CN1767692B - Ethernet passive optical network multi service bandwidth distributing system - Google Patents
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Abstract
This invention relates to a multi-service bandwidth distribution system for the Ethernet passive optical network including an optical line terminal device (OLT) and several optical network units (ONU), in which, the OLT is connected with the OUN separately by an optical distribution network and a passive optical divider and has a bandwidth distribution and authorization device connected with the up link and the down link interfaces of the OLT and service node interfaces, the ONU has an executing device for dynamic bandwidth requiring and authorization connected with the up link and down link interfaces of the ONU and user network interfaces, which realizes the high speed dynamic bandwidth distribution function.
Description
Technical field
The present invention relates to fiber optic communication field, particularly Ethernet passive optical network (EPON) field specifically is meant a kind of Ethernet passive optical network multi service bandwidth distributing system.
Background technology
Current network progressively tends to merge, and can support multiple business in consolidated network, comprises Ethernet service, speech business etc.At present, still there are problems such as speech quality can't guarantee in VoIP, it still is user's first-selection that black phone inserts.Ethernet passive optical network (EPON:Ethernet Passive Optical Network) system not only will support the Ethernet service demand as a kind of novel FTTH solution, and necessity of supporting TDM business such as traditional voice service is arranged fully.
But, present 802.3ah standard and agreement be not with DBA (Dynamic Bandwidth Allocation, Dynamic Bandwidth Allocation) as the essential function of EPON product, do not provide concrete, the unified implementation method of DBA yet, in fact this has also exceeded the scope of agreement.But in the face of growing business and the bandwidth demand of user, as the solution of last mile, the EPON product must be able to provide enough bandwidth and efficient, and supports multiple business type, the user's that adequately protects investment and income.But do not realize at present the product that improves of this function in the prior art, so just to network the support of multiple business type is brought certain difficulty, the while also is difficult to guarantee higher network service quality.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide that a kind of network service performance is higher, the Dynamic Bandwidth Allocation effect is better, speed is supported TDM business and Ethernet service, network service quality is reliable and stable, system compatibility good, cost is lower, scope of application Ethernet passive optical network multi service bandwidth distributing system comparatively widely comparatively fast, comprehensively.
In order to realize above-mentioned purpose, Ethernet passive optical network multi service bandwidth distributing system of the present invention is as follows:
This Ethernet passive optical network multi service bandwidth distributing system, comprise optical line terminal equipment OLT and several device of optical network unit ONU, its main feature is, the uplink interface of described optical line terminal equipment OLT is connected with downlink interface with the uplink interface of described each device of optical network unit ONU respectively with passive optical splitters by optical distributed network with downlink interface, have allocated bandwidth and bandwidth authorizing dispensing device and SNI among the described optical line terminal equipment OLT, and this allocated bandwidth all is connected with downlink interface with the uplink interface of described optical line terminal equipment OLT with the bandwidth authorizing dispensing device, have dynamic bandwidth request and bandwidth authorizing final controlling element and User Network Interface among the described device of optical network unit ONU, and this dynamic bandwidth request all is connected with downlink interface with the uplink interface of described device of optical network unit ONU with the bandwidth authorizing final controlling element, described optical line terminal equipment OLT gives described each device of optical network unit ONU unified calculation and distributes bandwidth authorizing according to bandwidth allocation cycle, if certain device of optical network unit ONU up link is opened the TDM business, then described optical line terminal equipment OLT distributes the upstream bandwidth mandate in the cycle this device of optical network unit ONU at each up TDM.
The integral multiple that the up TDM cycle of this Ethernet passive optical network multi service bandwidth distributing system is 125us.
The uplink interface of the optical line terminal equipment OLT of this Ethernet passive optical network multi service bandwidth distributing system is an Ethernet passive optical network light path upstream side interface, and its downlink interface is an Ethernet passive optical network light path downlink side interface.
The uplink interface of the device of optical network unit ONU of this Ethernet passive optical network multi service bandwidth distributing system is an Ethernet passive optical network light path upstream side interface, and its downlink interface is an Ethernet passive optical network light path downlink side interface.
