CN 101154996 B CN101154996 B CN 101154996B CN 200610140150 CN200610140150 CN 200610140150 CN 200610140150 A CN200610140150 A CN 200610140150A CN 101154996 B CN101154996 B CN 101154996B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/2587—Arrangements specific to fibre transmission using a single light source for multiple stations
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Abstract
The present invention relates to the field of optical fiber communication, especially relates to a optical network unit and a connecting method, a optical line terminal and a passive optical network system thereof, which are used to prolong the service lifetime of the laser, reduce the power consumption, save the electrical energy and reduces the calorific value of the equipment. In the invention OLT periodically transmits the descending light signal to the ONU in the off-lining state; and the off-lining ONU transmits the network connecting request tot the OLT reusing the descending light signal. The technical scheme of the invention has the advantages of prolonging the service lifetime of the descending laser in the passive optical network system, saving the electrical energy, reducing the power consumption and reducing the calorific value of the equipment, thereby the whole capability of the OLT is increased.
Description
Technical field
The present invention relates to fiber optic communication field, relate in particular to a kind of optical network unit and cut-in method thereof, optical line terminal and passive optical network.
Background technology
Along with the continuous growth of user to bandwidth demand, traditional copper cash broadband access system more and more faces bandwidth bottleneck; Meanwhile, the Fibre Optical Communication Technology that bandwidth capacity is huge is increasingly mature, and application cost descends year by year, and Optical Access Network becomes the strong competitor of broadband access network of future generation, and is wherein especially more competitive with EPON.Fig. 1 shows the general structure of PON (Passive Optical Network, EPON) system.Usually; A passive optical network comprises an OLT (Optical Line Terminal who is positioned at the central office; Optical line terminal); ODN (Optical Distribution Network, optical distribution network) and some ONU (Optical Network Unit, optical network unit) that is used for branch/coupling or multiplex/demultiplex.According to the difference that PON realizes, PON can be divided into different types, is based on ATM (Asynchronous Transfer Mode respectively; Asynchronous transfer mode) ATM-PON; Based on the EPON (Ethernet over PON) of Ethernet (Ethernet), has the GPON (Gigabit Passive Optical Network, gigabit speed EPON) of gigabit speed; Adopt WDM (Wave Division Multiplexing; Wavelength division multiplexing) WDM-PON, and the OCMDA-PON that adopts OCDMA (Optical Code Division Multiple Addressing, optical code division multiple access).
At present, in numerous Optical Access Network solutions, WDM-PON is owing to the advantages such as Information Security of its more huge bandwidth capacity, similarity point to-point communication receive much concern.But than Optical Access Networks such as EPON, GPON, the WDM-PON cost is very high, is that it can not actual commercial biggest obstacle.Wherein, light source is to the maximum factor of cost impact among the WDM-PON.In order to reduce the light source cost of WDM-PON, various solutions have appearred, like DFBLA (Distributed FeedBack Laser Array; The distributed feedback laser array), spectral line is cut apart light source, MFL (Multi-Frequency Laser; Multimode laser), injection locking FP-LD (Fabry-Perot) laser of incoherent light, RSOA (Reflective Semiconductor Optical Amplifier; The reflective semiconductor amplifier), tunable laser heavily uses downlink optical signal etc.
In above-mentioned many low-cost light source solutions; Heavily using downlink optical signal is wherein a kind of important way, and its basic thought is ONU the downlink optical signal separated into two parts from OLT that receives, and a part is used to recover downlink data; Another part downlink optical signal is used to inject external modulator or injection locking FP-LD or RSOA; And modulate into this part downlink optical signal to upstream data, send it back OLT, thereby realize the heavily use of downlink optical signal.
The use downlink optical signal is thought highly of through external modulation by a kind of WDM-PON of the prior art system; ONU is the downlink optical signal separated into two parts; Part light is delivered to detector (detector), is used to recover downlink data, and another part light is given outside modulator (modulator); Be used to carry upstream data, the new transfer of laying equal stress on is returned OLT.
Another kind of WDM-PON of the prior art system heavily uses downlink optical signal through outside RSOA; ONU is the downlink optical signal separated into two parts; Part light is delivered to receiver (receiver) or detector, is used to recover downlink data, and another part light is given outside RSOA; Through being used to carry upstream data after reflection, amplification, the modulation, the new transfer of laying equal stress on is returned OLT.
Heavily use the WDM-PON of downlink optical signal; Because the transmission of ONU upstream data places one's entire reliance upon whether downlink optical signal is arranged, therefore have following problem: after the ONU off-line, OLT will stop the transmission of downlink data; And because re-powering of ONU has randomness; OLT also can't know when ONU reaches the standard grade, and when ONU need reach the standard grade again, will can't normally not insert the WDM-PON network because there being downlink optical signal.At present; After the ONU off-line, OLT is the same in the time of can be online with ONU continuously to send downlink optical signal to ONU, to address the above problem; Make ONU can obtain the downlink optical signal that OLT sends at any time and normally insert the WDM-PON network; It is thus clear that the last laser of OLT also will continuously send downlink optical signal to it in the ONU off-line, this can shorten laser useful life inevitably, increase power load, waste electric energy and increase the heat radiation difficulty.
Summary of the invention
In the prior art, the last laser of OLT also will continuously send downlink optical signal to it in the ONU off-line, and this can shorten laser useful life inevitably, increase power load, waste electric energy and increase the heat radiation difficulty.
