CN1507206A - Transmission method of circuit service in passive light network based on Ethernet - Google Patents
Transmission method of circuit service in passive light network based on Ethernet Download PDFInfo
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Abstract
The present invention relates to transmission method of circuit service in passive light network based on Ethernet, and realizing the comprehensive transmission of circuit service and Ethernet data service can reduce the construction, running and maintenance cost of access network. The transmission method includes writing the circuit service into buffering memory circuit and adapting circuit service data to the data area of the Ethernet MAC frame in the sending side; sending the MAC frame after obtaining sending bandwidth or time interval via transmission line; synchronizing circuit service clock with the fiber line terminal via independent service time label process in the light network unit of receiving side; unpacking to take circuit service data from the Ethernet MAC frame, write into buffer memory circuit and smoothen jitter introduced in data transmitting process; and finally outputting circuit service data in circuit service sync clock, specification and standard.
Description
Technical field
The present invention relates to communication technical field, be specifically related to the method that Circuit Service effectively transmits in based on the EPON (Ethernet Passive Optical Network is abbreviated as EPON) of Ethernet.Be mainly used in the system of EPON system and other Ethernet data business and Circuit Service comprehensive transmission.
Background technology
Circuit Service comprises business such as primary group, quadratic gropup, tertiary group, for example E1/T1 of primary group etc.Circuit-switched service is to propagation delay time and delay variation sensitivity, and the existing packet switching network can not satisfy the requirement of traditional circuit business to time delay and shake.How Circuit Service effectively transmits in Packet Based Network, and especially the effective transmission in the EPON system is a urgent problem.
Because the EPON system bearing is Ethernet service, so in the EPON system, realize the Circuit Service transmission very big difficulty is arranged, actual conditions are in existing EPON technical scheme, all do not relate to the access problem of Circuit Service, also do not have corresponding apparatus to come into operation.
In the packet switching network, provide aspect the Circuit Service, studying at present more in the world is to realize the Circuit Service transmission at three layers on ISO model (IP layer), there has been corresponding product to occur in this respect abroad, but this mode realizes complexity, packaging efficiency is not high yet, and fatal weakness is the service quality (Quality of Service is called for short QoS) that present stage can not guarantee Circuit Service fully.
Circuit Services such as EPON carrying E1/T1 can adopt the scheme that Circuit Service is mapped directly to physical layer transmission, but so, be pure ethernet frame no longer just on the physical layer, can't be compatible with traditional ethernet environment, this will certainly influence the range of application of Ethernet.
Summary of the invention
The objective of the invention is to design the method that a kind of Circuit Service transmits on the EPON based on Ethernet, on EPON based on Ethernet, realize the access of Circuit Service (as E1/T1), and effective transfer circuit business, the Circuit Service of carrier grade service quality when being provided, the Ethernet data business is provided, the comprehensive transmission that realizes Ethernet data business, Circuit Service inserts, and reduces Construction of Access and operation expense.
The technical scheme that realizes the object of the invention is such: the method that a kind of Circuit Service transmits on the EPON based on Ethernet, it is place in circuit business datum on the Ethernet passive optical network of forming by optical line terminal, optical distribution network and a plurality of optical network unit, comprise by the signal of optical line terminal and transmitting to the down direction of optical network unit, with transmit by optical network unit to the signal of the up direction of optical line terminal, it is characterized in that:
The signal of described down direction transmits and comprises following treatment step:
A1. optical line terminal utilizes business clock f
sThe Circuit Service data encapsulation in the data field of ethernet mac frame, is encapsulated ethernet source address, destination address and time tag value 1 simultaneously in the ethernet mac Frame;
A2. optical line terminal carries out the transmission of Circuit Service data M AC frame according to bandwidth and the sending time slots of distributing to the Circuit Service data;
A3. optical network unit is handled by decapsulation and extract the Circuit Service data from Circuit Service data M AC frame;
A4. optical network unit separate traffic time tag method, the clock of employing and system clock are irrelevant, utilize time tag value 1 to generate and the business clock f of optical line terminal
sSynchronous business clock f
S2, the Circuit Service data that output extracts;
The signal of described down direction transmits and comprises following treatment step:
B1. optical network unit utilizes business clock f
S2Circuit data is encapsulated in the data field of ethernet mac frame, simultaneously packaged source address and destination address in the ethernet mac Frame;
B2. optical network unit carries out the transmission of Circuit Service data M AC frame according to bandwidth and the sending time slots of distributing to Circuit Service;
B3. optical line terminal is handled by decapsulation and extract the Circuit Service data from Circuit Service data M AC frame;
B4. optical line terminal utilizes business clock f
s, the Circuit Service data that output extracts.
