CN100493075C - Method for hybrid transmission of variable-length data packet and fixed length cell, and adaptation device - Google Patents

Method for hybrid transmission of variable-length data packet and fixed length cell, and adaptation device Download PDF

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CN100493075C
CN100493075C CNB2003101058904A CN200310105890A CN100493075C CN 100493075 C CN100493075 C CN 100493075C CN B2003101058904 A CNB2003101058904 A CN B2003101058904A CN 200310105890 A CN200310105890 A CN 200310105890A CN 100493075 C CN100493075 C CN 100493075C
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data unit
protocol data
cell
sdh
ufpdu
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CN1543162A (en
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徐展琦
毛谦
刘增基
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Xidian University
Wuhan Research Institute of Posts and Telecommunications Co Ltd
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Xidian University
Wuhan Research Institute of Posts and Telecommunications Co Ltd
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Abstract

This invention discloses a method and an adaptive device for hybrid- transferring variable-length data packets and fixed size cells. The method and the device finish the images between the packet and the UFPDU, the fixed size cell and the rectified asynchronous transition mode (ATM) cell. The UFPDU and rectified ATM cell are transferred on a same VC/VT or a bare fiber/cable of SDH/SONET after processed by mix or separation, rate adaptation, penetrability conversion, scrambling or de-scrambling, image or fetch. The mark of UFPDU is compatible with that of the ATM, connection or connectionless ways are applied for the variable length data packet transfer.

Description

Elongated packet mixes method and the adaptive device that transmits with fixed length cell
Technical field:
The present invention relates to data relevant in the information network transmits.On the same virtual container/empty branch road VC/VT or bare fiber/cable that is particularly related at SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET transmission line, mix the method and the adaptive device that transmit elongated packet and two kinds of protocol Data Unit PDU of fixed length cell, can be for information about, the network equipment provides grouping to transmit interface, for example asynchronous transfer mode atm interface, Ethernet Media Independent Interface MII.
Background technology:
In various transmission systems and information network, network endpoint utilizes SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET equipment to finish the transmission of variable-length packets or asynchronous transfer mode ATM cell.Elongated packet (Internet protocol IP grouping, Ethernet medium access control MAC frame) is packaged into ppp protocol data cell PDU through peer-peer protocol PPP, this protocol Data Unit (PPP PDU) passes through High-Level Data Link Control HDLC again (or through the Link Access Procedure LAPS on the SDH, or through Generic Framing Procedure GFP) be packaged into the corresponding protocol data cell, in a virtual container/empty branch road VC/VT of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET, transmit then.Elongated packet also can be through ATM Adaptation Layer (AAL) adaptation processing in the asynchronous transfer mode atm network, cut apart by fixed length again, be assembled into the asynchronous transfer mode ATM cell with cell header, in a virtual container/empty branch road VC/VT of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET, transmit.Elongated packet also can transmit on bare fiber/cable through elongated protocol Data Unit and asynchronous transfer mode ATM cell that above-mentioned multiple technologies are packaged into.
The major defect of above-mentioned technology is among a virtual container/empty branch road VC/VT at SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or on bare fiber/cable, only can transmit a kind of protocol Data Unit PDU in elongated protocol Data Unit or the asynchronous transfer mode ATM cell, and can not transmit two kinds of protocol Data Unit PDU simultaneously, thereby make that the transmission efficiency of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or bare fiber/cable is lower.
Atm forum (ATM Forum) has defined frame load mode FAST (the Frame based ATM over SONET/SDH Transport on SDH (Synchronous Digital Hierarchy) SDH based on ATM, fb-fbatm-0151.000, July, 2000), adopt the high-rise user data packets of ATM Adaptation Layer AAL protocol encapsulation, but its major defect is:
(1) carrying user data mainly adopts ATM Adaptation Layer AAL5 encapsulation, causing link layer unit to be transmitted is the integral multiple (cell header 4/8 byte that does not comprise the atm forum definition) of 48 bytes, maybe will wait to transmit the unit and add filling (Padding) so that it becomes the integral multiple of 48 bytes;
(2) adopt 32 Frame Check Sequence FCS in the FAST frame format, but in most of the cases, voice or real-time video business do not need this frame check protection;
(3) do not mention clearly variable-length packets mixes how to distinguish two kinds of protocol Data Unit PDU when transmitting with the asynchronous transfer mode ATM cell;
(4) FAST does not provide the nothing that is similar to the Internet protocol IP network to connect data transport functions;
(5) when the high level data grouping was longer, FAST was divided into a plurality of FAST frames with it and transmits, but grouping serial number and position will take 3 byte overhead, and expense is bigger;
(6) do not provide load priority (as the priority of high level data customer service) among the protocol Data Unit PDU of FAST, thereby the forwarded node that makes connectionless-mode work, can not provide different forwarding exchanging policies to language/video, data service, can't guarantee the service quality QoS of active user business.
" system and method for grouping of mapping fixed length and variable-length packets on SONET/SDH " (WO 0217543) that is proposed by SCOTT JAMES, WEN-LUNG CHEN, GORDON LEE is by the byte (n is a positive integer) of 4n cell of storage, with these asynchronous transfer mode ATM cell byte streams be mapped to the elongated packet that High-Level Data Link Control HDLC encapsulates among the multi-frame Superframe of the individual empty branch road VT composition of 4n.The shortcoming of this scheme is: (1) variable-length packets adopts different encapsulation with the fixed length grouping, and the realization complexity of associated transport and switching equipment is increased; (2) because switching equipment utilizes Virtual Path Identifier/virtual path identifiers VPI/VCI to realize cell switching, and adopt High-Level Data Link Control HDLC frame can only realize the point-to-point transmission, can't finish variable-length packets and fixed length packet switching with a kind of crosspoint; (3) because n is variable, the multi-frame structure complexity, and increased the end-to-end transfer delay of asynchronous transfer mode ATM cell.
Summary of the invention:
The objective of the invention is to overcome the deficiency of above-mentioned prior art, propose a kind of elongated packet and mix method and the adaptive device thereof that transmits with fixed length cell, be used for realizing between network endpoint elongated packet and cell, in same virtual container/empty branch road VC/VT or the transmission of the mixing on bare fiber/cable of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET.
Realize the elongated packet and fixed length cell mixing transfer approach of the object of the invention, comprise the transmission processing that sends and receive both direction, as shown in Figure 1.The handling process of this method under SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or bare fiber/cable load mode be difference slightly, wherein:
Sending direction is undertaken by the described following process of Fig. 1 (a):
(1) Media Independent Interface MII, asynchronous transfer mode universal test and the operation-interface UTOPIA interface of use standard, receive elongated Frame and fixed length cell from user terminal, transmission equipment and switch network parts, with the payload segment in the elongated Frame, it is elongated packet, deposit in and send the grouping push-up storage, and cell is directly put into transmission cell push-up storage;
(2) elongated packet is added control header and extension header and packet checks sequence PCS, be packaged into unified framing protocol Data Unit UFPDU, simultaneously fixed length cell is transformed into the cell format of modification;
(3) between unified framing protocol Data Unit UFPDU and cell, add " the distinctive mark F " that distinguishes both borders, with border between difference different agreement data cell PDU, and, the cell of unified framing protocol Data Unit UFPDU and modification is mixed according to the service quality QoS characteristic of customer service;
(4) in the mixed flow of " distinctive mark F " and unified framing protocol Data Unit UFPDU and cell composition, add filling protocol Data Unit PPDU, guarantee that this speed sum equals the transmission net rate of the virtual container of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET/empty branch road VC/VT or bare fiber/cable line, to realize rate adapted;
(5) unified framing protocol Data Unit UFPDU, cell and filling protocol Data Unit PPDU being carried out the transparency handles, promptly among unified framing protocol Data Unit UFPDU, cell and three kinds of protocol Data Unit PDU of filling protocol Data Unit PPDU of sending, " the distinctive mark F " of appearance handles;
(6) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, mixed flow with " distinctive mark F ", unified framing protocol Data Unit UFPDU, cell, filling protocol Data Unit PPDU composition, pack into or be mapped to virtual container/empty branch road VC/VT of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET, and to the net load among virtual container/empty branch road VC/VT, the employing multinomial is that the self-synchronous scrambler of x43+1 carries out scrambling; When bare fiber/cable load mode, only above-mentioned mixed flow being adopted multinomial is that the self-synchronous scrambler of x43+1 carries out scrambling;
(7) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, the section overhead SOH and the path overhead POH that net load after the scrambling are added SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET frame, form SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET transmit frame, and this transmit frame is adopted multinomial g (x)=x 7+ x 6+ 1 carries out scrambling;
(8) to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET transmit frame, or the byte of the above-mentioned mixed flow during bare fiber/cable load mode is carried out the bit conversion, and use tranmitting data register to produce the difference outputting data signals, the driving by to this outputting data signals outputs on the circuit.
