CN102223282A - Method for establishing virtual multi-Ethernet channel through optical fibre - Google Patents
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Abstract
The invention discloses a method for establishing a virtual multi-Ethernet channel through an optical fibre, comprising the following steps of: extracting gigabit Ethernet data accessed by a user from a line by a service access unit; converting the gigabit Ethernet data into GMII (Gigabit Media Independence Interface) signal data; transmitting the GMII signal data to a service de-multiplexing and multiplexing unit; simultaneously, converting the GMII signal data output by the service de-multiplexing and multiplexing unit to an Ethernet; after receiving the data output by the service access unit by the de-multiplexing and multiplexing unit, multiplexing the data; simultaneously, adding a synchronous indication signal; transmitting the data to a serial/parallel data codec; and then, converting the parallel data into the serial data; transmitting the serial data to an optical interface module unit, converting the serial data to an optical signal, and sending the optical signal to an optical fibre link. According to the invention, a multi-Ethernet virtual channel is established on a limited optical fibre channel, the bidirectional transmission is realized, the bandwidth required for the data transmission is reduced, the data transmission security requirement is satisfied, and the optical fibre resource is saved.
Description
Technical field
The present invention relates to the data transmission technology in the communication network, be specifically related to set up the method for virtual many ethernet channels by optical fiber.
Background technology
When setting up communication network, the main business that inserts comprises video traffic, data service (audio frequency, asynchronous data and switching value etc.), webmaster business and Ethernet service on the network at present.The data volume of video traffic is very big usually, takies very big bandwidth in network transmission process, needs to adopt the transmission channel of GE to transmit.The common very I of the data volume of webmaster and the data volume of data service is transmitted with the transmission channel that adopts FE.The user has the demand of the access of Ethernet simultaneously.The data flow of video traffic is very big, if do not add control and constraint, can the Ethernet utilized bandwidth to webmaster and user exert an influence in transmission course, need isolate.The user in use needs a 100 m ethernet bandwidth that exclusively enjoys usually simultaneously.According to this demand, the transfer of data main line just needs mutual road GE that isolates of transmission at least and the Ethernet data of two-way FE.
In the prior art, realize the transmission of above a large number of services data, adopt the gigabit Ethernet optical transceiver usually.Gigabit Ethernet light end is directly to convert the gigabit Ethernet electrical interface to optical interface, the equipment that transmits again.The Ethernet optical transceiver mainly comprises following its this construction unit: electric interface unit, UFIU UMSC Fiber Interface Unit, conversion unit of protocol.Electric interface unit is mainly finished local thousand optical Ethernet electrical interfaces and is connected with the optical transceiver electrical interface, converts conversion unit of protocol to.By conversion unit of protocol, the signal of telecommunication that conversion of signals is become the optical interface module can discern sends to far-end by UFIU UMSC Fiber Interface Unit more again.
But the gigabit Ethernet optical transceiver is a pure Ethernet photoelectric conversion module, and circuit transmission effective bandwidth has only 1000M, to data flow transmitted nonrecognition on the circuit, does not distinguish, and can not carry out bandwidth control.The effective bandwidth of 1 road GE+2 road FE has 1200M according to demand, and every kind of service needed is isolated relatively.The gigabit Ethernet optical transceiver all is to satisfy the demands no matter be to be professional isolation aspect from business demand bandwidth band.
In addition, adopt the switching technology that also has industrial gigabit ethernet switch, it is to carry out networking by Ethernet gigabit optical interface, adopts the switching technology of standard ethernet, realizes the mutual of data.Adopt the optical interface of Ethernet, remote two equipment interconnections can be adopted the VLAN isolation technology of Ethernet, realize the isolation of Ethernet service.Each port of gigabit ethernet switch is the Ethernet optical interface or the electrical interface of standard, and port bandwidth is 1000M.Transmit the data service of 1200M, 1 Ethernet optical interface bandwidth is not enough, adopts 2 Ethernet optical interfaces, can realize the business transmission of 2000M, but physically need 2 optical fiber links, and switch need be supported the STP agreement, suppresses the Ethernet broadcast storm.Adopt 2 optical fiber links relatively to waste fiber resource, simultaneously, adopt the Ethernet switch of standard, cost also can rise.