The optical line terminal equipment OLT of this Ethernet passive optical network multi service bandwidth distributing system distributes to the bandwidth authorizing of device of optical network unit ONU, is divided into following three part bandwidth:
(1) Multi-point Control Protocol MPCP bandwidth is used to support the function and the operation of Ethernet passive optical network Multi-point Control Protocol, comprises finding and registration, and the up dynamic bandwidth request report frame of ONU;
(2) Ethernet bandwidth is used to Ethernet data or the ethernet frame of supporting that device of optical network unit ONU is up, comprises Ethernet data message and Ethernet control message, operation management maintain OAM frame;
(3) TDM bandwidth is used to support the tdm data that device of optical network unit ONU is up or the cyclical transmission of TDM frame, guarantee each up TDM in the cycle device of optical network unit ONU all obtain the corresponding bandwidth mandate.
The allocated bandwidth of this Ethernet passive optical network multi service bandwidth distributing system and bandwidth authorizing dispensing device comprise that the dynamic bandwidth solicited message receives and resolution unit, statistics and pretreatment unit, static state and Dynamic Bandwidth Allocation unit, bandwidth authorizing computing unit and bandwidth authorizing arrangement and Dispatching Unit, the signal of the uplink interface of described optical line terminal equipment OLT receives and resolution unit by described dynamic bandwidth solicited message successively, statistics and pretreatment unit, static state and Dynamic Bandwidth Allocation unit, the bandwidth authorizing computing unit, bandwidth authorizing is arranged and Dispatching Unit, is sent to the downlink interface of optical line terminal equipment OLT.
The allocated bandwidth of this Ethernet passive optical network multi service bandwidth distributing system and bandwidth authorizing dispensing device also comprise a bandwidth and parameter configuration unit, this bandwidth and parameter configuration unit are connected with Dynamic Bandwidth Allocation unit, bandwidth authorizing computing unit with static respectively, and optical line terminal equipment OLT management is connected with described bandwidth and parameter configuration unit with monitoring module.
The dynamic bandwidth request of this Ethernet passive optical network multi service bandwidth distributing system and bandwidth authorizing final controlling element comprise that bandwidth authorizing receives and performance element, the laser control unit, sampling of uplink service speed and statistic unit, Dynamic Bandwidth Allocation solicited message computing unit, the MPCPReport frame produces and transmitting element, the signal of the downlink interface of described device of optical network unit ONU receives with performance element by described bandwidth authorizing and is sent to described laser control unit, the upward signal of described User Network Interface is by sampling of uplink service speed and statistic unit, Dynamic Bandwidth Allocation solicited message computing unit, MPCP Report frame produces and transmitting element, is sent to the uplink interface of device of optical network unit ONU.
The dynamic bandwidth request of this Ethernet passive optical network multi service bandwidth distributing system and bandwidth authorizing final controlling element also comprise a bandwidth and parameter configuration unit, this bandwidth and parameter configuration unit are connected with statistic unit, Dynamic Bandwidth Allocation solicited message computing unit with the sampling of uplink service speed respectively, and device of optical network unit ONU management is connected with described bandwidth and parameter configuration unit with monitoring module.
Adopted the Ethernet passive optical network multi service bandwidth distributing system of this invention, because each main functional modules in this system all adopts hardware circuit to realize, have allocated bandwidth and bandwidth authorizing dispensing device among the optical line terminal equipment OLT wherein, have dynamic bandwidth request and bandwidth authorizing final controlling element among the device of optical network unit ONU, by the coordinated work between the above-mentioned hardware circuit, thereby realized high-speed Dynamic Bandwidth Allocation function, and make that whole network service performance is higher, the Dynamic Bandwidth Allocation effect is better, and speed is very fast; Moreover, adopt said system, can support the TDM business comprehensively,, comprise POTS, E1, T1 etc., support Ethernet service preferably simultaneously,, comprise VoIP, IPTV, video request program etc. as Ethernet Service as TDM Service; And network service quality is reliable and stable, and system compatibility is good, and cost is lower, and the scope of application is comparatively extensive, and the development of Networks of Fiber Communications and broadband connections technology is laid a good foundation.