The present invention has taken all factors into consideration following two kinds of situations: the purpose of EPON bearer service is to realize optical network unit at remote side (Optical Net Unit, be called for short ONU) and local side optical line terminal (OpticalLine Terminal OLT) between the transparent transmission of Circuit Service, and do not require that Circuit Service penetrates metropolitan area network; Then compatible bad in physical layer place in circuit business, and can not guarantee the QoS (illustrating in as background technology) of Circuit Service in IP layer place in circuit business, propose two layers of transmission circuit business.
Method two layers of transmission circuit business of the present invention, promptly the Circuit Service data encapsulation is become the ethernet frame (circuit data mac frame) of standard at transmitting terminal, the unified transmission of other ethernet frames with bearing data service, rely on the dynamic bandwidth allocation algorithm of differentiated service priority again, or, ensure Circuit Service quality (QoS) by connecting the static bandwidth allocation algorithm that configuration guarantees bandwidth; At receiving terminal, the circuit data mac frame is carried out decapsulation handle, thereby recover circuit data.The inventive method, adopt separate traffic time tag method to realize the synchronous of Circuit Service, in the OLT side apparatus, by encapsulating time tag value 1 at the circuit data mac frame simultaneously and in the ONU side apparatus, utilizing this time tag value 1 to generate business clock f with the OLT side apparatus
sSynchronous business clock f
S2, solved the synchronous and timing of transfer circuit data M AC frame between two-end-point.
The method that the present invention adopts can be guaranteed the service quality of Circuit Service, and the technical performance index of Circuit Service interface can satisfy domestic and international related specifications requirement.Distribute bandwidth based on the allocated bandwidth control section in the EPON of Ethernet, guarantee that Circuit Service is not subjected to the influence of other ethernet data frames in transport process.Method of the present invention can be applicable in the system of EPON system and other Ethernet datas business and Circuit Service comprehensive transmission, and, in any network based on Ethernet of method for synchronous of the present invention can be provided, also can both use technical scheme of the present invention.
Description of drawings
Fig. 1 is the position view that local side in EPON (OLT side) Circuit Service inserts part;
Fig. 2 is the position view that far-end in EPON (ONU side) Circuit Service inserts part;
Fig. 3 is that Circuit Service inserts a kind of realization flow schematic diagram in EPON;
Fig. 4 is that the present invention adopts separate traffic time tag method to realize Circuit Service synchronous mechanism and principle schematic of timing between end points.
Embodiment
It is to be finished jointly by the service access port of user side and the service port of local side that Circuit Service inserts, and there is a kind of corresponding relation in these two ports, the connection that different corresponding relations is corresponding different, and like this, local side just can be configured easily and connect.For Circuit Service, can distribute ethernet source address and destination address according to the corresponding relation of professional two end points.
At transmitting terminal, the Circuit Service data that enter among the EPON are write buffer circuit, by the fixing cycle circuit data is carried out the ethernet mac encapsulation, through encapsulation process the Circuit Service data are fitted to ethernet mac (Media Access Control, media access control layer is a sublayer of ethernet data link layer) in the data field of frame; The ethernet mac frame that comprises circuit data arrives transmit port through the exchange process of exchange chip, obtain the transmission bandwidth (or time slot) in this cycle after, send to receiving terminal through transmission line.
At receiving terminal, by exchange chip or by the searching of destination address, determine that this is packaged with the processing unit of the mac frame correspondence of circuit data, and send to and manage the unit herein; Carry out the processing procedure of decapsulation then, the Circuit Service data extract that is encapsulated in the ethernet mac frame is come out, write the caching process circuit, the shake that data transfer procedure is introduced is carried out smoothly; Continuously data are exported at last by the Circuit Service clock synchronous, and by corresponding Circuit Service codes and standards with transmitting terminal.By these processes, realize the transparent transmission of Circuit Service in EPON.
