CN100384123C - Kilomega passive optical network system - Google Patents
Kilomega passive optical network system Download PDFInfo
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- CN100384123C CN100384123C CNB2005100645500A CN200510064550A CN100384123C CN 100384123 C CN100384123 C CN 100384123C CN B2005100645500 A CNB2005100645500 A CN B2005100645500A CN 200510064550 A CN200510064550 A CN 200510064550A CN 100384123 C CN100384123 C CN 100384123C
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Abstract
The present invention discloses a kilomega passive optical network system. The present invention comprises an optical network line terminal and a plurality of optical network units/optical network terminals, wherein optical receiving modules in the optical network line terminals and optical transmitting modules in the optical network units/optical network terminals use optical modules with the burst time less than 512 ns; lead codes of data frames encapsulated by the optical network units/optical network terminals are arranged in predetermined length for adapting to the burst time of the optical modules. The present invention has the advantages of low required cost and simple system realization.
Description
Technical field
The present invention relates to passive optical network (PON, Passive Optical Network), in particular, the present invention relates to a kind of Gigabit Passive Optical Network (GPON, Gigabit PON) system.
Background technology
The PON technology is the light access technology of getting up to the application development of multiple spot for support point, general, the PON system is by optical line terminal (OLT, Optical Line Termination), network unit/optical network terminal (ONU/ONT, Optical Network Unit/Optical Network Termination) and Optical Distribution Network (ODN, Optical Distribution Network) form.Its substantive characteristics is that ODN all is made up of passive device, and it is more flexible that passive characteristic makes that network lays, and need not machine room and power supply etc.; Share the characteristic of optical fiber and can save a large amount of fiber resources, make that the Access Network line cost is lower; And the structure of pure smooth medium, transparent fiber broadband network makes to the following professional fail safe that has kept technology of expanding.
The PON technology is since being born, difference according to data link layer protocol, be divided into APON (based on ATM), BPON (based on ATM), GPON (based on ATM and GEM), GEPON (based on Ethernet), wherein the APON technology is the most ripe, but professional providing capability is limited, cost performance is low, can't satisfy long-range development, only satisfy the access demand of some specific region at present; The advantage of EPON/GEPON is simply, at a high speed, low-cost, the user is wide, and technology, the relative GPON of product want ripe, its problem that need solve is the maturity that develops skill, and further reduces cost; The advantage of GPON is transparent transmission, high-speed and high-efficiency, carrier grade service, is the trend of technical development.
In the existing GPON system, when having light signal to send, the light drive circuit working point is because factors such as circuit capacitances from no light signal for optical module, the working point set up need be certain settling time; Simultaneously, laser shutdown also needs the time.Circuit common is set up and the turn-off time is the mS magnitude, and circuit reaches the uS magnitude after improving.Reach the work of nS magnitude, need higher difficulty, also need to adopt some control new technologies, therefore, some index requests of every raising, its technology and cost price are all higher.
Burst reception difficulty for light burst receiver module is then bigger, except that sending the similar reason,, be difficult to more realize that burst receives also because the dynamic range of light-receiving is bigger owing to above-mentioned burst, under the situation that satisfies the light input dynamic range, its burst time index needs more time.
In addition, receive among the OLT and need from data, produce clock recovery fast, as in several Bit datas, obtaining recovered clock.Burst clock recovery (BCDR, Burst CDR) needs to adopt complicated new technology, needs higher technical costs.Such as, it need adopt the chip technology of more speed, needs new implementation method etc.At present, also can not meet the requirements of commercial product.Realize this fast B CDR, have only the higher high performance device of some price of employing to design.
To sum up, owing to the light burst time and the light-receiving of the optical module that light is sent, receives are had relatively high expectations settling time, during as transmission 1.24416Gbit/s signal, require ONU/ONT to require less than 12ns fall time; The OLT distal process is sent out the settling time of reception less than 36ns.The GPON system cost that realizes is higher at present, and the system design difficulty is bigger.
Summary of the invention
The technical problem that the present invention solves provides a kind of kilomega passive optical network system, to reduce the cost that the GPON system realizes, reduces the system design difficulty.
