CN104601335B - The network equipment of multiple transmission ports - Google Patents
The network equipment of multiple transmission ports Download PDFInfo
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- CN104601335B CN104601335B CN201310534676.4A CN201310534676A CN104601335B CN 104601335 B CN104601335 B CN 104601335B CN 201310534676 A CN201310534676 A CN 201310534676A CN 104601335 B CN104601335 B CN 104601335B
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Abstract
The present invention relates to the network equipment of multiple transmission ports, specifically discloses a kind of network equipment, including：Multiple transmission ports, each transmission port are operable in master mode and one in subordinate mode, and the communication unit of each channel includes：Echo canceller, it is the first wave filter；Near-end crosstalk arrester, it is the second wave filter；And DFF, it is the 3rd wave filter；And control unit, when echo canceller and DFF continue within the first scheduled period according to identical code to update its respective coefficient, control unit is controlled to multiple transmission ports；Wherein, when more than two multiple transmission ports operations are in master mode, control unit, which is distributed, different several gives more than two transmission ports；And when these transmission ports two neighboring each operates in subordinate mode, control unit makes echo canceller or near-end crosstalk arrester stop updating its coefficient in the second preset time section.
Description
Technical field
The present invention relates to a kind of network equipment technology of multiple transmission ports, more particularly to a kind of cross clock domain（cross
clock domain）Elimination interference among transmitting ports network equipment and its correlation technique.
Background technology
The interference of current communication system processing cross clock domain eliminates（interference cancellation）Frequently with
Take Lip river structure（Farrow structure）To perform interpolative operation, to carry out the conversion of the clock zone of related data.Take Lip river structure
It is to utilize multinomial（polynomial）Approximation method, to simplify the complexity of interpolative operation.However, using polynomial near
Error can be produced like method, the maximum place of usual error occurs in the position that phase is 180 degree, also, when input and output
The clock of both data closer to when, error is bigger, and the effect for taking Lip river structure is also poorer.Particularly, when input and output number
When almost equal according to both clocks, expense Lip river structure almost can not accurate interpolation go out phase be 180 degree data value.
In HDMI Ethernet channel（HDMI Ethernet channel）Application in, due to
Using single line transmitted in both directions, therefore can receive simultaneously to square signal and the echo returned that rebounded because of one's own side institute transmission signal
Interference.It is therefore desirable to perform echo cancellation using echo canceller.Due to the network equipment at HDMI Ethernet channels both ends
A little error is had between used clock（0~200ppm）, therefore need first by the data of local side conveyer from its clock zone
After the clock zone for being converted to local side receiver, echo canceller carries out echo cancellation in the clock zone of local side receiver again.
Now, carry out clock zone conversion according to expense Lip river structure, then because the gap clock of conveyer and receiver is minimum, Fei Luojie
The interpolation results of structure can be very poor, and must be next approximate using the multinomial of very high-order, just there is preferable effect.It is but multinomial
Formula exponent number is higher, and the tapping point taken needed for the structure of Lip river is more, therefore complexity is higher with circuit cost, and signal delay is also got over
It is long.
In general, the network equipment such as exchanger with multiple transmission ports, can often run into from other transmission ports
Interference.For example, in order to reduce cost, the transformer in present multi-port switch is often by two or four
The coil of transmission port is wound on inside same component, because the Inside coil of transformer can cause signal to interact, so
Adjacent transmission port will interfere with each other and influence signal quality, and how to eliminate interference among transmitting ports turns into this technology
Field urgent problem.Therefore, it is necessary to develop new more transmission port network equipment technologies, with eliminate transmission port it
Between because interference problem caused by cross clock domain.
The content of the invention
Therefore, an object of the present invention is that solve to ask because disturbing caused by cross clock domain between above-mentioned transmission port
Topic.
