CN100414939C - Conversion circuit and method between ATM data and data in frame format, and transmission exchange system - Google Patents
Conversion circuit and method between ATM data and data in frame format, and transmission exchange system Download PDFInfo
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- CN100414939C CN100414939C CNB2004100707979A CN200410070797A CN100414939C CN 100414939 C CN100414939 C CN 100414939C CN B2004100707979 A CNB2004100707979 A CN B2004100707979A CN 200410070797 A CN200410070797 A CN 200410070797A CN 100414939 C CN100414939 C CN 100414939C
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Abstract
The present invention provides a circuit which converts ATM data into an AOP frame, and a circuit which converts an AOP frame into ATM data, wherein the AOP frame is packaged with the ATM data. The circuit which converts ATM data into an AOP frame comprises an ATM cell receiving module, an uplink receiving FIFO, an uplink framing module, an uplink lookup table memory, an uplink transmitting FIFO and a frame transmitting interface module. The circuit which converts an AOP frame into ATM data comprises a frame receiving interface module, a downlink receiving FIFO, a downlink frame splitting module, a downlink transmitting FIFO and an ATM cell transmitting module. Correspondingly, the present invention also provides a converting method based on the ATM cell and the frame format of a converting circuit, and a transmission switching system and a transmission switching method which are based on the converting circuit. By using the present invention, the ATM and the AOP can conveniently carry out format conversion, the transmission switching system adopts ATM to be communicated with the outer part, and the inner part of the transmission switching system adopts the AOP frame to be transmitted.
Description
Technical field
The present invention relates to transmission and switching technology field, be meant circuit, conversion method and the transmission switching system and the transmission switching method of a kind of ATM data and frame format conversion especially.
Background technology
Along with the transmission speed of high-speed differential signal is more and more higher, the high-speed high capacity backboard adopts point-to-point high speed serialization line design mostly now, and abandoned parallel bus in the past, the data format that backboard transmission is simultaneously adopted also is frame format mostly, but in the system of reality, ATM(Asynchronous Transfer Mode) is used widely, in this case, needs solution that ATM cell is packaged into the problem that frame format is transmitted.Show the structure of ATM cell as Fig. 1, wherein ATM cell uses VPI (VPI) to identify being connected of a foundation with VCI (VCI), and wherein whether head error detection occurs (HEC) territory is to be used for checking this ATM cell header information correct.
The existing technology that ATM cell is encapsulated framing can transmit the standard of ATM (FATE, Frame-based ATM Transport over Ethernet) based on ethernet frame with reference to what atm forum was formulated, and list of references is AF-FBATM-0139.001.Fig. 2 shows the relation between described FATE and other agreements, as can be seen from the figure, only defined AAL5 in the user data that FATE carried, be the cell of ATM Adaptation Layer 5, for how carrying the not definition of AAL1, AAL2, AAL3/4 cell, Q.2931 FATE also needs complicated control and the management agreement of a cover in addition, as ILMI,, Q.2100 etc., to implement difficulty bigger for FATE.
Summary of the invention
In view of this, first purpose of the present invention is to provide a kind of ATM data to be converted to the circuit and the conversion method of the conversion of AOP frame format, makes the ATM formatted data can be converted to the AOP frame format easily.
Second purpose of the present invention provided circuit and the conversion method that a kind of AOP frame format is converted to the ATM data, makes the AOP frame format can be converted to the ATM formatted data easily.
The 3rd purpose of the present invention provided a kind of transmission switching system and transmission switching method of the circuit based on the conversion of ATM data and frame format, make transmission switching system and the outside ATM of employing communication, and inside can adopt the AOP frame to transmit.
