CN100355248C - Multiple business realizing method based on ethernet passive optical network - Google Patents
Multiple business realizing method based on ethernet passive optical network Download PDFInfo
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- CN100355248C CN100355248C CNB031512569A CN03151256A CN100355248C CN 100355248 C CN100355248 C CN 100355248C CN B031512569 A CNB031512569 A CN B031512569A CN 03151256 A CN03151256 A CN 03151256A CN 100355248 C CN100355248 C CN 100355248C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/34—Signalling channels for network management communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0064—Arbitration, scheduling or medium access control aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0084—Quality of service aspects
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Abstract
The present invention provides a multiple business realizing method based on an Ethernet passive optical network (EPON). Ethernet data frames and the bandwidth allocation request frames and the bandwidth allocation authorization frames of and OAM (operation, administration and maintenance) are marked for business types/priorities (PID) so that the present invention further provides a dynamic bandwidth allocation method for the EPON and a processing method for transmitting and receiving multiple business data. The present invention is compatible with the existing Ethernet standard frame format and multiple businesses are directly encapsulated and transmitted in a media access control (MAC) layer, and therefore, the present invention improves the transmission efficiency of the network and simultaneously provides possibilities for different business types to realize differentiated services on the EPON.
Description
(1) technical field
The present invention relates to EPON (PON) system, relate in particular to a kind of multi-service implementation method that is used for Ethernet passive optical network (EPON).
(2) background technology
Ethernet is with low cost with it, the characteristic of technology maturation and high bandwidth has obtained the large-scale application of metropolitan area network and wide area network, permeates to Access Network gradually.And EPON is becoming the main solution that Ethernet inserts section, Fig. 1 is a typical EPON broadband access network, it is made up of local side optical line terminal (OLT) 10 and user side optical network unit (ONU) 12i (i=a, b, c), each ONU shares transmission medium by passive light beam splitter 11, it is the network of typical point-to-multipoint, wherein downlink data passes through broadcast mode, uply transmit by the Time Division Multiplexing mode, OLT unifies scheduling, allocated bandwidth to each ONU.When ONU12i receives data flow, only extract and issue the packet of oneself, will issue the data packet discarding of other ONU.For example, 12a has received packet 1,2,3 in Fig. 1, but only packet 1 is sent to terminal use 13a; Upstream adopts time-division multiplex technology, and each ONU distributes a transmission time slot.These time slots are synchronous, therefore when packet is coupled in the optical fiber, can not produce interference between the packet of different ONU.For example, 12a is at the 2nd, 5 slot transmission packet 1, and 12b does not have occupied slot transmission packet 2 at the 3rd, and the rest may be inferred.
EPON makes service supplier can adopt a very cheap platform that multiple value-added service is provided, but Ethernet is not provided at the carrying of other traditional businesses, as TDM speech business and other real time business, therefore, how to realize on the EPON network that the multi-service access becomes more and more important.
At present, 802.3 EFM (the 1st mile Ethernet) working group just is being devoted to the standardization of EPON system stipulations drafts, and according to its present progress, its draft does not provide the multi-service scheme that how to realize.
Although industry has proposed how to provide multiple services scheme more than the IP layer, as based on ITU-T (International Telecommunications Union) H.323 standard " based on the multimedia communications system of packet " (Packet-Based Multi-MediaCommunications System) adopt IP packet voice-bearer, graphic service (Voice over IP, Video overIP), this scheme is directly used among the EPON, too complicated, poor efficiency.It need increase by 20 byte IP expenses and 20 byte TCP expenses, and Xiang Guan type of service/priority message must provide by the 3rd layer (network layer) simultaneously.The influence that the while second layer (data link layer) can not provide priority delay sensitive, high-priority service can be subjected to the standard ethernet control frame is as time-out/back pressure frame.
In 2002 8/9 month " optical-fiber network magazine " last the 280th to 298 page of disclosed " supporting the Ethernet passive optical network of Differentiated Services " (Supporting differentiated classes of service in Ethernet passiveoptical networks) literary composition, author Glen Kramer and Biswanath mukherjee have proposed a kind ofly to provide the indication of type of service, priority by the VLAN mark, carry out the multi-service transmission.But this scheme needs the necessary supported vlans of network, and professional simultaneously carrying is still by 3 layer protocols.