According to the embodiment of the present invention, it provides a kind of network equipment, and it includes：Multiple transmission ports, each transmission
Port has multiple passages and is allocated for eliminating the several of the multiple interference among transmitting ports, and each transmission port can be grasped
Work includes in one of them of master mode and subordinate mode, the communication unit of each channel：Echo canceller, it is with more
First wave filter of individual tapping point, and the multiple tapping point corresponds to multiple first coefficients respectively, and passage sheet is come from for eliminating
Body sends the interference caused by signal returns；Near-end crosstalk arrester, it is the second wave filter with multiple tapping points, and institute
State multiple tapping points and correspond to multiple second coefficients respectively, the cross-talk for eliminating other passages from transmission port in itself is done
Disturb；And DFF, it is the 3rd wave filter with multiple tapping points, and the multiple tapping point corresponds to respectively
Multiple 3rd coefficients, for eliminating the intersymbol interference caused by remote signaling transmit process；And control unit, when echo disappears
When being continued except device and DFF within the first scheduled period according to identical symbol to update its respective coefficient, control
Unit processed is controlled to the multiple transmission port；Wherein, when more than two the multiple transmission port operations are in master control
During pattern, the different several transmission ports given more than described two of control unit distribution；And when the multiple transmission port
It is two neighboring when each operating in subordinate mode, control unit makes echo canceller or near-end crosstalk arrester when second is default
Between stop in section updating its coefficient.
According to another embodiment of the present invention, it provides a kind of network equipment, and it includes：Multiple transmission ports, it is each
Transmission port only has a passage and is allocated for eliminating the several of the multiple interference among transmitting ports, each transmission port
One of them of master mode and subordinate mode are operable in, the communication unit of each channel includes：Echo canceller, it is tool
There is the first wave filter of multiple tapping points, and the multiple tapping point corresponds to multiple first coefficients respectively, for eliminating from logical
Road sends the interference caused by signal returns in itself；And DFF, it is the 3rd filter with multiple tapping points
Ripple device, and the multiple tapping point corresponds to multiple 3rd coefficients respectively, for eliminating the symbol caused by remote signaling transmit process
Disturbed between number；And control unit, when echo canceller and DFF continue within the first scheduled period according to phase
When same symbol is to update its respective coefficient, control unit is controlled to the multiple transmission port；Wherein, when two with
On the multiple transmission port operate in master mode, control unit distributes different several biographies to more than described two
Defeated port；When the multiple transmission port two neighboring each operates in subordinate mode, control unit makes echo canceller exist
Stop updating its coefficient in second preset time section；And when the two neighboring of the multiple transmission port operates in master respectively
When control pattern and subordinate mode, control unit DFF is stopped renewal in the 3rd preset time section it is
Number.
According to another embodiment of the present invention, it provides a kind of network equipment, and it includes：Multiple transmission ports, it is each
Transmission port has transmission channel with receiving channel, and is allocated for eliminating the several of the multiple interference among transmitting ports,
The communication unit for receiving channel includes：Near-end crosstalk arrester, it is the first wave filter with multiple tapping points, and described more
Individual tapping point corresponds to multiple first coefficients respectively, for eliminating the cross-talk of other passages from transmission port in itself；Across
Port interference eliminator, it is the second wave filter with multiple tapping points, and the multiple tapping point corresponds to multiple respectively
Two coefficients, for eliminating the cross-talk of other passages from different transmission ports；And DFF, it is tool
There is the 3rd wave filter of multiple tapping points, and the multiple tapping point corresponds to multiple 3rd coefficients respectively, believes for eliminating distal end
Intersymbol interference caused by number transmit process；And control unit, distribute it is different several to the multiple transmission port, and
When near-end crosstalk arrester and DFF or across port interference eliminator continue first with DFF
In scheduled period according to identical symbol to update its respective coefficient when, control unit makes DFF pre- second
If stop updating its coefficient in time interval.
Brief description of the drawings
Fig. 1 is the block diagram according to the network equipment of embodiment of the present invention.
Fig. 2 is the block diagram according to the communication unit of embodiment of the present invention.