Receive direction is undertaken by the described following process of Fig. 1 (b):
Mixed flow when (1) receiving SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET transmit frame or bare fiber/cable load mode, recovered clock and data or direct input clock are transformed to byte with data bit from the differential data of input;
(2) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, according to (the A of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET frame 1, A 2) byte is carried out the frame demarcation, and employing descrambling multinomial g (x)=x 7+ x 6+ 1 carries out descrambling;
(3) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, take out and handle the section overhead SOH and the path overhead POH of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET frame, whether the detection line far-end worsens indication RDI, alarm indication signal AIS, byte-interleaved parity check BIP-8 or BIP-96 mistake takes place, and provides corresponding wrong indication;
(4) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode,, take out the net load among virtual container/empty branch road VC/VT according to the pointer indication in the control expense;
(5) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, if multinomial x is then adopted in the net load scrambling among transmit leg virtual container/empty branch road VC/VT 43+ 1 carries out the motor synchronizing descrambling; When bare fiber/cable load mode, the data byte of scrambling is adopted multinomial x 43+ 1 carries out descrambling;
(6) search " distinctive mark F " in the byte stream that receives, and carry out byte and " go to fill " processing, PPDU form 3 among the filling protocol Data Unit PPDU of identification and deletion rate adapted and aborted grouping are carried out subsequent treatment with the data between two " distinctive mark F " as a protocol Data Unit PDU;
(7) when transmit leg is unified header error control HEC field in framing protocol Data Unit UFPDU or the cell and is existed, I.361 finish the error control of protocol Data Unit PDU header handles according to the ITU of International Telecommunication Association, the protocol Data Unit PDU correct to header error control HEC carries out subsequent treatment, still incorrect protocol Data Unit PDU after abandoning header error control HEC and handling;
(8) in the correct protocol Data Unit PDU of the header error control HEC that receives, unified framing protocol Data Unit UFPDU of identification and cell, if load type PT field ≠ 111B and length are 52/53, judge that then this protocol Data Unit PDU is a cell, if load type PT=111B, judge that then this protocol Data Unit PDU is unified framing protocol Data Unit UFPDU, when the packet checks sequence PCS of unified framing protocol Data Unit UFPDU exists, again it is carried out cyclic redundancy check (CRC)-32 and handle;
(9) handle filling protocol Data Unit PPDU, the load of unified framing protocol Data Unit UFPDU is taken out, put into and receive the grouping push-up storage, and cell carried out protocol Data Unit (PDU) format conversion, this protocol Data Unit (PDU) cell is put into received cell push-up storage (FIFO) again;
(10) according to the call format of transport protocol data unit PDU on Media Independent Interface MII, asynchronous transfer mode universal test and the operation-interface UTOPIA interface of standard, take out to receive grouping and cell in the packet/cell push-up storage, send to these network componentses of user terminal, transmission equipment and switch after finishing format conversion.
Above-mentioned elongated packet mixes the method that transmits with fixed length cell, wherein unified framing protocol Data Unit UFPDU is made up of control header, extension header, elongated packet and packet checks sequence PCS field successively.
Above-mentioned elongated packet mixes the method that transmits with fixed length cell, wherein rate adapted is when not sending cell, according to priority send unified framing protocol Data Unit UFPDU from high to low successively, if neither post a letter unit, when not sending out framing protocol Data Unit UFPDU unified yet, transmission is used for the filling protocol Data Unit PPDU of rate adapted, and this filling protocol Data Unit PPDU has different forms.
Above-mentioned elongated packet mixes the method that transmits with fixed length cell, wherein the process of transparent processing is:
(1) transmit leg will send " the distinctive mark F " that occur among the protocol Data Unit PDU and be replaced into two bytes, and one is " 8 binary system groups of escape ", and another is the numerical value after " distinctive mark F " and " filling special mask " are carried out distance;
(2) transmit leg will send " 8 binary system groups of escape " of occurring among the protocol Data Unit PDU and also be replaced into two bytes, one is " 8 binary system groups of escape ", and another is the numerical value after " 8 binary system groups of escape " and " filling special mask " (8 binary system groups) are carried out distance;
(3) " 8 binary system groups of escape " and the setting of " filling special mask " can change, and both default values are respectively 0x7d (16 system) and 0x20, then the transparent processing conversion 0x7e and 0x7d are replaced into respectively (0x7d, 0x5e) and (0x7d, 0x5d).
Above-mentioned elongated packet mixes the method that transmits with fixed length cell, wherein the recipient carries out the process that byte " go fill " handles and is, earlier with (0x7d, 0x5e) with (0x7d, 0x5d) be replaced into 0x7e and 0x7d respectively, again the data between two " distinctive mark F " discerned processing as a protocol Data Unit PDU.
Above-mentioned elongated packet mixes the method that transmits with fixed length cell, wherein be made up of following field the unified framing protocol Data Unit UFPDU that variable-length packets is packaged into:
(1) unify framing agreement virtual connections identifier/unification framing protocol network node identifier UFPVCI/UFPNNI field, this field is used to represent logic virtual connections sign or the stepped zone network node address of unified framing protocol Data Unit UFPDU.When the unified framing agreement of expression virtual connections identifier UFPVCI, its implication is similar to the Virtual Path Identifier/virtual path identifiers VPI/VCI in the asynchronous transfer mode ATM cell, is distributed by signaling protocol; When expression network node address, be used to distinguish the heterogeneous networks node in the unified framing agreement networking zone;
(2) load type PT field, this field are used for distinguishing the unified framing protocol Data Unit UFPDU and the fixed length cell of unified framing protocol Data Unit UFPDU and fixed length cell mixed flow;
(3) packet loss priority P LP field, this field is used for identifying the packet loss priority of unified framing protocol Data Unit UFPDU, in the grouping transport process, if appearance is congested in the switching/routing node, can abandon the grouping of PLP=1 earlier;
(4) header error control HEC field, this field adopts the identical processing of header error control HEC with the standard cell, is used for the correctness of guarantee agreement data cell PDU header;
(5) there is sign PCSE field in the packet checks sequence, and whether this field represents to use packet checks sequence PCS that the relevant field of unified framing protocol Data Unit UFPDU is carried out error control;
(6) packet-priority territory PPF field, this field is used to identify the load packet-priority of unified framing protocol Data Unit UFPDU, is convenient to network switch/routing node this protocol Data Unit PDU is carried out different processing;
(7) upper-layer protocol identifier ULPI field, this field are used for identifying the high level data protocol type information of unified framing protocol Data Unit UFPDU load;
(8) final stage indication LSI field, this field is used to identify a beginning or the middle part that certain load zones of unifying framing protocol Data Unit UFPDU is some high-rise User Agreement data cell PDU, still is intact part or the last part of some high-rise User Agreement data cell PDU;
(9) load p ayload field, this field are used to deposit the part (user data packets) of complete protocol Data Unit PDU of high-rise user or protocol Data Unit PDU, or operation management maintain OAM grouping;
(10) packet checks sequence PCS field, this field be used for to the header of unified framing protocol Data Unit UFPDU, extension header, data payload area or only extension header and data payload area carry out the error checking and correction protection, generator polynomial is g (x)=x 32+ x 26+ x 22+ x 16+ x 12+ x 11+ x 10+ x 8+ x 7+ x 5+ x 4+ x 2+ x+1;
It should be noted that the header error control HEC field among the unified framing protocol Data Unit UFPDU, whole header extension field, be that the packet checks sequence exists sign PCSE, packet-priority territory PPF, upper-layer protocol identifier ULPI, final stage indication LSI and packet checks sequence PCS field, can determine whether to use by network management.
Above-mentioned elongated packet mixes the method that transmits with fixed length cell, wherein filling protocol Data Unit PPDU has following five kinds of forms:
(1) fills PDU form 1, operation management maintain OAM when being used for the networking of unification framing agreement, this filling PDU comprises header and the load zones of unified framing protocol Data Unit UFPDU, and the load zones content is identical with the load of the operation management maintain OAM of asynchronous transfer mode ATM;
(2) filling PDU form 2, is the operation management maintain oam cell of asynchronous transfer mode ATM, and PDU is identical with the operation management maintain oam cell of the asynchronous transfer mode ATM of standard in this filling;
(3) fill PDU form 3, be made up of " distinctive mark F ", spcial character 0xdd and " distinctive mark F " three 8 binary system groups, this form is applicable to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or bare fiber/cable transmission circuit occupancy condition with higher;
(4) fill the PDU format 4, comprise the header of unified framing protocol Data Unit UFPDU, do not have extension header, load zones, packet checks sequence PCS field;
(5) filling PDU form 5, is the asynchronous transfer mode ATM idle cell of standard.