Therefore; In order to solve life-span, reduction power consumption, saves energy that prolongs downstream laser and the technical problem that reduces the equipment heating amount; The present invention provides a kind of optical network unit and cut-in method, optical line terminal and passive optical network; Wherein, the invention provides the method for the optical network unit to access network in a kind of Wave division multiplexing passive optical network WDM-PON system, may further comprise the steps:
The optical network unit ONU of the off-line state that optical line terminal OLT periodically identifies in the ONU of its maintenance state table is sent downlink optical signal;
Off-lining ONU heavily uses said downlink optical signal to send the network insertion request to OLT;
Wherein, ONU generates the network insertion request message, and downlink optical signal is monitored in beginning in real time; Receive the downlink optical signal that OLT periodically issues, be divided into two parts, generate the network insertion request message when having detected downstream signal and send indication according to the part downlink optical signal; Said network insertion request message is modulated in the remainder downlink optical signal except that said part downlink optical signal, and sends to OLT.
Further, said method also can have the off-lining ONU transmission downlink optical signal that following characteristics: OLT periodically identifies in the ONU of its maintenance state table.
Further, said method also can have following characteristics: OLT the cycle that first timer is monitored the downlink optical signal of said periodicity transmission is set, and concrete grammar comprises:
After first timer was overtime each time, OLT inquired about said ONU state table, and in said ONU state table, was designated off-lining ONU transmission downlink optical signal.
Further, said method also can have following characteristics: OLT and regularly or behind the said ONU state table of the each modification of OLT inquire about said ONU state table, and the cycle that second timer is monitored the downlink optical signal of said periodicity transmission is set, and concrete grammar comprises:
OLT inquires not exist in the said ONU state table and closes second timer when being designated off-lining ONU; Inquire once more and open second timer when occurring being designated off-lining ONU in the said ONU state table;
Be in the second timer of opening overtime each time after, all are designated off-lining ONU and send downlink optical signal OLT in said ONU state table.
Further, said method also can have following characteristics: during the said ONU state table of said OLT inquiry regularly, OLT is provided with its regular time interval of the said ONU state table of inquiry of the 3rd timer monitoring.
Further, said method also can have following characteristics: said OLT safeguards that the method for ONU state table comprises:
When among the PON during newly-increased ONU, OLT adds said ONU in said ONU state table, and the status indicator that said ONU is set is an off-line state;
Receive the access request of ONU as OLT after, the status indicator that OLT revises ONU described in the said ONU state table is non-off-line state;
When ONU off-line or registration were unsuccessful, the status indicator that OLT revises ONU described in the said ONU state table was an off-line state.
Further, said method also can have following characteristics: the downlink optical signal that said periodicity is sent is the inquiry light signal, and said inquiry light signal comprises identification information;
Off-lining ONU is after generating the network insertion request message; Whether inquire about light signal according to whether comprising the downlink optical signal that said identification information judgment receives; When said downlink optical signal is the inquiry light signal, heavily use said inquiry light signal to send the network insertion request of said ONU.
Further, said method also can have following characteristics: the said cycle is to wait long period or discrete periodic.
The present invention also provides a kind of WDM passive optical network system, comprises optical line terminal OLT, optical distribution network and optical network unit ONU,
Said OLT comprises memory module, cycle module, control module and first sending module, and said memory module is used to preserve the ONU state table, identifies off-lining ONU; Said cycle module knows whether there is off-lining ONU according to said ONU state table, and when having off-lining ONU, periodically triggers said control module; Said control module is sent downlink optical signal through said first sending module to off-lining ONU according to said triggering;
Said ONU comprises inserting asks generation module and processing module; Said access request generation module generates the network insertion request message and exports to said processing module when off-lining ONU needs access network, said processing module heavily uses the downlink optical signal that receives to send the network insertion request to OLT;
Said processing module comprises second receiving element, processing unit and second transmitting element, wherein:
Said access request generation module is exported to said second transmitting element after generating the network insertion request message, and indicates said processing unit to begin to monitor in real time downlink optical signal;
Said second receiving element receives the downlink optical signal that OLT periodically issues, and the part downlink optical signal is exported to said processing unit, and the remainder downlink optical signal is exported to said second transmitting element;
Said processing unit inserts request message according to said part downlink optical signal to the said second transmitting element output network when having detected downstream signal and sends indication after the indication that receives said access request generation module;
Said second transmitting element is modulated to said network insertion request message in the said remainder downlink optical signal that receives, and sends to OLT after receiving said transmission indication.
The present invention also provides the optical line terminal in a kind of Wave division multiplexing passive optical network WDM-PON system, comprises memory module, cycle module, control module and first sending module, wherein:
Memory module is used to preserve the ONU state table, identifies off-lining ONU;
Said cycle module knows whether there is off-lining ONU according to said ONU state table, and when finding to have off-lining ONU, periodically triggers said control module;
Said control module indicates said first sending module to send downlink optical signal to off-lining ONU according to said triggering;
Wherein, ONU generates the network insertion request message, and downlink optical signal is monitored in beginning in real time; Receive the downlink optical signal that OLT periodically issues, be divided into two parts, generate the network insertion request message when having detected downstream signal and send indication according to the part downlink optical signal; Said network insertion request message is modulated in the remainder downlink optical signal except that said part downlink optical signal, and sends to OLT.
Further, above-mentioned optical line terminal also can have following characteristics: said optical line terminal also comprises memory module, is used to preserve the ONU state table, identifies off-lining ONU;
Said cycle module knows whether there is off-lining ONU according to said ONU state table;
Said control module is sent downlink optical signal according to said ONU state table to off-lining ONU.
