CN1392684A - Wavelength division multiplexing optical network transmission adapting method for IP data - Google Patents
Wavelength division multiplexing optical network transmission adapting method for IP data Download PDFInfo
- Publication number
- CN1392684A CN1392684A CN01118819A CN01118819A CN1392684A CN 1392684 A CN1392684 A CN 1392684A CN 01118819 A CN01118819 A CN 01118819A CN 01118819 A CN01118819 A CN 01118819A CN 1392684 A CN1392684 A CN 1392684A
- Authority
- CN
- China
- Prior art keywords
- data
- wavelength division
- processing module
- optical network
- gigabit ethernet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
This invention relates to a wave-division multiple (WDM) optical network transmission adaptive method for IP data. Transmitted data operate on processing of multiplexing/demultiplexing, framing/unframing and detecting/correction between the loaded IP data giga ratio Ethernet and WDM optical network. The WDM optical entwork transmission equipments monitor IP instead of ATM and SDH equipments realizing the effective transmission of IP data on WDM optical network, so avoiding too much overhead expense and complicated operation.
Description
The present invention relates to a kind of Wavelength division multiplexing optical network transmission adapting method of IP data, especially refer to a kind ofly carry out multiplexing/demultiplexing, framing/tear open the processing of frame and verification/error correction by between Gigabit Ethernet processing module and Wide Area Network interface processing module, utilizing core processing module will be transmitted data, and the method for the wavelength division multiplexed optical network transmission adaptive (IP over WDM) of the IP data of IP being monitored to wavelength division multiplexed optical network transmission adapting appts by system control module and management and monitoring module belongs to computer network and optical transfer network technical field.
From being born until today, the main business of telecommunications network is a telephone service always, thereby telecommunications network generally is also referred to as telephone network.The design of traditional electrical phone network all is that speech channel amount with constant symmetry is a prerequisite, its cost and profit are under the strict control, it is capital-intensive that network is, and has the consistency of height between network capacity and the traffic capacity, and telephone service and communication network all are the growth of stablizing low speed.Over nearly 10 years, whole world telephone subscriber's growth rate average out to about 5%～10%.
But along with the extensive use of computer with popularize, data service presents the growing trend of exponential form; Average annual growth rate reaches 25%～40%, is higher than telephone service far away.Along with the Internet transfer protocol (Internet Protocol, hereinafter to be referred as IP) growth of professional explosion type ground, the scale of its network and traffic carrying capacity have reached about stage of just doubling in about 6～12 months, also want fast 1.5～3 times than the Moore's Law (just doubling in about about 18 months) of famous cpu performance progress.Obviously, by this trend, have more than is needed several years, online data service will surpass telephone service.In the North America, the data service on some network (such as pacific bell) has surpassed telephone service, even if picture AT﹠amp; The network of the old brand telecommunications company that T is such, its data service also will surpass telephone service after several years.From worldwide, estimate in 10 years of future, comprise that the data business volume of the main network in the world of China Telecom's net all will successively surpass telephone business volume, Figure 1 shows that the development trend of speech business and data service.Finally, the business of telecommunications network will mainly be made of data service, rather than telephone service, and the phone main business of telecommunications network becomes sideline production the most at last since 100 years, and the business of communication network constitutes the variation that essence will take place.
Meanwhile, the appearance of wavelength division multiplexing (being designated hereinafter simply as WDM) method has changed the looks of transmission network.This method utilization has the monomode fiber of broadband low loss characteristic, adopts a plurality of wavelength as the information carrier channel, and each channel is transmission simultaneously in an optical fiber, makes the capacity of transmission system obtain very big growth.Simultaneously, since the WDM transmission network just from Point-to-Point system to web development, therefore, can be by on the crossover node of arterial grid, introducing optical cross connect and optical wavelength conversion, form " empty wavelength " path between end-to-end, realize the user end to end the wavelength link connect.This will make allotment and switching between the circuit become simple and convenient, and then form an optical-fiber network layer based on wavelength-division multiplex technique and optical wavelength switching technology, simplified network configuration, improved network reliability, and made transmission network and its business and carrying signal irrelevant.It has been recognized that at present wavelength division multiplexed optical network is the transmission network that can satisfy present IP operation enormous bandwidth demand, it will become the basis of new generation broadband data network.
In the IP local area network (LAN), Gigabit Ethernet (being designated hereinafter simply as GbE) is a kind of very important technology.It is to grow up on the basis of 10M/100M ethernet technology, and therefore, it has inherited the mechanism such as frame format, flow control of traditional ethernet, can realize seamless link and smooth upgrade with original Ethernet.Because the local area network (LAN) of the whole world more than 80% all adopts Ethernet or Fast Ethernet at present, the Gigabit Ethernet equipment cost is cheap relatively in addition, and technology is simply efficient, and therefore, Gigabit Ethernet has been subjected to all big enterprises and users' welcome.
And aspect wide area network, traditional IP transfer scheme relies on the asynchronous transfer mode (AsynchronousTransfer Mode is designated hereinafter simply as ATM) and the mode of synchronous digital hierarchy (hereinafter to be referred as SDH) to finish the exchange and the transmission of backbone network.Because this dual mode is not to design for transmitting IP operation, therefore when carrying IP flow, its performance is not optimum, and exists following defective:
1, networking and maintenance cost height need be set up IP, ATM, SDH even wavelength division multiplexed network simultaneously; Especially the equipment of ATM and SDH and port are very expensive.
2, network function is overlapping, and the function between each layer of network exists overlapping, and between the exchange routing function such as the routing function of IP layer and ATM layer, monitoring of the transmission quality of SDH and WDM layer and protection are switched etc.Overlapping functions of the equipments and the cost waste of not only meaning of function also brought the difficulty of network interworking and integrated management.