How Fig. 3 A to Fig. 3 D are the wave filters of Fig. 2 elimination signal generating circuit according to the defeated of asynchronous first in first out unit
Go out the change of mode, carry out the adjustment of tap coefficient and the relativeness of value of symbol.
Fig. 4 is the relation schematic diagram in the interference source of multiport gigabit Giga Ethernet devices.
The relation schematic diagram in interference source when Fig. 5 is multiport Giga Ethernet device practical applications.
Fig. 6 is the relation schematic diagram in the interference source of the automatic BRPHY Ethernets device of multiport.
Fig. 7 is the relation schematic diagram in the interference source of multiport Fast Ethernet device.
Embodiment
Your, to enable auditor to have further cognition to feature, purpose and the function of the present invention and understanding, below will
It is described with reference to the accompanying drawings embodiments of the present invention.
Fig. 1 is that have multiple biographies according to the block diagram of the network equipment 10 of embodiment of the present invention, network equipment 10
Defeated port, and each transmission port has at least one passage.By taking Fig. 1 embodiment as an example, network equipment 10 has four
Transmission port 0,1,2,3, and each transmission port has four passages（Channel）A、B、C、D.It is specific for any of which
For passage, communication unit 100, for example, transceiver（Transciver）, can configure in the channel, be passed to perform signal
Send the work with receiving.The communication unit 100 of each channel is respectively coupled to control unit 200 and is controlled by it, to eliminate
State the cross clock domain between multiple transmission ports（Cross clock domain）Interference.
Fig. 2 is according to the block diagram of the communication unit 100 of embodiment of the present invention, and it is used as biography using the first clock zone
Send machine（Transmitter, it is not shown）Operating clock domain, receiver is used as using second clock domain（Receiver, it is not shown）
Operating clock domain, and communication unit 100 be used for eliminate caused interference in signals transmission.Produce the conveyer of noise
There is the clock frequency of oneself（That is the first clock zone）, and receiver then uses time sequence restoration（Timing Recovery）Mechanism,
To pin the clock frequency of communication counterpart conveyer（That is second clock domain）If the first clock zone is not with second clock domain
Loop sequential（Loop timing）, and be belonging respectively to different clock zones, then need the interference for performing cross clock domain to eliminate.
During communication unit 100 carries out signal transmission and received, the transmission signal of conveyer can cause to receive in transmitting procedure
Disturbance during machine reception signal, if for example, conveyer is located at same one end of same passage with receiver, when conveyer passes through
During by signal transmission channel, receiver can receive the echo of signal bounce-back from channel（Echo）；If conveyer is distinguished with receiver
Belong to different passages, receiver can also receive the transmission signal in response to conveyer and caused cross-talk（Cross-talk）.For
With the network equipment for eliminating interference function, it can produce elimination signal according to the transmission signal of conveyer, so as to from reception
In the reception signal of machine offset because transmission signal and caused by interference.When being belonging respectively to first with reception signal due to transmission signal
Clock domain and second clock domain, the interference that communication unit 100 need to perform cross clock domain with reference to Fig. 1 control unit 200 eliminate work
Make.
As shown in Fig. 2 communication unit 100 includes first in first out（First-In, First-Out；FIFO）Circuit 110, disappear
Except signal generating circuit 120, adder 130 and DFF（Decision Feedback equalizer,
DFE）140.Fifo circuit 110 can receive the digital transmission signal of the first clock zone, and according to the first clock zone and second
Accumulative difference of injection time between clock zone（accumulated timing error）, the digital transmission signal in output second clock domain.
Fifo circuit 110 is mainly used for controlling the order and speed of digital transmission signal input/output, without for its signal
The size of value is handled.Particularly, fifo circuit 110 can be according to its input clock domain（That is the first clock zone）With output
Clock zone（That is second clock domain）Between accumulative difference of injection time, the way of output of digital transmission signal is adjusted, to carry out clock zone
Conversion.