On Ethernet, provide multi-service to transmit based on the second layer and just causing the industry attention, ZhuoLian Semiconductor company (ZarlinkSemiconductor) provides the possibility of a kind of Ethernet and TDM speech business, but, this scheme does not provide relevant type of service/service priority sign, does not mention the transmission means of video traffic simultaneously.And the company of another Teknovus by name proposes a kind of product TK3501 that utilizes physical layer bits/words internode difference mode to transmit the TDM speech business, in the physical layer code stream of Ethernet, insert the data of TDM, the physical layer specification of the Ethernet that this scheme changes fully lacks compatibility and extensibility.
(3) summary of the invention
The object of the invention is to provide that a kind of optical line terminal (OLT) and/or multi-service data between a plurality of optical network unit (ONU) that is used for the Ethernet passive optical network system sends, receiving handling method.
The further purpose of the present invention is to provide a kind of optical line terminal (OLT) of Ethernet passive optical network system and distribution method of dynamic bandwidth between a plurality of optical network unit (ONU) of being used for.
The object of the invention be to provide a kind of in the Ethernet passive optical network system OLT and a plurality of ONU between the structure of the ethernet data frame that transmits, to support the transfer of data of different service types/priority.
The further purpose of the present invention is to provide a kind of operation, the management of Ethernet passive optical network, the bandwidth allocation request frame of safeguarding (OAM), allocated bandwidth mandate frame format of being used for, with the relevant OAM(Operation Administration Maintenance) of type of service of supporting different priorities.
According to an aspect of the present invention, provide a kind of multi-service data that is used for Ethernet passive optical network optical line terminal (OLT) and a plurality of optical network unit (ONU) to send processing method, comprise the steps:
A1), the port from different service types receives data;
B1), carry out receiving data according to type of service: fill the professional encapsulation of ethernet data frame, corresponding data buffer zone; Or directly carry out corresponding data buffer zone and fill;
C1), allow instruction according to sending, from corresponding data buffer zone taking-up data;
D1), according to type of service to be sent, be provided with and comprise type of service/priority tag (PID) information, and send this ethernet data frame in interior preamble (PREAMBLE) field.
Above-mentioned data sending processing method step b1) described type of service is if the filling of corresponding data buffer zone is then directly carried out in the traditional ethernet data service.
Above-mentioned data sending processing method step d1) also comprises and ethernet data frame payload section unit (PDU) is carried out the time stab information setting, industry affair clock recovery when described time stab information can be used for.
According to another aspect of the present invention, provide a kind of optical line terminal (OLT) of Ethernet passive optical network system or multi-service data receiving handling method between a plurality of optical network unit (ONU) of being used for, it is characterized in that step:
A2), receive ethernet data frame from the Ethernet passive optical network optical interface;
B2), read and comprise type of service/priority tag (PID) information in interior preamble (PREAMBLE) field;
C2), according to type of service/priority tag (PID) information, judge when type of service is non-traditional Ethernet service, then remove the ethernet data frame encapsulation and be forwarded to the corresponding port and handle.
Above-mentioned method for receiving and processing data step c2) described type of service is if the traditional ethernet data service, then further judge whether it is OAM message, if data forward the OAM Message Processing to and partly handle, otherwise, be forwarded to corresponding ethernet port and handle.
According to another aspect of the present invention, provide a kind of in the Ethernet passive optical network system optical line terminal (OLT) and the distribution method of dynamic bandwidth between a plurality of optical network unit (ONU), comprise the steps:
A3), send ONU report bandwidth permission frame by OLT to ONU, so that authorize ONU to send bandwidth request;
B3), send to OLT at ONU report bandwidth permitted hours by the ONU that accepts report bandwidth permission frame and comprise each grouping information of ONU and type of service/priority tag (PID) solicited message thereof at interior bandwidth allocation request frame;
C3), OLT receives ONU bandwidth allocation request frame, carries out priority scheduling, send to ONU to comprise each grouping information of ONU and type of service/priority tag (PID) assignment information thereof at interior allocated bandwidth mandate frame;
D3), by the ONU that accepts allocated bandwidth mandate frame, according to the allocated bandwidth of authorizing, send data after inserting the stand-by period;
Wherein, described type of service/priority tag PID is positioned at the 5th byte of the preamble PREAMBLE field of ethernet data frame.