Description of drawings
Fig. 1 is the schematic diagram based on the allocated bandwidth mechanism of multi-service support.
Fig. 2 is the allomeric function module diagram of Ethernet passive optical network multi service bandwidth distributing system of the present invention.
Fig. 3 is the high-level schematic functional block diagram of the optical line terminal equipment OLT of Ethernet passive optical network multi service bandwidth distributing system of the present invention.
Fig. 4 is the high-level schematic functional block diagram of the device of optical network unit ONU of Ethernet passive optical network multi service bandwidth distributing system of the present invention.
Fig. 5 is for adopting the data downstream course of work schematic diagram of Ethernet passive optical network multi service bandwidth distributing system of the present invention.
Fig. 6 is for adopting the data uplink course of work schematic diagram of Ethernet passive optical network multi service bandwidth distributing system of the present invention.
Embodiment
In order more to be expressly understood technology contents of the present invention, at first introduce some technical terms, as shown in the table:
| PON | Passive Optical Network | EPON |
| APON | ATM Passive Optical Network | ATM Passive Optical Network |
| BPON | Broadband Passive Optical Network | Broadband passive optical network |
| EPON | Ethernet Passive Optical Network | Ethernet passive optical network |
| GPON | Gigabit Passive Optical Network | Gigabit passive optical network |
| FTTH | Fiber To The Home | Fiber to the home |
| FTTB | FTTB Fiber To The Building | Fiber-To-The-Building |
| MPCP | Multi-Point Control Protocol | Multi-point Control Protocol |
| OLT | Optical Line Terminal | Optical line terminal |
| ONU | Optical Network Units | Optical network unit |
| POS | Passive Optical Splitter | Passive optical splitters |
| ODN | Optical Distribution Network | Optical distributed network |
| BW | Bandwidth | Bandwidth |
| BA | Bandwidth Allocation | Allocated bandwidth |
[0022]
| SBA | Sratic Bandwidth Allocation | Static bandwidth allocation |
| DBA | Dynamic Bandwidth Allocation | Dynamic Bandwidth Allocation |
| MAC | Media Access Control | The medium access control |
| SNI | Service Node Interface | SNI |
| UNI | User Network Interface | User Network Interface |
| OAM | Operations Administration Maintenance | Operation management maintain |
| Ethernet | Ethernet | |
| Service | Professional | |
| Frame | Frame, or message, this paper are not done differentiation | |
| MPCP Frame | The Multi-point Control Protocol frame | |
| Ethernet Service、Ethernet Frame、Ethernet Data Frame | Ethernet service, ethernet frame, Ethernet data implication duplicate, and this paper does not do differentiation | |
| Transmission Window | Transmission window, or send window, this paper are not done differentiation | |
| Grant | Bandwidth authorizing, or bandwidth permission, this paper does not do differentiation | |
| Request | Request (the dynamic bandwidth solicited message of ONU just) | |
| Report | Report (just ONU dynamic bandwidth solicited message reports) |
In existing telematic services, the difference of Ethernet service and TDM business, the difference of data service in other words and speech business, be very significantly.The former has sudden, need to guarantee the correctness of transmission, but insensitive to time delay, shake, and the latter has periodically, continuity, requires very high to time delay, shake.So support at the same time in the EPON system of Ethernet service and TDM business, Dynamic Bandwidth Allocation must be treated with a certain discrimination two kinds of business, with difference and the characteristics of taking into account both.
Provide TDM business in the EPON system, the tdm data of optical line terminal OLT and optical network unit ONU must periodically be packed and be sent, transmits, receives, resolves.The EPON up link is because be the time division multiplexing transmission means, ONU is that burst sends (Burst Transmit), OLT is that burst receives (Burst Receive), so its allocated bandwidth and professional transmission are more complicated than down link, because the upstream bandwidth mandate of ONU (bandwidth permission in other words, the time window of ONU uplink data sending just) is the OLT unified distribution and arranges, if the up TDM business of opening of certain ONU, then OLT must distribute bandwidth authorizing will in the cycle this ONU at each up TDM, even otherwise ONU periodically has been packaged into up tdm data TDM frame (TDM Frame), also can can't timed sending give OLT, and then cause the professional appearance of TDM to be interrupted because of not free window, error code, various mistakes such as sliding frame.