Further, above-mentioned optical line terminal also can have following characteristics: said cycle module comprises the first timer and first query unit, wherein:
First timer triggers said first query unit in overtime back each time, and said first query unit is inquired about said ONU state table, and when existing in the said ONU state table when being designated off-lining ONU, said first query unit triggers said control module.
Further, above-mentioned optical line terminal also can have following characteristics: said optical line terminal also comprises first receiver module and maintenance module, wherein:
When among the PON during newly-increased ONU, said maintenance module adds said ONU in said ONU state table, and the status indicator that said ONU is set is an off-line state;
Receive the access request of ONU when said first receiver module after, the status indicator that said maintenance module is revised ONU described in the said ONU state table is non-off-line state;
When ONU off-line or registration were unsuccessful, the status indicator that OLT revises ONU described in the said ONU state table was an off-line state.
Further, above-mentioned optical line terminal also can have following characteristics: said cycle module comprises the second timer and second query unit, wherein:
Said second query unit regularly or behind the said ONU state table of the each modification of said maintenance unit is inquired about said ONU state table, in inquiring said ONU state table, does not exist and closes second timer when being designated off-lining ONU; Inquire once more and open second timer when occurring being designated off-lining ONU in the said ONU state table;
Be in the second timer of opening overtime each time after, trigger said control module.
Further, above-mentioned optical line terminal also can have following characteristics: said cycle module also comprises the 3rd timer, wherein:
Said second query unit is triggered in the overtime each time back of the 3rd timer, makes in inquiring said ONU state table, not have the said second query unit said ONU state table of inquiry regularly and close second timer when being designated off-lining ONU; Inquire once more and open second timer when occurring being designated off-lining ONU in the said ONU state table;
Be in the second timer of opening overtime each time after, trigger said control module.
The present invention also provides the optical network unit in a kind of Wave division multiplexing passive optical network WDM-PON system, and said optical network unit comprises and insert request generation module and processing module, wherein:
Said access request generation module generates the network insertion request message and exports to said processing module when the optical network unit ONU of off-line state needs access network;
The downlink optical signal that said processing module heavily uses the optical line terminal OLT that receives periodically to issue sends the network insertion request to OLT;
Said processing module comprises second receiving element, processing unit and second transmitting element, wherein:
Said access request generation module is exported to said second transmitting element after generating the network insertion request message, and indicates said processing unit to begin to monitor in real time downlink optical signal;
Said second receiving element receives the downlink optical signal that OLT periodically issues, and the part downlink optical signal is exported to said processing unit, and the remainder downlink optical signal is exported to said second transmitting element;
Said processing unit inserts request message according to said part downlink optical signal to the said second transmitting element output network when having detected downstream signal and sends indication after the indication that receives said access request generation module;
Said second transmitting element is modulated to said network insertion request message in the said remainder downlink optical signal that receives, and sends to OLT after receiving said transmission indication.
Further; Above-mentioned optical network unit also can have following characteristics: said processing unit is used for monitoring downlink optical signal in real time according to the indication of said access request generation module, and when detecting downlink optical signal, inserts request message to the said second transmitting element output network and send indication.
Further, above-mentioned optical network unit also can have following characteristics: said processing unit comprises resolves subelement and judgment sub-unit, wherein:
Said access request generation module is exported to said second transmitting element after generating the network insertion request message, and indicates said judgment sub-unit to begin to monitor in real time downlink data;
Said second receiving element receives downlink optical signal, and the part downlink optical signal is exported to said parsing subelement, and the remainder downlink optical signal is exported to said second transmitting element;
Said parsing subelement recovers downlink data from the part downlink optical signal that receives, and exports to said judgment sub-unit;
Said judgment sub-unit is after the indication that receives said access request generation module; Whether comprise the identification information of inquiring about light signal in the downlink data of the said parsing subelement output of monitoring in real time; When comprising said identification information, insert request message to the said second transmitting element output network and send indication.
Beneficial effect of the present invention is following:
Among the present invention, OLT periodically sends downlink optical signal to the optical network unit ONU of off-line state; Off-lining ONU heavily uses this downlink optical signal to send the network insertion request to OLT.Adopt technical scheme of the present invention; After the ONU off-line; OLT need not continuously send downlink optical signal to ONU, and can prolong useful life, saves energy, the reduction power consumption of downstream laser in the passive optical network and reduce the equipment heating amount, thus the overall performance of raising OLT.
Description of drawings
Fig. 1 is the structural representation of passive optical network;
Fig. 2 is the flow chart of the method in the cycle of first kind of monitoring transmission downlink optical signal of OLT in the embodiment of the invention;
Fig. 3 is the flow chart of the method in the cycle of second kind of monitoring transmission downlink optical signal of OLT in the embodiment of the invention;
Fig. 4 is the flow chart of ONU access network in the embodiment of the invention;
Fig. 5 is the passive optical network structural representation of the embodiment of the invention;
Fig. 6 is the structural representation of the OLT in the embodiment of the invention;
Fig. 7 is first kind of structural representation of OLT in the embodiment of the invention;
Fig. 8 is second kind of structural representation of OLT in the embodiment of the invention;
Fig. 9 is the third structural representation of OLT in the embodiment of the invention;
Figure 10 is the structured flowchart of ONU among the present invention;
Figure 11 is the structured flowchart of ONU in one embodiment of the present of invention;
Figure 12 is the structured flowchart of ONU in the instance of the present invention.