The transmission bandwidth of operation management maintain OAM Protocol Data Unit is depended in the transmission of filling PDU form 1 and form 2, when not sending filling PDU form 1 and form 2, preferably filling the PDU sending order is to fill PDU form 3, filling PDU format 4, filling PDU form 5.
The adaptive device of realizing the object of the invention comprises: the business side interface, grouping/ATM cell Packet/ATMCell push-up storage FIFO, unified framing protocol Data Unit/ATM cell UFPDU/ATM Cell sends processor, SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor, the line side interface, SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor, unified framing protocol Data Unit/ATM cell UFPDU/ATM Cell receiving processor, the expense interface, Microprocessor Interface unit or module, wherein SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET transmission processor and SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor only are used for SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode.
The function and the annexation of each module are as follows:
(1) business side interface, be used for by professional input/output interface transmission/receiving data frames and cell, grouping between realization and packet/cell push-up storage FIFO or cell transmit, finish the format conversion between the protocol Data Unit PDU among professional input/output interface and the packet/cell push-up storage FIFO, this interface is connected with professional input/output interface, transmission and reception packet/cell push-up storage FIFO;
(2) packet/cell (Packet/ATM Cell) push-up storage FIFO, comprise transmission/reception grouping push-up storage FIFO and transmission/four memories of reception cell push-up storage FIFO, be used to deposit the grouping and the cell of transmission and receive direction, these four memories are connected with business side interface, unified framing protocol Data Unit/cell UFPDU/ATMCell transmission or receiving processor;
(3) unify framing protocol Data Unit/cell UFPDU/ATM Cell and send processor, be used to finish grouping and cell with packet/cell push-up storage FIFO input, be packaged into the cell of unified framing protocol Data Unit UFPDU and modification respectively, the cell that mixes unified framing protocol Data Unit UFPDU and modification, add and fill protocol Data Unit PPDU, between protocol Data Unit PDU, add " the distinctive mark F " on difference border to realize rate adapted.After the net load of prepare to pack into virtual container/empty branch road VC/VT or bare fiber/cable transmission circuit carried out transparency processing and scrambling, when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, output to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET and send processor, and when bare fiber/cable load mode, directly output to the line side interface;
(4) SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor, be used for when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, unified framing protocol Data Unit/cell UFPDU/ATM Cell is sent the protocol Data Unit PDU mixed flow of processor input, be mapped to virtual container/empty branch road VC/VT of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET, produce section overhead SOH and path overhead POH, assembling SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET frame is to delivering to the line side interface after this frame scrambling;
(5) line side interface, be used for SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET is sent the input of processor, or unified framing protocol Data Unit/cell UFPDU/ATM Cell sends the input of processor, carry out parallel/serial exchange, produce tranmitting data register and differential data signals, data-signal is outputed on the circuit; From the physical circuit receiving input data signal, finishing recovery of receive clock signal and data recovers, the serial/parallel conversion of the line data of going forward side by side, according to two kinds of different load modes of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET and bare fiber/cable, send data after the conversion to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor, or unified framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor;
(6) SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor, to the data search of line side interface input to determine the original position of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET frame, and to the receiving data frames descrambling, take out section overhead SOH and path overhead POH in this frame, determine the original position of virtual container/empty branch road VC/VT original position, first complete protocol Data Unit PDU of load zones according to pointer mechanism, again data in this frame are delivered to unified framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor;
(7) unify framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor, be used for virtual container/empty branch road VC/VT net load district data to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor input, or the data of interface input in line side under bare fiber/cable load mode, carry out descrambling, receive and delimit, " go to fill " and handle, finishing the header error control HEC that receives grouping calculates, unified framing protocol Data Unit UFPDU of identification and cell, calculate packet checks sequence PCS, protocol Data Unit PPDU is filled in deletion, correct unified framing protocol Data Unit UFPDU and cell are carried out format conversion, deliver to respectively and receive packet/cell push-up storage FIFO, by business side interface transform format and output;
(8) expense interface, be used for the setting and the taking-up of complete operation management maintenance OAM relevant information, this interface sends processor, SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor, unified framing protocol Data Unit/cell (UFPDU/ATM Cell) transmission processor and unification framing protocol Data Unit/cell (UFPDU/ATM Cell) receiving processor with SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET and is connected;
(9) Microprocessor Interface is used for realizing being connected with external microprocessor, finishes the configuration and the state output of adaptive device.
It should be noted that on the empty branch road VT of SDH (Synchronous Digital Hierarchy) SDH virtual container VC and the Synchronous Optical Network SONET function identical, so the present invention also is applicable to Synchronous Optical Network SONET void branch road VT to the description of SDH (Synchronous Digital Hierarchy) SDH virtual container VC.
Above-mentioned adaptive device, wherein unified framing protocol Data Unit/cell UFPDU/ATM Cell sends processor and outputs to the protocol Data Unit PDU mixed flow that SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor or line side interface and have 4 kinds, promptly unified framing protocol Data Unit UFPDU, cell, filling protocol Data Unit PPDU and " distinctive mark F ".
Above-mentioned adaptive device, wherein SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor or the line side interface protocol Data Unit PDU mixed flow that outputs to unified framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor has 4 kinds, promptly unified framing protocol Data Unit UFPDU, cell, filling protocol Data Unit PPDU and " distinctive mark F ".
The present invention has following advantage:
(1) finishes elongated packet and fixed length cell in the single virtual container/empty branch road VC/VT of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or the mixed transport on bare fiber/cable, increase substantially efficiency of transmission;
(2) also can finish elongated packet or fixed length cell separately in the single virtual container/empty branch road VC/VT of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or the transmission on bare fiber/cable;
(3) when connection-oriented load mode, the elongated packet control header and the standard cell header of definition are compatible fully, have reduced the processing complexity in associated transport and the exchange;
(4) can determine whether to adopt packet checks sequence PCS so that error checking and correction protection, applied range to be provided according to the traffic performance of high level data grouping;
(5) provide the protocol type deixis of high level data grouping (as IPv4, IPv6);
(6) transmission for elongated packet provides priority, is convenient to switching equipment and adopts Differentiated Services, to improve the service quality QoS of real time business;
(7) provide high level data packet segmentation/refitting function that grouping may need;
(8) can be the high level data grouping provides the nothing that is similar to the Internet protocol IP network to connect data transport functions.
Description of drawings:
Fig. 1 is the elongated packet that proposes of the present invention and the theory diagram of fixed length cell mixing transfer approach.
Fig. 2 is a unified framing protocol Data Unit format chart proposed by the invention.
Fig. 3 is asynchronous transfer mode atm cell format figure proposed by the invention, that revise.
Fig. 4 is that High-Level Data Link Control HDLC flag of frame, elongated unified framing protocol Data Unit and fixed length cell mix the transmission schematic diagram.
Fig. 5 is that the mixing of elongated unified framing protocol Data Unit and the fixed length cell stream single virtual container VC that is mapped to SDH (Synchronous Digital Hierarchy) SDH transmits schematic diagram.
Fig. 6 is that elongated unified framing protocol Data Unit and fixed length cell mix the adaptation processing device when transmitting.
Fig. 7 is that the ethernet physical layer frame is formed format chart.
Fig. 8 is an Ethernet medium access control MAC frame format chart.
Fig. 9 is when transmitting Ethernet medium access control MAC frame, the unified framing protocol Data Unit UFPDU format chart of generation.
Figure 10 is an application implementation illustration of the present invention.
Embodiment:
Describe implementation method of the present invention and device in detail below in conjunction with accompanying drawing.
As shown in Figure 2, unified framing protocol Data Unit UFPDU proposed by the invention, comprise that unified framing agreement virtual connections identifier/unification framing protocol network node identifier UFPVCI/UFPNNI field, load type PT field, packet loss priority P LP field, header error control HEC field, packet checks sequence exist sign PCSE field, packet-priority territory PPF field, upper-layer protocol identifier ULPI field, final stage indication LSI, payload field, packet checks sequence PCS field, the implication of each field is as follows in its protocol Data Unit:
(1) unify framing agreement virtual connections identifier/unification framing protocol network node identifier UFPVCI/UFPNNI (28 bit), its effect is relevant logical identifier or the stepped zone network node address of the unified framing protocol Data Unit of sign UFPDU.