The present invention has guaranteed the compatibility with the existing Ethernet standard frame format, can effectively reduce design, the development cost of EPON.Owing to do not relate to the complicated protocol processes more than 3 layers, reduced the time delay of Business Processing.Simultaneously, multi-service is directly carried out encapsulated delivery at media interviews controls (MAC) layer, has improved the efficiency of transmission of network.In the Dynamic Bandwidth Allocation process, introduce type of service/priority tag (PID), provide possibility, realized the multi-service transmission on the EPON for the traffic differentiation service is provided.
(4) description of drawings
Fig. 1 is a kind of typical EPON structure function schematic diagram;
Fig. 2 is IEEE 802.3 frame formats;
Fig. 3 is the schematic diagram of the Ethernet data frame structure of the Internet engineering duty group (IETF) proposal;
Fig. 4 is an Ethernet data frame structure of the present invention;
Fig. 5 is bandwidth allocation request frame structure definition of the present invention;
Fig. 6 is allocated bandwidth mandate frame structure definition of the present invention;
Fig. 7 is a Dynamic Bandwidth Allocation process schematic diagram of the present invention;
Fig. 8 is a data sending processing flow process of the present invention;
Fig. 9 is a Data Receiving handling process of the present invention;
(5) embodiment
Fig. 2 is the schematic diagram of IEEE 802.3 ethernet frame structures.Ethernet frame preamble (PREAMBLE) field 100 comprises by playing lead code (Pre) field 101 that specific bit stream is used for 7 bytes of frame synchronization or physically stable in frame start-up portion front, by playing Start Frame Delimiter (SFD) field 102 of 1 byte that is used for representing the frame start-up portion of specific format bit stream; Destination address (DA) field 110 and the source address (sa) field 120 that have 6 bytes respectively; Length/type (LDF/TYP) field 130 of 2 bytes of expression data (payload section unit) field length; Variable payload section unit (PDU) field 140 in 0 to 1500 bytes range, when the size of data of PDU field during less than minimum frame size, the MAC layer will append some variable filling character (PAD); And the Frame Check Sequence of 4 bytes (FCS) field 150, to guarantee correct transmission, industry adopts cyclic redundancy check (CRC) to be used for carrying out the valid frame verification.
Be the compatibility of consideration with IEEE 802.3 ethernet standards, EPON only does necessary change on the Ethernet data frame format of IEEE802.3, the schematic diagram of the Ethernet data frame structure that IETF as shown in Figure 3 proposes, its uses 2 byte lengths in ethernet frame PREAMBLE field 100, be used for representing receiving LLID (LLID) field 104 (modes of the pure broadcasting of descending employing of ID of the ONU of ethernet data frame, after the ONU registration, OLT is that registered ONU distributes LLID, arrive the LLID of frame by each ONU monitoring, whether receive this frame with decision, if the LLID that this frame is contained is identical with the LLID of oneself, then receive this frame; Otherwise then abandon).Simultaneously, also comprise the SFD field 102 of 1 byte length of expression frame start-up portion, the crc field 105 of 1 byte length of mistake that is used for checking the PREAMBLE field and the reserved field 103 of 4 byte lengths in the PREAMBLE field 100.Other structure and definition are with reference to aforementioned IEEE802.3 Ethernet data frame structure.
Fig. 4 describes Ethernet data frame structure of the present invention in detail, in the following description, without departing from the spirit and scope of the present invention, can carry out various modifications, interpolation or alternative to respective fields title, position or length in the Ethernet data frame format.