3, bandwidth availability ratio is lower, during the ATM bearing IP packet, owing to have the adaptive of ATM the 5th class adaptation layer (being designated hereinafter simply as AAL5) and letter header overhead, has brought the bandwidth loss more than 20%; And SDH is a kind of time-multiplexed technology, and the shared bandwidth of its each passage is fixed, and data network service has very big sudden and asymmetry, and bandwidth waste is unavoidable.
In the new generation broadband data network, network layer adopts the IP agreement, and physical layer is used wavelength-division multiplex technique (IP over WDM technology) trend of the times, if still use ATM and SDH network and equipment between them, will inevitably bring above all drawbacks.At present usually the method for the IP network networking of adopting has: utilize method that conventional router transmits, the GbE method to the method for SDH and GbE to WDM.
As shown in Figure 2, the method that traditional router is transmitted utilize IP to ATM or IP to the technology of SDH, Ethernet is linked on the high-performance router that has been equipped with the wide-area transmission interface, after the router taking-up IP data, on trunk transit network, transmit by the wide area port.Present long-distance transmission mainly relies on the SDH technology, and the wide-area transmission interface of router is generally ATM or packets of information arrives SDH (Packet overSDH is designated hereinafter simply as POS) interface; The shortcoming of this method is:
1, cost costliness, the cost of P equipment and port are extremely expensive, generally have only the carrier class high-performance router just can dispose ATM or POS port.
2, routing function redundancy, a lot of the 3rd layer of (IP layer) switch all have the 3rd layer of (IP layer) disposal ability and the shortest preferential routing mechanisms such as (being designated hereinafter simply as OSPF) of open approach at present, therefore, from routing function, high performance router is not indispensable.
3, increase data processing and time-delay, router all will carry out the 3rd layer of processing to each IP datagram literary composition, has therefore increased time-delay and shake that data transmit inevitably.
The SDH transmission network is present main long-distance Backbone Transport Network network, it is a kind of communication network towards traditional voice transmission, and main access service speed is followed PDH (Pseudo-synchronous Digital Hierarchy) (being designated hereinafter simply as PDH), synchronous transfer module (being designated hereinafter simply as STM) sequence standard; But along with the extensive employing of SDH system, and the explosive increase of various data service flows, very general by the SDH bearing data service.Defined at present the standard of on SDH, shining upon ATM cell and IP datagram.Equally, because the demand of Gigabit Ethernet wide-area transmission constantly increases, arise at the historic moment by the technology of SDH carrying Gigabit Ethernet signal.As shown in Figure 3, Figure 4, GbE to the method for SDH by the POS technical transform, it adopts protocol stack and the mapping method of similar POS, and its advantage is: no longer need high-end router and POS port thereof just can realize that the wide area of Gigabit Ethernet signal transmits the investment of having saved router device; Rely on SDH that reliable wide-area transmission quality is provided.But this method exists following deficiency simultaneously:
1, it also needs SDH network and equipment support, and present most of SDH equipment does not have the Gigabit Ethernet port, and therefore, its range of application is restricted.
2, mapping is handled complicated, the information rate of Gigabit Ethernet is 1Gbit/s, and the speed of STM sequence is 155,622 and 2488Mbit/s, in order not cause the waste of bandwidth, need to adopt the 4th grade of virtual container (being designated hereinafter simply as VC4) concatenation technology effectively to hold one road Gigabit Ethernet signal, its mapping process more complicated.
3, the design of SDH is adopted synchronous multiplexing mode encapsulation of data message and improper based on the design of 8KHz speech synchronized sampling; And the encapsulation process of data message is more consuming time, the equipment price costliness.
4, SDH has the expense that much is used for the speech net in addition, has brought bigger bandwidth and operation cost.
WDM utilizes the broadband low loss characteristic of monomode fiber, adopts a plurality of wavelength as the information carrier channel, and each channel is transmission simultaneously in an optical fiber.Compare with single-channel system, intensive WDM (being designated hereinafter simply as DWDM) has not only greatly improved the message capacity of network system, has made full use of bandwidth of an optical fiber, and it has plurality of advantages such as the flexibility, service transparency of dilatation and Route Selection.The great characteristic and the advantage of wdm system are that it is transparent for the characteristics such as agreement, speed and frame format of business, and rely on the protection switching technique of full light amplification photoreactive layer, can replace function and the effect of SDH to a great extent.Therefore can skip the SDH layer, as shown in Figure 5, utilize GbE directly the Gigabit Ethernet signal to be realized wide-area transmission by wdm system to the method for WDM.This method has been omitted SDH network and equipment, has greatly reduced the networking and the operation cost of network; But directly Gigabit Ethernet being used for wide area WDM transmission, also to exist very big shortcoming as follows:
1, the transmission quality monitoring and the fault location that lack physical layer.Gigabit Ethernet is the technology that is applied to local area network (LAN) at first, therefore, does not formulate corresponding reliability specification at the transmission environment and the demand of wide area network.
2, lack electric regenerator device support.Because the influence of chromatic dispersion and nonlinear effect, WDM signal be through needing electricity regeneration after the transmission of certain distance, at present in the network most electric reclaim equiments all based on the STM sequence rate of SDH.
3, bandwidth availability ratio is low.WDM equipment cost height, wavelength resource are valuable especially.And one road Gigabit Ethernet has only the information rate of 1Gbit/s, compares with every road 2.5Gb/s even the 10Gb/s of backbone network SDH, and resource utilization is lower.
Because the deficiency of existing Gigabit Ethernet signal wide area network tranmission techniques, main purpose of the present invention is to provide a kind of Wavelength division multiplexing optical network transmission adapting method of IP data, it eliminates the use of atm device and SDH equipment, directly realize of the transmission of the Gigabit Ethernet signal of carrying IP data at the WDM wide area network, be IP over WDM, reduce the organizing cost of network and operation, maintenance and management expense greatly.