The digital transmission signal that signal generating circuit 120 can be exported according to fifo circuit 110 is eliminated, produces elimination
Signal, the interference signal received for cancellation receiver, and interference signal is in response to digital transmission signal and it is caused.Especially
It is that elimination signal generating circuit 120 can be according to the phase difference between interference signal and elimination signal, to adjust elimination signal, with drop
Low or removal phase difference.The data come are transmitted with communication counterpart by receiver can receive interference signal simultaneously, that is, dry
Signal is disturbed to be included in the digital received signals that receiver is received；Therefore, adder 130 is arranged in communication unit 100, its
It is coupled to and eliminates signal generating circuit 120, receives and eliminate signal and digital received signals, and subtract the digital received signals and disappear
Except being exported after signal, to perform the elimination of interference.Eliminating signal generating circuit 120 may include echo canceller（echo
canceller）, near-end crosstalk（Near-end cross talk, NEXT）Arrester（NEXT canceller）, do across port
Static condenser（cross-port NEXT canceller）Or the combination of above-mentioned arrester；Wherein, echo canceller is used to disappear
Except same passage sends the interference caused by signal returns in itself, near-end crosstalk arrester, which is used to eliminate, comes from same transmission port
The cross-talk of the other passages of itself, the cross-talk that across port interference eliminator is used to eliminate between different transmission ports are done
Disturb.Above-described arrester can be by adaptability（adaptive）The circuit structure of wave filter is realized；For example, echo cancellation
Device can be with multiple tapping points（Tap）The first wave filter, and the multiple tapping point corresponds to multiple first coefficients respectively；Closely
It can be the second wave filter with multiple tapping points to hold crosstalk canceller, and the multiple tapping point corresponds to multiple second systems respectively
Number；In embodiments, echo canceller and near-end crosstalk arrester can be respectively by finite impulse response (FIR)s（Finite Impluse
Response, FIR）Wave filter is formed.In addition, as shown in Fig. 2 DFF 140 be connected to adder 130 it
Afterwards, the digital received signals of interference have been eliminated with reception, and has further eliminated digital received signals and is transmitted from distal end to local
Caused intersymbol interference during end（Inter-Symbol Interference, ISI）.DFF 140
Can be the 3rd wave filter with multiple tapping points, and the multiple tapping point corresponds to multiple 3rd coefficients respectively；Implementing
In mode, DFF 140 is by finite impulse response filter and IIR（Infinite Impluse
Response, IIR）Wave filter is formed.
In the present embodiment, the interference of cross clock domain, which eliminates, is divided into two parts to handle.If the numeral transmission shown in Fig. 2
Signal is in the first clock zone by multiple continuous symbols（Symbol）Formed, then on a timeline, each symbol can be considered one
Individual integral point, adjacent 2 points of spacing are the clock cycle of the first clock zone.When digital transmission signal is changed to second clock domain
When, symbol can deviate from the position of original integral point on a timeline, and be located at non-integer point.In the present embodiment, this is non-
Integer will be divided into integer and decimal two parts, if for example, special symbol is located at x.y（X and y represents integer and fractional part respectively
Point）Position, then be divided into x and 0.y two parts, be respectively processed.First, will be original using fifo circuit 110
It is located at x integral point in first clock zone, is exported at x.y time point（That is, exported according to the speed in second clock domain）, with
Handle the part of integer.Because the speed of first and second clock zone is different, fifo circuit 110 refers to first and second
Accumulative difference of injection time between clock zone, in due course machine once export more symbol（When the first clock zone is faster than second clock domain
When）Or at least skip and do not export any symbol once（When the first clock zone is slower than second clock domain）.Then, due to decimal
Part is not yet handled, so eliminate signal generating circuit 120 eliminates letter according to caused by the output of fifo circuit 110
Number, there is phase difference between meeting and interference signal, now, adaptability can be performed according to this phase difference by eliminating signal generating circuit 12
（Adaptive）Algorithm follows the trail of the interference signal of out of phase, and to adjust elimination signal, reaching comparatively fast reduces or remove this phase
The effect of potential difference.Mode whereby, the untreated caused error of fractional part can be eliminated, is disappeared with completing the interference of cross clock domain
Remove.For example, utilize least fibre method（Least Mean Square；LMS）Or recursive least-squares method（Recursive Least
Squares；RLS）, it is above-mentioned as elimination signal generating circuit to adjust and to update to follow the trail of the interference signal of out of phase
The coefficient of 120 adaptive filter；Program above is alternatively referred to as trained（Training）The coefficient of wave filter.Wherein, most
Small method belongs to prior art with recursive least-squares method, so being not described in detail herein.