Consider the ethernet data frame format compatible of proposing with IEEE802.3, IETF, it only does necessary change to PREAMBLE field 100, utilizes its part reserved field to represent the type of service/priority tag (PID) of this ethernet data frame data division.With reference to Fig. 4, in this ethernet data frame PREAMBLE field 100: the SFD field 102 of the 1st byte representation frame start-up portion, the 5th byte is as PID field 106,2 byte lengths, be used for representing receiving the LLID field 104 of ID of the ONU of ethernet data frame, the crc field 105 of 1 byte length of the mistake before checking in the PREAMBLE field; Because the ethernet data frame of carrying TDM speech business/video traffic does not have the efficient MAC address, for the compatibility of guarantee agreement, this Ethernet data frame format also comprises sa field 120, the da field 110 that is used to represent source end, destination MAC Address; Equally, it also comprises length/type (LDF/TYP) field 130, payload section unit (PDU) field 140, Frame Check Sequence (FCS) field 150.
In addition, real time business such as TDM speech business/video traffic need accurate recovered clock, do not stipulate OLT up-downgoing frame length among the EPON, the markers precision that the OAM packet of EPON carries may not satisfy the clock that TDM speech business/video traffic requires, therefore, the present invention is by being provided with the traffic descriptor field in the PDU unit 140 of Ethernet passive optical network, this traffic descriptor field can comprise and is used for clock recovery, the time stamp field 141 of 2 byte lengths, represent this packetized digital information sequence number, the packet sequence number field 142 of 4 byte lengths, this packet sequence number 142 can be used for the business recovery of receiving terminal, packet loss retransmits and related service packet loss statistics.Need to prove: traffic descriptor only for as specific professional meaningful such as TDM speech business/video traffic, for traditional Ethernet data business, can not exist.
In ethernet data frame PREAMBLE field, carry out the PID sign by transmitter side, the ONU that receives data utilizes this PID field 106 can recover type of service and the priority tag (PID) that identifies easily, directly forwards business to relevant port and handles; Simultaneously, the business of high priority can not be subjected to the influence of Ethernet current control frame.
At present, in the draft standard of EPON, 5 kinds of OAM frame type definition that are used for EPON have been stipulated, as: Gate (allowing control) frame, Report (request of data) frame, Register_Req (registration request) frame, Register (registration) frame, Regeister_ACK (registration is replied) frame, but it does not comprise the administration configuration that is used for TDM speech business/video traffic and other real time business.For supporting the OAM(Operation Administration Maintenance) of different service types/priority, the present invention further provides a kind of bandwidth allocation request frame, allocated bandwidth mandate frame format that is used for the OAM of Ethernet passive optical network.
As shown in Figure 5, bandwidth allocation request frame of the present invention comprises: PREAMBLE field 200, with identical among Fig. 3; Be used to represent sa field 220, the da field 210 of source end, destination MAC Address; Be used to represent the LDF/TYP field 230 of this frame length/type, its about definite value can be 88-08; Be used to represent the bandwidth allocation request data cell 240 of each grouping information of ONU of bandwidth allocation request, this bandwidth allocation request data cell 240 comprises and corresponding each type of service/priority tag of each grouping information of ONU (PID) solicited message; Be used for writing down the information of Cyclic Redundancy Check so that check frame check sequence (FCS) field 250 of the mistake of bandwidth allocation request frame.
As an embodiment, the bandwidth allocation request data cell 240 of bandwidth allocation request frame of the present invention can comprise following field: the opcode field 241 (its about definite value is 00-03) that is used for representing to carry out the OAM action type; Be used to represent the time stamp field 242 of clock synchronization function between OLT and the ONU; Be used for representing middle each grouping information of the ONU digital section 243 that sends the buffering area grouping information quantity of waiting for of optical network unit (ONU) of bandwidth allocation request; Send ONU each grouping information 244i (i=1,2 of the buffering area grouping information of waiting in the optical network unit (ONU) of expression bandwidth allocation request ...); Be used for each grouping information PID request field 245i (i=1,2 with the corresponding ONU of each grouping information 244i of ONU ...); AGC (automatic gain control) the time field 246 that is used for the control of receiving terminal automatic gain; Be used for receiving terminal and extract the CDR lock field 247 that clock is used.
ONU is by type of service and the demand bandwidth request of bandwidth allocation request frame to the relevant ONU of OLT report, and this provides possibility for OLT provides the differentiation priority service.