Development along with society, the wire rate of Ethernet is required also more and more higher,, the bandwidth demand of main line network is also more and more had otherness simultaneously according to practical application request, simultaneously when the bigger network bandwidth is provided, bigger requirement has been proposed also for the control of cost.
Summary of the invention
The objective of the invention is to overcome the above-mentioned problems in the prior art, transmission of one line gigabit Ethernet and two-way 100 m ethernet simultaneously are provided, and to customer service confidentiality height, that saves fiber resource a kind ofly sets up the method for virtual many ethernet channels by optical fiber, and its concrete technical scheme may further comprise the steps:
1., GE service access unit extracts the gigabit Ethernet data that the user inserts from circuit, convert the gmii interface signal data to, be transferred to professional tap and Multi-connection unit, the gmii interface signal data with professional tap and Multi-connection unit output is transformed on the Ethernet simultaneously;
2., two-way FE service access unit inserts the two-way 100 m ethernet data that the user inserts, the Ethernet interface chip is transferred to professional tap and Multi-connection unit with the data of Ethernet on the circuit by the MII interface, and the transfer of data of the MII interface of just professional tap and Multi-connection unit output simultaneously is to Ethernet;
3., after tap and Multi-connection unit receive data by GE business unit and the output of two-way FE business unit, the data of three kinds of business are carried out multiple connection, add synchronous indicating signal simultaneously, transfer data to the serial coding decoder again; Tap and Multi-connection unit receive the data that sent by the serial coding decoder simultaneously;
4., after tap and Multi-connection unit receive data, look for synchronously according to the data that receive earlier, according to frame format data are carried out tap again, from data, isolate the data of GE and FE, be transferred to respectively in GE business unit and the two-way FE business unit;
5., the serial coding decoder converts the parallel data of the tap that receives and Multi-connection unit output to serial data, is transferred to the optical interface modular unit; Serial data with the output of optical interface modular unit unit converts parallel data to simultaneously, is transferred to tap and Multi-connection unit;
6., the optical interface modular unit becomes light signal with the transmission data of serial coding decoder by electrical signal conversion, send on the optical fiber link, the light signal that on receive direction optical fiber link is received converts the signal of telecommunication to simultaneously, be transferred in the serial coding decoder, realize the transmitted in both directions of Ethernet data.
Further, in Ethernet transmission, the method for The data data scrambler is transmitted on the line.
Further, at the transmitting terminal of data, ethernet frame keeps the leading of 8 bytes, and frame period is compressed to 2 bytes, frame period is returned to 12 bytes at the receiving terminal of data again, adopts frame period to fill when having valid data to send.
Further, in transmission course, adopt the mode of frame structure to transmit on the link, frame structure is specially: per 253 clock cycle of Frame are formed 1 minimum frame structure, first clock transfer 18bit synchronization character, and synchronization character adopts the position of fixing data locator data frame.
Further, and then the synchronization character back is transmission 100 m ethernet data, adopt the data of low 9bit transmission first via 100 m ethernet business in the 18bit data, high 9bit transmits the data of the second road 100 m ethernet business, transmit the gigabit Ethernet data of 5 clock cycle then, wherein low 9bit transmission earlier in actual serial transmission process, high 9bit data are the back transmission in the actual transmissions process, so alternately 42 times.
Further, described serial coding decoder adopts the 18bit bit wide to carry out the transmission of data, increases 2bit in the transmission course automatically and is used for the indication of serial coding decoder 105 data synchronization.
Further, described serial coding decoder work clock is 75Mhz.
Further, transmitting terminal at described optical fiber link, GE data and two-way FE data send buffer unit data are outputed in the data framing Multi-connection unit, the control of associated counter when finishing framing, the data framing Multi-connection unit is according to the signal of framing time slot control unit output, the ethernet frame synchronizing information is formed complete frame, send to Frame scrambler unit.
