CN103957094B - Data block synchrotron and rapid data block synchronization method - Google Patents

Data block synchrotron and rapid data block synchronization method Download PDF

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CN103957094B
CN103957094B CN201410201789.7A CN201410201789A CN103957094B CN 103957094 B CN103957094 B CN 103957094B CN 201410201789 A CN201410201789 A CN 201410201789A CN 103957094 B CN103957094 B CN 103957094B
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synchrotron
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CN103957094A (en
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乌力吉
白杰
牛赟
张向民
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Shenzhen Research Institute Tsinghua University
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Shenzhen Research Institute Tsinghua University
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Abstract

A kind of data block synchrotron, it is applied in the network equipment, the data block synchrotron is often taken turns acceleration and reads in m 66 data of group, whether it is synchronous head to 66 Data Detection of per group of reading per adjacent two, to 66 data accumulation testing results of m groups, so as to quickly determine synchronous head position, detection efficiency is improve, shorten the data block synchronous time.

Description

Data block synchrotron and rapid data block synchronization method
Technical field
The present invention relates to a kind of data block synchrotron and 10G Ethernet Physical Coding Sublayer expedited data units synchronization side Method.
Background technology
As high speed development and the popularization of Internet technology, data exchange requirement at a high speed, inexpensive are more and more urgent, hold The continuous innovation for promoting network technology.Ethernet technology is the most widely used local area network technology at present, can be simple, economical Ground builds the network of various speed.From 10Mbps standard ethernets, 100Mbps Fast Ethernets, 1000Mbps gigabit Ethernets, Arrive 10Gbps, 40Gbps even 100Gbps ultrahigh speed Ethernets again, maintain while ethernet technology quickly updates good Good inheritance.
IEEE formally passed through the 10Gbps ethernet technologys of 802.3ae standards in 2002.10G Fast Ethernets can be with Meet high-transmission bandwidth demand, and compatible with ethernet technology before, and do not transmitted due to the mode of operation of its full duplex The restriction of distance.Therefore, 10G ethernet technologys are widely used among LAN, Metropolitan Area Network (MAN) and wide area network, work for framework High speed and infallible data network of the speed for 10Gbps.At present, 10G ethernet technologys have been widely used for convergence-level and backbone Among layer network.
10G ethernet technology standards are determined by IEEE802.3ae.10G Ethernets be the standard specifies in seven layer networks of OSI The implementation method of the media access control sublayer of physical layer and data link layer in model.
Physical Coding Sublayer (PCS) be located at physical layer upper strata, be connected with the media access control sublayer of data link layer upwards, downwards with Physical medium attachment sublayer (PMA) connects.Different according to interface and application scenarios, 10G Ethernets PCS point is three kinds of realization sides Formula, LAN 10G BASE-X, 10G BASE-R and wide area network 10G BASE-W.Wherein 10G BASE-X interfaces are multiple using multichannel With technology, collect 4 road 3.125Gbps and form single channel 10Gbps.Other two kinds adopt single channel 10.3125Gbp fiber-optic transfer, are mesh Front application mainstream.10G BASE-W are that insertion Wide Area Network interface sublayer is expanded on the basis of 10G BASE-R.Therefore 10G BASE-R PCS are key modules in 10G Ethernets.
10G BASE-R PCS point is transmitter and receiver.Transmitter is by 64 XGMII form numbers from media access control sublayer According to being encoded into 66, then through scrambler, form transmission code and give physical layer bottom.During reception, lock unit aligns first 66 transmission codes for receiving, that is, complete data block synchronization, then forms 64 of XGMII forms through 64B/66B descrambling procedures Data.The characteristics of data block synchronizing process has 01 upset using low two perseverances of 66 transmission codes is realized.The feature is compiled by 64B/66B Code, scrambler mechanism ensure.