As shown in Figure 6, allocated bandwidth mandate frame of the present invention comprises: PREAMBLE field 300, with identical among Fig. 3; Be used to represent sa field 320, the da field 310 of source end, destination MAC Address; Be used to represent the LDF/TYP field 330 of this mandate frame allocated bandwidth data unit length/type; Be used to represent to authorize the allocated bandwidth data cell 340 of each grouping information of ONU, this allocated bandwidth data cell 340 comprises and the corresponding type of service/priority tag of each grouping information of ONU (PID) assignment information; Be used for writing down the information of Cyclic Redundancy Check so that check Frame Check Sequence (FCS) field 350 of the mistake of authorizing frame.
As an embodiment, the allocated bandwidth data cell 340 of allocated bandwidth mandate frame of the present invention can comprise following field: comprise command code (OPCODE) field 341, the time stamp field 342 that is used to represent clock synchronization function between OLT and the ONU that is used to represent to carry out the OAM action type, each grouping information of the ONU digital section 343 that is used to represent to authorize each the grouping information quantity of ONU that sends the upstream data chance; Expression OLT licenses to each grouping information of ONU and carries out ONU packet allocation information 344i (i=1,2 that data transmit ...); With the corresponding ONU of each packet allocation information 344i of ONU each grouping information PID allocation field 345i (i=1,2 ...), be used for the AGC time field 346 that the receiving terminal automatic gain is controlled; Be used for receiving terminal and extract the CDR lock field 347 that clock is used.
According to above Ethernet data frame format and bandwidth allocation request frame, authorize the definition of frame format, the present invention further provides distribution method of dynamic bandwidth:
As shown in Figure 7: at first, in downstream data flow, send ONU report bandwidth permission frame by OLT, so that authorize ONU to send bandwidth request.Whether the LLID in the bandwidth permission frame that each ONU monitoring arrives receives this frame with decision.Send to OLT at ONU report bandwidth permitted hours by the ONU that accepts this mandate frame and to comprise each grouping information of ONU and type of service/priority tag (PID) solicited message thereof at interior bandwidth allocation request frame.OLT receives ONU bandwidth allocation request frame, carries out scheduling by service priority, sends to comprise each grouping information of ONU and type of service/priority tag (PID) assignment information thereof at interior allocated bandwidth mandate frame.By the ONU that accepts allocated bandwidth mandate frame,, send data after the insertion stand-by period according to the allocated bandwidth of authorizing.
The OAM(Operation Administration Maintenance) that dissimilar service needed is different, for example lose responsive service needed data re-transmission, need establishment of connection and demolishing process simultaneously, therefore, except the OAM type of stipulating in the EPON draft standard, can be by expansion OAM type to adapt to the transmission of related service.As in the OAM frame type, the opcode field of expression being carried out the OAM action type defines an about definite value " 00-07 ", represents that this frame is used for OLT transmits specific transactions between ONU administration configuration.
A kind of multi-service data that is used for Ethernet passive optical network OLT and/or a plurality of ONU sends processing method:
As shown in Figure 8, data sending processing flow process of the present invention, with the OLT end is example: at first, step 500, transmitting terminal receives data from the port of different service types, its service port can be TDM speech business port, video traffic port or traditional Ethernet data port, and its corresponding physical layer will be finished signal encoding/decoding and handle.Step 510, the OLT end system is according to the difference of each port traffic type/priority tag (PID), carry out the professional encapsulation 520 of ethernet data frame of the present invention's definition, as at above-mentioned service port, at the MAC layer, the TDM speech business is sealed, video traffic is sealed with carrying out respectively, and encapsulation process comprises traffic descriptor encapsulation that payload section unit (PDU) is set etc.Afterwards, the data after step 530 will encapsulate are carried out corresponding data buffer zone and are filled.Step 540 sends the permission instruction according to OLT, if do not allow to send, system will return step 600; Otherwise system will take out data from corresponding data buffer zone.According to data service type difference (step 550) to be sent, setting comprises type of service/priority tag (PID) in interior ethernet data frame preamble (PREAMBLE) field (step 570), the line data frame of going forward side by side sends (step 580), returns step 500.
If in step 510, if the data service of described port traffic type traditional ethernet can directly be carried out corresponding data buffer zone and fill 530.