In order to further eliminate the interference between the multiple transmission port, each transmission port can distribute several
（Seed）So that all passages of each transmission port have identical several.It is several that there is cycle period, such as can select
One group of buffer（Such as 11）Initial value be used as several, the initial value of this group of buffer is length for 2047 and had
There is periodic pseudo noise sequence（Pseudo-Noise（PN）sequence）, pseudo noise sequence can every 2047 positions circulation one
It is secondary, that is to say, that several cycle periods is 2047, in addition, several and data flow after logical operation by that will produce
Transmission signal, therefore, using several characteristics with cycle period, can according to neighboring transmission port it is several between time
Distance, control unit is set to carry out its controlling mechanism by the operation described by present embodiment.
By taking Fig. 1 embodiment as an example, it is assumed that transmission port 0 is allocated the first several, allocated second number of transmission port 1
Kind, when first it is several be less than critical value with second several time gap when, expression first it is several with second it is several soon overlap,
Now, it is interference that transmission port 0 issues on earth that can not correctly differentiate, or neighbouring transmission port 1 is to transmission port 0
Interference, then network equipment 10 will stop update near-end crosstalk arrester filter coefficient disappear with across the port interference of continuous updating
Except device.On the other hand, when first is several and second several time gap is more than critical value, first several and the second number is represented
Kind is just remote, and network equipment 10 will reopen the update mechanism of the filter coefficient of near-end crosstalk arrester.
As shown in Fig. 2 fifo circuit 110 may include synchronous first in first out（Synchronous FIFO）Unit 111
With asynchronous first in first out（Asynchronous FIFO）Unit 112.Synchronous first in first out unit 111 receives in the first clock zone
The digital transmission signal of multiple symbols, and the symbol of temporary a portion are included, it is defeated for the asynchronous elasticity of first in first out unit 112
The use gone out.Asynchronous first in first out unit 112 can be according to the accumulative difference of injection time between the first clock zone and second clock domain, second
Each clock of clock zone performs one of them of following three kinds of possible way of outputs：Export the single-point in the multiple symbol
Symbol（This is in general normal conditions）, the multiple symbol of output continuous two point symbol（Hereinafter also referred to mend a little, it is intended that ratio
Normal conditions multi output is a bit）And do not export any symbol（Hereinafter also referred to fall a little, it is intended that fewer than normal conditions to export one
Point）.When the accumulative difference of injection time between first and second clock zone is not up to the clock cycle（Namely two gap between clock zone less than one
Individual symbol section）, asynchronous first in first out unit 112 only need to from synchronous first in first out unit 111 normally output one symbol, be not required to
Carry out mending point or fall a little.However, when the first clock zone is faster than second clock domain and accumulative difference of injection time reaches the clock cycle, represent
Second clock domain has fallen the latter symbol section, and now asynchronous first in first out unit 112 need to be from synchronous first in first out unit 111 1
Secondary continuous two symbols of output, can just catch up with the first clock zone；And when the first clock zone is slower than second clock domain and accumulative sequential
When difference reaches the clock cycle, the super previous symbol section in second clock domain is represented, now asynchronous first in first out unit 112 is then temporary
Stopping transportation goes out any symbol, the first clock zone is caught up with and comes.