This TDM cycle (is used Δ T
TDMExpression) directly has influence on TDM frame length (Frame length), the professional time-delay of TDM (Delay), tdm data efficiency of transmission and tdm data buffer memory capacity, Δ T simultaneously
TDMIt also is the cycle of whole EPON system uplink bandwidth calculation and distribution, so Δ T
TDMSelection and value must take all factors into consideration TDM business and Ethernet service, according to practical business demand and performance index, between efficient, time-delay, performance, trade off.Consider 1 frame=125us (time interval of 8KHz speech sample, quantification just) of 2M E1, so Δ T
TDMPreferably equal the integral multiple of this time:
Δ T
TDM=N
TDM* 125us (N
TDMBe positive integer)
In system of the present invention, get N usually
TDM=4, just:
ΔT
TDM＝4×125us＝500us
But this does not show Δ T
TDMThis value can only be arranged, and also is fully feasible such as following several values, the just compromise emphasis difference of considering:
Δ T
TDM=2 * 125us=250us (gets N
TDM=2)
Δ T
TDM=3 * 125us=375us (gets N
TDM=3)
Δ T
TDM=6 * 125us=750us (gets N
TDM=6)
Δ T
TDM=8 * 125us=1ms (gets N
TDM=8)
In real work, formation and distribution mechanism for the ONU upstream bandwidth, OLT calculates to ONU and when distributing uplink bandwidth, must take into account TDM business and Ethernet service simultaneously, the former requires accurate timing, periodically sends, but frame length is relatively short, excursion is little, and the latter is insensitive to time-delay, shake, not periodically requirement, but frame length is relatively long, excursion is big, so the business dissimilar to ONU, OLT must treat with a certain discrimination, in other words, final, the actual bandwidth that obtains of ONU should be made of several parts shown in the following table:
| Bandwidth constitutes | Type of service | Function |
| MPCP bandwidth (MPCP Bandwidth) | The MPCP frame | Support the function and the operation of EPON MPCP agreement, comprise and finding and registration (Discovery and Registered), and the up dynamic bandwidth request report frame (MPCP Report frame just) of ONU |
| Ethernet bandwidth (Etllemet Bandwidth) | Ethernet service | Support Ethernet data (or ethernet frame), comprise Ethernet data message and Ethernet control message (protocol massages just), OAM frame etc. |
| TDM bandwidth (TDM Bandwidth) | The TDM business | Support the cyclical transmission of tdm data (or TDM frame), guarantee each up TDM in the cycle ONU all can obtain corresponding bandwidth mandate (send window just) |
See also shown in Figure 1, for the allocated bandwidth mechanism of supporting based on multi-service, wherein overhead bandwidth mandate (OverheadGrant) is the overhead time of the optical device of OLT and ONU under the up link time division multiplexing mode, because ONU carries out bandwidth authorizing at every turn, open the send window transmission that happens suddenly, all to experience and open laser (Laser On), send idle code word (Idle Pattem), send business datum (Service Data), close laser 4 processes such as (Laser Off), wherein having only the 3rd process is effective bandwidth (available bandwidth in other words), other 3 processes all are overhead bandwidth, sending idle code word mainly is that the laser of OLT can be synchronized to fast when burst receives on the light signal of this ONU transmission, and its transmitting time must be not less than the lock in time of OLT laser.Just:
Time+ONU that overhead bandwidth mandate=ONU opens laser close laser time+lock in time of OLT laser;
That is: Overhead Grant=ONU Laser On Time+ONU Laser On Time+OLT Sync Time;
Available bandwidth mandate=bandwidth authorizing total length-overhead bandwidth mandate;
That is: Available Grant=Grant Length-Overhead Grant;
Obviously, the existence of overhead bandwidth mandate (Overhead Grant), influenced the efficient of the professional transmission of EPON system up-link greatly, and Ethernet service all is elongated frame, maximum frame length can reach 1518 bytes (Bytes), with respect to the length of available bandwidth mandate (Available Grant), be unfavorable for the efficient of Ethernet service (ethernet frame in other words) more in the EPON ul transmissions.Therefore adopt high efficiency bandwidth authorizing method to be very important, and also be the effective way of improving network performance.