Preamble (PREAMBLE) field setting to ethernet data frame comprises LLID (LLID), type of service/priority tag (PID).
This data sending processing further is included in inserting step 560 between step 550, the step 570: according to sending instruction, ethernet data frame payload section unit (PDU) to the real time business type carries out the time stab information setting, and described time stab information can be used for the real time business clock recovery.
A kind of multi-service data receiving handling method that is used for Ethernet passive optical network OLT and/or a plurality of ONU:
As shown in Figure 9, Data Receiving handling process of the present invention: step 600, receiver side receives ethernet data frame from the EPON optical interface, and its corresponding physical layer will be finished signal encoding/decoding and handle.Afterwards, as step 610, the MAC layer reads preamble (Preamble) field, and step 620 is judged its type of service/priority tag (PID) field, if type of service is non-traditional Ethernet service, as other types of service such as TDM speech business/video traffics, then carry out step 630, promptly remove the Ethernet encapsulation, afterwards, the data of step 640 after with decapsulation forward the corresponding service port to and handle, and get back to step 600 after the processing.If the type of service that step 620 is judged is the traditional ethernet business, then enter step 650 and further judge whether this Frame is the OAM frame, it is by reading, judge ethernet data frame length/type (LDF/TYP), if be OAM message, with the OAM Message Processing shown in the execution in step 670, get back to step 600 after the processing.If the non-OAM message of this Frame with regard to execution in step 660, directly is forwarded to corresponding traditional ethernet port with relevant packet and handles, get back to step 600 after the processing.
Below embodiment has been described in detail the present invention in conjunction with the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not constitute limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (16)
1, a kind of multi-service data that is used for Ethernet passive optical network optical line terminal OLT and/or a plurality of optical network unit ONU sends processing method, comprises the steps:
A1), the port from different service types receives data;
B1), carry out receiving data according to type of service: fill the professional encapsulation of ethernet data frame, corresponding data buffer zone; Or directly carry out corresponding data buffer zone and fill;
C1), allow instruction according to sending, from corresponding data buffer zone taking-up data;
D1), according to type of service to be sent, be provided with and comprise type of service/priority tag pid information, and send this ethernet data frame in interior preamble PREAMBLE field.
2, the multi-service data that is used for Ethernet passive optical network optical line terminal OLT and/or a plurality of optical network unit ONU as claimed in claim 1 sends processing method, it is characterized in that step b1) described type of service is if the traditional ethernet data service, and then directly carry out corresponding data buffer zone and fill.
3, the multi-service data that is used for Ethernet passive optical network optical line terminal OLT and/or a plurality of optical network unit ONU as claimed in claim 1 sends processing method, it is characterized in that described steps d 1) preceding also comprising ethernet data frame payload section unit PDU is carried out the time stab information setting, described time stab information can be used for the real time business clock recovery.
4, the multi-service data that is used for Ethernet passive optical network optical line terminal OLT and/or a plurality of optical network unit ONU as claimed in claim 1 sends processing method, it is characterized in that wherein the structure of the ethernet data frame of Chuan Songing comprises:
Preamble PREAMBLE field: comprise the Start Frame Delimiter SFD field that is used for representing the ethernet data frame start-up portion, be used to represent to receive this ethernet data frame optical network unit ONU sign ID LLID LLID field, be used to check the cyclic redundancy check (CRC) field of the mistake of preamble PREAMBLE field;
Be used to represent source address sa field, the destination address da field of source end, destination media interviews control MAC Address;
Be used to represent the length/type LDF/TYP field of packetized digital information length/type;
The payload section unit PDU that is used for loaded packet data information;
Be used for representing that the information of cyclic redundancy check (CRC) is so that check the frame check sequence FCS field of the mistake of ethernet frame;
Be provided with in this ethernet data frame preamble PREAMBLE field with payload section unit PDU in the corresponding type of service of the packetized digital information/priority tag PID field of carrying.
5, the multi-service data that is used for Ethernet passive optical network optical line terminal OLT and/or a plurality of optical network unit ONU as claimed in claim 4 sends processing method, it is characterized in that described type of service/priority tag PID field length is 1 byte.