In Fig. 2 embodiment, communication unit 100 has the function of the difference of injection time between detectable two clock zones, and it is grasped
It is as described below to make mechanism.When the reception clock of local side is faster than the transmission clock of remote parties, then reception clock is tuned up；Instead
It, then slow down reception clock；Mode pins the transmission clock of other side whereby.Therefore, eliminating signal generating circuit 120 can be built-in
Sequential summing elements（It is not shown）, to add up the number tuned up or slow down according to each testing result.Work as cumulative number
When reaching equivalent to a clock cycle or symbol section is tuned up, sequential accumulator 24 notifies asynchronous FIFO unit 212 to carry out
Fall action a little；And when cumulative number reaches equivalent to a clock cycle is slowed down, sequential summing elements notify asynchronous elder generation
Enter first to go out the action that unit 112 mend point.For example, sequential summing elements are phase accumulator, and between two foregoing clock zones
Accumulative difference of injection time be that accumulated phase is poor.Can be by the phase-locked loop with 64 phases, when phase accumulator is accumulated toward front jumping
64 phases（Add up 64 times to tune up）Or 64 phases are jumped backward（Add up 64 times to slow down）When, it must just notify different
Step first in first out unit 112 does the action for falling a little or mending point accordingly.In another example sequential summing elements are frequency accumulator,
And the accumulative difference of injection time between two foregoing clock zones is that cumulative frequency is poor.Can be by voltage controlled oscillator, can be with by the adjustment of frequency
Corresponding phase adjustment is scaled, and is calculated when frequency accumulator adds up how many number that is, having tuned up or slow down one
Clock cycle.
In embodiments, signal generating circuit 120 is eliminated（For example, echo canceller, near-end crosstalk arrester）For tool
There is the wave filter of multiple tapping points, and each intersymbol relativeness of the coefficient of each tapping point and digital transmission signal needs root
Adjusted according to the way of output of asynchronous first in first out unit 112, this relativeness is kept coherent over time.Fig. 3 A extremely scheme
How the wave filter for the elimination signal generating circuit 120 that 3D is Fig. 2 is according to the change of the way of output of asynchronous first in first out unit 112
Change, carry out the adjustment of tap coefficient and the relativeness of value of symbol.Eliminate the having with four tapping points of signal generating circuit 120
The example of limit impulse response filter is described as follows：Assuming that the value of symbol of each tapping point is respectively D（n）、D（n-1）、D（n-2）、D
（n-3）, and corresponding tap coefficient is followed successively by a0, a1, a2, a3, as shown in Figure 3A.If do not carry out mend point or fall a little move
Make, then in next clock, value of symbol D can be increased newly such as general scenario（n+1）, other values of symbol then one point of forward impelling successively
Contact（D（n-3）Then it is rejected）, each tap coefficient is still successively a0, a1, a2, a3, is made between tap coefficient and value of symbol
Relativeness keeps coherent, as shown in Figure 3 B.If however, not being general scenario in next clock, but benefit point is carried out, then respectively
The value of symbol of tapping point is changed into D（n+2）、D（n+1）、D（n）、D（n-1）（Once increase two value of symbol D newly（n+1）With D（n+
2））, and be maintain foregoing relativeness coherent, tap coefficient must toward move right a tapping point, be adjusted to 0, a0,
a1、a2（Due to D（n+2）It is additional in addition, corresponding tap coefficient does not produce yet, so being reset to 0）, such as Fig. 3 C institutes
Show；If conversely, carrying out a little, the value of symbol of each tapping point still maintains D（n）、D（n-1）、D（n-2）、D（n-3）（Do not increase newly
Value of symbol）, and tap coefficient then moves to left a tapping point, is adjusted to a1, a2, a3,0（Due to D（n-3）Originally should give up, institute
There is corresponding tap coefficient to be reset to 0）, as shown in Figure 3 D.
The also another practice, it remains motionless for the position of tap coefficient, the position of a moving symbol value, equally may be used
Reach the effect for maintaining relativeness coherent.If for example, mending the situation of point, then each value of symbol in Fig. 3 A is moved along one
Individual tapping point, D（n）The position being available is by increasing value of symbol D newly（n+1）Fill, and another newly-increased value of symbol D（n+2）It is then direct
Substitute D（n-2）Position, and corresponding tap coefficient is reset to 0, you can reach such as Fig. 3 C effect.If fall a little
Situation, then by each value of symbol loopy moving in Fig. 3 A, namely each value of symbol is moved along a tapping point, and the symbol of foremost
Number value D（n-3）Then it is moved back to original D（n）Position, and by D（n-3）Corresponding tap coefficient is reset to 0, you can reaches such as figure
3D effect.