ATM data provided by the invention are converted to the circuit of AOP frame, and described AOP frame is the frame that is packaged with the ATM data; It is characterized in that, comprising: ATM cell receiver module, up reception FIFO, up framing module, up lookup table memories, up transmission FIFO, frame transmission interface module; Wherein,
The ATM cell receiver module is used for receiving interface from the ATM side joint and receives ATM cell, and removes the head error detection occurs HEC territory of header, is written among the up reception FIFO as non-standard ATM cell and carries out buffer memory;
The VPI VPI of the address of up lookup table memories and the ATM cell of reception and VCI VCI value exist mapping relations, are used to store the destination interface sign that desire sends cell;
Up transmission FIFO internal separation is a plurality of formations, and a desire in the corresponding up lookup table memories of each formation sends the destination interface sign of cell, is used for non-standard ATM cell that buffer memory sends over as AOP frame payload;
Up framing module is used for regularly reading non-standard ATM cell from up reception FIFO, and from up lookup table memories, find the destination interface sign that described cell desire sends according to the VPI of header and VCI, according to described destination interface sign described cell is written in the up transmission FIFO corresponding queues as AOP frame payload buffer memory; And, be used for before the payload of the AOP frame of up transmission FIFO individual queue, adding the frame head information sets and dress up complete AOP frame, described frame head information comprises cell number amount CN, and the payload of described AOP frame comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number;
Frame transmission interface module is used for reading the AOP frame and sending to outside frame interface from up transmission FIFO.
Wherein, described up framing module comprises: CN memory, Seq memory, scheduler module; Wherein,
The CN memory is used to store the quantity CN of the non-standard ATM cell that each formation of up transmission FIFO stored, as the partial information of frame head;
The Seq memory is used to store the sequence number Seq that each formation of up transmission FIFO sends the AOP frame, as the partial information of frame head;
Scheduler module is used for the up reception FIFO of outside, up lookup table memories, up transmission FIFO are managed and call; And CN memory, the Seq memory of up framing inside modules managed and call, finish framing work.
Wherein, described up framing module further comprises the time delay administration module, and the time delay when being used for each formation framing to up transmission FIFO manages, and is managed by up framing module and calls.
Wherein, up framing module further comprises: store the memory module of certain frame structure information that is used to encapsulate the AOP frame, called by scheduler module when being used for framing.
Corresponding the present invention also provides a kind of ATM data to be converted to the method for AOP frame, it is characterized in that, the formation that different VPI is corresponding different with VCI also comprises step:
At first, the ATM cell that receives is removed header HEC territory and carry out buffer memory as non-standard ATM cell; Then, read non-standard ATM cell, and write in the corresponding queues as frame payload buffer memory according to the VPI and the VCI of cell; Add the frame head information sets then and dress up complete AOP frame before the frame payload of this formation, send, described frame head information comprises cell number amount CN, and described frame payload comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number.
Wherein, described frame head information further comprises: sequence number Seq; Described frame payload comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number.Wherein, described frame head information further comprises: as the reservation territory Res that fills.
Wherein, described frame head information further comprises: certain the frame frame head information that is used to encapsulate the AOP frame.Described certain frame is an ether Ethernet frame, and the frame head information that is used to encapsulate the Ether frame structure of AOP frame accordingly comprises mac address information.
The present invention also provides a kind of AOP frame to be converted to the circuit of ATM data, it is characterized in that, comprising: frame receiving interface module, descending reception FIFO, descending frame module, descending transmission FIFO, the ATM cell sending module torn open; Wherein,
Frame receiving interface module is used for from the frame interface reception AOP frame of outside and sends to descending reception FIFO carrying out buffer memory, the frame head information of described AOP frame comprises cell number amount CN, and the payload of described AOP frame comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number;
Descendingly tear the AOP frame that frame module is used for reading from descending reception FIFO buffer memory open, and the non-standard ATM cell that the payload of AOP frame comprises split out write descending transmission FIFO;
The ATM cell sending module is used for reading non-standard ATM cell from descending transmission FIFO, and the ATM cell that standard is formed to the relevant position in the cell in calculating interpolation HEC territory sends.
Corresponding the present invention also provides a kind of AOP frame to be converted to the method for ATM data, it is characterized in that, comprise: at first, receive the AOP frame and carry out buffer memory, the frame head information of described AOP frame comprises cell number amount CN, and the payload of described AOP frame comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number; Then, the non-standard ATM cell that the payload of AOP frame is comprised splits out, and calculates and add the ATM cell of forming standard to the relevant position in the cell in the HEC territory and send.
Wherein, the non-standard ATM cell that the payload of AOP frame is comprised splits out a laggard step and comprises: whether the frame head information check transmission frame according to the AOP frame is correct, if then continue current flow process, otherwise produce warning information.
Wherein, described frame head information comprises: cell quantity CN, sequence number Seq; Described frame payload comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number.
Wherein, described frame head information further comprises: certain the frame frame head information that is used to encapsulate the AOP frame.