Referring to Fig. 1, Fig. 2, illustrate that Circuit Service inserts the position of part in EPON.The OLT side adopts frame mode shown in Figure 1, the OLT side of EPON mainly includes CPU module 11, Switching Module 12, PON interface module and system control module 13 between light signal (PON interface) and ethernet signal (Ethernet interface), and ethernet interface module (gigabit/100 m ethernet interface and Ethernet interface) 14, Circuit Service of the present invention inserts part 15 and sends multiplex circuit data to Switching Module 12, Circuit Service inserts part 15 and mainly comprises the circuit interface module, functional modules such as Circuit Service adaptation module and ethernet interface module, and 13 of modules to obtain Circuit Service by the Circuit Service synchronization module synchronous.The design of ONU lateral circuit service access part can be identical with the design of OLT side fully, just adopts the structure shown in Fig. 1.But in the specific implementation process,, can adopt structure shown in Figure 2, in ONU side structure shown in Figure 2, not have Switching Module 12 in order to reduce the cost of ONU side.
Circuit Service inserts part 15 and maps directly to Ethernet physics (MAC) layer, transtation mission circuit business datum and will comprise valid data in the mac frame of Circuit Service data and extract and send to the circuit interface module.The PON interface module be responsible for and optical fiber between the transmitting-receiving of ethernet mac frame; The Circuit Service synchronization module realizes that the Circuit Service clock and the OLT side of ONU side is synchronous.
Referring to Fig. 3, the main functional modules that the inventive method shown in the figure is related and the idiographic flow of realization thereof.The EPON system comprises OLT side apparatus 18, optical distribution network (ODN) 10 and a plurality of ONU side apparatus 20.
The structure that OLT side 18 and ONU side 20 are common, comprise Circuit Service interface processing module 1,14, adaptive encapsulation process part 2,17, synchronously with clock treatment circuit 3,12, Circuit Service control and OAM (operation with manage) module 4,16, sending controling circuit 5,15, send associated processing circuit 6,19, decapsulation processing section 7,13, Ethernet receiving processing circuit 9,11, wherein OLT side 18 also comprises an exchange processing section 8.
Behind the system initialization, the Circuit Service control of the control of the Circuit Service of OLT side and OAM module 4, ONU side and OAM module 16 responsible with the communicating by letter and Message Processing of system network management, dispose adaptive encapsulation process part 2 and 17 according to the requirement of system network management, the port of OLT and ONU two ends being opened Circuit Service couples together by the form of ethernet source address and destination address, and handles alarm and wait other OAM information.So, adaptive encapsulation process part 2,17 just can be encapsulated into circuit data in the ethernet mac frame according to the source ethernet address and the destination address that obtain.
The ethernet source address and the destination address of encapsulation, be when system initialization, distribute by systems soft ware according to the corresponding relation of Circuit Service between optical line terminal and optical network unit two-end-point by system network management, and be kept in the local storage in optical line terminal and the optical network unit.At system's normal operating phase, webmaster also can be adjusted or be reconfigured the corresponding relation of Circuit Service between optical line terminal and optical network unit two-end-point by same method.
As shown in the figure, the signal of being finished down direction by the descending transtation mission circuit of OLT (partial circuit in the equipment 18) and the descending receiving circuit of ONU (partial circuit in the equipment 20) and optical distribution network (ODN) 10 transmits, and promptly OLT side to the signal of ONU side direction transmits.
This signal transport process is: circuit data enters the OLT side apparatus 18 of EPON through Circuit Service interface processing module 1;
Adaptive encapsulation process part 2 obtains circuit data, 1-from 1〉2;
In adaptive encapsulation process part 2, at Circuit Service control and OAM modular service clock f
sControl under, the time T in an encapsulation cycle of circuit data elder generation buffer memory, then with these data encapsulation in the data field of ethernet mac frame.The map addresses information that writes in the time of will reading initialization from local storage in the encapsulation process writes source address and destination address in the mac frame; MAC data field length value is write the length/type byte of ethernet mac frame; Time tag value 1 synchronous and that clock treatment circuit 3 produces is encapsulated in the mac frame; Calculate and insert Frame Check Sequence (FCS); The MAC Frame that will encapsulate by the definition form of ethernet mac frame sends to exchange processing section 8,2-at last〉8.