The UFPVCI/UFPNNI field has following two kinds of forms: first kind of form is the unified framing agreement of its expression virtual connections identifier UFPVCI, implication is similar to the Virtual Path Identifier/virtual path identifiers VPI/VCI in the cell, wherein Virtual Path Identifier VPI partly takies 8/12, difference respective user network interface/network node interface UNI/NNI, virtual path identifiers VCI partly takies 16, is distributed by signaling protocol; Second kind of form is the unified framing protocol network of its representative node identifier UFPNNI, and promptly the network node address is used to distinguish the heterogeneous networks node in the unified framing agreement UFP networking zone.Unified framing protocol network node identifier UFPNNI is totally 28 bits, place node in the unified framing agreement UFP territory that preceding 14 bits are represented to divide into groups, and back 14 bits are represented the endogenous node in unified framing agreement UFP territory of this grouping.The included subscriber endpoints address realm (as Internet protocol IP address) of different unified framing agreement UFP territory nodes is stipulated by network management protocol.Because this mode belongs to connectionless-mode, can not guarantee that grouping arrives according to the order of sequence; As guaranteeing that grouping arrives according to the order of sequence, can add sequence number by upper-layer protocol in the protocol Data Unit load zones.
(2) load type PT (3 bit), the load type of sign UFPDU.When unified framing protocol Data Unit UFPDU mixed transmission with cell, it was to unify framing protocol Data Unit UFPDU that load type PT=111B (2 system) identifies certain protocol Data Unit, and PT ≠ 111B to identify certain protocol Data Unit be cell Cell.
(3) packet loss priority P LP (1 bit): indicate the packet loss priority of unified framing protocol Data Unit UFPDU, the function of PLP, occupation mode are identical with Cell Loss Priority CLP in the cell.In unified framing protocol Data Unit UFPDU transport process,, can abandon the grouping of packet loss priority P LP=1 earlier if appearance is congested in the switching/routing node.
(4) there is sign PCSE (1 bit) in the packet checks sequence: whether unified framing protocol Data Unit UFPDU uses the sign of packet checks sequence PCS.PCSE=1/0 represents that respectively packet checks sequence PCS field exist/does not exist.
(5) packet-priority territory PPF (3 bit): the packet-priority that indicates unified framing protocol Data Unit UFPDU.PPF=000～111B sign load priority, 111 expression priority are the highest.
(6) upper-layer protocol identifier ULPI (3 bit): the high level data protocol type information of the unified framing protocol Data Unit of sign UFPDU load p ayload.The unified framing protocol Data Unit of upper-layer protocol identifier ULPI=0x04 sign UFPDU load is the IPv4 grouping, the unified framing protocol Data Unit of ULPI=0x06 sign UFPDU load is the IPv6 grouping, and the unified framing protocol Data Unit of ULPI=0x07 sign UFPDU load is peer-peer protocol PPP grouping.Other ULPI numerical value temporarily keeps.
(7) final stage indication LSI (1 bit): it is the intact part or the last part of some high-rise User Agreement data cells that final stage indication LSI=1 identifies certain load zones of unifying framing protocol Data Unit UFPDU, and LSI=0 identifies a beginning or a middle part that certain load zones of unifying framing protocol Data Unit UFPDU is some high-rise User Agreement data cells.
(8) header error control HEC (8 bit): the header error control adopt with the standard cell in the identical processing of header error control HEC, promptly adopt generator polynomial g (x)=x 8+ x 2+ x+1 is to header 4 byte information multinomial and x 8Multiplied result rems, and this remainder is put into this field through adding after 01010101B handles.
(9) load p ayload: load zones is deposited the part (user data packets) of complete protocol Data Unit of high-rise user or protocol Data Unit, or operation management maintain OAM grouping.
(10) packet checks sequence PCS (32 bit): be used for header, extension header, the data payload area (or extension header and data payload area) of unified framing protocol Data Unit UFPDU are carried out the error checking and correction protection, generator polynomial is g (x)=x 32+ x 26+ x 22+ x 16+ x 12+ x 11+ x 10+ x 8+ x 7+ x 5+ x 4+ x 2+ x+1.
The interior field of dashed rectangle that it should be noted that Fig. 2 is optional, header error control HEC, whole header extension field among the promptly unified framing protocol Data Unit UFPDU, be that the packet checks sequence exists sign PCSE, packet-priority territory PPF, upper-layer protocol identifier ULPI, final stage indication LSI, packet checks sequence PCS field, can select whether to use by network management.
As shown in Figure 3, asynchronous transfer mode ATM cell proposed by the invention, that revise, its load are the fixed length grouping.The implication of each field is identical with the implication of standard cell corresponding field in its protocol Data Unit, and difference is that the header error control HEC field (in the dashed rectangle) in its protocol Data Unit is selectable, promptly determines by network management whether it exists.
As shown in Figure 4, protocol Data Unit mixed flow of the present invention is made up of " distinctive mark F ", unified framing protocol Data Unit UFPDU, cell and filling protocol Data Unit PPDU, and the effect of wherein filling protocol Data Unit PPDU is a rate adapted." distinctive mark F " length is a byte (eight-digit binary number group), can distinguish the border between two adjacent protocol Data Units in the protocol Data Unit mixed flow, these protocol Data Units comprise unified framing protocol Data Unit UFPDU, cell and filling protocol Data Unit PPDU, two adjacent protocol Data Units both can belong to same kind (as a cell and a cell), also can belong to variety classes (as a unified framing protocol Data Unit UFPDU and a cell).When sending unified framing protocol Data Unit UFPDU, cell and filling protocol Data Unit PPDU, the sending order of byte is to begin from byte number 1, and the bit sending order in the byte is the highest the 7th to minimum the 0th from byte.
As shown in Figure 5, unified framing protocol Data Unit UFPDU of the present invention and cell be according to the service priority strategy, packs into successively or be mapped among the virtual container VC of SDH (Synchronous Digital Hierarchy) SDH, and the pointer adjustment is by the H among the section overhead SOH 1And H 2Byte provides.Because the beginning of cell and unified framing protocol Data Unit UFPDU changes in virtual container VC load zones, may only pack into the beginning part of a cell or unified framing protocol Data Unit UFPDU of the decline that notes a virtual container VC load zones, and packed into the beginning part of virtual container VC load zones of next SDH (Synchronous Digital Hierarchy) SDH frame of the remainder of same cell or unified framing protocol Data Unit UFPDU.
As shown in Figure 6, adaptive device of the present invention comprises: the business side interface, grouping/ATM cell Packet/ATM Cell push-up storage FIFO, unified framing protocol Data Unit/cell UFPDU/ATM Cell sends processor, SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor, the line side interface, SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor, unified framing protocol Data Unit/cell UFPDU/ATMCell receiving processor, the expense interface, Microprocessor Interface unit or module, but SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor and SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor only is used for SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, wherein:
The business side interface, the function of finishing comprises: (1) produces and the required control signal of identification services input/output interface, and on professional input/output interface transmission/reception data; (2) realize and send cell push-up storage FIFO, send grouping push-up storage FIFO, receive grouping push-up storage FIFO, receive grouping or cell transmission between four memories of cell push-up storage FIFO; (3) the protocol Data Unit PDU format conversion between the professional input/output interface of realization and above-mentioned four memories.
When transmitting Ethernet service, the protocol Data Unit that transmits in the professional input/output interface is an Ethernet physical frame as shown in Figure 7, the business side interface is converted to Ethernet medium access control MAC frame shown in Figure 8 with the Ethernet physical frame, outputs to send grouping push-up storage FIFO.Ethernet medium access control MAC frame is that the Ethernet physical frame is removed preamble and SFD two fields, and the payload of its residue field as unified framing protocol Data Unit UFPDU transmitted.The transmission interface type of professional input/output interface support comprises: (1) asynchronous transfer mode universal test and operation-interface UTOPIA, (2) be grouped in SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET and go up transmission PoS interface, (3) Media Independent Interface MII interface, (4) SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET interface of transmission cell, (5) the PDH (Pseudo-synchronous Digital Hierarchy) PDH interface of transmission cell or packet, the cell coffret of (6) atm forum definition.
Packet/cell Packet/ATM Cell push-up storage FIFO, comprise transmission cell push-up storage FIFO, transmission grouping push-up storage FIFO, receive grouping push-up storage FIFO, four kinds of memories of reception cell push-up storage FIFO, be used to deposit the variable-length packets and the cell of transmission and receive direction.
Unified framing protocol Data Unit/cell UFPDU/ATM Cell sends processor, finishes following function:
(1) produces the unified framing protocol Data Unit/cell of transmission
To carry out possible format conversion from sending the cell that cell ATM Cell push-up storage FIFO receives, promptly according to mixing decision is set whether adopts header error control HEC field of transfer system.