Another object of the present invention is to provide a kind of Wavelength division multiplexing optical network transmission adapting method of IP data, the characteristic that it transmits network according to the characteristics and the WDM of IP operation, utilize new Data Transport Protocol, enough monitoring of wide area network transmission quality and operation maintenance abilities are provided, avoid too much expense and complicated operations.
Another purpose of the present invention is to provide a kind of Wavelength division multiplexing optical network transmission adapting method of IP data, and it adopts rational statistic multiplexing method, makes a wavelength division multiplexing wavelength can transmit the Gigabit Ethernet signal more than a tunnel, improves bandwidth availability ratio.
A further object of the present invention is to provide a kind of Wavelength division multiplexing optical network transmission adapting method of IP data, it is with good expansibility can, can expand the Gigabit Ethernet port number according to user's request and network actual flow, solve the wide area network transmission problem of a large amount of Gigabit Ethernet FPDP in the present high-speed local area network, realize the effective transmission of IP to wavelength division multiplexed optical network.
The objective of the invention is to realize by the following technical solutions:
A kind of Wavelength division multiplexing optical network transmission adapting method of IP data, the Gigabit Ethernet of carrying IP data is communicated by letter to the Gigabit Ethernet processing module of wavelength division multiplexed optical network transmission adapting appts with IP; IP communicates by letter with wavelength division multiplexed optical network to the Wide Area Network interface processing module of wavelength division multiplexed optical network transmission adapting appts; IP handles the data of Gigabit Ethernet and is transferred to wavelength division multiplexed optical network by the Wide Area Network interface processing module to the core processing module of wavelength division multiplexed optical network transmission adapting appts, and the data of wavelength division multiplexed optical network are carried out reverse process and are transferred to Gigabit Ethernet by the Gigabit Ethernet processing module; IP also is provided with system control module and management and monitoring module to wavelength division multiplexed optical network transmission adapting appts.
The Gigabit Ethernet processing module generates, sends, receives and handles the Gigabit Ethernet data, and it comprises at least: opto-electronic conversion, serial parallel conversion, 8 bit data to encoding and decoding, link synchronization, the transmission accepting state machine of 10 bit data, send the function that receives buffer memory and control.
The Gigabit Ethernet interface of described Gigabit Ethernet processing module meets IEEE 802.3z standard.
Gigabit Ethernet processing module recited above is one or more.
Core processing module is handled the data of Gigabit Ethernet and is comprised by the operating procedure that the Wide Area Network interface processing module is transferred to wide area network:
1, receives the data that send by the Gigabit Ethernet processing module, and these data are carried out buffer memory, multiplexing;
2, produce checking data;
3, organize Frame;
4, data scrambling;
5, data are carried out send to the Wide Area Network interface processing module after the width coupling.
Core processing module also will produce and insert empty frame according to the link needs after the step that produces checking data.
This multiplexing mode is a multiple signals statistic multiplexing mode, and its multiplexing step comprises:
1, judging whether current data frame sends finishes; Do not send if send then continue;
If 2 have sent and finish, read the priority control word;
3, whether the First Input First Output of judging all medium access control passages has full; If no, then change step 5 over to;
If 4 have, it is the highest then to send priority, and the Frame in the full medium access control passage of the First Input First Output of medium access control passage, changes step 1 over to;
5, judge in all medium access control passages whether complete bag is arranged,, change step 7 over to if do not have;
If 6 have, it is the highest then to send priority, and has the Frame in the medium access control passage of complete packet in the medium access control passage; Change step 1 over to;
If do not have complete bag in the minimum medium access control passage of 7 priority, change step 1 over to after inserting empty bag.
Core processing module is handled the data of wide area network and is comprised by the operating procedure that the Gigabit Ethernet processing module is transferred to Gigabit Ethernet:
1, receives the data that send by the Wide Area Network interface processing module;
2, data sync;
3, data check error correction;
4, disassemble Frame;
5, data width coupling;
6, data de-scrambling;
7, metadata cache and demultiplexing;
8, send to the Gigabit Ethernet processing module.
The function of Wide Area Network interface processing module comprises: finish the Wide Area Network interface Signal Processing, electric light/photoelectricity processing, Clock Extraction, the Frame byte of realization Wide Area Network interface signal detects and goes here and there also/the parallel serial conversion operation.
The Wide Area Network interface signal is the signal that is not less than 1Gb/s.
System control module executive system software program is finished initial configuration, status poll and abnormality alarming to each hardware module chip, and communicates by letter with monitoring host computer by data communication interface.
Management utilizes Frame to provide network management information to realize comprising at least the operation maintenance management operation of transmission quality monitoring with monitoring module.
Described Frame is observed the data light net adapting protocol that is proposed, and this Frame comprises at least: locator data, Length Indication data, categorical data, address and multiplexed information, frame head checking data, real data section, frame check data.
The Wavelength division multiplexing optical network transmission adapting method of IP data of the present invention has following characteristics:
1, need not by ATM, SDH network and high-performance router equipment, adopt IP directly to realize of the reliable transmission of Gigabit Ethernet signal at wide area network to wavelength division multiplexed optical network transmission adapting appts, simplified network layer, greatly reduce network construction cost, had very strong application flexibility.
2, carry out data-optimizedly specially towards the IP/ Gigabit Ethernet, overcome the too loaded down with trivial details defective of ATM and SDH, equipment cost is low, and the cost performance height is highly suitable for the application of data light network.
3, utilize novel wide area network transmission adapting protocol-data light net adapting protocol (Data OpticalNetwork Adapt, be designated hereinafter simply as DONA), overcome the defective that lacks network management and physical layer transmission quality monitoring function in wide area when the Gigabit Ethernet signal transmits, equipment dependability and fault-resistant ability are improved.