Embodiment
Core concept of the present invention is: OLT periodically sends downlink optical signal to off-lining ONU; Off-lining ONU heavily uses this downlink optical signal to send the network insertion request to OLT.
This cycle can be to be to wait long period or discrete periodic in the cycle, is that example describes to wait long period below.
Receive the network insertion request of this ONU as OLT after, continuously send downlink optical signal to this ONU, and carry out the access registration flow process of this ONU, when this ONU registration failure or off-line, OLT no longer continuously sends downlink optical signal to this ONU.
Below in conjunction with accompanying drawing and embodiment the present invention is done to describe further.
Passive optical network in the present embodiment is as shown in Figure 1, comprises OLT, ODN and some ONU, and on OLT, safeguarding has an ONU state table; The on-line state of all ONU among the PON at sign OLT place; Specifically as shown in table 1, comprise that ONU numbers and two contents of status indicator of corresponding ONU, in the present embodiment;, the value of status indicator representes that corresponding ONU is non-off-line state when being 1; Specifically comprise online (promptly accomplishing registration, normally the state of transceive data) or just at login state, the value of status indicator is to represent corresponding ONU off-line at 0 o'clock.
Table 1
| The ONU numbering | Status indicator (1 representative is online, and 0 represents off-line) |
| 1 | 0 |
| 2 | 1 |
| ... | ... |
| n | 1 |
Maintenance to the ONU state table comprises:
1, when among the PON during newly-increased ONU, OLT adds the numbering of this ONU in the ONU state table, and the status indicator that this ONU is set is 0;
The user is after its new ONU handles the formality of opening network, and the network manager is with adding a list item, the numbering of wherein preserving this new ONU in the ONU state table of preserving at OLT; This numbering can be the device id of this new ONU; And because this ONU is new when adding PON, it necessarily is in off-line state; Therefore, the status indicator that this ONU is set in the ONU state table is an off-line state.
2, after OLT receives the access request of ONU, the status indicator that OLT revises this ONU in the ONU state table is 1;
3, when ONU off-line or registration were unsuccessful, the status indicator that OLT revises this ONU in the ONU state table was 0.
In the present embodiment, OLT periodically is designated off-lining ONU and sends downlink optical signal in the ONU state table.
In the concrete realization of present embodiment, OLT has the method in the cycle of three kinds of monitoring transmission downlink optical signals:
First method:
OLT is provided with the cycle of first timer monitoring transmission downlink optical signal; First timer is opened always; After first timer is overtime each time, OLT inquiry ONU state table, and in the ONU state table, be designated off-lining ONU transmission downlink optical signal; This method is specially after first timer is overtime, carries out following steps as shown in Figure 2:
Step S101, whether OLT inquiry ONU state table exists is designated off-lining ONU, if carry out step S102; Otherwise OLT does not process, and directly finishes;
In the present embodiment, concrete inquiry mode does, the value of the status indicator of all ONU in the ONU state table is carried out and operation; Because the value of status indicator is 0 or 1; And when the value of status indicator is 1, represent that corresponding ONU is online, the value of status indicator is to represent corresponding ONU off-line at 0 o'clock, therefore; As long as have the value of the status indicator of an ONU be 0 all ONU status indicator value with operating result be 0, exist in the expression ONU state table to be designated off-lining ONU; Correspondingly, if with operating result be 1, explain that then all ONU are online.
In concrete the realization, whether whether the value of status indicator that also can be through inquiring about ONU one by one be 0 to know to exist in the ONU state table and be designated off-lining ONU.
Step S102, OLT are designated off-lining ONU and send downlink optical signal in the ONU state table.
Second method:
OLT is provided with second timer; Be used to indicate OLT to be in off-lining ONU and send downlink optical signal to all; Promptly under the situation that second timer is opened, it is overtime each time all will to cause OLT all will be designated off-lining ONU and sends downlink optical signal in the ONU state table.
Send in the method in cycle at OLT monitoring downlink optical signal; OLT monitors the ONU state table in real time, and concrete grammar is all inquired about whole state table for after OLT revises the ONU state table each time; And whether open second timer according to Query Result decision; With the cycle of monitoring transmission downlink optical signal, the flow process of this inquiry and processing is as shown in Figure 3, may further comprise the steps:
Whether step S201 exists in the OLT inquiry ONU state table to be designated off-lining ONU, if carry out step S202, otherwise carry out step S204;
Step S202 judges whether the second timer current states is unlatching, if, do not process, directly finish; Otherwise carry out step S203;
Step S203 opens second timer, finishes;
Step S204 judges whether the second timer current states is for opening, if carry out step S205; Otherwise do not process, directly finish;
Step S205 closes second timer.
It is thus clear that through above-mentioned flow process, OLT inquires not exist in the ONU state table and closes second timer when being designated off-lining ONU; Inquire once more and open second timer when occurring being designated off-lining ONU in the ONU state table.And when second timer was opened, after it was overtime each time, all were designated off-lining ONU transmission downlink optical signal to OLT in the ONU state table.
The third method:
OLT also is provided with the 3rd timer being provided with on the basis of above-mentioned second timer, and the monitoring that downlink optical signal sends the cycle is accomplished in second timer and the 3rd timer collaborative work.Wherein, the 3rd timer is opened always, is used to monitor the cycle of OLT inquiry ONU state table, and indication OLT inquires about the ONU state table and determines whether to open second timer according to Query Result; Second timer is used to indicate OLT to be in off-lining ONU transmission downlink optical signal to all; Promptly under the situation that second timer is opened, it is overtime each time all will to cause OLT all will be designated off-lining ONU and sends downlink optical signal in the ONU state table.