Existing 10G BASE-R PCS normal datas block synchronization method only detects certain phase in 66 data of reading every time Whether adjacent two be synchronous head, and detection efficiency is relatively low, and the time used by data block is synchronous is longer.
Content of the invention
In view of the foregoing, it is necessary to provide a kind of data block synchrotron and using the data block synchrotron reality Existing 10G Ethernet Physical Coding Sublayer rapid data block synchronization methods, can effectively improve the synchronous speed of data block.
A kind of data block synchrotron, is applied in the network equipment, and the data block synchrotron is often taken turns acceleration and reads in m 66 data of group, are designated as RX successively0、RX1、…、RXm-1, often read in one group of 66 data RXkAfter (k=0,1,2 ..., m-1), number According to block synchrotron to 66 data RXkEvery adjacent two do XOR, obtain RXk66 testing results TAG_ TEMk, i.e. TAG_TEMk[i]=RXk[i]^RXk[i+1], i=0,1,2 ..., 65, ^ represent XOR, and accumulative epicycle adds 66 testing results TAG of speedk=TAG_TEM0&TAG_TEM1&…&TAG_TEMk, wherein & is represented and computing, in reading m After 66 data of group, data block synchrotron determines 66 testing results TAG that epicycle acceleratesm-1In nearest from low order end For 1 position n, so as to maximum probability locking synchronization head position.
The 10G Ethernet Physical Coding Sublayer expedited data units synchronization side that a kind of utilization data block synchrotron is realized Method, the method include:
First step, under LOCK_INT states, puts block_lock=0, represents that now data block is asynchronous, puts test_ Sh=0, represents and is ready to read in data block, put AC_en=1, represent and open data block synchrotron, put AC_ready=0, Represent that data block synchrotron does not complete a wheel and accelerates;
Second step, after receiving Rst signals, unconditionally jumps into RESET_CNT states, RESET_ by LOCK_INT states Under CNT states, enumerator sh_cnt, sh_invalid_cnt reset, and prepare to start new round monitoring, and wherein sh_cnt is counted Monitoring Data block number, the invalid data block number of sh_invalid_cnt count synchronization heads;
Third step, when 66 data, i.e. test_sh=1 are read in, jumps into TEST_SH states, under TEST_SH states, Whether effectively to judge the synchronous head of current data block, if the synchronous head of current data block effectively, puts sh_valid=1, otherwise, If the synchronous head of current data block is invalid, sh_valid=0 is put, complete to judge rearmounted test_sh=0.
Four steps, as sh_valid=1 and AC_ready=0, enters VALID_SH states, and sh_cnt adds 1, (1) when sh_cnt<When 64, represent that epicycle monitoring not yet terminates, read in next secondary data, be i.e., after test_sh=1, return the 3rd step Suddenly;(2) as sh_cnt=64 and sh_invalid_cnt=0, then the effective synchronous head of epicycle monitoring continuous monitoring to 64, turns Enter state 64_GOOD, put block_lock=1, the synchronous success of expression data block is put AC_en=0, represents that closing data block is same Step accelerator, returns second step;(3) as sh_cnt=64 and sh_invalid_cnt>0, then epicycle monitoring terminates, but has not The data block invalid more than 16 synchronous heads, it is impossible to determine whether data block is synchronous, needs further to monitor, and returns second step Suddenly;
5th step, as sh_valid=0 and AC_ready=0, enters state I NVALID_SH, and sh_cnt adds 1, Sh_invalid_cnt adds 1, and (1), as block_lock=0, now data block is sentenced synchronously and during synchronous monitoring The asynchronous head of disconnected current sync head test position maximum probability, synchronous head test position enter new round prison to high-order mobile one Survey, return second step;(2) as block_lock=1 and sh_invalid_cnt=16, judge that now data block is different Walk, put blok_lock=0, synchronous head test position is mobile one to a high position, and open data block synchrotron and put AC_ En=1, returns second step;(3) as block_lock=1 and sh_invalid_cnt<When 16 and sh_cnt=64, epicycle is supervised Survey terminates, it is impossible to judge whether data block is synchronous, needs further to be monitored, and returns second step;(4) work as block_lock=1 And sh_invalid_cnt<16 and sh_cnt<When 64, epicycle monitoring does not terminate, and is test_sh in next group of 66 data readings After=1, third step is jumped to.