The present invention also provides a kind of transmission switching system, comprises business board, central power board, it is characterized in that,
Business board comprises atm module, with the ATM data of atm module polyphone and circuit, the interface device of AOP frame format conversion; Wherein, described circuit comprises that the ATM data are converted to the circuit of AOP frame and the circuit that the AOP frame is converted to the ATM data; Wherein,
Atm module is used to realize the mutual of business board and outside ATM data; The circuit of ATM data and the conversion of AOP frame format is used to realize the conversion of ATM data and frame format; Interface device is used to realize business board and central power board transmission frame data;
Central authorities' power board is used to finish the exchange based on the AOP data of the ATM data of frame encapsulation, and the frame head information of described AOP frame comprises cell number amount CN, and the payload of described AOP frame comprises and described cell number value equal number has removed the ATM cell in HEC territory.
The invention provides a kind of transmission switching method accordingly, it is characterized in that, comprising:
Business board receives outside ATM data, and the ATM data are converted to AOP frame format data, is transferred to central power board then; Central authorities' power board exchanges described AOP frame format data, and the AOP frame format data after will exchanging then send to the corresponding business plate; Described corresponding service plate receives described AOP frame format data, is converted to the ATM data, sends to the business board outside.
By said method as can be seen, the circuit of ATM data provided by the invention and frame format conversion transmits switching system accordingly, and the method for corresponding ATM data and frame format conversion, makes the ATM data to be encapsulated among the AOP easily.Because being stored in respectively in the memory of frame payload and frame head correspondence, when encapsulation, decapsulation, can assemble rapidly and seal off, and, the content of frame head memory can be added other frame head information as required, and then can easily the AOP frame be encapsulated in other the frame structure and transmit, in MPLS, Ethernet.Solved the technology that the ATM data are transmitted and exchanged in frame transmission switching system.
And the AOP frame is not distinguished AAL1, AAL2, AAL3/4 or AAL5 to the ATM cell of being carried, and can carry, and the AOP frame does not relate to complicated control and management agreement, realizes simple.
Description of drawings
Fig. 1 is the ATM cell structure chart
Fig. 2 is the graph of a relation of FATE and other agreements.
Fig. 3 is the AOP frame assumption diagram of the present invention's definition.
Fig. 4 is packaged in data format figure on the Ethernet frame for the AOP frame.
Fig. 5 is AOP and ATM change-over circuit figure.
Fig. 6 is up framing module circuit diagram.
Fig. 7 is transmission switching system schematic diagram.
Embodiment
ATM data encapsulation framing structure is transmitted in frame transmission and switching system for convenience, the present invention has defined a kind of frame structure (AOP frame) of encapsulation atm data, show defined AOP frame structure as Fig. 3, comprise AOP frame head (AOP Header) and AOP frame payload (AOP Payload).
The AOP frame head comprise cell quantity (CN, Cell Number), sequence number (Seq, SequenceNumber).Wherein CN length is 1 byte, is used for representing that the frame payload comprises the quantity of removing ATM cell behind the HEC territory, and allowing the maximum cell quantity of carrying on the AOP frame theory is 255.Actual AOP frame allows the cell quantity of carrying to determine according to actual operating position, when being packaged on the Ethernet frame when the AOP frame, considers that the frame length of whole Ethernet frame can not surpass 1518 bytes, and then the maximum of CN is 28 at this moment.
Seq length is two bytes, is used for identifying each AOP frame that every frame connects, and Seq adds 1 successively when transmit leg sends the frame of identical Packet ID successively, and whether the recipient judges continuously according to Seq whether the transmission course that this frame connects frame losing takes place.
In order frame head to be gathered be 4 integral multiple, be convenient to later encapsulation, also there is the reservation territory (Res) of a byte-sized at frame head.
AOP frame payload is packaged ATM data.AOP frame payload comprises CN segmentation, and (Seg, Segment), each segmentation comprises 52 bytes, is used for storing a non-standard ATM cell.The cell length of standard A TM cell is 53 bytes, and wherein head error detection occurs (HEC) territory in the ATM cell head is 1 byte, and the data of storing in each segmentation are exactly the ATM cell of removing behind the HEC territory, are called non-standard ATM cell here.