4, adopt the method for multichannel Gigabit Ethernet signal multiplexing, make a WDM wavelength can transmit the Gigabit Ethernet data more than a tunnel simultaneously, improved the wide area network bandwidth utilization greatly.
5, pass through the equipment management system that is equipped with, realized the function of performance management, configuration management, alarm management and safety management.
6, adopting the statistic multiplexing mode, is unit with the bag, need not to carry out adress analysis, and it is according to each road flow size dynamic bandwidth allocation, and forwarding speed is fast, meets the data network business characteristic.
The present invention is described in further detail below in conjunction with accompanying drawing and specific embodiment:
Fig. 1 is the development trend schematic diagram of data and speech business.
Fig. 2 is the networking schematic diagram of router retransmission method.
Fig. 3 is the networking schematic diagram of GbE to the SDH method.
Fig. 4 is the protocol hierarchy schematic diagram of GbE to the SDH method.
Fig. 5 is the networking schematic diagram of GbE to the WDM method.
Fig. 6 uses schematic diagram for gigabit of the present invention than transmission adaptor.
Fig. 7 is a general function block diagram of the present invention.
Fig. 8 is data frame structure definition schematic diagram of the present invention.
Fig. 9 is a Gigabit Ethernet processing module schematic diagram of the present invention.
Figure 10 is a core processing module schematic diagram of the present invention.
Figure 11 is a Wide Area Network interface processing module schematic diagram of the present invention.
Figure 12 is management of the present invention and monitoring module schematic diagram.
Figure 13 is the multiple signals statistic multiplexing flow chart of one embodiment of the invention.
Shown in Fig. 6,7, Gigabit Ethernet of the present invention is communicated by letter to the Gigabit Ethernet processing module of wavelength division multiplexed optical network transmission adapting appts with IP; IP is to the Wide Area Network interface processing module and the WDM wan communication of wavelength division multiplexed optical network transmission adapting appts; IP handles the data of Gigabit Ethernet and is transferred to the WDM wide area network by the Wide Area Network interface processing module to the core processing module of wavelength division multiplexed optical network transmission adapting appts, and the data of wide area network are handled and is transferred to Gigabit Ethernet by the Gigabit Ethernet processing module; IP also is provided with system control module and management and monitoring module to wavelength division multiplexed optical network transmission adapting appts.
As shown in Figure 9, the Gigabit Ethernet processing module generates, sends, receives and handles the Gigabit Ethernet data, and it comprises at least: opto-electronic conversion, serial parallel conversion, 8 bit data to encoding and decoding, link synchronization, the transmission accepting state machine of 10 bit data, send the function that receives buffer memory and control.
The Gigabit Ethernet interface of Gigabit Ethernet processing module recited above meets the IEEE802.3z standard; And this Gigabit Ethernet processing module is one or more.
As shown in figure 10, core processing module is handled the data of Gigabit Ethernet and is comprised by the operating procedure that the Wide Area Network interface processing module is transferred to wide area network:
1, receives the data that send by the Gigabit Ethernet processing module, multiplexing, these data of buffer memory;
2, produce checking data;
3, organize Frame;
4, data scrambling;
5, data are carried out send to the Wide Area Network interface processing module after the width coupling.
Core processing module also will produce and insert empty frame according to the link needs after organizing the step of Frame.
As shown in figure 13, multiplex mode recited above is a multiple signals statistic multiplexing mode, and its multiplexing step comprises:
1, judging whether current data frame sends finishes; Do not send if send then continue;
If 2 have sent and finish, read the priority control word;
3, whether the First Input First Output of judging all medium access control passages has full; If no, then change step 5 over to;
If 4 have, it is the highest then to send priority, and the Frame in the full medium access control passage of the First Input First Output of medium access control passage, changes step 1 over to;
5, judge in all medium access control passages whether complete bag is arranged,, change step 7 over to if do not have;
If 6 have, it is the highest then to send priority, and has the Frame in the medium access control passage of complete packet in the medium access control passage; Change step 1 over to;
If do not have complete bag in the minimum medium access control passage of 7 priority, change step 1 over to after inserting empty bag.
As shown in figure 10, core processing module is handled the data of wide area network and is comprised by the operating procedure that the Gigabit Ethernet processing module is transferred to Gigabit Ethernet:
1, receives the data that send by the Wide Area Network interface processing module;
2, data sync;
3, data check error correction;
4, disassemble Frame;
5, data width coupling;
6, data de-scrambling;
7, metadata cache and demultiplexing;
8, send to the Gigabit Ethernet processing module.
As shown in figure 11, the function of Wide Area Network interface processing module comprises: finish the Wide Area Network interface Signal Processing, realize that electric light/photoelectricity processing, Clock Extraction, the Frame byte of Wide Area Network interface signal detects and go here and there also/parallel serial conversion.
Wide Area Network interface signal recited above is the 2.488Gb/s signal.
As shown in figure 12, system control module executive system software program is finished initial configuration, status poll and abnormality alarming to each hardware module, and communicates by letter with monitoring host computer by data communication interface; Management utilizes Frame to provide network management information to realize comprising at least the operation maintenance management operation of transmission quality monitoring with monitoring module.
As shown in Figure 8, Frame is observed new new types of data light net adapting protocol that propose, corresponding, and this Frame comprises at least: locator data, Length Indication data, categorical data, address and multiplexed information, data frame head checking data, real data section, frame check data.
As Fig. 9, Figure 10, Figure 11 and shown in Figure 12, be provided with one or more Gigabit Ethernet processing module, core processing module, 2.488Gbit/s Wide Area Network interface processing module, system control module and management and monitoring module in one embodiment of the invention.Wherein the function of each module is as follows:
1, Gigabit Ethernet processing module, the Gigabit Ethernet interface of transmission adaptor meets the IEEE802.3z standard.It is finished, and optical interface is handled, also/also operation of four functional units such as string conversion, 8B/10B encoding and decoding, medium access control processing module of string.Realize generation, transmission and reception, the processing of Gigabit Ethernet Frame.