For concrete technology contents of the present invention, describe in detail especially exemplified by following examples.
See also Fig. 2, Fig. 3 and shown in Figure 4, this Ethernet passive optical network multi service bandwidth distributing system, comprise optical line terminal equipment OLT1 and several device of optical network unit ONU2, wherein, the uplink interface Rx of described optical line terminal equipment OLT1 is connected with downlink interface Rx with the uplink interface Tx of described each device of optical network unit ONU2 respectively with passive optical splitters 4 by optical distributed network 3 with downlink interface Tx, have allocated bandwidth and bandwidth authorizing dispensing device 11 and SNI 12 among the described optical line terminal equipment OLT1, and this allocated bandwidth all is connected with downlink interface Tx with the uplink interface Rx of described optical line terminal equipment OLT1 with bandwidth authorizing dispensing device 11, have dynamic bandwidth request and bandwidth authorizing final controlling element 21 and User Network Interface 22 among the described device of optical network unit ONU2, and this dynamic bandwidth request is connected all with downlink interface Rx with the uplink interface Tx of described device of optical network unit ONU2 with bandwidth authorizing final controlling element 21.
In actual applications, in the above-mentioned multi service bandwidth distributing system, all be to adopt software and hardware system and logical circuit to realize that wherein based on hardware circuit, software is auxilliary.
The supercomputing of main property performance period of hardware circuit, allocated bandwidth and transmitting-receiving/analysis protocol frame (MPCP Frame).
In the present embodiment, the uplink interface Rx of this optical line terminal equipment OLT1 is Ethernet passive optical network light path upstream side interface Rx, and its downlink interface Tx is Ethernet passive optical network light path downlink side interface Tx; The uplink interface Tx of this device of optical network unit ONU2 is Ethernet passive optical network light path upstream side interface Tx, and its downlink interface Rx is Ethernet passive optical network light path downlink side interface Rx.
Simultaneously, in the present embodiment, above-mentioned allocated bandwidth and bandwidth authorizing dispensing device 11 comprise that the dynamic bandwidth solicited message receives and resolution unit 13, statistics and pretreatment unit 14, static state and Dynamic Bandwidth Allocation unit 15, bandwidth authorizing computing unit 16, bandwidth authorizing is arranged and Dispatching Unit 17, the signal of the uplink interface Rx of described optical line terminal equipment OLT1 receives and resolution unit 13 by described dynamic bandwidth solicited message successively, statistics and pretreatment unit 14, static state and Dynamic Bandwidth Allocation unit 15, bandwidth authorizing computing unit 16, bandwidth authorizing is arranged and Dispatching Unit 17, is sent to the downlink interface Tx of optical line terminal equipment OLT1.
Wherein, the dynamic bandwidth solicited message receives with resolution unit 13 and is used for receiving and the parsing bandwidth request information, statistics is used for each ONU bandwidth request information of preliminary treatment with pretreatment unit 14, static and Dynamic Bandwidth Allocation unit 15 is used for finishing static and Dynamic Bandwidth Allocation function, bandwidth authorizing computing unit 16 is used for using the polymerization algorithm to carry out bandwidth authorizing and calculates, and bandwidth authorizing arrangement and Dispatching Unit 17 are used for carrying out bandwidth authorizing arrangement and distribution.