For addressing the above problem, kilomega passive optical network system of the present invention, it includes the optical network line terminal, and a plurality of optical network units or Optical Network Terminal, Optical Receivers in the wherein said optical network line terminal, and the optical transmission module in optical network unit or the Optical Network Terminal adopts the optical module of burst time less than 512ns; And
The lead code of the Frame of described optical network unit or Optical Network Terminal encapsulation is configured to predetermined length, to adapt to the described optical module burst time.
Optimize, described optical module is the optical module of Ethernet passive optical network EPON.
Optionally, the lead code by following manner configuration optical network unit or Optical Network Terminal is a predetermined length:
The optical network line terminal is a predetermined length by the lead code that its control and management passage OMCI to optical network unit or Optical Network Terminal is provided with the uplink frame data of optical network unit or Optical Network Terminal; Or
Optical network unit or Optical Network Terminal fixed configurations lead code are predetermined length; Or
The optical network line terminal is a predetermined length by the lead code that service channel is provided with the uplink frame data of optical network unit or Optical Network Terminal; Or
Optionally, optical line terminal, optical network unit or Optical Network Terminal are by software arrangements lead code predetermined length.
Optionally, optical line terminal sends data with broadcast mode to optical network unit or Optical Network Terminal.
Optionally, described optical network unit or Optical Network Terminal are determined by matching addresses and are handled the data that receive.
Optionally, described optical network unit or Optical Network Terminal adopt time division multiple access protocol to transmit data to described optical line terminal.
Compared with prior art, the present invention has following beneficial effect:
The present invention can adopt the bigger optical module of dynamic range in OLT and ONU/ONT (light burst time＜512ns) is carried out data transmit-receive, (be network unit/optical network terminal with network unit/optical network terminal simultaneously, down together) lead code of the Frame of encapsulation is configured to predetermined length, to adapt to the described optical module burst time, can guarantee that data correctly receive and dispatch, compatible expensive and optical module cheaply, system's realization is simpler;
In addition, in the GPON system, can adopt Ethernet passive optical network (EPON in a preferred embodiment of the invention, Ethemet Passive Optical Network) optical module, can satisfy of the burst time requirement of GPON system to optical module, simultaneously because the optical module cost of EPON network is lower, system realizes that technology is more ripe, and the present invention realizes that than prior art system cost is lower, and system design is simpler.
Description of drawings
Fig. 1 is the composition schematic diagram of GPON of the present invention system;
Fig. 2 is a GPON system data frame structure;
Fig. 3 is a GPON system uplink T-CONT internal data frame structure;
Fig. 4 is that the present invention increases the principle schematic that lead code Preamble length guarantees Data Receiving.
Embodiment
With reference to figure 1, this figure is the composition schematic diagram of GPON of the present invention system.
As shown, the GPON system is made up of with the one group of related ONU/ONT that is positioned at client an OLT who is positioned at central local side, and ONU/ONT is positioned at user side (its difference is located immediately at user side for ONT, and also has other network such as Ethernet between ONU and user).The ODN that is made up of optical fiber and passive optical splitters or connector between them, wherein OLT is a down direction to the direction of ONU/ONT, otherwise is up direction.With reference to shown in Figure 1, the transmission and processing process of downstream data flow and upstream is different in the GPON system, and downlink data is broadcast to each ONU/ONT from OLT, and each ONU/ONT determines by the matching addresses in packet/data cell and the processing related data.Because the sharing characteristic of ODN, the processing of upstream are complicated more,, need to coordinate the transport stream of each ONU/ONT to OLT in order to prevent collision.Upstream data transmits according to the controlling mechanism among the ONU/OLT, adopts time division multiple access protocol, and this agreement is distributed special-purpose transmission time slot to each ONU/ONT, and these time slots are synchronous, and therefore the data flow from different ONT can not produce collision.