2, core processing module, this module are finished the core processing operation of whole system, its rely on hardware handles finish to data multiplexing/demultiplexing, metadata cache with adaptive, Frame is handled, system resource control with arbitrate.
3, Wide Area Network interface processing module, this module are finished 2.488Gb/s Wide Area Network interface Signal Processing, the electric light/photoelectricity processing, Clock Extraction, string that realizes the 2.488Gb/s signal also/operations such as parallel serial conversion.
4, system control module, the hardware of this module is made up of CPU and memory thereof.Its executive system software program is finished initial configuration, status poll and abnormality alarming to each hardware module chip, and communicates by letter with the Control Software on the monitoring host computer by serial line interface.
5, management and monitoring module, this module utilize that Frame provides abundant and flexibly the webmaster expense realize necessary operation maintenance management operation; Wherein the most key is the transmission quality monitoring.Therefore the not corresponding definition of Gigabit Ethernet interface has only the wide area network coffret to possess these functions.Frame provides the webmaster frame specially, so that the equipment in downstream can be notified link transmission quality and fault message the equipment of its upstream in real time.
As shown in Figure 8, Frame recited above meets new data light net adapting protocol (the Data Optical Network Adapt that is proposed, be designated hereinafter simply as DONA), this Frame comprises at least: locator data, Length Indication data, categorical data, address and multiplexed information, data frame head checking data, real data section, frame check data.SDH and Gigabit Ethernet do not design for optical internet, therefore exist such-and-such drawback, therefore, utilize the data frame structure meet the DONA agreement, in wide area network, can break away from directly transmission of IP data in wavelength division multiplexed network of transmission standard such as SDH.
Wherein, in the data frame structure of present embodiment, comprise:
1) location byte: comprise the special identifier byte, be used to discern the original position of every frame;
2) Length Indication: the length of representing whole Frame;
3) type indication: illustrate that this frame is business data frame or network management data frame or empty frame, and the protocol type of business datum etc.;
4) address and multiplexed information: be used as the sign of different Gigabit Ethernet ports in than transmission adaptor in gigabit, also can expand to tag field in the future;
5) frame head CRC: frame head CRC carrying is carried out the value that CRC16 calculates to length, address and type indication.The recipient can test to the information of frame head with it, and its multinomial is:
x
16+x
12+x
5+1
6) payload user data: which kind of type bearer service data or network management information data are specially by type demonstrative definition in the frame head;
7) frame check: system carries out CRC32 to entire frame to be calculated and the result is placed in the frame check expense, and receiver side can carry out the check of frame data successively.Its multinomial is:
x
32+x
26+x
23+x
22+x
16+x
12+x
11+x
10+x
8+x
7+x
5+x
4+x
2+x+1
Above Frame has the following advantages:
1, optimize towards IP, simple to operate
DONA is elongated Frame, and its form and IP datagram and ethernet frame are similar.Therefore transmission adaptor carries out the encapsulation/decapsulation of Gigabit Ethernet packet, need not to carry out the branch frame and the reorganization of data, as long as simply add/peel off several overhead bytes at the header and the telegram end of each datagram.Therefore the operation of equipment complexity is low, the reliability height;
2, bandwidth availability ratio height
The DONA agreement is only required in the beginning of the elongated packet in upper strata and afterbody and is added several overhead bytes, the bandwidth loss of having avoided digital coding and SAR operation to bring, and bandwidth availability ratio is very high;
3, the webmaster expense is flexible and efficient
Gigabit Ethernet is a kind of local area network technology originally, and a great weakness of transmitting in wide area network is to lack webmaster and transmission quality monitoring capacity; Though and SDH has abundant expense and powerful Network Management Function, these functions are at the traditional voice network design, and are also not exclusively necessary in data network; Along with the development of wavelength division multiplexed network, WDM layer also will have the management and the monitoring function of physical layer, exist function overlapping with SDH.Therefore in the design of DONA frame, must consider wide area network transmission environment and demand, and the function of wavelength division multiplexing physical layer, provide abundant and appropriate management and monitoring function, can realize the transmission of operation maintenance management information between the quick location, node device of physical layer fault.
In the DONA frame structure, the frame type indication is set, be the network management information that traffic frame or system use in order to identify this frame.This is a kind of message-oriented webmaster expense, is provided with a great difference with the bit-oriented webmaster expense of SDH.The major advantage of this mode is to use flexibly, occupied bandwidth is few, extensibility is strong.Equipment is worn wide in inborn ability whenever necessary, both avoided unnecessary bandwidth waste, and having guaranteed again has enough system resource and bandwidth to be used for network management when needed, and can increase new network management function according to the network demand of continuous variation.
Defined following a few class network management information frames in the present embodiment:
Defective indication frame: corresponding the most key and urgent directive command, switch as protection etc.Need the highest processing grade and the fastest processing speed, the recipient analyzes and carries out corresponding operation by hardware to data.
Configuring negotiation and performance indication frame: finish active configuration information, the timed sending of transmitting separately and receive operations such as transmission performance parameter such as crc error bag and packet loss to both sides, so that the other side's awareness network circuit transmission quality, for operations such as routing provide information.
Network management data path:, be used for the data communication between equipment and the webmaster as control access independently.
As shown in figure 13, multiplex mode of the present invention is a multiple signals statistic multiplexing mode; Because transmission adaptor can insert multichannel Gigabit Ethernet signal simultaneously, therefore exist the multiplexing of multiple signals and demultiplexing problem.Transmission adaptor provides point-to-point connection, after Wide Area Network interface receives data, to distinguish packet and should go to which Gigabit Ethernet port.