The AOP frame can be packaged in the various frame structures easily, as Ethernet, MPLS etc., need be in the time of encapsulation with the 4 byte formats alignment of AOP frame, with convenient the AOP frame is carried out parallel processing, show the AOP frame as Fig. 4 and be packaged in data format on the Ethernet frame: target MAC (Media Access Control) address (Dest MAC Addr) and source MAC (Src Mac Addr) length respectively are 6 bytes; Frame type (Ether Type) is 2 bytes, if this is worth less than 1500, then expression is length, if this is worth more than or equal to 1536, then expression is type, and the AOP frame is represented with a specific frame type value.Frame Check Sequence (FCS) is 4 bytes, is 4 byte field that comprise the cyclic redundancy check (CRC) code (CRC) of entire frame.Here, in order to guarantee the 4 byte formats alignment of AOP frame, before the AOP frame, added the region filling (Pad) of 2 bytes.
In order to realize the mutual conversion of form between ATM data and the AOP frame, the invention provides ATM and be converted to the circuit of AOP frame format conversion and the circuit that AOP is converted to ATM, these two kinds of circuit are referred to as the circuit of ATM data and AOP frame format conversion here.Below by specific embodiment with reference to accompanying drawing, the present invention is described in more detail.
The circuit of ATM data as shown in Figure 5 and the conversion of AOP frame format comprises that the ATM data are converted to the circuit part of AOP frame and the circuit part that the AOP frame is converted to the ATM data.Wherein, the ATM data circuit that is converted to the AOP frame comprises ATM cell receiver module, up reception FIFO, up framing module, up lookup table memories, up transmission FIFO, frame transmission interface module.The circuit that the AOP frame is converted to the ATM data comprises frame receiving interface module, descending reception FIFO, descending frame module, descending transmission FIFO, the ATM cell sending module torn open.
The ATM cell receiver module is used to finish the ATM side joint to be received the sequential of interface and cooperates, and receives from the ATM side joint to receive ATM cell the interface and it is write among the up reception FIFO.Wherein, when the ATM cell receiver module write ATM cell to up reception FIFO, what write was not standard A TM cell, but had removed the non-standard cell in header HEC territory, so that write the cell length of up reception FIFO is the integral multiple of 4 bytes, the processing when making things convenient for back group AOP frame.The ATM side interface has multiple different interface standard, designs according to the corresponding interface standard that is adopted in the real system.
Up reception FIFO and descending transmission FIFO are cell level FIFO, internal separation is the buffering area of a plurality of same capabilities, each buffering area is used for storing a non-standard ATM cell of removing header HEC territory, and the design of cell level FIFO belongs to ripe design, does not do at this and gives unnecessary details.
The address of up lookup table memories and the VPI of ATM cell (VPI) and VCI (VCI) value exist mapping relations, that is to say the address that just can correspond to corresponding up lookup table memories according to the VPI and the VCI value of ATM cell.The data of up lookup table memories storage comprise: desire sends destination interface sign, the transmission enabler flags of cell.The destination interface sign that desire sends cell is used for indicating up framing module will described non-standard ATM cell writes which formation of up transmission FIFO, and the corresponding destination interface of each formation that wherein sends FIFO identifies; Whether the transmission enabler flags is used to control non-standard ATM cell and sends, if it is effective to send enabler flags, then this ATM cell can be written to up transmission FIFO; If it is invalid to send enabler flags, show that this ATM cell is not enabled, then this ATM cell will be dropped and produce alarm, and can not be written to up transmission FIFO.Up lookup table memories also can be regarded as the VPI and the VCI value that are used for by non-standard ATM cell and finds out the purpose veneer that this cell need mail to, and converges to and forms the AOP frame together so that will mail to the non-standard ATM cell of same purpose veneer.
Up transmission FIFO is the frame level FIFO of many formations, and internal separation is a plurality of formations, and a desire in the corresponding up lookup table memories of each formation sends the destination interface sign of cell; Each inner queue is divided into the buffering area of a plurality of same capabilities again, and each buffering area can be stored the AOP frame of a maximum length, and the frame level FIFO design of many formations belongs to ripe design, does not do at this and gives unnecessary details.It should be noted that because the AOP frame is elongated frame,, be convenient to frame transmission interface block region and tell each AOP frame so up transmission FIFO also needs storage frame to begin and frame end mark except the storage frame content.