The optical transmission module of the Optical Receivers of OLT and ONU/OLT has all adopted the optical module of EPON network in the present embodiment, the time that promptly happens suddenly is greater than 12ns, but burst optical module less than 512ns, when specific implementation, also can choose the optical module of other indexs among the present invention, here repeat no more, be optical module burst time index in existing EPON and the GPON standard as shown in Table 1:
Table one
| The normal optical module | Attainable low-cost burst module | The EPON standard | The GPON standard | |
| Ton/Toff (ns) | ＞1000 | 40～500 | ＜512 | ＜12 |
Be the burst time requirement (being the optical module burst time of described Ethernet passive optical network in the present embodiment) that adapts to optical module, the lead code of the Frame that also described network unit/optical network terminal is encapsulated among the present invention is configured to predetermined length, the assurance data can correctly be received and dispatched in the GPON system, during specific implementation, the present invention is by increasing the length of lead code Preamble, make Preamble length greater than the intrinsic burst of the system time (EPON burst send set up and the shut-in time+EPON happens suddenly time of reception+BCDR recovery time) after, data can correctly be received and dispatched, and guarantee system's operate as normal.
Below with reference to Fig. 2, Fig. 3 and Fig. 4 are elaborated.
With reference to figure 2, this figure is a GPON system data frame structure.
OLT gives ONT/ONU to issuing continuous data flow Downstream, and each ONU receives the data of different time-gap respectively; ONU sends upstream Upstream to OLT, and when sending data, each ONU uses different time segments, upwards sends by time division multiplexing;
T-CONT1, T-CONT2 etc. are the upstream that each ONU/ONT sends to OLT; Data are the data of same ONU/ONT in each T-CONT; ONU/ONT can take a plurality of T-CONT packets; Keep certain interval between each T-CONT;
US BWMap field comprises the time slot fragment starting and ending position of each T-CONT of upstream in upstream in the downstream data flow.
With reference to figure 3, this figure is a GPON system uplink T-CONT internal data frame structure.
Comprise a plurality of fields in the upstream T-CONT frame, as: physical layer overhead field PLOu, physical layer operations management and upstream data flow management PLOAMu, ascending power rank sequence (PLSu), upstream data dynamic bandwidth report DBRu, digital payload field Payload;
Wherein also specifically comprise among the PLOu: the bit of lead code Preamble, delimiter Delimter, uplink frame interleaves verification BIP, ONU identification field ONU-ID, indication territory Ind;
With reference to figure 4, by the analysis of ONU/ONT upstream data process of transmitting as can be known, the function that will have multiple factor affecting data to send, receive.
At first, the light burst sends influence: shown in Fig. 4 a, when the burst of ONU/ONT optical module sends data, owing to need certain work settling time, the previous section data that send data can not obtain correct data.After sending, obtain the light data output of Fig. 4 c as the data of Fig. 4 b; Data in the AB of Fig. 4 c section will be non-correct data.Different optical module AB scopes are with difference.
Secondly, light-receiving influence: when the burst of OLT optical module received data, transmission signal magnitude and the asynchronism(-nization) of each ONU/ONT needed light-receiving to respond the correct high-low level of output fast.Because the restriction of the dynamic response time of optical module and circuit, some data of front that input receives can not correctly receive.Shown in Fig. 4 d among Fig. 4 and Fig. 4 e, the AC segment signal of the up transmission of ONU/ONT all can not correctly receive.The AC scope was with difference when different optical modules received.
Like this, if the valid data of losing are lower than the data length of the Preamble of lead code, system can also correctly receive; For existing GPON system since the limited time of the AC section that requires (＜90bit, 1.25Gb/s), so system need use expensive high performance ONU optical transmission module and OLT Optical Receivers.
And the optical module of use EPON network in the present embodiment, when the ONU/OLT encapsulation of data, lead code is configured to predetermined length, the length that makes lead code Preamble in the upstream data frame structure is to long enough, happen suddenly the time with the optical module that adapts to described Ethernet passive optical network, thereby the data behind the lead code Preamble can both correctly be received.During specific implementation, those skilled in the art adopt as can be known but are not limited to the length that following manner changes lead code Preamble:
1) the optical network line terminal is a predetermined length by the lead code Preamble that its control and management passage OMCI to network unit/optical network terminal is provided with the uplink frame data of network unit/optical network terminal; Or
2) network unit/optical network terminal fixed configurations lead code Preamble is predetermined long length; Or
3) the optical network line terminal is a predetermined length by the lead code that service channel is provided with the uplink frame data of network unit/optical network terminal;
In addition, but also support software configuring preamble sign indicating number Preamble length of system among the present invention.