6th step, work as AC_ready=1, i.e. data block synchrotron complete a wheel accelerate when, enter state AC_ LOCK, puts sh_cnt=sh_cnt+m, puts sh_invalid_cnt=0, and synchronous head test position is moved to position n, puts AC_ Ready=0, prepares to start next round acceleration, when next group of data reading is test_sh=1, returns third step.
Often wheel accelerates to read in m 66 data of group the present invention, and whether every to 66 Data Detection of per group of reading adjacent two For synchronous head, to 66 data accumulation testing results of m groups, so as to quickly determine synchronous head position, detection efficiency is improve, shortened Data block synchronous time.
Description of the drawings
Fig. 1 is the schematic diagram of data block synchrotron preferred embodiment of the present invention.
Fig. 2 is the Organization Chart of 66 position locks.
Fig. 3 is that the state of 10G Ethernets Physical Coding Sublayer rapid data block synchronization method preferred embodiment of the present invention is jumped Turn figure.
Specific embodiment
Data block synchrotron of the present invention and 10G Ethernet Physical Coding Sublayer rapid data block synchronization methods It is applied in the network equipment.The network equipment can be router or switch.
Refering to shown in Fig. 1, it is the schematic diagram of data block synchrotron preferred embodiment of the present invention.The data block synchronization Accelerator reads in clock as clock with data, is run in the form of streamline.Data block synchrotron is often taken turns acceleration and reads in m groups 66 data, are designated as RX successively0、RX1,…,RXm-1.When synchronous head is not synchronous, one group of 66 data RX is often read ink(k=0, 1,2 ..., m-1) after, data block synchrotron is to 66 data RXkEvery adjacent two (66 pairs) do XOR, obtain Arrive RXk66 testing results TAG_TEMk(TAG_TEMk[i]=RXk[i]^RXk[i+1], (i=0,1,2 ..., 65)), and tire out 66 testing results TAG that meter epicycle acceleratesk=TAG_TEM0&TAG_TEM1&…&TAG_TEMk, wherein & represents and computing.When After reading in 66 data of m groups, 66 testing results TAG that epicycle acceleratesm-1Middle most of position should be 0, be that 1 position is then Possible synchronous head position.Data block synchrotron determines 66 testing results TAG that epicycle acceleratesm-1In from low order end most Near for 1 position n, so as to maximum probability locking synchronization head position.In the present embodiment, the m values are between 6-10, i.e. m =6,7,8,9 or 10.Per group of 66 data are a data block.
In the present embodiment, the data block synchrotron utilizes XOR door to RXkEvery adjacent two do different Or computing, reading in one group of 66 data RXkAnd obtain RXk66 testing results TAG_TEMkAfterwards, TAG_TEM is closedkIn be XOR door corresponding to 0 position (can not possibly be the position of synchronous head).It is unnecessary that this measure can be greatly decreased XOR, has saved power consumption.
In the present embodiment, the data block synchrotron determines TAG using 66 position locksm-1In from low level End nearest for 1 position n.The Organization Chart of 66 position locks is shown in Figure 2.
Refering to shown in Fig. 2, it is the Organization Chart of 66 position locks.66 position locks include multiple 8 lockings Device and address arbiter.Each 8 lock is input into 8 data, exports valid and out [2:0].Valid is 18 digits of instruction According in, at least 1 is 1, and it is out [2 that lowest order is 1 position:0];Valid is that 08 data of instruction are all 0.Arbitrate address Output result of the device according to 8 locks, according to from low level to high-order priority orders, exports 66 input datas TAGm-1 In from low order end nearest for 1 position n.
Refering to shown in Fig. 3, it is 10G Ethernets Physical Coding Sublayer rapid data block synchronization method preferred embodiment of the present invention State transition figure.The state transition figure describes 10G Ethernets Physical Coding Sublayer rapid data block synchronization method of the present invention Flow process as follows:
First step, under LOCK_INT states, puts block_lock=0, represents that now data block is asynchronous;Put test_ Sh=0, represents and is ready to read in data block (i.e. 66 data);AC_en=1 is put, is represented and is opened data block synchrotron;Put AC_ready=0, represents that data block synchrotron does not complete a wheel and accelerates.