In EPON, realize the access of Circuit Service, must guarantee that Circuit Service is synchronous in the timing that receives and send two ends.Realize that regularly synchronous basic skills is a time tag value method, two kinds of different application forms can be arranged when specific implementation: a kind of is that direct Circuit Service to single channel provides the time tag value, and each road business is carried out Synchronous Processing respectively; Another be the multiplex circuit service integration that will insert be high order block business (for example, 4 road E1 are multiplexed with the quadratic gropup of 8Mbit/s), adopt time tag value method to realize regularly synchronously to high order block, carry out the Circuit Service of multiplexed Circuit Service and opposite end tap recovery like this and also just realized regularly synchronously;
In exchange processing section 8, under the control of Circuit Service control and OAM module 4, according to target MAC (Media Access Control) address, different Ethernet datas is exchanged to different ports, and (mac frame that will encapsulate circuit data exchanges to a certain port, other mac frames that do not have the encapsulated circuit data with difference), the mac frame that has encapsulated circuit data is sent to sending controling circuit 5,8-〉5;
Sending controling circuit 5 sends to transmission associated processing circuit 6,5-according to the bandwidth of distributing to circuit data and sending time slots with data〉6.The QoS of Circuit Service mainly realizes by bandwidth assurance and some other ancillary method.Bandwidth wherein guarantees, adopt the EPON system of Dynamic Bandwidth Allocation mechanism, in all downlink datas of OLT side, the priority of ethernet mac frame (be called for short Circuit Service data M AC frame) that has encapsulated Circuit Service is the highest, the priority that sends is also the highest, when sending controling circuit 5 has detected Circuit Service data M AC frame, checks whether send buffering area has data to send, if do not have data to send, then begin transtation mission circuit business datum mac frame; If there are data to send, current transmission frame is not blocked, treat this frame send finish after, i.e. transtation mission circuit business datum mac frame.
Send associated processing circuit 6, carry out parallel/serial conversion, 8B/10B encoding process and electricity/light conversion after, deliver to optical distribution network (ODN) 10,6-〉10, be transferred in the Ethernet receiving processing circuit 11 of ONU side apparatus 20 10-at last〉11;
Ethernet receiving processing circuit 11, under the control of Circuit Service control and OAM module, with the data forwarding of different service types to different module (being used to distinguish other mac frames that do not have the encapsulated circuit data and the mac frame that has encapsulated circuit data), forward the mac frame that has encapsulated circuit data to decapsulation processing section 13,11-〉13 and the time tag value 1 that extracts the OLT example send synchronously and clock treatment circuit 12;
Circuit Service interface processing module 14 is exported circuit data by corresponding ports, thereby finishes the descending transparent transmission of circuit data in the EPON system.
As shown in Figure 3, the signal of being finished up direction by the up transtation mission circuit of ONU (partial circuit in the equipment 20) and the up receiving circuit of OLT (partial circuit in the equipment 18) and optical distribution network (ODN) 10 transmits, and promptly the signal of ONU to OLT direction transmits.
Circuit data process Circuit Service interface processing module 14 enters the ONU side apparatus 20 of EPON, and adaptive encapsulation process part 17 obtains Circuit Service data, 14-from 14〉17;
In adaptive encapsulation process part 17, under the control of Circuit Service control and OAM module, the time T in an encapsulation cycle of circuit data buffer memory, then with these data encapsulation in the data field of ethernet mac frame.The map addresses information that writes in the time of will reading initialization from local storage in the encapsulation process writes source address and destination address in the mac frame; Calculate and insert Frame Check Sequence (FCS); Utilize business clock (f synchronous and that clock treatment circuit 13 produces
S2), send to sending controling circuit 15,17-by the circuit data mac frame after the definition form encapsulation of ethernet mac frame by adaptive packed part 17〉15;
Sending controling circuit 15 comprises the mac frame of circuit data to sending associated processing circuit 19,15-according to the bandwidth of distributing to circuit data and sending time slots transmission〉19.In the up process of transmitting of ONU, guarantee that by allocated bandwidth mechanism the circuit data mac frame sends bandwidth, after the bandwidth that obtains to be distributed the circuit data mac frame is sent to OLT.In the EPON that adopts static bandwidth allocation, by connecting the configuration process Circuit Service, just the bandwidth fixed of Circuit Service is got off, OLT and ONU circuit data mac frame delivery time are fixed after the realization system synchronization, like this, the circuit data mac frame can periodically send, and this is a kind of very strong QoS safeguard measure.Other measure that QoS guarantees comprises: the circuit data mac frame has limit priority at the exchange chip place, priority realizes by inserting Virtual Local Area Network priority, after the circuit data mac frame arrives the receiving terminal decapsulation, buffer memory certain hour in memory, the shake that Ethernet packet form load mode is brought is carried out smoothly delay variation fully smoothly being fallen;
Send associated processing circuit 19, carry out parallel/serial conversion, 8B/10B encoding process and electricity/light conversion after, deliver to optical distribution network (ODN) 10,19-〉10, be transferred to the Ethernet receiving processing circuit 9 of OLT side apparatus 18 up receiving circuits, 10-at last〉9;
Ethernet receiving processing circuit 9 is realized the ethernet physical layer processing, and the data after will handling then send to exchange processing section 8,9-〉8;
Through exchange processing section 8, under the control of Circuit Service control and OAM module, the mac frame that is packaged with circuit data is switched to decapsulation processing section 7,8-〉7;
Decapsulation processing section 7 under the control of Circuit Service control and OAM module, extracts the effective circuit data, and this part data is sent to the local storage buffer memory from the MAC Frame, come level and smooth delay variation by the data of buffer memory different cycles; Utilize business clock (f synchronous and that clock treatment circuit 3 provides then
s), order reading of data from memory, and export to Circuit Service interface processing module 18,7-〉18;
Circuit Service interface processing module 18 is exported circuit data by corresponding ports, thereby finishes the up transparent transmission of circuit data in the EPON system.