Above-mentioned each length of timer can be provided with experience as required; Generally, to make the imperceptible tangible stand-by period of user on the one hand, on the other hand by the factor decision of two aspects; Downstream laser is opened continually, sent downlink optical signal to off-lining ONU.
Thus it is clear that, in the above-mentioned maintenance, when increasing ONU newly among the PON to the ONU state table; The status indicator that this ONU is set is an off-line state; Like this can be so that when increasing ONU newly among the PON, OLT can inquire to exist in the ONU state table and be designated off-lining ONU, sends downlink optical signal thereby periodically be designated off-lining ONU to all; Certainly wherein also comprise the ONU that this is newly-increased, make newly-increased ONU can normally insert PON.
Describe in the face of the method for ONU access network down.Adopt a table to discern off-line state
When ONU was in off-line state, OLT periodically sent downlink optical signal to ONU.The downlink optical signal that OLT sends during the ONU off-line; Can distinguish to some extent with the continuous downlink optical signal that OLT sends during ONU registers or be online; The beginning that is embodied in this downlink optical signal partly comprises identification information; For narrating conveniently; Be referred to as downlink optical signal that OLT sends and that comprise identification information in the beginning part among the present invention for inquiring about light signal during the ONU off-line, the identification information of inquiring about in the light signal is used to point out ONU: use immediately following the light signal after this identification information and send the network insertion request message.The data of inquiry optical signals AD HOC are modulated generation to laser, and the length of inquiry light signal must guarantee that ONU can accomplish the transmission of its network insertion request message.When off-lining ONU will insert PON, carry out following steps as shown in Figure 4:
After step S301, ONU power on or reset, generate the network insertion request message;
Step S302, ONU receive and resolve downlink optical signal;
Step S303, ONU judge whether this light signal inquires about light signal, if, carry out step S304, otherwise, directly finish;
When concrete the realization, ONU parses data by the light signal that receives, and then these data is inquired about the coupling of light signal identification information, if mate successfully, thinks that then what receive is to inquire about light signal, otherwise thinks that what receive is not to inquire about light signal.
Step S304, ONU is modulated to its network insertion request message immediately following in the light signal after identification information, and sends it back OLT;
Step S305, OLT continuously provide downlink optical signal to this ONU after receiving the network insertion request of this ONU;
Step S306, OLT carry out the access registration flow process of this ONU according to the network insertion request message of this ONU.
If in register flow path, this ONU registration failure, then OLT can stop to send downlink optical signal continuously to it, and the status indicator of this ONU is 0 in the modification ONU state table.
OLT can be in the PON at its place ONU in all online and registrations downlink optical signal (when no downlink data transmission, will send idle frame) continuously is provided, till ONU off-line or registration failure.
When concrete the realization; OLT also can periodically send the downlink optical signal that does not comprise identification information to ONU; Be that OLT periodically is not necessarily to inquire about light signal to what ONU sent, but when online with ONU or when registration identical downlink optical signal or the downlink optical signal of the sufficient length of extended formatting.In this case, in a single day the ONU that network insertion request message to be sent such as is in has detected downlink optical signal, just immediately its network insertion request message is modulated in the subsequent optical signal, and sends it back OLT.
PON system in the present embodiment is as shown in Figure 5, comprises OLT, ODN and some ONU, wherein:
OLT comprises cycle module 101, control module 102 and first sending module 103, cycle module 101 trigger control module 102 periodically when having off-lining ONU; Control module 102 triggers through first sending module 103 according to this and sends downlink optical signal to off-lining ONU;
ONU comprises inserting asks generation module 201 and processing module 202; Insert request generation module 201 and when off-lining ONU needs access network, generate the network insertion request and export to processing module 202, processing module 202 heavily uses the downlink optical signal that receives to send the network insertion request to OLT.
OLT in the PON system in the present embodiment is as shown in Figure 6, comprises cycle module 101, control module 102, first sending module 103, memory module 104, maintenance module 105 and first receiver module 106, wherein:
In the present embodiment, control module 102 is directly inquired about the ONU that the ONU state table finds all off-lines, but in practical implementation, control module 102 also can be known the ONU of all off-lines from cycle module 101.
First sending module 103 is used to receive the transmission indication from control module, on the corresponding modulation reflector, sends one section downlink optical signal;
When among the PON during newly-increased ONU, maintenance module 105 adds ONU in the ONU state table, and the status indicator that ONU is set is an off-line state;
Receive the access request of ONU when first receiver module 106 after, the status indicator that maintenance module 105 is revised this ONU in the ONU state table is non-off-line state;
When ONU off-line or registration were unsuccessful, the status indicator that OLT revises this ONU in the ONU state table was an off-line state.
Corresponding to the method in cycle of above-mentioned three kinds of monitoring transmission downlink optical signals, OLT can have three kinds of structures in the present embodiment, and its first kind of structure is as shown in Figure 7, and cycle module 101 comprises the first timer 107 and first query unit 108, wherein:
Trigger first query unit 108 in the overtime each time back of first timer 107; First query unit, 108 inquiry ONU state tables; When not existing in the ONU state table when being designated off-lining ONU, first query unit 108 does not process, and waits for the overtime next time of first timer 107;
When existence in the ONU state table is designated off-lining ONU, first query unit, 108 trigger control module 102.