To be packaged into unified framing protocol Data Unit UFPDU from the variable-length packets that sends grouping Packet push-up storage FIFO reception.When variable-length packets was packaged into unified framing protocol Data Unit UFPDU, the mixing transfer equipment THE at network source point place added header, extension header, packet checks sequence to variable-length packets.
Unified framing agreement virtual connections identifier/unification framing protocol network node identifier UFPVCI/UFPNNI field is set in the header, makes load type PT=111B, packet loss priority P LP=0/1 is set according to grouping importance.Header error control HEC field is optionally, if but do not select packet checks sequence PCS (this moment, there was sign PCSE=0 in the packet checks sequence) for use, then header error control HEC field must be used, and its generator polynomial is g (x)=x 8+ x 2+ x+1, the transmit leg computational methods of header error control HEC are identical with the HEC computational methods of cell.
For the data that World Wide Web (WWW) WWW business need be carried out packet checks sequence PCS protection, the packet checks sequence is set has sign PCSE=1; Need not the data of packet checks sequence PCS error protection for ip voice VoIP, put the packet checks sequence and have sign PCSE=0.Service quality QoS characteristic according to business is provided with packet-priority territory PPF=000～111B.According to the agreement of high level data load, rational upper-layer protocol identifier ULPI value is set.Establish ULPI=0x04 when load is the IPv4 grouping, establish ULPI=0x06 when load is the IPv6 grouping, establish ULPI=0x07 when load is the PPP grouping.The use of other numerical value of ULPI can define in the specific implementation.
At the source network element place, if the length of protocol Data Unit to be sent greater than maximum transmission unit length M TU, then needs information to be sent is cut apart for length by [MTU deducts PDU control overhead length], form M data block (1,2,3,---, M, M are positive integer).When data chunk is dressed up unified framing protocol Data Unit UFPDU, to load loading data block (1,2,---, M-1) the unified framing protocol Data Unit UFPDU that forms, its final stage indication LSI=0 is set, and, its final stage indication LSI=1 is set the unified framing protocol Data Unit UFPDU that last data block M forms.
Load zones pack into a complete higher layer protocol data units PDU or a part wherein or operation management maintain OAM grouping.
Packet checks sequence PCS calculates the multinomial that uses and is g (x)=x 32+ x 26+ x 22+ x 16+ x 12+ x 11+ x 10+ x 8+ x 7+ x 5+ x 4+ x 2+ x+1.
When there was sign PCSE=1 in the packet checks sequence, the information field of packet checks sequence PCS protection depended on whether header error control HEC field exists.When header error control HEC field existed, the information field of packet checks sequence PCS protection was extension header and the payload field of unified framing protocol Data Unit UFPDU; When header error control HEC field did not exist, the information field of packet checks sequence PCS protection was header, extension header and the payload field of unified framing protocol Data Unit UFPDU.When there was sign PCSE=0 in the packet checks sequence, packet checks sequence PCS field did not exist.
The typical calculation method of transmit leg packet checks sequence PCS is: establish 32 remainder register initial values complete " 1 ", the message polynomial of supposing information field to be protected is m (x), calculates m (x) x 32The remainder of ÷ g (x) (mould ' 2 ' division), above-mentioned remainder finish with the 0xFFFFFFFF XOR after, put into packet checks sequence PCS field, highest order put into byte (N-3) the position 7, lowest order put into byte N the position 0.
When transmitting Ethernet medium access control MAC frame, unified framing protocol Data Unit/cell UFPDU/ATMCell sends processor, and too net medium access control MAC frame is as load, and the unified framing protocol Data Unit UFPDU that produces according to above-mentioned processing as shown in Figure 9.
(2) rate adapted
The effect of rate adapted is in the protocol Data Unit mixed flow of " distinctive mark F ", unified framing protocol Data Unit UFPDU, cell, add and fill protocol Data Unit PPDU, to guarantee to send to the above-mentioned protocol Data Unit and the speed sum of filling protocol Data Unit PPDU of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET processor or line side interface, equal the virtual container VC net rate of SDH (Synchronous Digital Hierarchy) SDH, or bare fiber/cable physical circuit transmission rate, for example, to Synchronous Transport Module level-N STM-1, this speed is 149.76Mbps.The principle of rate adapted is: preferentially send cell.When not having cell to send, just send priority unified framing protocol Data Unit UFPDU from high to low successively.If both there be not cell, also unified framing protocol Data Unit UFPDU etc. is to be sent, and be used for the filling protocol Data Unit PPDU of rate adapted with transmission this moment, and it has following form:
Operation management maintain OAM when 1) filling PDU form 1 is used for the networking of unification framing agreement, this filling PDU comprises unified framing protocol Data Unit UFPDU header and the load zones of Fig. 2, unified framing protocol Data Unit UFPDU with specific unified framing agreement virtual connections identifier/unification framing protocol network node identifier UFPVCI/UFPNNI sign virtual path level F4, virtual path level F5, header error control HEC is indispensable, and the load zones content is identical with the load of the operation management maintain OAM of asynchronous transfer mode ATM;
2) filling PDU form 2 is operation management maintain oam cells of the asynchronous transfer mode ATM of Fig. 3 form, and PDU is identical with the operation management maintain oam cell of the asynchronous transfer mode ATM of standard in this filling;
3) fill PDU form 3 and be made up of " distinctive mark F ", spcial character 0xdd (being programmed for other value) and " distinctive mark F " these 38 binary system groups, this form is applicable to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or bare fiber/cable transmission circuit occupancy condition with higher;
4) fill the PDU format 4 and comprise that Fig. 2 unifies the header of framing protocol Data Unit UFPDU, this moment, header error control HEC was indispensable.Header 5 bytes of unified framing protocol Data Unit UFPDU are (0x0,0x0,0x0,0x1, effective values of header error control HEC), do not have extension header, load zones and packet checks sequence PCS field;
5) filling PDU form 5 is asynchronous transfer mode ATM idle cells, and its header 5 bytes are (0x0,0x0,0x0,0x1, effective values of header error control HEC), and payload field is placed " 01101010 " of 48 bytes.
The transmission bandwidth of operation management maintain OAM Protocol Data Unit is depended in the transmission of filling PDU form 1 and form 2, when not sending filling PDU form 1 and form 2, filling the preferred sending order of PDU is to fill PDU form 3, filling PDU format 4, filling PDU form 5.
(3) transparency is handled
The transparency is finished dealing with and is sent processing method when " distinctive mark F " occurring among the PDU, and " distinctive mark F " refers to be used for the sign of boundary alignment between different PDU herein, uses 0x7e, other value that is set to also able to programme.
Transmit leg will send " the distinctive mark F " that occur among the protocol Data Unit PDU and be replaced into two bytes, one is " 8 binary system groups of escape ", and another is the numerical value after " distinctive mark F " and " filling special mask " (8 binary system groups) are carried out distance.Also carry out above-mentioned processing to sending 8 the binary system groups of escape that occur among the PDU.8 binary system groups of escape and the equal available software of the special mask of filling change setting, and default value is respectively 0x7d and 0x20.As an example, the transparent processing conversion is as follows:
1) 0x7e is replaced into 0x7d, 0x5e
2) 0x7d is replaced into 0x7d, 0x5d
(4) scrambling
Unified framing protocol Data Unit/cell UFPDU/ATM Cell sends processor can be to the mixed flow scrambling of " distinctive mark F ", unified framing protocol Data Unit UFPDU, cell and filling protocol Data Unit PPDU, and it is x that multinomial is adopted in scrambling 43+ 1 self-synchronous scrambler.Scrambling is made as " 1 " entirely with the scrambler initial value before calculating beginning.
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor, finishes following function:
(1) unifies framing protocol Data Unit/cell UFPDU/ATM Cell mapping
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor will unify " distinctive mark F ", unified framing protocol Data Unit UFPDU, cell and the filling protocol Data Unit PPDU mixed flow that framing protocol Data Unit/cell UFPDU/ATM Cell sends the processor input, by pack into the virtual container VC of SDH (Synchronous Digital Hierarchy) SDH of Fig. 5 mode.Note that this mapping generally carries out in higher order virtual container VC, also can carry out, but the multiplexing efficient height among the higher order virtual container VC more can embody advantage of the present invention according to being configured among the Lower Order Virtual Container VC.For example when adopting virtual container VC-12 mapping, a Synchronous Transport Module level-N STM-1 only comprises 63 virtual container VC-12, and its maximum transmitted efficient is 63*2.048/149.76=86%.When adopting virtual container VC-4 mapping, a Synchronous Transport Module level-N STM-1 comprises 1 virtual container VC-4, and its maximum transmitted efficient is 149.76/149.76=100%.