Because what transmit on Gigabit Ethernet link and wide area network 2.5Gb/s link all is packet, therefore, time-multiplexed method is very irrational, and adopts the mode of statistic multiplexing, then can rely on label to go to realize the demultiplexing function according to the different port distributing labels.
Statistic multiplexing mode recited above has following advantage:
Realize simple relatively: what the Gigabit Ethernet port of adapter and wide area network 2.5Gb/s port transmitted all is packet, uses Multiplexing Technology the most reasonable, and hardware is realized simple relatively.
Need not addressing operation: router device need be analyzed the address of each packet, and searches address table, could find suitable next hop address and port for data.IP gives local area network (LAN) layer-3 switch and wide area network high-performance switch router to wavelength division multiplexed optical network transmission adapting appts with addressing function, do not need the ethernet address or the IP address of each packet are analyzed and addressing, greatly simplified facility load and cost.
Allocated bandwidth is flexible: data traffic has sudden, and bit rate adopts the timeslot multiplex mode in continuous variation in traditional TDM technology, fix for the bandwidth that each tributary signal distributes, and can bring very big bandwidth waste.After adopting the multiplex mode in the transmission adaptor, the bandwidth that every road signal occupies is dynamic change, can adjust in real time according to factors such as each port flow and priority, has improved the conveying function of utilization of network bandwidth and business datum.
Improve bandwidth availability ratio: because data service is sudden, the prompting message amount of each Gigabit Ethernet link is in continuous variation, if use time-division multiplex technology, each ethernet port information must occupy fixing bandwidth in the 2.5Gb/s link, in the ethernet port data traffic hour, must cause the waste of bandwidth.Use Multiplexing Technology, the bandwidth that can distribute the 2.5Gb/s link according to flow flexibly makes full use of valuable wide area network bandwidth resources to greatest extent.Just be based on these characteristics, adapter can provide multiplexed above two-way.
The information rate of one road Gigabit Ethernet signal is 1Gbit/s, and the line speed of Wide Area Network interface is 2.488Git/s, even consider the frame overhead of DONA agreement, behind the carrying two-way GbE, wide area network still has the part remaining bandwidth.In order to save valuable wide area network bandwidth resources, consider the sudden of data service, and adapter can distribute bandwidth flexibly by statistic multiplexing, can allow a transmission adaptor carrying to surpass 2 tunnel GbE signal.
Under normal condition, the circuit utilization rate of GbE can not surpass 80%.If insert 3 road signals, every road utilance all is 80% calculating, and total information rate is 1G * 80% * 3=2.4G.It is simple that the DONA agreement has expense, and the characteristics that efficiency of transmission is high can be carried such business information speed.If but 3 road ethernet signals reach simultaneously or near maximum information speed, total bandwidth has just surpassed 2.488G, if there are not corresponding treatment measures, just may cause that the transmission adaptor buffer memory overflows, formation is congested, packet loss will sharply rise.Therefore, at first take the flow control of ethernet port, implement flow control, reduce the flow on every road at the ethernet port of transmission adaptor; Stipulating the priority of corresponding service then, is the different different priority of port definition in advance, to guarantee the performance of high priority port traffic.
Therefore, present embodiment is an example with three road signals, and the step of its statistic multiplexing is as follows:
1, judging whether current data frame sends finishes; Do not send if send then continue;
If 2 have sent and finish, read the priority control word;
3, whether the First Input First Output of judging three medium access control passages has full; If no, then change step 9 over to;
4, judge whether the First Input First Output of the medium access control passage that priority is the highest is full, if less than, change step 6 over to;
5, the Frame in the medium access control passage that transmission priority is the highest changes step 1 over to;
6, judge whether the First Input First Output that is left two-way medium access control passage is all full; If not, change step 8 over to;
7, the Frame in the medium access control passage that transmission priority is high changes step 1 over to;
8, the Frame in the medium access control passage that the First Input First Output of transmission two-way medium access control passage is full changes step 1 over to;
9, judge the complete bag that whether has in the highest medium access control passage of priority,, then send the Frame in this medium access control passage if having; Change step 1 over to;
10, judge the complete bag that whether has in time high medium access control passage of priority,, then send the Frame in this medium access control passage if having; Change step 1 over to;
11, judge the complete bag that whether has in the minimum medium access control passage of priority,, then send the Frame in this medium access control passage if having; Change step 1 over to;
12, change step 1 over to behind the empty bag of insertion.
Utilize above-mentioned DONA frame, the system control module of present embodiment is finished initial configuration, status poll and abnormality alarming to each hardware module chip according to corresponding flow process, communicates by letter with monitoring host computer by serial line interface; And the webmaster expense of utilizing the DONA frame to provide with monitoring module is provided realizes corresponding operation maintenance management operation, monitor comprising transmission quality.The webmaster frame that utilizes the DONA frame to provide specially makes upstream device link transmission quality and fault can in time be notified in real time the equipment of its upstream.
Claims (13)
1, a kind of Wavelength division multiplexing optical network transmission adapting method of IP data, the Gigabit Ethernet of carrying IP data is communicated by letter to the Gigabit Ethernet processing module of wavelength division multiplexed optical network transmission adapting appts with IP; IP communicates by letter with wavelength division multiplexed optical network to the Wide Area Network interface processing module of wavelength division multiplexed optical network transmission adapting appts; IP handles the data of Gigabit Ethernet and is transferred to wavelength division multiplexed optical network by the Wide Area Network interface processing module to the core processing module of wavelength division multiplexed optical network transmission adapting appts, and the data of wavelength division multiplexed optical network are carried out reverse process and are transferred to Gigabit Ethernet by the Gigabit Ethernet processing module; IP also is provided with system control module and management and monitoring module to wavelength division multiplexed optical network transmission adapting appts.
2, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1, it is characterized in that: the Gigabit Ethernet processing module generates, sends, receives and handles the Gigabit Ethernet data, and it comprises at least: opto-electronic conversion, serial parallel conversion, 8 bit data to encoding and decoding, link synchronization, the transmission accepting state machine of 10 bit data, send the function that receives buffer memory and control.
3, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1 or 2 is characterized in that: the Gigabit Ethernet interface of described Gigabit Ethernet processing module meets the IEEE802.3z standard.
4, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1 or 2 is characterized in that: the Gigabit Ethernet processing module is one or more.
5, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1 is characterized in that: core processing module is handled the data of Gigabit Ethernet and is comprised by the operating procedure that the Wide Area Network interface processing module is transferred to wide area network:
A, receive the data that send by the Gigabit Ethernet processing module, and these data are carried out buffer memory, multiplexing;
B, generation checking data;
C, organize Frame;
D, data scrambling;
E, data are carried out sending to the Wide Area Network interface processing module after the width coupling.
6, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 5 is characterized in that: core processing module also will produce and insert empty frame according to the link needs after the step that produces checking data.
7, as the Wavelength division multiplexing optical network transmission adapting method of claim 1 or 5 described IP data, it is characterized in that: this multiplexing mode is a multiple signals statistic multiplexing mode, and its multiplexing step comprises:
A, judge whether current data frame sends and finish; Do not send if send then continue;
Finish if b has sent, read the priority control word;
C, judge whether the First Input First Output of all medium access control passages has full; If no, then change step e over to;
If d has, it is the highest then to send priority, and the Frame in the full medium access control passage of the First Input First Output of medium access control passage, changes step a over to;
E, judge in all medium access control passages whether complete bag is arranged,, change step g over to if do not have;
If f has, it is the highest then to send priority, and has the Frame in the medium access control passage of complete packet in the medium access control passage; Change step a over to;
If do not have complete bag in the minimum medium access control passage of g priority, change step a over to after inserting empty bag.
8, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1 is characterized in that: core processing module is handled the data of wide area network and is comprised by the operating procedure that the Gigabit Ethernet processing module is transferred to Gigabit Ethernet:
The data that a, reception are sent by the Wide Area Network interface processing module;
B, data sync;
C, data check error correction;
D, disassemble Frame;
E, data width coupling;
F, data de-scrambling;
G, metadata cache and demultiplexing;
H, send to the Gigabit Ethernet processing module.
9, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1, it is characterized in that: the function of Wide Area Network interface processing module comprises: finish the Wide Area Network interface Signal Processing, electric light/photoelectricity processing, Clock Extraction, the Frame byte of realization Wide Area Network interface signal detects and goes here and there also/the parallel serial conversion operation.
10, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 9 is characterized in that: the Wide Area Network interface signal is the signal that is not less than 1Gb/s.
11, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1, it is characterized in that: system control module executive system software program, finish initial configuration, status poll and abnormality alarming, and communicate by letter with monitoring host computer by data communication interface to each hardware module chip.
12, the Wavelength division multiplexing optical network transmission adapting method of IP data as claimed in claim 1 is characterized in that: management utilizes Frame to provide network management information to realize comprising at least the operation maintenance management operation of transmission quality monitoring with monitoring module.
13, as claim 1 or 5 or 6 or 8 or the Wavelength division multiplexing optical network transmission adapting method of 9 or 12 described IP data, it is characterized in that: described Frame is observed the data light net adapting protocol that is proposed, and this Frame comprises at least: locator data, Length Indication data, categorical data, address and multiplexed information, frame head checking data, real data section, frame check data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011188197A CN1227842C (en) | 2001-06-15 | 2001-06-15 | Wavelength division multiplexing optical network transmission adapting method for IP data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011188197A CN1227842C (en) | 2001-06-15 | 2001-06-15 | Wavelength division multiplexing optical network transmission adapting method for IP data |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1392684A true CN1392684A (en) | 2003-01-22 |
| CN1227842C CN1227842C (en) | 2005-11-16 |
Family
ID=4663451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011188197A Expired - Fee Related CN1227842C (en) | 2001-06-15 | 2001-06-15 | Wavelength division multiplexing optical network transmission adapting method for IP data |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1227842C (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006021157A1 (en) * | 2004-08-26 | 2006-03-02 | Huawei Technologies Co., Ltd. | A method and a equipment of realizing transparent transmission of low speed signals in optical transmission |
| WO2006094461A1 (en) * | 2005-03-09 | 2006-09-14 | Huawei Technologies Co., Ltd. | A transmission method for ethernet service signal in wavelength division multiplexing network |
| CN100361473C (en) * | 2004-05-14 | 2008-01-09 | 迈普（四川）通信技术有限公司 | Interconnection method between frame relay and Ethernet |