Second kind of structure of OLT is as shown in Figure 8, and cycle module 101 comprises the second timer 109 and second query unit 110, wherein:
Maintenance unit is revised after the ONU state table at every turn, all triggers second query unit, 110, the second query unit 110 according to triggering inquiry ONU state table, in inquiring the ONU state table, does not exist and closes second timer 109 when being designated off-lining ONU; Open second timer 109 when in inquiring the ONU state table, occurring being designated off-lining ONU;
Be in the second timer 109 of opening overtime each time after, trigger control module 102.
The third structure of OLT is as shown in Figure 9, and cycle module 101 comprises second timer 109, the 3rd timer 111 and second query unit 110, wherein:
The 3rd timer 111 is opened always, and overtime each time back is triggered second query unit, 110, the second query unit 110 and triggered inquiry ONU state table according to this, in inquiring the ONU state table, does not exist and closes second timer 109 when being designated off-lining ONU; Inquire once more and open second timer 109 when occurring being designated off-lining ONU in the ONU state table;
Be in the second timer 109 of opening overtime each time after, trigger control module 102.
Judge for the ease of ONU whether the downlink optical signal that receives can be used to send the network insertion request, the downlink optical signal that OLT periodically sends can be the inquiry light signal.
ONU in the PON system among the present invention, shown in figure 10, comprise and insert request generation module 201 and processing module 202, wherein:
Insert request generation module 201, generate the network insertion request message when being used for after off-lining ONU re-powers or resets, needing access network and export to processing module 202;
ONU in one embodiment of the present of invention is shown in figure 11, comprises inserting request generation module 201 and processing module 202, and processing module 202 comprises second receiving element 203, processing unit 205 and second transmitting element 204, wherein:
Insert request generation module 201, generate the network insertion request message when being used for after off-lining ONU re-powers or resets, needing access network and export to second transmitting element 204, indicate processing unit 205 beginnings monitoring downlink optical signal in real time simultaneously;
Second receiving element 203; Be used to receive the downlink optical signal that OLT periodically issues; The part downlink optical signal is exported to processing unit 205; Be used for the monitoring of downlink data recovery and downlink optical signal, the remainder downlink optical signal is exported to second transmitting element 204, be used to supply second transmitting element 204 heavily to be used in the transmission of upstream data bag;
Second transmitting element 204 is used for after the transmission indication that receives arrival place second receiving element 203, will from the network insertion request message of access request generation module 201 be modulated in the downlink optical signal that receives, and send to OLT.
In an instance of this enforcement; Processing unit 205 is used for beginning to monitor in real time having or not of downlink optical signal according to the indication that inserts request generation module 201; In case detect downlink optical signal, then send indication to network insertion request message of second transmitting element, 204 outputs.
Corresponding to the OLT that sends the inquiry light signal to off-lining ONU, the ONU in another instance of present embodiment is shown in figure 12, and processing unit 205 comprises resolves subelement 206 and judgment sub-unit 207, wherein:
Insert request generation module 201, generate the network insertion request message when being used for after off-lining ONU re-powers or resets, needing access network and export to second transmitting element 204, indicate judgment sub-unit 207 beginnings monitoring downlink data in real time simultaneously;
Second receiving element 203; Be used to receive the downlink optical signal that OLT periodically issues; The part downlink optical signal is exported to parsing subelement 206; Be used for the monitoring that downlink data recovers and inquire about light signal, the remainder downlink optical signal is exported to second transmitting element 204, be used to supply second transmitting element 204 heavily to be used in the transmission of upstream data bag;
Second transmitting element 204 is used for after the transmission indication that receives judgment sub-unit 207 outputs, will being modulated in the downlink optical signal from the network insertion request message that inserts request generation module 201, and sending to OLT.
Adopt technical scheme of the present invention; Both can guarantee that ONU was linked into PON in real time, randomly; Can avoid OLT continuously to send downlink optical signal again to ONU; Prolong useful life, saves energy, the reduction power consumption of downstream laser and reduce the equipment heating amount, thereby improve the overall performance of OLT.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1. the method for the optical network unit to access network in the Wave division multiplexing passive optical network WDM-PON system is characterized in that, may further comprise the steps:
The optical network unit ONU of the off-line state that optical line terminal OLT periodically identifies in the ONU of its maintenance state table is sent downlink optical signal;
Off-lining ONU heavily uses said downlink optical signal to send the network insertion request to OLT;
Wherein, ONU generates the network insertion request message, and downlink optical signal is monitored in beginning in real time; Receive the downlink optical signal that OLT periodically issues, be divided into two parts, generate the network insertion request message when having detected downstream signal and send indication according to the part downlink optical signal; Said network insertion request message is modulated in the remainder downlink optical signal except that said part downlink optical signal, and sends to OLT.
2. the method for claim 1 is characterized in that, OLT is provided with the cycle that first timer is monitored the downlink optical signal of said periodicity transmission, and concrete grammar comprises:
After first timer was overtime each time, OLT inquired about said ONU state table, and in said ONU state table, was designated off-lining ONU transmission downlink optical signal.
3. the method for claim 1 is characterized in that, OLT regularly or behind the said ONU state table of the each modification of OLT inquires about said ONU state table, and the cycle that second timer is monitored the downlink optical signal of said periodicity transmission is set, and concrete grammar comprises:
OLT inquires not exist in the said ONU state table and closes second timer when being designated off-lining ONU; Inquire once more and open second timer when occurring being designated off-lining ONU in the said ONU state table;
Be in the second timer of opening overtime each time after, all are designated off-lining ONU and send downlink optical signal OLT in said ONU state table.