Further, after the receiving terminal of described optical fiber link adopts the descrambling of Frame descrambling unit to data, be transferred to the frame synchronization detecting unit, give Frame tap unit with the synchronizing information and the transfer of data behind the descrambling of frame again, after Frame tap unit receives the data and synchronous indicating signal of descrambling, according to synchronous indicating signal, finish the separation of each business datum, and the transfer of data after will separating is given GE Data Receiving buffer unit, first via FE Data Receiving buffer unit and the second road FE Data Receiving buffer unit.
Further, the kernel processor chip of described transmitting terminal and receiving terminal is the FPGA device.
The present invention adopts technique scheme to have following advantage:
1, realized on limited optical-fibre channel, setting up many Ethernets tunnel, and made each passage can both realize the transmitted in both directions of Ethernet data simultaneously, significantly reduced the required bandwidth of multichannel transmission data;
2, each virtual ethernet passage works alone, and each circuit-switched data transport service is isolated, and has satisfied the user to each road business data transmission confidentiality requirement;
3, saved the fiber resource of employed gigabit Ethernet fiber optical transceiver.
Description of drawings
Fig. 1 is the present invention sets up virtual many ethernet channels by optical fiber a schematic flow sheet;
Fig. 2 is that optical fiber link sends the data theory diagram;
Fig. 3 is that optical fiber link receives the data direction theory diagram;
Fig. 4 is an optical fiber link framing structure schematic diagram;
Among the figure: 101-GE service access unit, 102-first via FE service access unit, 103-the second road FE service access unit, 104-tap and Multi-connection unit, 105-serial coding decoder unit, the 106-UFIU UMSC Fiber Interface Unit, the 201-GE data send buffer unit, 202-first via FE data send buffer unit, and 203-the second road FE data send buffer unit, 204-framing time slot control unit, 205-data framing Multi-connection unit, 206-Frame scrambler unit, 301-GE Data Receiving buffer unit, 302-first via FE Data Receiving buffer unit, 303-the second road FE Data Receiving buffer unit, 304-Frame tap unit, 305-frame synchronization detecting unit, 306-Frame descrambling unit.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the method that the present invention sets up virtual many ethernet channels by optical fiber may further comprise the steps: GE service access unit 101 joins with user GE interface, GE service access unit 101 extracts the gigabit Ethernet data that the user inserts from circuit, convert the signal data of gmii interface to, be transferred to professional tap and Multi-connection unit 104; GMII signal data with professional tap and Multi-connection unit 104 outputs is transformed on the Ethernet simultaneously.
First via FE service access unit 102 links to each other with user FE interface with the second road FE service access unit 103, the two-way 100 m ethernet business datum that the user is inserted inserts, and the Ethernet interface chip is transferred to professional tap and Multi-connection unit 104 with the data of Ethernet on the circuit by the MII interface; Finish transfer of data with the MII interface of professional tap and Multi-connection unit 104 outputs simultaneously to Ethernet.
After tap and Multi-connection unit 104 receive data by GE business unit 101 and first via FE service access unit 102 and 103 outputs of the second road FE service access unit, the data of three tunnel business are carried out multiple connection, add synchronous indicating signal simultaneously, transfer data to serial coding decoder 105 again; Receive the data that send by serial coding decoder 105 simultaneously, after tap and Multi-connection unit 104 receive data, look for synchronously according to the data that receive earlier, after finding synchronously, according to frame format data are carried out tap again, from data, isolate the data of GE and FE, be transferred to GE business unit 101 and first via FE service access unit 102 and the second road FE service access unit 103 respectively.
Optical interface modular unit 106, the transmission data of serial coding decoder 105 are become light signal by electrical signal conversion, send on the optical fiber link 107, the light signal that optical fiber link 107 is received converts the signal of telecommunication to simultaneously, is transferred to serial coding decoder 105.
Set up the method for virtual many ethernet channels of 1 road GE data and two-way FE data by optical fiber, realized that each virtual ethernet passage works alone, and each passage can both be realized the transmitted in both directions of Ethernet data simultaneously.
In Ethernet transmission, the method for data scrambler is carried out the transmission of data.Adopt the benefit of data scrambler mode to be not increase extra line bandwidth, reduce the DC level component on the fibre circuit simultaneously, guarantee not produce error code in the transmission course.