Up framing module is used for regularly reading the non-standard ATM cell of having removed header HEC territory from up reception FIFO, and from up lookup table memories, find the destination interface sign that this non-standard ATM cell mails to and send enabler flags according to the VPI of header and VCI, when the transmission enabler flags is effective, this cell is written in the corresponding formation of up transmission FIFO according to the destination interface sign.When the AOP frame payload of storing in certain formation of up transmission FIFO reaches the maximum cell number of permission or time that distance writes first cell when surpassing the set maximum of system and allowing propagation delay time, up framing module is added the frame head information sets and is dressed up complete AOP frame before the payload of the AOP frame of this formation of up transmission FIFO, and the AOP frame of notification frame transmission interface module after will assembling sends.
Show up framing inside modules schematic block circuit diagram as Fig. 6, comprise CN memory, Seq memory, time delay administration module and scheduler module.
The CN memory is used to store the quantity that sends to each formation of up transmission FIFO, forms the non-standard ATM cell of an AOP frame, and storage depth is for sending the number of destination interface, and the data length of storage is 1 byte.Scheduler module group during an AOP frame every formation to up transmission FIFO write an ATM cell and just from this memory, read and write this memory again after the CN value of respective queue adds 1, when finishing the framing of an AOP frame, scheduler module is read respective queue from this memory CN value writes the CN territory of AOP frame head and the CN value zero clearing of respective queue in this memory, so that the CN territory of next AOP frame is counted.
The Seq memory is used to store the sequence number that each formation of up transmission FIFO sends the AOP frame, and storage depth is for sending the number of destination interface, and the data length of storage is 2 bytes.Scheduler module corresponding Seq value of formation group is read this AOP frame during an AOP frame from this memory under writes the Seq territory of AOP frame head, and this value is added 1 deposit the Seq memory in, and the like, each Seq value that sends the AOP frame is bigger by 1 than the Seq value that sent the AOP frame last time.
The time delay administration module is used for each formation of up transmission FIFO time delay when the framing is managed, when scheduler module when certain formation of up transmission FIFO writes first ATM cell and begins framing, scheduler module is stored temporal information this moment in the time delay administration module, this temporal information of the continuous poll of logical circuit of time delay administration module inside also compares with the current time, when the maximum allowable delay of time delay greater than system's setting, the time delay administration module sends request to scheduler module, after scheduler module detects this request, in the AOP frame of up transmission FIFO respective queue, write complete frame head information, comprise CN, Seq and region filling, framing and the notification frame transmission interface module of finishing this AOP frame send this frame.
Scheduler module is the core processing module of up framing module, its major function is the up reception FIFO of inquiry, read ATM cell, by inquiring about up lookup table memories, up transmission fifo status and CN memory, Seq memory and the time delay administration module of up framing inside modules managed calls, and finishes the framing work of AOP frame.
In addition,, directly the AOP frame is encapsulated in other frame structures, also should stores the relevant information of other frame structures in the up framing module if desired without other processing.For example: in the time of need directly being encapsulated in the AOP frame in the Ethernet frame, up framing module also needs a memory to be used for storing the relevant informations such as Ethernet frame target MAC (Media Access Control) address of each destination interface, carries out framing to make things convenient for scheduler module to call it.
AOP frame transmission interface module is used to finish the sequential cooperation of frame transmission interface, reads the AOP frame and sends to outside frame interface from up transmission FIFO.Frame interface has multiple different interface standard, designs according to the corresponding interface standard that is adopted in the real system, this Module Design is not carried out concrete introduction at this.
AOP frame receiving interface functions of modules is opposite with AOP frame sending module, and the sequential that frame receiving interface module is finished the frame receiving interface cooperates, and receives the AOP frame and it is write descending reception FIFO from the frame receiving interface.It should be noted that frame receiving interface module need write descending reception FIFO to start of frame delimiter and frame end mark together when descending reception FIFO writes the frame that receives because the AOP frame is elongated frame, the descending like this frame module of tearing open just can be distinguished each frame.Frame interface has multiple different interface standard, designs according to the corresponding interface standard that is adopted in the real system, this Module Design is not carried out concrete introduction at this.
Descending reception FIFO is the frame level FIFO of single formation, and internal separation is the buffering area of a plurality of same capabilities, and each buffering area can be stored the AOP frame of a maximum length, and the design of frame level FIFO belongs to ripe design, does not do at this and gives unnecessary details.