The present invention shown in Fig. 4 utilizes separate traffic time tag method to realize Circuit Service synchronous principle between two end points (OLT and OUN).Clock that this separate traffic time tag method is adopted and system clock are irrelevant.In EPON, the Circuit Service clock of each ONU should be synchronized with the Circuit Service clock of OLT side.
The structure of the synchronous and clock treatment circuit 3 of OLT side apparatus comprises OLT Circuit Service clock (f
s) produce circuit 41, frequency multiplier (clock of generation time label value 1) 42, counter 43, time tag value 1 reads transtation mission circuit 45 and time tag value 1 sending controling circuit 44; The structure of the synchronous and clock treatment circuit of ONU side apparatus comprises ONU Circuit Service clock (f
S2) generation circuit 51, local clock (f
Ts2) produce circuit 52, controlled counter 53 (generation time label value 2), frequency division controller 54, time tag value 1 and the difference calculating circuit 55 of time tag value 2 and the receiving processing circuit 56 of time tag value 1.
Time tag value 1 is to obtain by the output valve that reads counter 43, and the drive clock of this counter 43 is business clock frequency (f
s) positive integer (f doubly
Ts), each clock cycle counter 43 is counted once formation time label value 1 (OLT time tag timestamp)).
Realize that synchronous basic principle is: the OLT side is utilized business clock f
sCarry out frequency multiplication, obtain time tag clock f
TsA certain 8 digit counters 43 calculate f
TsThe periodicity of clock process, rise time label value 1 under the control of time tag value 1 sending controling circuit 44, sends to the ONU side by reading transtation mission circuit 45 with time tag value 1.The transmission of time tag value 1 can transmit by special mac frame, also can transmit together with the mac frame that comprises circuit data or other webmaster class mac frame;
On ONU side apparatus circuit board, f is arranged
Ts2Local clock, f
Ts2With time tag 1 clock f
TsNominal frequency identical, by a frequency division controller 54 control to f
Ts2Divider ratio during frequency division obtains business clock f
S2There are 8 controlled counters 53 simultaneously, by local clock f
Ts2Drive, this controlled counter 53, output generates the time tag value 2 of ONU side; When the ONU side apparatus receives the time tag value 1 of OLT side by receiving processing circuit 56, read local zone time label value 2, time tag difference calculating circuit 55 compares the acquisition difference to these two numerical value, utilizes this difference to be changed to the value of the controlled counter 53 of ONU identical with time tag value 1; Difference after will comparing is simultaneously given frequency division controller 54, and frequency division controller 54 is according to the concrete parameter of difference acquisition adjustment frequency division controller 54 frequency divisions, and the control divider ratio obtains business clock f
S2, the Circuit Service clock f of realization ONU and OLT side
sWith f
S2Synchronously.