After the GE signal converted the signal of GMII to through interface chip, useful signal comprised 1bit enable signal and 8bit data-signal, adopted the 125M clock transfer, and the service bandwidth that gigabit Ethernet need transmit is 1.125G; After the FE signal converts the signal of MII interface to through interface chip, useful signal comprises 1bit enable signal and 8bit data-signal, adopt the 25M clock transfer, because Ethernet all is to be that unit transmits with the byte, first 4bit data that receive on the MII interface and second 4bit data are formed a byte, and corresponding 2bit enables simultaneously effectively; The 2bit of the 3rd 4bit data and a byte correspondence of the 4th 4bit data composition enables simultaneously effectively; By that analogy ...The effective 4bit data of odd number can not appear in transmission course, so in transmission course, first 4bit data and second 4bit data of MII interface can be merged into 8bit data, with 1 enable bit sign, the 3rd 4bit data and the 4th synthetic 8bit data of 4bit data are with 1 enable bit sign.Handle the actual effective bandwidth of using of back 100 m ethernet data and be 112.5M.So total service bandwidth is 1.35G.
According to ethernet standard, Ethernet adopts the mode of packet switching to transmit, and the basic composition unit is an ethernet frame, and the frame length scope of Ethernet is 64 bytes～1522 bytes usually, before each frame the leading of 8 bytes arranged, have the frame period of 12 bytes between frame and the frame at least.The present invention is at the transmitting terminal of data, adopts to keep the leading of 8 bytes, and frame period is compressed to 2 bytes, frame period returned to 12 bytes at the receiving terminal of data again, adopts frame period to fill when having valid data to send.After this mode of process is handled, the actual circuit maximum bandwidth of using of gigabit Ethernet is 1.1177GHz, the actual circuit maximum bandwidth of using of 100 m ethernet is 111.77MHz, in actual design process as long as the maximum line bandwidth that provides of circuit greater than each service circuit requirement, just can be realized the transmission of business.
Maximum utilized bandwidth 111.77MHz during greater than above-mentioned transmission Ethernet.
The utilized bandwidth of distributing to gigabit Ethernet equally is:
Maximum utilized bandwidth 1.1177GHz during equally also greater than above-mentioned transmission gigabit Ethernet.
As shown in Figure 2, state the transmitting terminal of optical fiber link, outside GE gigabit ethernet interface chip sends buffer unit 201 for the GE data of FPGA the transfer of data of gmii interface, data send buffer unit 201 and at first the packet that receives are write in the buffer, after writing one or more complete Ethernet data bags in the buffer in sending buffer unit 201, send buffer unit 201 packet is read, export to next module data framing Multi-connection unit 204.
Outside FE 100 m ethernet interface chip sends buffer unit 202 for the first via FE data of FPGA the transfer of data of MII interface, first via FE data send the data that buffer unit 202 at first becomes the data transaction of 4bit the 8bit bit wide, again packet is carried out in the buffer, in the buffer in the first via FE data transmission buffer unit 202, one or more complete Ethernet data bags have been write, first via FE data send buffer unit 202 packet are read, and export to next module data framing Multi-connection unit 204.
It is identical with function and the implementation that first via FE data send buffer unit 202 that second road FE data send buffer unit 203.The control of associated counter when framing time slot control unit 204 is finished framing.
Data framing Multi-connection unit 205 sends buffer unit 201, first via FE data transmission buffer unit 202, complete frame of the second road FE data transmission buffer unit, 203 ethernet frame synchronizing informations composition according to the signal of framing time slot control unit 204 outputs with the GE data, and then sends to Frame scrambler unit 206.The 206 pairs of data in Frame scrambler unit are carried out scrambler, avoid in the optic path process occurring a plurality of continuous 0 or a plurality of connections 1 o'clock, produce error code in receiving course.
As shown in Figure 3, the receiving terminal of optical fiber link is by optical interface module 106 and serial coding decoder 105, give the receiving terminal kernel processor chip with the data that light path receives, the descrambling of the 306 pairs of data in Frame descrambling unit, then the data behind the descrambling are transferred to frame synchronization detecting unit 305, give Frame tap unit 304 with the synchronizing information and the transfer of data behind the descrambling of frame again.Frame synchronization detecting unit 305 is mainly finished the synchronizing information word that inserts according to transmitting terminal, finishes the detection and localization of frame synchronization information, again with the message identification transmission back Frame descrambling unit 306 that detects.