In actual applications, these hardware circuits on the described optical line terminal equipment OLT1 are finished following function:
(1) inquiry, resolves MPCP Report Message (MPCP Report Frame just), obtain the dynamic bandwidth solicited message (ONU ' s DBA Request) of each ONU;
(2) bandwidth of the various types of traffic of each ONU of calculating in each bandwidth allocation cycle;
(3) calculate, distribute bandwidth authorizing (Grant) and be distributed to each ONU by MPCP frame (MPCP Gate Frame).
Moreover, above-mentioned allocated bandwidth and bandwidth authorizing dispensing device 11 also comprise a bandwidth and parameter configuration unit 18, this bandwidth and parameter configuration unit 18 are connected with Dynamic Bandwidth Allocation unit 15, bandwidth authorizing computing unit 16 with static respectively, and an optical line terminal equipment OLT management is connected with described bandwidth and parameter configuration unit 18 with monitoring module 19.
In the middle of practical application, described this class management and monitoring module are mainly used in realizes equipment control, man-machine interface, static bandwidth configuration, algorithm parameter configuration, statistical counting, performance monitoring etc.
Above-mentioned optical line terminal equipment OLT management and monitoring module 19 are finished following function:
(1) disposes the TDM service bandwidth of each ONU;
(2) dispose the Ethernet service static bandwidth of each ONU;
(3) dispose the parameter (such as high low threshold etc.) of the Ethernet service dynamic bandwidth of each ONU;
(4) dispose the parameter (such as weight, top limit, high low threshold etc.) of the Ethernet service dynamic bandwidth of each ONU;
(5) parameter of configuration ONU Report Message (such as polling cycle etc.).
Corresponding, in the present embodiment, dynamic bandwidth request and bandwidth authorizing final controlling element 21 above-mentioned in this Ethernet passive optical network multi service bandwidth distributing system comprise that bandwidth authorizing receives and performance element 23, laser control unit 24, sampling of uplink service speed and statistic unit 25, Dynamic Bandwidth Allocation solicited message computing unit 26, MPCP Report frame produces and transmitting element 27, the signal of the downlink interface Rx of described device of optical network unit ONU 2 receives with performance element 23 by described bandwidth authorizing and is sent to described laser control unit 24, the upward signal of described User Network Interface 22 is by sampling of uplink service speed and statistic unit 25, Dynamic Bandwidth Allocation solicited message computing unit 26, MPCP Report frame produces and transmitting element 27, is sent to the uplink interface Tx of device of optical network unit ONU 2.
Wherein, bandwidth authorizing receives with performance element 23 and is used for receiving and the execution bandwidth authorizing, laser control unit 24 is used for carrying out the controlled function of ONU laser 210, the sampling of uplink service speed is used for carrying out sampling of uplink service speed and statistics with statistic unit 25, Dynamic Bandwidth Allocation solicited message computing unit 26 is used for finishing the bandwidth request information computing function, and the MPCPReport frame produces with transmitting element 27 and is used for carrying out the generation and the transmission of MPCP Report frame.
In the middle of practical application, these hardware circuits on the described device of optical network unit ONU2 are finished following function:
(1) receives, resolves MPCP bandwidth authorizing frame (MPCP Gate Frame), obtain the bandwidth authorizing of up link;
(2) carry out bandwidth authorizing, uplink service is sent to OLT by send window;
(3) periodically produce MPCP Report Message (MPCP Report Frame just);
(4) bandwidth rates of up Ethernet service and the length of metadata cache (priority query) are sampled, added up and calculate.
Moreover, above-mentioned dynamic bandwidth request and bandwidth authorizing final controlling element 21 also comprise a bandwidth and parameter configuration unit 28, sampling is connected with statistic unit 25, Dynamic Bandwidth Allocation solicited message computing unit 26 with uplink service speed respectively for this bandwidth and parameter configuration unit 28, and a device of optical network unit ONU management is connected with described bandwidth and parameter configuration unit 28 with monitoring module 29.
Above-mentioned device of optical network unit ONU management and monitoring module 29 are finished following function:
(1) parameter of configuration ONU Report message (such as report cycle etc.);
(2) parameter (such as sample frequency, computing cycle, design factor etc.) of configuration dynamic bandwidth request algorithm.