Second step, after receiving Rst signals, unconditionally jumps into RESET_CNT states by LOCK_INT states.RESET_ Under CNT states, enumerator sh_cnt, sh_invalid_cnt reset, and prepare to start new round monitoring.Sh_cnt is counted and is monitored Data block number, the invalid data block number of sh_invalid_cnt count synchronization heads.64 groups of 66 data are read in often wheel monitoring.
Third step, when 66 data (i.e. test_sh=1) are read in, jumps into TEST_SH states.TEST_SH states Under, judge whether the synchronous head of current data block is effective.If the synchronous head of current data block effectively, puts sh_valid=1;No Then, if the synchronous head of current data block is invalid, sh_valid=0 is put.Complete to judge rearmounted test_sh=0.Judge data block Synchronous head whether judged for certain adjacent two (i.e. synchronous head test position) in data block, if data block In two nothings 01 overturn, then the synchronous head of the data block is invalid.
Four steps, as sh_valid=1 and AC_ready=0, enters VALID_SH states, and sh_cnt adds 1.Work as sh_ cnt<When 64, represent that epicycle monitoring not yet terminates, after next secondary data reads in (test_sh=1), return third step;When During sh_cnt=64 and sh_invalid_cnt=0, then epicycle monitoring continuous monitoring proceeds to state to 64 valid data blocks 64_GOOD, puts block_lock=1, represents the synchronous success of data block, puts AC_en=0, represent and close data block sync plus white Device, returns second step;As sh_cnt=64 and sh_invalid_cnt>0, then epicycle monitoring terminates, but has less than 16 The invalid data block of synchronous head, it is impossible to determine whether synchronous head is synchronous, needs further to monitor, and returns second step.
5th step, as sh_valid=0 and AC_ready=0, enters state I NVALID_SH, and sh_cnt adds 1, Sh_invalid_cnt adds 1.As block_lock=0, SLIP states are entered, now data block is synchronously and in synchronous monitoring During, judge that the asynchronous head of current sync head test position maximum probability, synchronous head test position move one (i.e. to high-order SLIP1), new round monitoring is entered, second step is returned;As block_lock=1 and sh_invalid_cnt=16, enter SLIP states, judge that now data block is asynchronous, put blok_lock=0, and synchronous head test position moves one (i.e. to high-order SLIP1), and open data block synchrotron (putting AC_en=1), return second step;As block_lock=1 and sh_ invalid_cnt<When 16 and sh_cnt=64, epicycle monitoring terminates, it is impossible to judge whether data block is synchronous, needs further to be supervised Survey, return second step;As block_lock=1 and sh_invalid_cnt<16 and sh_cnt<When 64, epicycle monitoring is not tied Beam, when next group of 66 data read in (i.e. test_sh=1), jumps to third step.
6th step, work as AC_ready=1, i.e. data block synchrotron complete a wheel accelerate when, enter state AC_ LOCK.Sh_cnt=sh_cnt+m is put, sh_invalid_cnt=0 is put, synchronous head test position is moved to position n (i.e. SLIP2), AC_ready=0 is put, prepares to start next round acceleration.When next group of data read in (i.e. test_sh=1), return Third step.Synchronous head test position is moved to position n can be referring to Fig. 1.
10G Ethernets Physical Coding Sublayer rapid data block synchronization method of the present invention is not in the case where original standard is destroyed Propose, increase data block synchrotron newly, during AC_en=1, open data block synchrotron, as AC_ready=1, represent Data block synchrotron has completed a wheel accelerator, locking synchronization head position n, the data block synchronization as AC_ready=0 Accelerator starts next round accelerator.The present invention can on the basis of original preferred circuit Design assistant accelerating circuit.When new In the case that method is invalid, will be according to standard method normal work.
Through simulation comparison experiment, as m=10, normal data block synchronization method averagely needs 125 clock cycle to complete to count According to block synchronization, 10G Ethernets Physical Coding Sublayer rapid data block synchronization method of the present invention only needs to 70 clock cycle and completes Data block synchronization, speed lift about 44%.