4. method as claimed in claim 3 is characterized in that, during the said ONU state table of said OLT inquiry regularly, OLT is provided with its regular time interval of the said ONU state table of inquiry of the 3rd timer monitoring.
5. the method for claim 1 is characterized in that, said OLT safeguards that the method for ONU state table comprises:
When among the PON during newly-increased ONU, OLT adds said ONU in said ONU state table, and the status indicator that said ONU is set is an off-line state;
Receive the access request of ONU as OLT after, the status indicator that OLT revises ONU described in the said ONU state table is non-off-line state;
When ONU off-line or registration were unsuccessful, the status indicator that OLT revises ONU described in the said ONU state table was an off-line state.
6. the method for claim 1 is characterized in that, the downlink optical signal that said periodicity is sent is the inquiry light signal, and said inquiry light signal comprises identification information;
Off-lining ONU is after generating the network insertion request message; Whether inquire about light signal according to whether comprising the downlink optical signal that said identification information judgment receives; When said downlink optical signal is the inquiry light signal, heavily use said inquiry light signal to send the network insertion request of said ONU.
7. the method for claim 1 is characterized in that, the said cycle is to wait long period or discrete periodic.
8. a WDM passive optical network system comprises optical line terminal OLT, optical distribution network and optical network unit ONU, it is characterized in that,
Said OLT comprises memory module, cycle module, control module and first sending module, and said memory module is used to preserve the ONU state table, identifies off-lining ONU; Said cycle module knows whether there is off-lining ONU according to said ONU state table, and when having off-lining ONU, periodically triggers said control module; Said control module is sent downlink optical signal through said first sending module to off-lining ONU according to said triggering;
Said ONU comprises inserting asks generation module and processing module; Said access request generation module generates the network insertion request message and exports to said processing module when off-lining ONU needs access network, said processing module heavily uses the downlink optical signal that receives to send the network insertion request to OLT;
Said processing module comprises second receiving element, processing unit and second transmitting element, wherein:
Said access request generation module is exported to said second transmitting element after generating the network insertion request message, and indicates said processing unit to begin to monitor in real time downlink optical signal;
Said second receiving element receives the downlink optical signal that OLT periodically issues, and the part downlink optical signal is exported to said processing unit, and the remainder downlink optical signal is exported to said second transmitting element;
Said processing unit when having detected downstream signal according to said part downlink optical signal, inserts request message to the said second transmitting element output network and sends indication after the indication that receives said access request generation module;
Said second transmitting element is modulated to said network insertion request message in the said remainder downlink optical signal that receives, and sends to OLT after receiving said transmission indication.
9. the optical line terminal in the Wave division multiplexing passive optical network WDM-PON system is characterized in that, comprises memory module, cycle module, control module and first sending module, wherein:
Memory module is used to preserve the ONU state table, identifies off-lining ONU;
Said cycle module knows whether there is off-lining ONU according to said ONU state table, and when finding to have off-lining ONU, periodically triggers said control module;
Said control module indicates said first sending module to send downlink optical signal to off-lining ONU according to said triggering;
Wherein, ONU generates the network insertion request message, and downlink optical signal is monitored in beginning in real time; Receive the downlink optical signal that OLT periodically issues, be divided into two parts, generate the network insertion request message when having detected downstream signal and send indication according to the part downlink optical signal; Said network insertion request message is modulated in the remainder downlink optical signal except that said part downlink optical signal, and sends to OLT.
10. optical line terminal as claimed in claim 9 is characterized in that said optical line terminal also comprises memory module, is used to preserve the ONU state table, identifies off-lining ONU;
Said cycle module knows whether there is off-lining ONU according to said ONU state table;
Said control module is sent downlink optical signal according to said ONU state table to off-lining ONU.
11. optical line terminal as claimed in claim 10 is characterized in that, said cycle module comprises the first timer and first query unit, wherein:
First timer triggers said first query unit in overtime back each time, and said first query unit is inquired about said ONU state table, and when existing in the said ONU state table when being designated off-lining ONU, said first query unit triggers said control module.
12. optical line terminal as claimed in claim 10 is characterized in that, said optical line terminal also comprises first receiver module and maintenance module, wherein:
When among the PON during newly-increased ONU, said maintenance module adds said ONU in said ONU state table, and the status indicator that said ONU is set is an off-line state;
Receive the access request of ONU when said first receiver module after, the status indicator that said maintenance module is revised ONU described in the said ONU state table is non-off-line state;
When ONU off-line or registration were unsuccessful, the status indicator that OLT revises ONU described in the said ONU state table was an off-line state.
13. optical line terminal as claimed in claim 12 is characterized in that, said cycle module comprises the second timer and second query unit, wherein:
Said second query unit regularly or behind the said ONU state table of the each modification of said maintenance module is inquired about said ONU state table, in inquiring said ONU state table, does not exist and closes second timer when being designated off-lining ONU; Inquire once more and open second timer when occurring being designated off-lining ONU in the said ONU state table;
Be in the second timer of opening overtime each time after, trigger said control module.
14. optical line terminal as claimed in claim 13 is characterized in that, said cycle module also comprises the 3rd timer, wherein:
Said second query unit is triggered in the overtime each time back of the 3rd timer, makes in inquiring said ONU state table, not have the said second query unit said ONU state table of inquiry regularly and close second timer when being designated off-lining ONU; Inquire once more and open second timer when occurring being designated off-lining ONU in the said ONU state table;
Be in the second timer of opening overtime each time after, trigger said control module.