System of the present invention has utilized above-mentioned this multi-service allocated bandwidth mechanism just, realize the TDM allocated bandwidth, comprehensively support the TDM business in, on the basis of complete compatible 802.3ah standard ethernet business, and then realized high-performance DBA function.
See also Fig. 5 and shown in Figure 6 again, after having adopted above-mentioned technical scheme, allocated bandwidth mechanism for this innovation of Ethernet passive optical network EPON system, it can complete compatible 802.3ah standard, comprehensive support to the TDM business can be provided again, when guaranteeing the TDM service feature, do not lose the efficient of Ethernet service transmission again and to the compatibility of EPON standard, implementation is based on hardware logic, software is auxilliary, the supercomputing of hardware logic property performance period, allocated bandwidth and transmitting-receiving/analysis protocol frame (MPCP Frame), software is realized equipment control, man-machine interface, the static bandwidth configuration, the algorithm parameter configuration, statistical counting, performance monitoring etc.
Wherein, the key factor of core is the selection for bandwidth allocation cycle, problem hereto, here mainly be according to the requirement of TDM performance of services, next is the efficiency of transmission of Ethernet service, buffer memory capacity, time-delay characteristics etc., follow-up Dynamic Bandwidth Allocation operation and the operation of Ethernet service bandwidth authorizing, all be on this basis to allocated bandwidth, the concrete execution and the optimization of bandwidth authorizing (bandwidth permission just), just because of a such basis has been arranged, TDM business and the performance of being supported at present can be realized and have to EPON equipment and product.
Simultaneously, starting point of the present invention is to realize to TDM the professional and high-performance of Ethernet service, high efficiency support in the EPON system simultaneously, especially for the performance optimization of Ethernet service, has played extraordinary effect.
Adopted above-mentioned Ethernet passive optical network multi service bandwidth distributing system, because each main functional modules in this system all adopts hardware circuit to realize, have allocated bandwidth and bandwidth authorizing dispensing device 11 among the optical line terminal equipment OLT1 wherein, have dynamic bandwidth request and bandwidth authorizing final controlling element 21 among the device of optical network unit ONU2, by the coordinated work between the above-mentioned hardware circuit, thereby realized high-speed Dynamic Bandwidth Allocation function, and make that whole network service performance is higher, the Dynamic Bandwidth Allocation effect is better, and speed is very fast; Moreover, adopt said system, can support the TDM business comprehensively,, comprise POTS, E1, T1 etc., support Ethernet service preferably simultaneously,, comprise VoIP, IPTV, video request program etc. as Ethernet Service as TDM Service; And network service quality is reliable and stable, and system compatibility is good, and cost is lower, and the scope of application is comparatively extensive, and the development of Networks of Fiber Communications and broadband connections technology is laid a good foundation.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (9)
1. Ethernet passive optical network multi service bandwidth distributing system, comprise optical line terminal equipment OLT and several device of optical network unit ONU, it is characterized in that, the uplink interface of described optical line terminal equipment OLT is connected with downlink interface with the uplink interface of described each device of optical network unit ONU respectively with passive optical splitters by optical distributed network with downlink interface, have allocated bandwidth and bandwidth authorizing dispensing device and SNI among the described optical line terminal equipment OLT, and this allocated bandwidth all is connected with downlink interface with the uplink interface of described optical line terminal equipment OLT with the bandwidth authorizing dispensing device, have dynamic bandwidth request and bandwidth authorizing final controlling element and User Network Interface among the described device of optical network unit ONU, and this dynamic bandwidth request all is connected with downlink interface with the uplink interface of described device of optical network unit ONU with the bandwidth authorizing final controlling element, described optical line terminal equipment OLT gives described each device of optical network unit ONU unified calculation and distributes bandwidth authorizing according to bandwidth allocation cycle, if certain device of optical network unit ONU up link is opened the TDM business, then described optical line terminal equipment OLT distributes the upstream bandwidth mandate in the cycle this device of optical network unit ONU at each up TDM.