According to the principle of Administrative Unit Pointer AU-PTR, the H among Administrative Unit Pointer AU-PTR 1And H 2) byte can point out the original position of virtual container VC, H among the path overhead POH 4Be used to indicate the position of the head of first complete protocol Data Unit PDU at current SDH (Synchronous Digital Hierarchy) SDH frame virtual container VC.
(2) overhead byte produces and handles
Produce the frame delimiter byte (A of SDH (Synchronous Digital Hierarchy) SDH frame 1, A 2).Track data communication channel (D is inserted in selection able to programme 1～D 12).
All bit streams after the scrambling of previous SDH (Synchronous Digital Hierarchy) SDH frame are calculated byte-interleaved verification BIP, and BIP-8 adopts even parity check, and its result puts into the B1 byte.With previous SDH (Synchronous Digital Hierarchy) SDH frame all bit streams except the 1st～3 row of section overhead SOH, carry out byte-interleaved verification BIP-96 even parity check and calculate, the result puts into byte B2.SDH payload envelope SPE to previous SDH (Synchronous Digital Hierarchy) SDH frame calculates BIP-8, and BIP-8 adopts even parity check, and its result puts into the B3 byte.
According to related specifications monitoring channel transmission performance, with monitoring result G 1Byte sends the other end to.Insert automatic protection switching APS channel byte (K according to related specifications 1, K 2).
(3) scrambling
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET sends processor and can use frame synchronizer to the transmission frame sts-stream scrambling sts, and the multinomial of use is g (x)=x 7+ x 6+ 1, SDH (Synchronous Digital Hierarchy) SDH frame control byte (A 1, A 2), J 0And Z 0Not scrambling.
The line side interface
At sending direction, the line side interface is according to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or bare fiber/cable load mode, to send the byte data of processor or unified framing protocol Data Unit/cell UFPDU/ATM Cell transmission processor reception from SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET, finish parallel/serial conversion, send to (TXD on the circuit with differential mode +, TXD -).G.707 the data tranmitting data register should satisfy and Bellcore GR-253-CORE standard, to the 155.52MHz/622.08MHz precision is ± 20ppm.
On receive direction, the differential data (RXD of line side interface from receiving +, RXD -) in recovered clock or directly import the receive clock reference, and from (RXD +, RXD -) in recover data, finish serial/parallel conversion, give SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor or unified framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor.Whether detection signal is lost LOS and is taken place, and then provides indication by the expense interface if take place.
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor, finish following function:
(1) receiver section is handled
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor can take out the section data communication channel (D among the section overhead SOH 1～D 4), and according to (A 1, A 2) byte finishes SDH (Synchronous Digital Hierarchy) SDH frame and delimit.In continuous 4 frames,, can provide OOF signal LOF if delimit mistake.
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor carries out descrambling to receiving stream, whether adopts descrambling setting able to programme.The descrambling multinomial is g (x)=x 7+ x 6+ 1, SDH (Synchronous Digital Hierarchy) SDH frame control byte (A 1, A 2), J 0And Z 0Do not participate in descrambling.
(2) receive overhead processing
But SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor detection line far-end worsens indication RDI and whether alarm indication signal AIS takes place, if indication takes place then to provide.SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor is desirable to go out track data channel (D 4～D 12), export by the expense interface.Can detect BIP-8 mistake and BIP-96 mistake according to byte-interleaved parity check BIP principle, provide corresponding wrong indication by the expense interface.
(3) reception pointer is handled
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor is realized the correct interpretation of pointer, and the net load among the virtual container VC is taken out, and gives unified framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor and handles.If the generation null pointer provides the indication respective pointer by the expense interface and loses the LOP mistake.
Unified framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor, finish following function:
(1) descrambling
Unified framing protocol Data Unit/cell UFPDU/ATM Cell receiving processor receives data mixing stream with byte mode from SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET receiving processor or line side interface, can import the mixed flow descrambling to this, this mixed flow comprises " distinctive mark F ", unified framing protocol Data Unit UFPDU, cell and filling protocol Data Unit PPDU.It is x that descrambling adopts multinomial 43+ 1 motor synchronizing descrambler.Descrambling is made as " 1 " entirely with the scrambler initial value before calculating beginning.
(2) receiving demarcation handles with " going to fill "
Search " distinctive mark F " in (behind the descrambling) data word throttling that receives, carry out byte and " go to fill " processing, the filling PDU (fill with PDU form 3) and the aborted of deletion rate adapted are divided into groups, the identification that the data between two after the above-mentioned processing " distinctive mark F " are unified framing protocol Data Unit and cell as a PDU.The aborted grouping refers to that two byte numbers between " distinctive mark F " are less than 5.
" go fill " the opposite processing when sending of finishing dealing with is about to following 2 special 8 binary system groups and is transformed to 8 binary system group: 0x7d, and 0x5e is replaced into 0x7e, 0x7d, and 0x5d is replaced into 0x7d.
(3) unified framing protocol Data Unit of identification and cell
When transmit leg is unified header error control HEC field in framing protocol Data Unit UFPDU or the cell and is existed, according to g (x)=x 8+ x 2+ x+1 carries out cyclic redundancy check (CRC)-8 to preceding 4 joint bytes and calculates, and the gained result adds 01010101, and compares with the 5th byte that receives, if correct, then this protocol Data Unit PDU is carried out subsequent treatment as correct PDU; Otherwise correct the individual bit mistake in preceding 4 bytes.As multi-bit errors takes place, then abandon this protocol Data Unit PDU.
In the protocol Data Unit PDU that receives, if load type PT field ≠ 111B, and do not exist in header error control HEC field/length when existing is 52/53, judges that then this protocol Data Unit PDU is a cell.Abandon the protocol Data Unit PDU that satisfies load type PT field ≠ 111B and length ≠ 52/53.
In the protocol Data Unit PDU that receives, if load type PT=111B judges that then this protocol Data Unit PDU is unified framing protocol Data Unit UFPDU; If there are sign PCSE=1 in load type PT=111B and packet checks sequence, then packet checks sequence PCS field exists, and needs that protocol Data Unit PDU is carried out cyclic redundancy check (CRC)-32 and handles.
(4) receiving packet checks sequence PCS calculates
The typical method of recipient's calculating cyclic redundancy check (CRC)-32 is: establish remainder register initial value complete " 1 ", the field information field multinomial to be protected of establishing reception is m (x) ',, then calculate m (x) ' x with the serial or parallel look-up table earlier 32The remainder of ÷ g (x).With gained remainder result and 0xFFFFFFFF distance (mould 2 adds), whether result who obtains and the packet checks sequence PCS in the received frame are relatively, wrong with definite protocol Data Unit PDU.When mistake, the mistake that can correct is corrected, otherwise abandon this protocol Data Unit PDU.
(5) receive protocol Data Unit PDU storage
After judging that a protocol Data Unit PDU is unified framing protocol Data Unit UFPDU or cell, carry out protocol Data Unit PDU format conversion earlier, it is put into respectively receive packet/cell Rx Packet/ATM Cell push-up storage FIFO again.
The expense interface is used for the unified framing protocol Data Unit UFPDU of operation management maintain OAM and the setting and the taking-up of asynchronous transfer mode ATM cell associative operation maintenance management information.When SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET load mode, also finish the setting that can select control byte among sending direction section overhead SOH, the path overhead POH, realize the taking-up of control byte among receive direction section overhead SOH, the path overhead POH.
Microprocessor Interface, the main realization and the interface of external microprocessor comprises mode of operation setting, the test of adaptive device, status register, the state output of adaptive device also comprises relevant control logic.