After Frame tap unit 304 receives the data and synchronous indicating signal of descrambling, according to synchronous indicating signal, finish the separation of each business datum, and transfer data to GE Data Receiving buffer unit 301, first via FE Data Receiving buffer unit 302 and the second road FE Data Receiving buffer unit 303.
After GE Data Receiving buffer unit 301 receives the packet of finishing, with the valid data buffer memory, when a complete packet is arranged in the buffer, the sense data bag, and according to the ethernet packet format of standard, finish the encapsulation of Ethernet data bag, and send on the gigabit Ethernet by gmii interface.
After first via FE Data Receiving buffer unit 302 receives the packet of finishing, with the valid data buffer memory, when a complete packet is arranged in the buffer, the sense data bag, and according to the ethernet packet format of standard, finish the encapsulation of Ethernet data bag, and send on the 100 m ethernet by the MII interface.The function of the second road FE Data Receiving buffer unit 303 is identical with first via FE Data Receiving buffer unit 302 with mode of operation.
Also it should be noted that, this method and the solution of setting up virtual many ethernet channels by an optical fiber link that provides among the present invention, the kernel processor chip of transmitting terminal and receiving terminal all can adopt the FPGA device, and specifically can adopt FPGA is that kernel processor chip is realized.Can utilize the design language of FPGA to realize.Hardware core of the present invention is formed module and is also comprised gigabit Ethernet PHY, 100 m ethernet PHY, SERDES, optical module.FPGA can select the XC3S1600E chip of the Spartan3E series of Xilinx company for use, the FG484 encapsulation, and chip comprises 16000K equivalent gate, has the block RAM of 18K on 36 sheets, has 376 I/O pins.SERDES selects the TLK2521 chip of TI company for use, and the transmission bandwidth scope of chip support is 1G to 2.5G, and in the native system, chip is in the mode of operation of 1.5G bandwidth.Optical module is the 1.5G two-way transmission optical module.
During specific implementation, the designer of this area can merge and decompose functional module mentioned among the present invention according to s own situation and understanding separately, does not specifically explain in detail one by one at this.
Above-mentioned GE is Gigabit Ethernet, gigabit Ethernet;
Above-mentioned FE is Fas t Ethernet, 100 m ethernet;
Above-mentioned SERDES is the serial coding decoder;
Above-mentioned FPGA is Field-Programmable Gate Array, i.e. field programmable gate array.
More than statement is a kind of implementation method of the present invention; only set forth the convenient hypothesis of doing for the design philosophy of this law invention; and be not intended to limit the scope of the invention; every any modification of being made within the spirit and principles in the present invention; be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. set up the method for virtual many ethernet channels by optical fiber for one kind, it is characterized in that may further comprise the steps:
1., GE service access unit extracts the gigabit Ethernet data that the user inserts from circuit, convert the gmii interface signal data to, be transferred to professional tap and Multi-connection unit, the gmii interface signal data with professional tap and Multi-connection unit output is transformed on the Ethernet simultaneously;
2., two-way FE service access unit inserts the two-way 100 m ethernet data that the user inserts, the Ethernet interface chip is transferred to professional tap and Multi-connection unit with the data of Ethernet on the circuit by the MII interface, and the transfer of data of the MII interface of just professional tap and Multi-connection unit output simultaneously is to Ethernet;
3., after tap and Multi-connection unit receive data by GE business unit and the output of two-way FE business unit, the data of three kinds of business are carried out multiple connection, add synchronous indicating signal simultaneously, transfer data to the serial coding decoder again; Tap and Multi-connection unit receive the data that sent by the serial coding decoder simultaneously;
4., after tap and Multi-connection unit receive data, look for synchronously according to the data that receive earlier, according to frame format data are carried out tap again, from data, isolate the data of GE and FE, be transferred to respectively in GE business unit and the two-way FE business unit;
5., the serial coding decoder converts the parallel data of the tap that receives and Multi-connection unit output to serial data, is transferred to the optical interface modular unit; Serial data with the output of optical interface modular unit unit converts parallel data to simultaneously, is transferred to tap and Multi-connection unit;
6., the optical interface modular unit becomes light signal with the transmission data of serial coding decoder by electrical signal conversion, send on the optical fiber link, the light signal that on receive direction optical fiber link is received converts the signal of telecommunication to simultaneously, be transferred in the serial coding decoder, realize the transmitted in both directions of Ethernet data.