2. Ethernet passive optical network multi service bandwidth distributing system according to claim 1 is characterized in that, the integral multiple that the described up TDM cycle is 125us.
3. Ethernet passive optical network multi service bandwidth distributing system according to claim 1, it is characterized in that, the uplink interface of described optical line terminal equipment OLT is an Ethernet passive optical network light path upstream side interface, and its downlink interface is an Ethernet passive optical network light path downlink side interface.
4. Ethernet passive optical network multi service bandwidth distributing system according to claim 1, it is characterized in that, the uplink interface of described device of optical network unit ONU is an Ethernet passive optical network light path upstream side interface, and its downlink interface is an Ethernet passive optical network light path downlink side interface.
5. Ethernet passive optical network multi service bandwidth distributing system according to claim 1 is characterized in that described optical line terminal equipment OLT distributes to the bandwidth authorizing of device of optical network unit ONU, is divided into following three part bandwidth:
(1) Multi-point Control Protocol MPCP bandwidth is used to support the function and the operation of Ethernet passive optical network Multi-point Control Protocol, comprises finding and registration, and the up dynamic bandwidth request report frame of ONU;
(2) Ethernet bandwidth is used to Ethernet data or the ethernet frame of supporting that device of optical network unit ONU is up, comprises Ethernet data message and Ethernet control message, operation management maintain OAM frame;
(3) TDM bandwidth is used to support the tdm data that device of optical network unit ONU is up or the cyclical transmission of TDM frame, guarantee each up TDM in the cycle device of optical network unit ONU all obtain the corresponding bandwidth mandate.
6. according to each described Ethernet passive optical network multi service bandwidth distributing system in the claim 1 to 5, it is characterized in that, described allocated bandwidth and bandwidth authorizing dispensing device comprise that the dynamic bandwidth solicited message receives and resolution unit, statistics and pretreatment unit, static state and Dynamic Bandwidth Allocation unit, bandwidth authorizing computing unit and bandwidth authorizing arrangement and Dispatching Unit, the signal of the uplink interface of described optical line terminal equipment OLT receives and resolution unit by described dynamic bandwidth solicited message successively, statistics and pretreatment unit, static state and Dynamic Bandwidth Allocation unit, the bandwidth authorizing computing unit, bandwidth authorizing is arranged and Dispatching Unit, is sent to the downlink interface of optical line terminal equipment OLT.
7. Ethernet passive optical network multi service bandwidth distributing system according to claim 6, it is characterized in that, described allocated bandwidth and bandwidth authorizing dispensing device also comprise a bandwidth and parameter configuration unit, this bandwidth and parameter configuration unit are connected with Dynamic Bandwidth Allocation unit, bandwidth authorizing computing unit with static respectively, and optical line terminal equipment OLT management is connected with described bandwidth and parameter configuration unit with monitoring module.
8. according to each described Ethernet passive optical network multi service bandwidth distributing system in the claim 1 to 5, it is characterized in that, described dynamic bandwidth request and bandwidth authorizing final controlling element comprise that bandwidth authorizing receives and performance element, the laser control unit, sampling of uplink service speed and statistic unit, Dynamic Bandwidth Allocation solicited message computing unit, MPCP Report frame produces and transmitting element, the signal of the downlink interface of described device of optical network unit ONU receives with performance element by described bandwidth authorizing and is sent to described laser control unit, the upward signal of described User Network Interface is by sampling of uplink service speed and statistic unit, Dynamic Bandwidth Allocation solicited message computing unit, MPCP Report frame produces and transmitting element, is sent to the uplink interface of device of optical network unit ONU.
9. Ethernet passive optical network multi service bandwidth distributing system according to claim 8, it is characterized in that, described dynamic bandwidth request and bandwidth authorizing final controlling element also comprise a bandwidth and parameter configuration unit, this bandwidth and parameter configuration unit are connected with statistic unit, Dynamic Bandwidth Allocation solicited message computing unit with the sampling of uplink service speed respectively, and device of optical network unit ONU management is connected with described bandwidth and parameter configuration unit with monitoring module.
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