6, the multi-service data that is used for Ethernet passive optical network optical line terminal OLT and/or a plurality of optical network unit ONU as claimed in claim 4 sends processing method, it is characterized in that being provided with the business description field among the described payload section unit PDU, become by the packet sequence number field groups of the time stamp field that is used for the clock recovery of loaded packet data information with this packetized digital information sequence number of expression.
7, a kind of optical line terminal OLT of Ethernet passive optical network system and/or multi-service data receiving handling method between a plurality of optical network unit ONU of being used for is characterized in that step:
A2), receive ethernet data frame from the Ethernet passive optical network optical interface;
B2), read and comprise type of service/priority tag pid information in interior preamble PREAMBLE field;
C2), according to type of service/priority tag pid information, judge when type of service is non-traditional Ethernet service, then remove the ethernet data frame encapsulation and be forwarded to the corresponding port and handle.
8, the optical line terminal OLT of Ethernet passive optical network system and/or the multi-service data receiving handling method between a plurality of optical network unit ONU of being used for as claimed in claim 7, it is characterized in that step c2) described type of service is if the traditional ethernet data service, then further judge whether it is to run, manage, safeguard OAM message, if, data forward the OAM Message Processing to and partly handle, otherwise, be forwarded to corresponding ethernet port and handle.
9, the optical line terminal OLT of Ethernet passive optical network system and/or the multi-service data receiving handling method between a plurality of optical network unit ONU of being used for as claimed in claim 7, it is characterized in that wherein the structure of the ethernet data frame of Chuan Songing comprises:
Preamble PREAMBLE field: comprise the Start Frame Delimiter SFD field that is used for representing the ethernet data frame start-up portion, be used to represent to receive this ethernet data frame optical network unit ONU sign ID LLID LLID field, be used to check the cyclic redundancy check (CRC) field of the mistake of preamble PREAMBLE field;
Be used to represent source address sa field, the destination address da field of source end, destination media interviews control MAC Address;
Be used to represent the length/type LDF/TYP field of packetized digital information length/type;
The payload section unit PDU that is used for loaded packet data information;
Be used for representing that the information of cyclic redundancy check (CRC) is so that check the frame check sequence FCS field of the mistake of ethernet frame;
Be provided with in this ethernet data frame preamble PREAMBLE field with payload section unit PDU in the corresponding type of service of the packetized digital information/priority tag PID field of carrying.
10, the optical line terminal OLT of Ethernet passive optical network system and/or the multi-service data receiving handling method between a plurality of optical network unit ONU of being used for as claimed in claim 9 is characterized in that described type of service/priority tag PID field length is 1 byte.
11, the optical line terminal OLT of Ethernet passive optical network system and/or the multi-service data receiving handling method between a plurality of optical network unit ONU of being used for as claimed in claim 9, it is characterized in that being provided with the business description field among the described payload section unit PDU, become by the packet sequence number field groups of the time stamp field that is used for the clock recovery of loaded packet data information with this packetized digital information sequence number of expression.
12, a kind of in the Ethernet passive optical network system optical line terminal OLT and the distribution method of dynamic bandwidth between a plurality of optical network unit ONU, comprise the steps:
A3), send ONU report bandwidth permission frame by OLT to ONU, so that authorize ONU to send bandwidth request;
B3), send to OLT at ONU report bandwidth permitted hours by the ONU that accepts report bandwidth permission frame and comprise each grouping information of ONU and type of service/priority tag PID solicited message thereof at interior bandwidth allocation request frame;
C3), OLT receives ONU bandwidth allocation request frame, carries out priority scheduling, send to ONU to comprise each grouping information of ONU and type of service/priority tag PID assignment information thereof at interior allocated bandwidth mandate frame;
D3), by the ONU that accepts allocated bandwidth mandate frame, according to the allocated bandwidth of authorizing, send data after inserting the stand-by period;
Wherein, described type of service/priority tag PID is positioned at the 5th byte of the preamble PREAMBLE field of ethernet data frame.