The descending frame module of tearing open is read the AOP content frame that receives from descending reception FIFO, CN territory by inquiry AOP frame head knows what ATM cell this AOP frame has carried, then each non-standard ATM cell of the payload of AOP frame is split out, be that unit splits out and a CN thresholding equal number non-standard ATM cell promptly, write descending transmission FIFO again according to 52 bytes.Descendingly tear the Seq value that frame module also will be inquired about the AOP frame head open, it and the Seq value that received the AOP frame last time are compared,, illustrate frame losing does not take place in the transmission course if current Seq value is bigger by 1 than the Seq value of last time; If be other values, illustrate then frame losing in transmission course, to have occurred that the descending frame module of tearing open produces alarm.When a plurality of ports being arranged in the system when frame receiving interface module sends the AOP frame, the descending frame module of tearing open need latch respectively the Seq value of the AOP frame that sends from each transmit port and judge.
The sequential that the ATM cell sending module is finished ATM side transmission interface cooperates, and reads ATM cell and it is sent from ATM side transmission interface from descending transmission FIFO.It should be noted that the ATM cell of storing among the descending transmission FIFO is a non-standard ATM cell of having removed header HEC territory, therefore the ATM cell sending module needs to calculate and add standard is formed in the HEC territory to the relevant position in the cell ATM cell when ATM side transmission interface sends ATM cell.The ATM side interface has multiple different interface standard, designs according to the corresponding interface standard that is adopted in the real system, this Module Design is not carried out concrete introduction at this.
By above circuit, can realize that just the data that the ATM data are converted to the AOP frame format transmit, specifically, may further comprise the steps:
At first, the ATM cell receiver module receives the outside ATM cell that passes over, remove header HEC territory after, these non-standard ATM cell of removing header HEC territory are written among the up reception FIFO carry out buffer memory; Then, up framing module is regularly read non-standard ATM cell as the frame payload from up reception FIFO, and from up lookup table memories, search the destination interface sign that corresponding desire sends cell according to the VPI of header and VCI, should non-standard ATM cell be written to buffer memory in the up transmission FIFO corresponding queues according to the destination interface sign; When needs sent the AOP frame, up framing module was added frame head information CN, Packet ID before the payload of the AOP frame of this formation of up transmission FIFO, be assembled into complete AOP frame; And from up transmission FIFO, read the AOP frame and send to outside frame interface by AOP frame sending module.
The data that also can realize the AOP frame format are converted to the ATM data and transmit, and specifically, may further comprise the steps:
At first, AOP frame receiving interface module receives the AOP frame and sends to descending reception FIFO from the frame interface of outside and carries out buffer memory; Then, the descending frame module of tearing open is read the AOP frame that receives from descending reception FIFO, Packet ID by inquiry AOP frame head judges whether received frame is correct, if it is incorrect, then produce warning information, if correctly then learn according to the CN territory how many non-standard ATM cell this AOP frame has carried, be the payload of AOP frame that unit splits out with a CN thresholding equal number non-standard ATM cell and writes descending transmission FIFO according to 52 bytes then; Then, the sequential that the ATM cell sending module is finished ATM side transmission interface cooperates, and reads ATM cell and calculate and add the relevant position of HEC territory in the cell from descending transmission FIFO, and the ATM cell of forming standard sends.
The circuit of changing mutually by above-mentioned ATM data that provide and AOP frame, can finish the conversion of ATM data and AOP frame format easily, and the conversion of ATM data and other frame formats that are used to encapsulate the AOP frame, as ATM data and the Ethernet that is used to encapsulate the AOP frame, the conversion of MPLS frame.On this basis, the present invention also provides a kind of ATM transmission and switching system, transmission switching system as shown in Figure 7, this system adopts ATM mode and outside to communicate, and the internal system transmission adopts point-to-point high speed serialization line to design, be to pass through HSSI High-Speed Serial Interface between internal system central authorities' power board and each business board node,, utilize the frame format data to communicate as the GE interface.Wherein, central power board has been finished the exchange based on the ATM data of frame format, and business board has been finished the outside ATM data of reception and the conversion of frame format.