As shown in figure 10, the present invention can be used for the point-to-point transmission and puts multiple spot or the network transmission.In Figure 10 (a), mix the network interface NI of transfer equipment HTE by standard, receive variable-length packets (as the Ethernet frame) and fixed length cell from these network componentses of switch, router, server and the network terminal, these network interfaces comprise Media Independent Interface MII, asynchronous transfer mode universal test and operation-interface UTOPIA.Mix transfer equipment HTE variable-length packets and the fixed length cell that receives is packaged into protocol Data Unit PDUs by the given form of the present invention respectively, and the protocol Data Unit PDUs of two kinds of forms mixed on same virtual container/empty branch road VC/VT of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or bare fiber/cable transmit.The recipient mixes transfer equipment THE two kinds of protocol Data Unit PDUs that receive is finished identification and separate, again two kinds of protocol Data Unit PDUs are sealed off dress, finish protocol Data Unit PDU format conversion, by network interface with elongated packet and fixed length cell, be submitted to the switch network parts, or the form when submitting with source-end networks parts NE is sent among the end network components NE of place.In Figure 10 (b), the elongated packet/fixed length cell transport process among the sourcesink network components NE and Figure 10 (a) basically identical, difference is that the network node (mixing transfer equipment HTE/ switch SW) among Figure 10 (b) has function of exchange.Certain network of supposition has 6 network nodes in Figure 10 (b), and numbering is respectively N1～N6.Source network element NE carries out format conversion with the elongated packet/fixed length cell of its reception, sends the N1 node to.Two kinds of PDUs that the mixing transfer equipment HTE of N1 node will receive finish identification and separate, and send elongated packet and fixed length cell to switch by standard interface again and finish exchange.Cell is carried out the Virtual Channel/virtual path VP/VC exchange of standard, and cell is delivered to port 2 or the port 3 of N1 respectively.Exchange to elongated packet has two kinds of forms, a kind of is that unified framing agreement virtual connections identifier/unification framing protocol network node identifier UFPVCI/UFPNNI adopts unified framing agreement virtual connections identifier UFPVCI, this moment, the switch SW of N1 node finished corresponding VP/VC exchange, but the exchange elementary cell is elongated protocol Data Unit PDU.Another kind is that UFPVCI/UFPNNI adopts unified framing protocol network node identifier UFPNNI, and this moment, the switch SW of N1 node needed to determine port that outputs to N1 2 or the port 3 of this protocol Data Unit PDU according to routing algorithm.Mixing transfer equipment THE among the N1 is with a certain port (1,2,3) in etc. elongated packet/fixed length cell to be sent carry out format conversion, form the cell of unified framing protocol Data Unit UFPDU or modification, two kinds of protocol Data Unit PDU are sent by SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network SDH/SONET or bare fiber/cable transmission circuit.The unified framing protocol Data Unit UFPDU that mixing transfer equipment HTE among the N2 will receive from the N1 node or two kinds of PDUs of cell of modification finish identification and separate, and give switch SW by standard interface with elongated packet and cell again and exchange.Other subsequent treatment of N2 node is identical with the N1 node.The processing of network others node is also identical with the N1 node.The unified framing protocol Data Unit UFPDU that mixing transfer equipment HTE among the Su Duandian will receive from the N6 node or two kinds of PDUs of cell of modification finish identification and separate, again by standard interface such as asynchronous transfer mode universal test and operation-interface UTOPIA, give network components NE with elongated packet and cell and carry out subsequent treatment.

Claims (8)

1. an elongated packet mixes the method that transmits with fixed length cell, comprises the transmission processing that sends and receive both direction, wherein:
Sending direction is undertaken by following process:
(1) Media Independent Interface (MII), asynchronous transfer mode universal test and operation-interface (UTOPIA) interface of use standard, receive elongated Frame and fixed length cell from user terminal, transmission equipment and switch network parts, with the payload segment in the elongated Frame, it is elongated packet, deposit in and send grouping push-up storage (FIFO), and cell is directly put into transmission cell push-up storage (FIFO);
(2) the elongated packet that will send in the grouping push-up storage (FIFO) is taken out, and adds control header and extension header and packet checks sequence (PCS), is packaged into unified framing protocol Data Unit (UFPDU); The fixed length cell that will send simultaneously in the cell push-up storage (FIFO) takes out and is transformed into the cell format of modification;
(3) between unified framing protocol Data Unit (UFPDU) and cell, add " distinctive mark (F) " that distinguishes both borders, with border between difference different agreement data cell (PDU), and, will unify framing protocol Data Unit (UFPDU) and the cell revised mixes according to service quality (QoS) characteristic of customer service;
(4) in the mixed flow of " distinctive mark (F) " and unified framing protocol Data Unit (UFPDU) and cell composition, add filling protocol Data Unit (PPDU), guarantee that this speed sum equals the net rate of the virtual container of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET)/empty branch road (VC/VT) or bare fiber/cable line, to realize rate adapted;
(5) unified framing protocol Data Unit (UFPDU), cell and filling protocol Data Unit (PPDU) being carried out the transparency handles, promptly in the unified framing protocol Data Unit (UFPDU), cell and filling protocol Data Unit (PPDU) the three kinds of protocol Data Units (PDU) that send, " distinctive mark (F) " of appearance handles;
(6) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) load mode, mixed flow with " distinctive mark (F) ", unified framing protocol Data Unit (UFPDU), cell, filling protocol Data Unit (PPDU) composition, pack into or be mapped to virtual container/empty branch road (VC/VT) of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET), and to the net load in virtual container/empty branch road (VC/VT), the employing multinomial is x 43+ 1 self-synchronous scrambler carries out scrambling; When bare fiber/cable load mode, only above-mentioned mixed flow being adopted multinomial is x 43+ 1 self-synchronous scrambler carries out scrambling;
(7) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) load mode, the section overhead (SOH) and the path overhead (POH) that net load after the scrambling are added SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) frame, form SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) transmit frame, and this transmit frame is adopted multinomial g (x)=x 7+ x 6+ 1 carries out scrambling;
(8) to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) transmit frame, or the byte of the above-mentioned mixed flow during bare fiber/cable load mode is carried out the bit conversion, and use tranmitting data register to produce the difference outputting data signals, by driving, output on the circuit this outputting data signals;
Receive direction is undertaken by following process:
Mixed flow when (1) receiving SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) transmit frame or bare fiber/cable load mode, recovered clock and data or direct input clock are transformed to byte with data bit from the differential data of input;
(2) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) load mode, according to (the A of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) frame 1, A 2) byte is carried out the frame demarcation, and employing descrambling multinomial g (x)=x 7+ x 6+ 1 carries out descrambling;
(3) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) load mode, take out and handle the section overhead (SOH) and the path overhead (POH) of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) frame, whether the detection line far-end worsens indication (RDI), alarm indication signal (AIS), byte-interleaved parity check BIP-8 or BIP-96 mistake takes place, and provides corresponding wrong indication;
(4) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) load mode,, take out the net load in virtual container/empty branch road (VC/VT) according to the pointer indication in the control expense;
(5) when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) load mode, if multinomial x is then adopted in the net load scrambling in transmit leg virtual container/empty branch road (VC/VT) 43+ 1 carries out the motor synchronizing descrambling; When bare fiber/cable load mode, the data byte of scrambling is adopted multinomial x 43+ 1 carries out descrambling;
(6) search " distinctive mark (F) " in the byte stream that receives, and carry out byte and " go to fill " processing, PPDU form 3 in the filling protocol Data Unit (PPDU) of identification and deletion rate adapted and aborted grouping are carried out subsequent treatment with the data between two " distinctive mark (F) " as a protocol Data Unit (PDU);
(7) unify header error control (HEC) in framing protocol Data Unit (UFPDU) or the cell when field exists when transmit leg, I.361 finish the error control of protocol Data Unit (PDU) header handles according to the ITU of International Telecommunication Association, the protocol Data Unit (PDU) correct to header error control (HEC) carries out subsequent treatment, still incorrect protocol Data Unit (PDU) after abandoning header error control (HEC) and handling;
(8) in the correct protocol Data Unit (PDU) of the header error control (HEC) that receives, unified framing protocol Data Unit (UFPDU) of identification and cell, if load type (PT) field ≠ 111B and length are 52/53, judge that then this protocol Data Unit (PDU) is a cell, if load type (PT)=111B, judge that then this protocol Data Unit (PDU) is unified framing protocol Data Unit (UFPDU), when the packet checks sequence (PCS) of unified framing protocol Data Unit (UFPDU) when existing, again it is carried out cyclic redundancy check (CRC) (CRC-32) and handle;
(9) handle filling protocol Data Unit (PPDU), to unify the load of framing protocol Data Unit (UFPDU) takes out, put into and receive grouping push-up storage (FIFO), and cell carried out protocol Data Unit (PDU) format conversion, this protocol Data Unit (PDU) is put into received cell push-up storage (FIFO) again;
(10) according to the call format of transport protocol data unit (PDU) on Media Independent Interface (MII), asynchronous transfer mode universal test and operation-interface (UTOPIA) interface of standard, take out to receive grouping and cell in the packet/cell push-up storage (FIFO), send to these network componentses of user terminal, transmission equipment and switch after finishing format conversion.
2. method according to claim 1 is characterized in that unifying framing protocol Data Unit (UFPDU) and is made up of control header, extension header, elongated packet and packet checks sequence (PCS) field successively.
3. method according to claim 1, it is characterized in that rate adapted divides three kinds of situations to send, promptly one is directly to send cell, the 2nd, when not sending cell, according to priority send unified framing protocol Data Unit (UFPDU) from high to low successively, the 3rd, if in the unit that neither posts a letter, when also not sending out framing protocol Data Unit (UFPDU) unified, send the filling protocol Data Unit (PPDU) of different-format.