13, as claimed in claim 12 in the Ethernet passive optical network system optical line terminal OLT and the distribution method of dynamic bandwidth between a plurality of optical network unit ONU, it is characterized in that wherein the structure of the bandwidth allocation request frame of Chuan Songing comprises:
Preamble PREAMBLE field: comprise the Start Frame Delimiter SFD field that is used for representing bandwidth allocation request frame start-up portion, be used to represent to receive this bandwidth allocation request frame optical network unit ONU sign ID LLID LLID field, be used for the cyclic redundancy check (CRC) field of the error checking and correction of PREAMBLE field;
Be used to represent source address sa field, the destination address da field of source end, destination media interviews control MAC Address;
Be used to represent the length/type LDF/TYP field of bandwidth allocation request data unit length/type;
Be used to represent the bandwidth allocation request data cell of each grouping information of ONU of bandwidth allocation request;
Be used for writing down the information of cyclic redundancy check (CRC) so that check the frame check sequence FCS field of the mistake of bandwidth allocation request frame;
It is characterized in that the bandwidth allocation request data cell also comprises and the corresponding type of service of each grouping information of ONU/priority tag PID request field.
14, as claimed in claim 13 in the Ethernet passive optical network system optical line terminal OLT and the distribution method of dynamic bandwidth between a plurality of optical network unit ONU, it is characterized in that described bandwidth allocation request data cell comprises:
Be used for representing to carry out the command code OPCODE field of OAM action type;
Be used to represent the time stamp field of clock synchronization function between OLT and the ONU;
Send an ONU grouping digital section of the buffering area grouping information quantity of waiting among the optical network unit ONU of expression bandwidth allocation request;
Send each grouping information field of ONU of the buffering area grouping information of waiting among the optical network unit ONU of expression bandwidth allocation request;
With each grouping information type of service of the corresponding ONU of each grouping information of ONU/priority tag PID request field;
The automatic gain control time field that is used for the control of receiving terminal automatic gain;
Be used for receiving terminal and extract Clock Extraction field locking time that clock is used.
15, as claimed in claim 12 in the Ethernet passive optical network system optical line terminal OLT and the distribution method of dynamic bandwidth between a plurality of optical network unit ONU, it is characterized in that wherein the structure of the allocated bandwidth mandate frame of Chuan Songing comprises:
Preamble PREAMBLE field: comprise the Start Frame Delimiter SFD field that is used for representing this mandate frame start-up portion, be used to represent to receive this mandate frame optical network unit ONU sign ID LLID LLID field, be used for the cyclic redundancy check (CRC) field of the error checking and correction of PREAMBLE field;
Be used to represent source address sa field, the destination address da field of source end, destination media interviews control MAC Address;
Be used to represent the block length/type LDF/TYP field of allocated bandwidth data unit length/type;
Be used to represent to authorize the allocated bandwidth data cell of each grouping information of ONU;
Be used for writing down the information of cyclic redundancy check (CRC) so that check the frame check sequence FCS field of the mistake of allocated bandwidth mandate frame;
The payload section PDU unit that it is characterized in that bearer authorization information also comprises and each ONU packet allocation information corresponding business type/priority tag PID allocation field.
16, as claimed in claim 15 in the Ethernet passive optical network system optical line terminal OLT and the distribution method of dynamic bandwidth between a plurality of optical network unit ONU, it is characterized in that described allocated bandwidth data cell comprises:
Be used for representing to carry out the command code OPCODE field of OAM action type;
Be used for representing the time stamp field of clock synchronization between OLT and the ONU;
Be used to represent to authorize each grouping information of ONU digital section of each the grouping information quantity of ONU that sends the upstream data chance;
Expression OLT licenses to each grouping information of ONU and carries out each grouping information of ONU that data transmit;
With each grouping information type of service of the corresponding ONU of ONU packet allocation information/priority tag PID allocation field;
The automatic gain control time field that is used for the control of receiving terminal automatic gain;
Be used for receiving terminal and extract Clock Extraction field locking time that clock is used.
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| CNB031512569A CN100355248C (en) | 2003-09-28 | 2003-09-28 | Multiple business realizing method based on ethernet passive optical network |
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| CNB031512569A CN100355248C (en) | 2003-09-28 | 2003-09-28 | Multiple business realizing method based on ethernet passive optical network |
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