With the example that is transmitted as of E1 circuit signal, further specify the process that circuit data is encapsulated in formation circuit data mac frame in the mac frame of technical solution of the present invention below.Two kinds of implementations are arranged:
First kind of mode:, carry out the ethernet mac encapsulation respectively for each road E1 at transmitting terminal; Behind the exchange process and the circuit (10) between OLT and ONU of E1 Frame after the encapsulation (having encapsulated the ethernet mac frame of E1 data) through exchange processing section (8) exchange chip, arrive receiving terminal; At receiving terminal, the E1 Frame after the encapsulation is carried out decapsulation, extract the E1 valid data, do caching process; The synchronous business clock of utilization and transmitting terminal sends E1 then.This mode all will provide the synchronous service clock respectively to each road E1, adopts time tag value method to realize synchronously; If a few roads E1 data are from same switch, these several roads E1 data can shared one road synchronous service clock so.
The second way: this mode is utilized the quadratic gropup process chip, with the quadratic gropup data flow that 4 road E1 are multiplexed with one road 8.448Mbit/s, then this quadratic gropup data flow is carried out Ethernet encapsulation (is the E1 Frame hereinafter to be referred as this mac frame).This mode is only required and is realized on the signal of 8.448Mbit/s synchronously, just can guarantee that each road E1 is synchronous in the OLT of EPON side and ONU side, adopts time tag value method to realize the 8.448Mbit/s quadratic gropup data synchronization of OLT and ONU.When connecting configuration process, distribute bandwidth after, send fixed-site.The E1 Frame has limit priority at the exchange chip place, and priority is to insert Virtual Local Area Network priority at the port of exchange chip to realize.After OLT or ONU receive the E1 Frame of opposite end, carry out decapsulation and handle, extract write memory buffer memory after the quadratic gropup data, the buffer memory regular hour, carry out the level and smooth of delay variation; Utilize and the synchronous 8.448MHz clock of transmitter side, the data with 8.448Mbit/s from buffer area write the quadratic gropup treatment circuit, recover 4 road E1 data by the quadratic gropup treatment circuit again.
At this moment, quadratic gropup is done source address and the destination address that the MAC encapsulation time is used, and is webmaster acquisition when dispose by systems soft ware.By the Circuit Service port corresponding relation at network management configuration OLT and ONU two ends, after the configuration, the source MAC of port and the target MAC (Media Access Control) address of correspondence are sent to the respective handling circuit.
Method of the present invention is to realize the access technology of Circuit Service at the ethernet mac layer, is that the EPON system is many The important component part of service access has realized that technically circuit-switched service is in Packet Based Network in the EPON system In transmission problem, satisfy time delay and the delay variation requirement of Circuit Service, solved the synchronization timing problem, The Circuit Service of telecom service quality is provided in connectionless Packet Based Network. Conceptual design among the present invention and Main modular has reusability, compatible OLT and ONU both sides, compatible static bandwidth allocation algorithm (SBA) and The EPON system of dynamic bandwidth allocation algorithm (DBA), compatible EPON system and other Ethernet, circuit industry The system of affair comprehensive transmission.
Method of the present invention can be guaranteed the service quality (QoS) of Circuit Service, the technology of Circuit Service interface Performance indications can satisfy domestic and international related specifications requirement, and the method for synchronous in the inventive method can be applied in In any network based on Ethernet.
Claims (16)
1. method that Circuit Service transmits on the EPON based on Ethernet, it is place in circuit business datum on the Ethernet passive optical network of forming by optical line terminal, optical distribution network and a plurality of optical network unit, comprise by the signal of optical line terminal and transmitting to the down direction of optical network unit, with transmit by optical network unit to the signal of the up direction of optical line terminal, it is characterized in that:
The signal of described down direction transmits and comprises following treatment step:
A1. optical line terminal utilizes business clock f
sThe Circuit Service data encapsulation in the data field of ethernet mac frame, is encapsulated ethernet source address, destination address and time tag value 1 simultaneously in the ethernet mac Frame;
A2. optical line terminal carries out the transmission of Circuit Service data M AC frame according to bandwidth and the sending time slots of distributing to the Circuit Service data;
A3. optical network unit is handled by decapsulation and extract the Circuit Service data from Circuit Service data M AC frame;
A4. optical network unit adopts separate traffic time tag method, and the clock of employing and system clock are irrelevant, utilizes the business clock f of 1 generation of time tag value and optical line terminal
sSynchronous business clock f
S2, the Circuit Service data that output extracts;
The signal of described up direction transmits and comprises following treatment step:
B1. the art network element is utilized business clock f
S2Circuit data is encapsulated in the data field of ethernet mac frame, simultaneously packaged source address and destination address in the ethernet mac Frame;
B2. optical network unit carries out the transmission of Circuit Service data M AC frame according to bandwidth and the sending time slots of distributing to Circuit Service;
B3. optical line terminal is handled by decapsulation and extract the Circuit Service data from Circuit Service data M AC frame;
B4. optical line terminal utilizes business clock f
s, the Circuit Service data that output extracts.
2. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: among described steps A 1, the B1, the ethernet source address and the destination address of encapsulation, be when normally moving at system initialization or in system, distribute by systems soft ware according to the corresponding relation of Circuit Service between optical line terminal and optical network unit two-end-point or adjust, reconfigure by system network management, and be kept in the local storage in optical line terminal and the optical network unit.
3. the method that a kind of Circuit Service according to claim 2 transmits on the EPON based on Ethernet, it is characterized in that: be by control of the Circuit Service in optical line terminal and the optical network unit and 0AM module, by with the communicating by letter and Message Processing of system network management, dispose adaptive encapsulation process part according to the requirement of system network management, the port of optical line terminal and optical network unit two ends being opened Circuit Service couples together by described ethernet source address and destination address.
4. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that among described steps A 1, the B1, be first, and then the Circuit Service data periodically encapsulated by this encapsulation cycle with the Circuit Service metadata cache time in an encapsulation cycle.
5. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet is characterized in that among described steps A 1, the B1, and described encapsulation also comprises inserts Frame Check Sequence and length/type byte.
6. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet is characterized in that in the described steps A 1, and encapsulation time tag value 1 is to provide time tag value 1 at the oneway circuit business.
7. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that in the described steps A 1, encapsulation time tag value 1 is that the high order block Circuit Service after multiplexing provides time tag value 1 at Circuit Service.
8. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: in the described steps A 2, the time tag value 1 that sends, transmit by special mac frame, perhaps transmit, perhaps transmit with other webmaster class mac frame with the mac frame that comprises the Circuit Service data.
9. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet is characterized in that: the time tag value 1 in the described steps A 1 is by business clock f
sThrough frequency multiplication rise time label clock f
Ts, again by counter label computing time clock f
TsThe periodicity of process obtains time tag value 1.
10. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: among described steps A 1, the B3, be by the exchange processing section, according to target MAC (Media Access Control) address the Circuit Service data M AC frame that encapsulates is exchanged to predetermined port, this port does not transmit the ethernet frame of bearing data service.
11. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: among described steps A 2, the B2, described Circuit Service data M AC frame is to transmit with ethernet frame unification under system's control of bearing data service.
12. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: among described steps A 2, the B2, adopt Dynamic Bandwidth Allocation mechanism to distribute bandwidth to Circuit Service, the ethernet mac frame that has encapsulated the Circuit Service data has the highest transmission priority.
13. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: among described steps A 2, the B2, adopt static bandwidth allocation mechanism to distribute fixing bandwidth to Circuit Service, the ethernet mac frame that has encapsulated the Circuit Service data periodically sent in the fixing moment.
14. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: in the described steps A 3, Circuit Service data M AC frame after the encapsulation by searching destination address, is determined the processing unit of the corresponding optical network unit of transmission.
15. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet, it is characterized in that: among described steps A 3, the B3, the Circuit Service data that extract send to the local storage buffer memory earlier, carry out the smoothing processing of delay jitter.
16. the method that a kind of Circuit Service according to claim 1 transmits on the EPON based on Ethernet is characterized in that: adopt the independent time labeling acts to generate and f in the described steps A 4
sSynchronous business clock f
S2Further comprise: generate a nominal frequency and time tag clock f
TsIdentical local clock f
Ts2By local clock f
Ts2Drive a controlled counter, rise time label value 2; Computing time 2 of label value 1 and time tag values difference, be changed to the time tag value 2 of controlled counter output identical and utilize this difference adjustment frequency division controller with this difference f with time tag value 1
Ts2Divider ratio obtain business clock f
S2
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| CNB021539286A CN1241363C (en) | 2002-12-06 | 2002-12-06 | Transmission method of circuit service in passive light network based on Ethernet |
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| CNB021539286A CN1241363C (en) | 2002-12-06 | 2002-12-06 | Transmission method of circuit service in passive light network based on Ethernet |
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| CN1507206A true CN1507206A (en) | 2004-06-23 |
| CN1241363C CN1241363C (en) | 2006-02-08 |
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