Wherein, business board except comprise above-mentioned AOP and ATM the conversion circuit as the ATM-AOP modular converter, also comprise atm module and interface device.Wherein, ATM-AOP frame modular converter is converted to the circuit of AOP frame by the ATM data and circuit that the AOP frame is converted to the ATM data is realized, finish the conversion of ATM data and AOP frame format, perhaps finish in the ATM encapsulation framing procedure, directly be encapsulated in the HSSI High-Speed Serial Interface conversion between the employed frame format of transmission, as ATM be used to encapsulate the Ethernet of AOP, the conversion of MPLS frame.Atm module is used for carrying out with ATM-AOP frame modular converter the reception and the transmission of ATM data, and atm interface externally is provided, and finishes the external line interface function of this transmission switching system.Interface device provides the electric interfaces and the data-transformation facility of HSSI High-Speed Serial Interface, realizes that the ATM-AOP modular converter of business board and central power board pass through HSSI High-Speed Serial Interface transmission frame data.
Corresponding transmission switching method comprises: business board receives outside ATM data, and the ATM data are converted to AOP frame format data, is transferred to central power board then; Central authorities' power board exchanges described AOP frame format data, and the AOP frame format data after will exchanging then send to the corresponding business plate; Described corresponding service plate receives described AOP frame format data, is converted to the ATM data, sends to the business board outside.
As can be seen, ATM transmission provided by the invention and switching system, this system communicates by the ATM data flow with outside.And internal system is joined by HSSI High-Speed Serial Interface between business board node and the central power board, adopts frame format to carry out the transmission and the exchange of data, and this system can be used for the transmission network of existing ATM for the basis.Because this system has introduced the advantage of frame switching system, is with a wide range of applications.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. ATM data are converted to the circuit of AOP frame, and described AOP frame is the frame that is packaged with the ATM data; It is characterized in that, comprising: ATM cell receiver module, up reception FIFO, up framing module, up lookup table memories, up transmission FIFO, frame transmission interface module; Wherein,
The ATM cell receiver module is used for receiving interface from the ATM side joint and receives ATM cell, and removes the head error detection occurs HEC territory of header, is written among the up reception FIFO as non-standard ATM cell and carries out buffer memory;
The VPI VPI of the address of up lookup table memories and the ATM cell of reception and VCI VCI value exist mapping relations, are used to store the destination interface sign that desire sends cell;
Up transmission FIFO internal separation is a plurality of formations, and a desire in the corresponding up lookup table memories of each formation sends the destination interface sign of cell, is used for non-standard ATM cell that buffer memory sends over as AOP frame payload;
Up framing module is used for regularly reading non-standard ATM cell from up reception FIFO, and from up lookup table memories, find the destination interface sign that described cell desire sends according to the VPI of header and VCI, according to described destination interface sign described cell is written in the up transmission FIFO corresponding queues as AOP frame payload buffer memory; And, be used for before the payload of the AOP frame of up transmission FIFO individual queue, adding the frame head information sets and dress up complete AOP frame, described frame head information comprises cell number amount CN, and the payload of described AOP frame comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number;
Frame transmission interface module is used for reading the AOP frame and sending to outside frame interface from up transmission FIFO.
2. change-over circuit according to claim 1 is characterized in that, described up framing module comprises: CN memory, Seq memory, scheduler module; Wherein,
The CN memory is used to store the quantity CN of the non-standard ATM cell that each formation of up transmission FIFO stored, as the partial information of frame head;
The Seq memory is used to store the sequence number Seq that each formation of up transmission FIFO sends the AOP frame, as the partial information of frame head;
Scheduler module is used for the up reception FIFO of outside, up lookup table memories, up transmission FIFO are managed and call; And CN memory, the Seq memory of up framing inside modules managed and call, finish framing work.
3. change-over circuit according to claim 2 is characterized in that, described up framing module further comprises the time delay administration module, and the time delay when being used for each formation framing to up transmission FIFO manages, and is managed by up framing module and calls.
4. according to claim 2 or 3 described change-over circuits, it is characterized in that up framing module further comprises: store the memory module of certain frame structure information that is used to encapsulate the AOP frame, call by scheduler module when being used for framing.
5. ATM data that are converted to the circuit of AOP frame based on the described ATM data of claim 1 are converted to the method for AOP frame, it is characterized in that the formation that different VPI and VCI are corresponding different also comprises step:
At first, the ATM cell that receives is removed header HEC territory and carry out buffer memory as non-standard ATM cell;
Then, read non-standard ATM cell, and write in the corresponding queues as frame payload buffer memory according to the VPI and the VCI of cell;
Add the frame head information sets then and dress up complete AOP frame before the frame payload of this formation, send, described frame head information comprises cell number amount CN, and described frame payload comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number.
6. method according to claim 5 is characterized in that, described frame head information further comprises: sequence number Seq.