15. the optical network unit in the Wave division multiplexing passive optical network WDM-PON system is characterized in that, said optical network unit comprises and inserts request generation module and processing module, wherein:
Said access request generation module generates the network insertion request message and exports to said processing module when the optical network unit ONU of off-line state needs access network;
The downlink optical signal that said processing module heavily uses the optical line terminal OLT that receives periodically to issue sends the network insertion request to OLT;
Said processing module comprises second receiving element, processing unit and second transmitting element, wherein:
Said access request generation module is exported to said second transmitting element after generating the network insertion request message, and indicates said processing unit to begin to monitor in real time downlink optical signal;
Said second receiving element receives the downlink optical signal that OLT periodically issues, and the part downlink optical signal is exported to said processing unit, and the remainder downlink optical signal is exported to said second transmitting element;
Said processing unit when having detected downstream signal according to said part downlink optical signal, inserts request message to the said second transmitting element output network and sends indication after the indication that receives said access request generation module;
Said second transmitting element is modulated to said network insertion request message in the said remainder downlink optical signal that receives, and sends to OLT after receiving said transmission indication.
16. optical network unit as claimed in claim 15; It is characterized in that; Said processing unit is used for monitoring downlink optical signal in real time according to the indication of said access request generation module, and when detecting downlink optical signal, inserts request message to the said second transmitting element output network and send indication.
17. optical network unit as claimed in claim 15 is characterized in that, said processing unit comprises resolves subelement and judgment sub-unit, wherein:
Said access request generation module is exported to said second transmitting element after generating the network insertion request message, and indicates said judgment sub-unit to begin to monitor in real time downlink data;
Said second receiving element receives downlink optical signal, and the part downlink optical signal is exported to said parsing subelement, and the remainder downlink optical signal is exported to said second transmitting element;
Said parsing subelement recovers downlink data from the part downlink optical signal that receives, and exports to said judgment sub-unit;
Said judgment sub-unit is after the indication that receives said access request generation module; Whether comprise the identification information of inquiring about light signal in the downlink data of the said parsing subelement output of monitoring in real time; When comprising said identification information, insert request message to the said second transmitting element output network and send indication.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610140150 CN101154996B (en) | 2006-09-30 | 2006-09-30 | Optical network unit and its access method, optical line terminal and passive optical network system |
| PCT/CN2007/002749 WO2008037178A1 (en) | 2006-09-30 | 2007-09-18 | The optical network unit and its accessing method, the optical line terminal and the passive optical network system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200610140150 CN101154996B (en) | 2006-09-30 | 2006-09-30 | Optical network unit and its access method, optical line terminal and passive optical network system |
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| CN101154996A CN101154996A (en) | 2008-04-02 |
| CN101154996B true CN101154996B (en) | 2012-07-11 |
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| WO (1) | WO2008037178A1 (en) |
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| KR100971676B1 (en) * | 2008-10-09 | 2010-07-22 | 한국과학기술원 | A Fault Localization Method and A Fault Localization Apparatus in A Passive Optical Network and A Passive Optical Network Having the Same |
| JP4700094B2 (en) * | 2008-10-24 | 2011-06-15 | 株式会社日立製作所 | Optical access system and optical line device |
| CN101938677B (en) * | 2010-09-25 | 2012-12-12 | 索尔思光电（成都）有限公司 | 10G EPON (Ethernet Passive Optical Network) single-fiber bidirectional energy-saving optical module |
| CN102723988B (en) * | 2012-06-12 | 2015-06-03 | 迈普通信技术股份有限公司 | Control method and communication device of optical module |
| CN105323662B (en) * | 2012-10-12 | 2018-11-02 | 青岛海信宽带多媒体技术有限公司 | Passive optical network and its Low-power-consumptiocontrol control method and optical network unit |
| CN103905111A (en) * | 2012-12-28 | 2014-07-02 | 深圳市华为安捷信电气有限公司 | Optical link detection method, optical link detection device and optical link detection system |
| CN110300038A (en) * | 2018-03-23 | 2019-10-01 | 中兴通讯股份有限公司 | A kind of communication means of smart home device, line card, equipment and storage medium |
| CN109104343B (en) * | 2018-09-30 | 2021-01-26 | 四川长虹电器股份有限公司 | Optimization method for PON fusion type gateway STB (set top box) equipment service establishment |
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| KR100421151B1 (en) * | 2002-01-17 | 2004-03-04 | 삼성전자주식회사 | Method for implementation procedure in giga bit ethernet passive optical network and ethernet frame structure thereof |
| CN1186889C (en) * | 2002-01-25 | 2005-01-26 | 北京润光泰力科技发展有限公司 | Method for respectively treating diffevent state grade subscriber in ethernet passive optical network |
| US7545813B2 (en) * | 2003-08-26 | 2009-06-09 | Teknovus, Inc. | Method and apparatus for registering multiple remote nodes in an ethernet passive optical network |
| KR100498954B1 (en) * | 2003-08-27 | 2005-07-04 | 삼성전자주식회사 | Apparatus and method for tracking optical wavelength in wavelength division multiplexed passive optical network using loop-back light source |
| KR100617708B1 (en) * | 2004-06-11 | 2006-08-28 | 삼성전자주식회사 | Optical transmitter and passive optical network using the same |
| US20060140641A1 (en) * | 2004-12-29 | 2006-06-29 | Brolin Stephen J | Avoiding ONU laser by optical modulation and remodulation |
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| WO2008037178A1 (en) | 2008-04-03 |
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