The above only is a preferred implementation of the present invention, does not constitute the qualification to protection range of the present invention.Any any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (6)
1. kilomega passive optical network system, include the optical network line terminal, and a plurality of optical network units or Optical Network Terminal, it is characterized in that, Optical Receivers in the described optical network line terminal, and the optical transmission module in optical network unit or the Optical Network Terminal adopts the optical module of burst time less than 512ns; And
The lead code of the Frame of described optical network unit or Optical Network Terminal encapsulation is configured to predetermined length, to adapt to the described optical module burst time.
2. kilomega passive optical network system according to claim 1 is characterized in that, described optical module is the optical module of Ethernet passive optical network EPON.
3. kilomega passive optical network system according to claim 1 and 2 is characterized in that, the lead code that disposes optical network unit or Optical Network Terminal by following manner is a predetermined length:
The optical network line terminal is a predetermined length by the lead code that its control and management passage OMCI to optical network unit or Optical Network Terminal is provided with the uplink frame data of optical network unit or Optical Network Terminal; Or
Optical network unit or Optical Network Terminal fixed configurations lead code are predetermined length; Or
The optical network line terminal is a predetermined length by the lead code that service channel is provided with the uplink frame data of optical network unit or Optical Network Terminal; Or
Optical line terminal, optical network unit or Optical Network Terminal are predetermined length by the software arrangements lead code.
4. the unglazed source network of gigabit according to claim 1 and 2 system is characterized in that, optical line terminal sends data with broadcast mode to optical network unit or Optical Network Terminal.
5. the unglazed source network of gigabit according to claim 4 system is characterized in that, the data that described optical network unit or Optical Network Terminal are definite by matching addresses and processing receives.
6. the unglazed source network of gigabit according to claim 1 and 2 system is characterized in that, described optical network unit or Optical Network Terminal adopt time division multiple access protocol to transmit data to described optical line terminal.
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| CN100384123C true CN100384123C (en) | 2008-04-23 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009152668A1 (en) | 2008-06-19 | 2009-12-23 | 华为技术有限公司 | Method and apparatus for providing uplink burst data in passive optical network |
| WO2009152758A1 (en) * | 2008-06-19 | 2009-12-23 | 华为技术有限公司 | Method and equipment for transmitting the uplink burst data in the passive optical network system |
| CN101860772B (en) * | 2009-04-10 | 2013-06-05 | 华为技术有限公司 | Method and device for crossing time slot |
| CN103051441B (en) * | 2013-01-23 | 2015-03-18 | 和记奥普泰通信技术有限公司 | FPGA (field programmable gata array)-based clock data recovery processing method |
| CN104185094A (en) * | 2013-05-24 | 2014-12-03 | 华为技术有限公司 | Method of transmitting data, device and system |
| CN105578314A (en) * | 2014-10-22 | 2016-05-11 | 中兴通讯股份有限公司 | Lead code setting method and device |
| JP6467053B2 (en) * | 2015-07-17 | 2019-02-06 | 日本電信電話株式会社 | Station side apparatus and optical transmission system in optical transmission system |
| CN105611434B (en) * | 2015-10-27 | 2020-01-07 | 上海斐讯数据通信技术有限公司 | Optical network operation method and system |
| CN106878834B (en) * | 2015-12-10 | 2020-07-31 | 深圳市中兴微电子技术有限公司 | Passive optical network compatible device and implementation method thereof and optical line terminal |
| CN105933802B (en) * | 2016-06-30 | 2019-06-04 | 瑞斯康达科技发展股份有限公司 | A kind of the passive optical network communication means and system of ONU mixed insertion |
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