7. method according to claim 5 is characterized in that, described frame head information further comprises: as the reservation territory Res that fills.
8. method according to claim 5 is characterized in that, described frame head information further comprises: certain the frame frame head information that is used to encapsulate the AOP frame.
9. method according to claim 8 is characterized in that, described certain frame is an ether Ethernet frame, and the frame head information that is used to encapsulate the Ether frame structure of AOP frame accordingly comprises mac address information.
10. an AOP frame is converted to the circuit of ATM data, it is characterized in that, comprising: frame receiving interface module, descending reception FIFO, descending frame module, descending transmission FIFO, the ATM cell sending module torn open; Wherein,
Frame receiving interface module is used for from the frame interface reception AOP frame of outside and sends to descending reception FIFO carrying out buffer memory, the frame head information of described AOP frame comprises cell number amount CN, and the payload of described AOP frame comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number;
Descendingly tear the AOP frame that frame module is used for reading from descending reception FIFO buffer memory open, and the non-standard ATM cell that the payload of AOP frame comprises split out write descending transmission FIFO;
The ATM cell sending module is used for reading non-standard ATM cell from descending transmission FIFO, and the ATM cell that standard is formed to the relevant position in the cell in calculating interpolation HEC territory sends.
11. an AOP frame that is converted to the circuit of ATM data based on the described AOP frame of claim 10 is converted to the method for ATM data, it is characterized in that, comprising:
At first, receive the AOP frame and carry out buffer memory, the frame head information of described AOP frame comprises cell number amount CN, and the payload of described AOP frame comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number; Then, the non-standard ATM cell that the payload of AOP frame is comprised splits out, and calculates and add the ATM cell of forming standard to the relevant position in the cell in the HEC territory and send.
12. method according to claim 11, it is characterized in that the non-standard ATM cell that the payload of AOP frame is comprised splits out a laggard step and comprises: whether the frame head information check transmission frame according to the AOP frame is correct, if, then continue current flow process, otherwise produce warning information.
13. method according to claim 12 is characterized in that, described frame head information comprises: cell quantity CN, sequence number Seq; Described frame payload comprises and the individual ATM cell of having removed the HEC territory of described cell number value equal number.
14. method according to claim 12 is characterized in that, described frame head information further comprises: certain the frame frame head information that is used to encapsulate the AOP frame.
15. a transmission switching system comprises business board, central power board, it is characterized in that,
Business board comprises atm module, with the ATM data of atm module polyphone and circuit, the interface device of AOP frame format conversion; Wherein, described circuit comprises that the ATM data are converted to the circuit of AOP frame and the circuit that the AOP frame is converted to the ATM data; Wherein,
Atm module is used to realize the mutual of business board and outside ATM data; The circuit of ATM data and the conversion of AOP frame format is used to realize the conversion of ATM data and frame format; Interface device is used to realize business board and central power board transmission frame data;
Central authorities' power board is used to finish the exchange based on the AOP data of the ATM data of frame encapsulation, and the frame head information of described AOP frame comprises cell number amount CN, and the payload of described AOP frame comprises and described cell number value equal number has removed the ATM cell in HEC territory.
16. the transmission switching method based on the described transmission switching system of claim 15 is characterized in that,
Business board receives outside ATM data, and the ATM data are converted to AOP frame format data, is transferred to central power board then;
Central authorities' power board exchanges described AOP frame format data, and the AOP frame format data after will exchanging then send to the corresponding business plate;
Described corresponding service plate receives described AOP frame format data, is converted to the ATM data, sends to the business board outside.
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| CN101964777A (en) * | 2009-07-24 | 2011-02-02 | 中兴通讯股份有限公司 | Method, device and system for transmitting and processing cells in asynchronous transfer mode |
| CN101984609A (en) * | 2010-11-24 | 2011-03-09 | 中兴通讯股份有限公司 | Method for realizing asynchronous transfer mode (ATM) multi-cell encapsulated circuit simulation and network processor |
| CN103188174B (en) * | 2011-12-31 | 2017-02-08 | 北京大唐高鸿软件技术有限公司 | Line-speed processing cell method and device of automatic teller machine (ATM) multiple service access exchange board |
| CN103701715A (en) * | 2012-09-27 | 2014-04-02 | 京信通信系统（中国）有限公司 | Method and device for sending and receiving Ethernet data packet based on multiple E1 channels |
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