| CN100382521C (en) * | 2003-03-27 | 2008-04-16 | 华为技术有限公司 | Method of supporting multi kilomega ethernet terminal photoelectric multiplex |
| CN100466673C (en) * | 2003-08-06 | 2009-03-04 | 华为技术有限公司 | Method for realizing official telephone of SDH device using IP telephone |
| WO2009065326A1 (en) * | 2007-11-22 | 2009-05-28 | Zte Corporation | A bit mapping method of high-order modulation |
| US7848653B2 (en) | 2004-12-14 | 2010-12-07 | Huawei Technologies Co., Ltd. | Method and device for transmitting low rate signals over an optical transport network |
| CN1817002B (en) * | 2003-07-01 | 2011-12-14 | 爱立信股份有限公司 | Improvements in or relating to communication systems |
| CN101150376B (en) * | 2007-10-25 | 2012-05-23 | 中兴通讯股份有限公司 | Signal speed adjustment device |
| CN102769605A (en) * | 2011-05-05 | 2012-11-07 | 中国移动通信集团设计院有限公司 | Method and apparatus for determining relay circuit |
| CN101141347B (en) * | 2007-05-24 | 2012-12-19 | 中兴通讯股份有限公司 | Multi-path ethernet signal gathering apparatus and method |
| CN101795200B (en) * | 2010-01-28 | 2015-05-20 | 中国电子科技集团公司第五十四研究所 | Multi-rate POS interface adaptive transmission method |
| CN112385187A (en) * | 2018-05-14 | 2021-02-19 | 诺基亚技术有限公司 | Method, system and apparatus for new radio bandwidth part operation |
| CN114389753A (en) * | 2021-12-15 | 2022-04-22 | 中国电子科技集团公司第三十研究所 | POS interface capable of adapting to multiple rates |
-
2001
- 2001-06-15 CN CNB011188197A patent/CN1227842C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382521C (en) * | 2003-03-27 | 2008-04-16 | 华为技术有限公司 | Method of supporting multi kilomega ethernet terminal photoelectric multiplex |
| CN1817002B (en) * | 2003-07-01 | 2011-12-14 | 爱立信股份有限公司 | Improvements in or relating to communication systems |
| CN100466673C (en) * | 2003-08-06 | 2009-03-04 | 华为技术有限公司 | Method for realizing official telephone of SDH device using IP telephone |
| CN100361473C (en) * | 2004-05-14 | 2008-01-09 | 迈普（四川）通信技术有限公司 | Interconnection method between frame relay and Ethernet |
| WO2006021157A1 (en) * | 2004-08-26 | 2006-03-02 | Huawei Technologies Co., Ltd. | A method and a equipment of realizing transparent transmission of low speed signals in optical transmission |
| US7848653B2 (en) | 2004-12-14 | 2010-12-07 | Huawei Technologies Co., Ltd. | Method and device for transmitting low rate signals over an optical transport network |
| CN100442761C (en) * | 2005-03-09 | 2008-12-10 | 华为技术有限公司 | Transmission method and process device of Ethernet service signal in wave division duplex network |
| WO2006094461A1 (en) * | 2005-03-09 | 2006-09-14 | Huawei Technologies Co., Ltd. | A transmission method for ethernet service signal in wavelength division multiplexing network |
| CN101141347B (en) * | 2007-05-24 | 2012-12-19 | 中兴通讯股份有限公司 | Multi-path ethernet signal gathering apparatus and method |
| CN101150376B (en) * | 2007-10-25 | 2012-05-23 | 中兴通讯股份有限公司 | Signal speed adjustment device |
| WO2009065326A1 (en) * | 2007-11-22 | 2009-05-28 | Zte Corporation | A bit mapping method of high-order modulation |
| CN101795200B (en) * | 2010-01-28 | 2015-05-20 | 中国电子科技集团公司第五十四研究所 | Multi-rate POS interface adaptive transmission method |
| CN102769605A (en) * | 2011-05-05 | 2012-11-07 | 中国移动通信集团设计院有限公司 | Method and apparatus for determining relay circuit |
| CN112385187A (en) * | 2018-05-14 | 2021-02-19 | 诺基亚技术有限公司 | Method, system and apparatus for new radio bandwidth part operation |
| CN114389753A (en) * | 2021-12-15 | 2022-04-22 | 中国电子科技集团公司第三十研究所 | POS interface capable of adapting to multiple rates |
| CN114389753B (en) * | 2021-12-15 | 2024-01-30 | 中国电子科技集团公司第三十研究所 | POS interface capable of adapting to various rates |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1227842C (en) | 2005-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1252960C (en) | Method of transmitting data in communicating system | |
| CN1227842C (en) | Wavelength division multiplexing optical network transmission adapting method for IP data | |
| CN1976537A (en) | Transmission apparatus | |
| EP3327957B1 (en) | Signal transmission processing method and apparatus and distributed base station | |
| US7266296B2 (en) | Architecture and method for framing control and data bursts over 10 Gbit Ethernet with and without WAN interface sublayer support | |
| CN1601950A (en) | Method and system to recover resources in the event of data burst loss within wdm-based optical-switched networks | |
| CN1362813A (en) | General-purpose group frame, program frame transmission apparatus and method | |
| CN1525679A (en) | Method and system to frame and format optical control and data bursts in wdm-based photonic burst switched networks | |
| CN1890943A (en) | Method and architecture for optical networking between server and storage area networks | |
| CN1946007A (en) | Device and its method for mixing and converging data service and SDH service | |
| CN1859369A (en) | Method and device for realizing network connection service establishment | |
| CN1525671A (en) | Alarm transfer method and wide area ethernet network | |
| US20080037581A1 (en) | Transmission apparatus | |
| CN1806466A (en) | Architecture, method and system of multiple high-speed servers for WDM based photonic burst-switched networks | |
| CA2550618A1 (en) | Method, apparatus and system for optical communications | |
| CN1642087A (en) | System and method for performing transmission and reception operations based on broadcast/communication convergence | |
| CN1661941A (en) | Distributed base stations and data interactive method | |
| CN1543162A (en) | Method for hybrid transmission of variable-length data packet and fixed length cell, and adaptation device | |
| CN1747606A (en) | Service data transmission and apparatus thereof | |
| CN1753383A (en) | Multi-service transport apparatus for integrated transport networks | |
| US20010021171A1 (en) | Transmission unit and two-way signal conversion method | |
| US8306066B2 (en) | Transmission device | |
| US8867538B2 (en) | Ethernet media converter supporting high-speed wireless access | |
| CN101030844A (en) | Fiber-optic channel service duplexer, data transmitting system and method | |
| CN101420414B (en) | Method for differentiating multiple services in Gbit passive optical network system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051116 Termination date: 20130615 |