Claims (10)

1. a kind of data block synchrotron, is applied in the network equipment, it is characterised in that the data block synchrotron is often taken turns Accelerate to read in m 66 data of group, be designated as RX successively0、RX1、…、RXm-1, often read in one group of 66 data RXkAfterwards, k=0,1, 2 ..., m-1, data block synchrotron is to 66 data RXkEvery adjacent two do XOR, obtain RXk66 inspection Survey result TAG_TEMk, i.e. TAG_TEMk[i]=RXk[i]^RXk[i+1], i=0,1,2 ..., 65, ^ represent XOR, and 66 testing results TAG that accumulative epicycle acceleratesk=TAG_TEM0&TAG_TEM1&…&TAG_TEMk, wherein & represents and computing, After m 66 data of group are read in, data block synchrotron determines 66 testing results TAG that epicycle acceleratesm-1In from low level End nearest for 1 position n, so as to maximum probability locking synchronization head position.
2. data block synchrotron as claimed in claim 1, it is characterised in that the data block synchrotron utilizes 66 Position lock determines TAGm-1In from low order end nearest for 1 position n.
3. data block synchrotron as claimed in claim 2, it is characterised in that 66 position locks include multiple 8 locks and an address arbiter.
4. data block synchrotron as claimed in claim 1, it is characterised in that the data block synchrotron utilizes XOR Computing door is to RXkEvery adjacent two do XOR, read in one group of 66 data RXkAnd obtain RXk66 testing results TAG_TEMkAfterwards, TAG_TEM is closedkIn for 0 position corresponding to XOR door.
5. data block synchrotron as claimed in claim 1, it is characterised in that the m values are 6,7,8,9 or 10.
6. the 10G Ethernet Physical Coding Sublayers that the data block synchrotron described in a kind of utilization claim 1 is realized are quick Data block synchronization method, it is characterised in that the method includes:
First step, under LOCK_INT states, puts block_lock=0, represents that now data block is asynchronous, puts test_sh= 0, represent and be ready to read in data block, put AC_en=1, represent and open data block synchrotron, put AC_ready=0, represent Data block synchrotron does not complete a wheel and accelerates;
Second step, after receiving Rst signals, unconditionally jumps into RESET_CNT states, RESET_CNT shapes by LOCK_INT states Under state, enumerator sh_cnt, sh_invalid_cnt reset, and prepare to start new round monitoring, and wherein sh_cnt is counted and monitored Data block number, the invalid data block number of sh_invalid_cnt count synchronization heads;
Third step, when 66 data, i.e. test_sh=1 are read in, jumps into TEST_SH states, under TEST_SH states, judges Whether effectively the synchronous head of current data block, if the synchronous head of current data block is effective, puts sh_valid=1, otherwise, if working as The synchronous head of front data block is invalid, then put sh_valid=0, completes to judge rearmounted test_sh=0;
Four steps, as sh_valid=1 and AC_ready=0, enters VALID_SH states, and sh_cnt adds 1, and (1) works as sh_ cnt<When 64, represent that epicycle monitoring not yet terminates, read in next secondary data, be i.e., after test_sh=1, return third step; (2) as sh_cnt=64 and sh_invalid_cnt=0, then epicycle monitoring continuous monitoring is proceeded to 64 valid data blocks State 64_GOOD, puts block_lock=1, represents the synchronous success of data block, puts AC_en=0, represent and close data block synchronization Accelerator, returns second step;(3) as sh_cnt=64 and sh_invalid_cnt>0, then epicycle monitoring terminates, but has and do not surpass Cross 16 invalid data blocks of synchronous head, it is impossible to determine whether data block is synchronous, needs further to monitor, and returns second step;
5th step, as sh_valid=0 and AC_ready=0, enters state I NVALID_SH, and sh_cnt adds 1, sh_ Invalid_cnt adds 1, and (1), as block_lock=0, now data block synchronously and during synchronous monitoring judges to work as The asynchronous head of preamble head test position maximum probability, synchronous head test position enter new round monitoring, return to high-order mobile one Return second step;(2) as block_lock=1 and sh_invalid_cnt=16, judge that now data block is asynchronous, puts Blok_lock=0, synchronous head test position is to high-order mobile one, and opens data block synchrotron and put AC_en=1, Return second step;(3) as block_lock=1 and sh_invalid_cnt<When 16 and sh_cnt=64, epicycle monitoring knot Beam, it is impossible to judge whether data block is synchronous, needs further to be monitored, and returns second step;(4) as block_lock=1 and sh_ invalid_cnt<16 and sh_cnt<When 64, epicycle monitoring does not terminate, and is test_sh=1 in next group of 66 data readings Afterwards, third step is jumped to;
6th step, work as AC_ready=1, i.e. data block synchrotron complete a wheel accelerate when, enter state AC_LOCK, Sh_cnt=sh_cnt+m is put, sh_invalid_cnt=0 is put, synchronous head test position is moved to position n, puts AC_ready= 0, prepare to start next round acceleration, when next group of data reading is test_sh=1, return third step.
7. 10G Ethernets Physical Coding Sublayer rapid data block synchronization method as claimed in claim 6, it is characterised in that institute State data block synchrotron TAG is determined using 66 position locksm-1In from low order end nearest for 1 position n.
8. 10G Ethernets Physical Coding Sublayer rapid data block synchronization method as claimed in claim 7, it is characterised in that institute Stating 66 position locks includes multiple 8 locks and an address arbiter.
9. 10G Ethernets Physical Coding Sublayer rapid data block synchronization method as claimed in claim 6, it is characterised in that institute Data block synchrotron is stated using XOR door to RXkEvery adjacent two do XOR, read in one group of 66 digit According to RXkAnd obtain RXk66 testing results TAG_TEMkAfterwards, TAG_TEM is closedkIn for 0 position corresponding to XOR Door.
10. 10G Ethernets Physical Coding Sublayer rapid data block synchronization method as claimed in claim 6, it is characterised in that institute M values are stated for 6,7,8,9 or 10.
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CN1547361A (en) * 2003-12-05 2004-11-17 清华大学 A method for receiving Ethernet data

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CN1547361A (en) * 2003-12-05 2004-11-17 清华大学 A method for receiving Ethernet data

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