4. method according to claim 1 is characterized in that being made up of following field the unified framing protocol Data Unit (UFPDU) that variable-length packets is packaged into:
(1) unify framing agreement virtual connections identifier/unification framing protocol network node identifier (UFPVCI/UFPNNI) field, this field is used to represent the logic virtual connections sign or the stepped zone network node address of unified framing protocol Data Unit (UFPDU); When the unified framing agreement virtual connections identifier of expression (UFPVCI), its implication is similar to the Virtual Path Identifier/virtual path identifiers (VPI/VCI) in asynchronous transfer mode (ATM) cell, is distributed by signaling protocol; When expression network node address, be used to distinguish the heterogeneous networks node in the unified framing agreement networking zone;
(2) load type (PT) field, this field is used for distinguishing the unified framing protocol Data Unit (UFPDU) and the fixed length cell of unified framing protocol Data Unit (UFPDU) and fixed length cell mixed flow;
(3) packet loss priority (PLP) field, this field is used for identifying the packet loss priority of unified framing protocol Data Unit (UFPDU), in the grouping transport process, if appearance is congested in the switching/routing node, can abandon the grouping of PLP=1 earlier;
(4) header error control (HEC) field, this field adopts the identical processing of header error control (HEC) with the standard cell, is used for the correctness of guarantee agreement data cell (PDU) header;
(5) there is sign (PCSE) field in the packet checks sequence, and whether this field represents to use packet checks sequence (PCS) that the relevant field of unified framing protocol Data Unit (UFPDU) is carried out error control;
(6) packet-priority territory (PPF) field, this field is used to identify the load packet-priority of unified framing protocol Data Unit (UFPDU), is used for network switch/routing node this protocol Data Unit (PDU) is carried out different processing;
(7) upper-layer protocol identifier (ULPI) field, this field is used for identifying the high level data protocol type information of unified framing protocol Data Unit (UFPDU) load;
(8) final stage indication (LSI) field, this field is used to identify a beginning or the middle part that certain load zones of unifying framing protocol Data Unit (UFPDU) is some high-rise User Agreement data cells (PDU), still is the intact part or the last part of some high-rise User Agreement data cells (PDU);
(9) load (Payload) field, this field is used to deposit the part of complete protocol Data Unit of high-rise user (PDU) or protocol Data Unit (PDU), or operation management maintain (OAM) grouping;
(10) packet checks sequence (PCS) field, this field are used for header, extension header, the data payload area of unified framing protocol Data Unit (UFPDU) are carried out the error checking and correction protection, and generator polynomial is g (x)=x 32+ x 26+ x 22+ x 16+ x 12+ x 11+ x 10+ x 8+ x 7+ x 5+ x 4+ x 2+ x+1.
5. according to claim 1 or 3 described methods, it is characterized in that filling protocol Data Unit (PPDU) has following five kinds of forms:
(1) fills protocol Data Unit form 1, operation management maintain (OAM) when being used for the networking of unification framing agreement, this filling protocol Data Unit comprises the header and the load zones of unified framing protocol Data Unit (UFPDU), and the load zones content is identical with the load of the operation management maintain (OAM) of asynchronous transfer mode (ATM);
(2) filling protocol Data Unit form 2, is operation management maintain (OAM) cell of asynchronous transfer mode (ATM), and the filling protocol Data Unit is identical with operation management maintain (OAM) cell of the asynchronous transfer mode (ATM) of standard;
(3) fill protocol Data Unit form 3, be made up of " distinctive mark (F) ", spcial character 0xdd and " distinctive mark (F) " three 8 binary system groups, this form is applicable to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) or bare fiber/cable transmission circuit occupancy condition with higher;
(4) fill the protocol Data Unit format 4, comprise the header of unified framing protocol Data Unit (UFPDU), do not have extension header, load zones and packet checks sequence (PCS) field;
(5) filling protocol Data Unit form 5, is asynchronous transfer mode (ATM) idle cell of standard.
6. an elongated packet mixes the adaptive device that transmits with fixed length cell, comprises the following function module:
The business side interface is used for transmission/receiving data frames and cell, realizes that packet/cell transmits and transmit control, protocol Data Unit (PDU) format conversion, and this interface is connected with professional input/output interface, packet/cell push-up storage (FIFO);
Packet/cell push-up storage (FIFO), mainly form by transmission/reception grouping push-up storage (FIFO) and transmission/reception cell push-up storage (FIFO), be used to deposit the grouping and the cell of transmission and receive direction, this memory sends with business side interface, unified framing protocol Data Unit/cell (UFPDU/ATM Cell) or receiving processor is connected;
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) sends processor, be used for when SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) load mode, to unify protocol Data Unit (PDU) mixed flow that framing protocol Data Unit/cell (UFPDU/ATM Cell) sends the processor input, be mapped to virtual container/empty branch road (VC/VT) of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET), and generation section overhead (SOH) and path overhead (POH), assembling SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) frame is to delivering to the line side interface after this frame scrambling;
The line side interface, be used for SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) is sent processor, or unified framing protocol Data Unit/cell (UFPDU/ATM Cell) sends the input data of processor, carry out parallel/serial exchange, produce tranmitting data register and differential data signals, data-signal is outputed on the circuit; From the physical circuit receiving input data signal, finishing recovery of receive clock signal and data recovers, the serial/parallel conversion of the line data of going forward side by side, according to two kinds of different load modes of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) and bare fiber/cable, send data after the conversion to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) receiving processor, or unified framing protocol Data Unit/cell (UFPDU/ATM Cell) receiving processor;
SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) receiving processor, the data search that is used for the line side interface is imported is to determine the original position of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) frame, and to the receiving data frames descrambling, take out section overhead (SOH) and path overhead (POH) in this frame, determine the original position of virtual container/empty branch road (VC/VT) original position and first complete protocol Data Unit (PDU) of load zones according to pointer mechanism, again data in the frame are delivered to unified framing protocol Data Unit/cell (UFPDU/ATM Cell) receiving processor;
The expense interface, be used for the setting and the taking-up of complete operation management maintenance (OAM) relevant information, this interface sends processor, SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) receiving processor, unified framing protocol Data Unit/cell (UFPDU/ATM Cell) transmission processor and unification framing protocol Data Unit/cell (UFPDU/ATM Cell) receiving processor with SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) and is connected;
Microprocessor Interface is used to realize be connected with all the other functional modules of external microprocessor, adaptive device, finishes the configuration and the state output of adaptive device;
It is characterized in that also comprising:
Unified framing protocol Data Unit/cell (UFPDU/ATM Cell) sends processor, be used to finish the cell that grouping and cell with packet/cell push-up storage (FIFO) input are packaged into unified framing protocol Data Unit (UFPDU) and modification respectively, the cell that mixes unified framing protocol Data Unit (UFPDU) and revise, add and fill protocol Data Unit (PPDU) to realize rate adapted, and the net load in prepare to pack into virtual container/empty branch road (VC/VT) or the bare fiber/cable transmission circuit carried out transparency processing and scrambling, the output of this transmission processor is connected to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) and sends processor, or is connected to the line side interface in bare fiber/cable load mode;
Unified framing protocol Data Unit/cell (UFPDU/ATM Cell) receiving processor, be used for virtual container/empty branch road (VC/VT) net load district data to the input of SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) receiving processor, or the data of line side interface input when bare fiber/cable load mode, carry out descrambling, receive and delimit and " going to fill " processing, finishing the header error control (HEC) that receives grouping calculates, unified framing protocol Data Unit (UFPDU) of identification and cell, calculate packet checks sequence (PCS), protocol Data Unit (PPDU) is filled in deletion, correct unified framing protocol Data Unit (UFPDU) and cell are carried out format conversion, output to respectively and receive packet/cell push-up storage (FIFO), output to network components by business side interface transform format again.
7. adaptive device according to claim 6, it is characterized in that unified framing protocol Data Unit/cell (UFPDU/ATM Cell) sends processor and outputs to SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) transmission processor, or when bare fiber/cable load mode, output to the mixed flow of line side interface, form by unified framing protocol Data Unit (UFPDU), cell, filling protocol Data Unit (PPDU) and " distinctive mark (F) " four kinds of protocol Data Units (PDU).
8. adaptive device according to claim 6, it is characterized in that SDH (Synchronous Digital Hierarchy)/Synchronous Optical Network (SDH/SONET) receiving processor, or the line side interface outputs to the mixed flow of unified framing protocol Data Unit/cell (UFPDU/ATM Cell) receiving processor during bare fiber/cable load mode, is made up of unified framing protocol Data Unit (UFPDU), cell, filling protocol Data Unit (PPDU) and " distinctive mark (F) " four kinds of protocol Data Units (PDU).
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