2. according to claim 1ly set up the method for virtual many ethernet channels by optical fiber, it is characterized in that: in Ethernet transmission, the method for The data data scrambler is transmitted on the line.
3. the method for setting up virtual many ethernet channels by optical fiber according to claim 1, it is characterized in that: at the transmitting terminal of data, ethernet frame keeps the leading of 8 bytes, frame period is compressed to 2 bytes, receiving terminal in data returns to frame period 12 bytes again, does not adopt frame period to fill when having valid data to send.
4. the method for setting up virtual many ethernet channels by optical fiber according to claim 1, it is characterized in that: in transmission course, adopt the mode of frame structure to transmit on the link, frame structure is specially: per 253 clock cycle of Frame are formed 1 minimum frame structure, first clock transfer 18bit synchronization character, synchronization character adopts the position of fixing data locator data frame.
5. the method for setting up virtual many ethernet channels by optical fiber according to claim 4, it is characterized in that: and then the synchronization character back is transmission 100 m ethernet data, adopt the data of low 9bit transmission first via 100 m ethernet business in the 18bit data, high 9bit transmits the data of the second road 100 m ethernet business, transmit the gigabit Ethernet data of 5 clock cycle then, wherein low 9bit transmission earlier in actual serial transmission process, high 9bit data are the back transmission in the actual transmissions process, so alternately 42 times.
6. the method for setting up virtual many ethernet channels by optical fiber according to claim 1, it is characterized in that: described serial coding decoder adopts the 18bit bit wide to carry out the transmission of data, increases 2bit in the transmission course automatically and is used for the indication of serial coding decoder 105 data synchronization.
7. according to claim 6ly set up the method for virtual many ethernet channels by optical fiber, it is characterized in that: described serial coding decoder work clock is 75Mhz.
8. the method for setting up virtual many ethernet channels by optical fiber according to claim 1, it is characterized in that: at the transmitting terminal of described optical fiber link, GE data and two-way FE data send buffer unit data are outputed in the data framing Multi-connection unit, the control of associated counter when finishing framing, the data framing Multi-connection unit is according to the signal of framing time slot control unit output, the ethernet frame synchronizing information is formed complete frame, send to Frame scrambler unit.
9. the method for setting up virtual many ethernet channels by optical fiber according to claim 1, it is characterized in that: after the receiving terminal of described optical fiber link adopts the descrambling of Frame descrambling unit to data, be transferred to the frame synchronization detecting unit, give Frame tap unit with the synchronizing information and the transfer of data behind the descrambling of frame again, after Frame tap unit receives the data and synchronous indicating signal of descrambling, according to synchronous indicating signal, finish the separation of each business datum, and the transfer of data after will separating is given GE Data Receiving buffer unit, the first via FE Data Receiving buffer unit and the second road FE Data Receiving buffer unit.
10. according to Claim 8 or 9 describedly set up the method for virtual many ethernet channels by optical fiber, it is characterized in that: the kernel processor chip of described transmitting terminal and receiving terminal is the FPGA device.
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| CN102394823A (en) * | 2011-11-03 | 2012-03-28 | 中兴通讯股份有限公司 | Multi-channel aligning de-bias method and device |
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| CN108733617A (en) * | 2018-09-20 | 2018-11-02 | 电信科学技术第五研究所有限公司 | 64 parallel-by-bits of Fibre channel scramble the FPGA implementation method of descrambler |
| CN112738259A (en) * | 2020-12-31 | 2021-04-30 | 广州航天海特系统工程有限公司 | Ethernet data transmission method, device, equipment and storage medium |
| CN115314109A (en) * | 2022-04-12 | 2022-11-08 | 中国人民解放军战略支援部队航天工程大学 | Multichannel optical fiber transmission realized by FPGA |
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Application publication date: 20111019 |