In the mechanism that the interference of above-mentioned cross clock domain eliminates, if more than two arresters or balanced device continue one section
Between go to update with identical data symbol or train respective filter coefficient, then can cause the multiple arrester or balanced device
Between filter coefficient interact, and cause its filter coefficient not restrain suitably；This phenomenon can be described as counting again
Kind bumps against（Seed Collision）.For example, in Ethernet audio return channel（HDMI Ethernet&Audio return
Channel, abbreviation HEAC）In, echo canceller and the DFF of communication unit 100 can be possible to because each other
Continue the section of hop count kind collision and go to update respective filter coefficient with identical data symbol, occur what convergence was pullled
Situation.For the situation of this kind of several collisions, the present invention proposes new control technology, suspended by Fig. 1 control unit 200
Renewal responds the filter coefficient of most stable of arrester or balanced device, can not suitably be restrained with solving above-mentioned filter coefficient
The problem of, its details is illustrated below.
First example is to be applied to multiport Giga Ethernets（Multi-port Giga Ethernet）, its network dress
Putting has 4 transmission ports（Transmission port 0,1,2,3）, each transmission port is operable in master control（Master）Pattern and subordinate
（Slave）One of them of pattern.Fig. 4 is the relation schematic diagram in the interference source of multiport Giga Ethernet devices, and it is
Using the passage A of transmission port 1 as explanation target, the neighboring transmission port 0,1,2 from local side and distal end transmission letter are shown
Number various may interfere with source；Wherein, EC represents same passage（The passage A of transmission port 1）Itself sends signal and returns to institute
Caused by echo disturb, NEXT X represent same transmission port（Transmission port 1）The other channels of itself（Channel B, C, D, with X
Represent）Near-end crosstalk interference, A_NEXT X up/down represents different transmission ports（Transmission port 0,2）Each channel（Channel
A, B, C, D, represented with X）Between from it is upper or from it is lower and come across port cross-talk, FE represent reception signal from distal end and transmit
To the signal after affected by inter-symbol interference during local side.Because three neighboring transmission ports 0,1,2 shown in Fig. 4 are operable
In master mode either subordinate mode, therefore meet together and eight kinds of possible combinations occur, it responds the optimal of several collision generations
Details are as follows for mode.
（1）Transmission port 0,1,2 each operates in master mode, then when network equipment starts, control unit 200 is just distributed
It is different it is several give each transmission port 0,1,2, so as to from the beginning it is avoided that its several situation to collide with one another occurs.
（2）Transmission port 0,1,2 operates in master control, master control, subordinate mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 0 and 1, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.In addition, when from the passage A of transmission port 2 from it is lower and come across port cross-talk（Under A_NEXT A）With from distal end
When several collisions occur between the intersymbol interference FE of signal, the response of DFF is relatively stable, therefore controls
The DFF that unit 200 processed can temporarily cease transmission port 1 updates its filter coefficient.
（3）Transmission port 0,1,2 operates in master control, subordinate, master mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 0 and 2, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.When from the passage A of transmission port 0 from it is upper and come across port cross-talk（On A_NEXT A）With from remote signaling
When several collisions occur between intersymbol interference FE, the response of DFF is relatively stable, therefore control unit
200 DFFs that can temporarily cease transmission port 1 update its filter coefficient.In addition, when logical from transmission port 2
Road A from it is lower and come across port cross-talk（Under A_NEXT A）Number occurs between the intersymbol interference FE from remote signaling
When kind bumps against, the response of DFF is relatively stable, therefore control unit 200 can temporarily cease transmission port 1
DFF update its filter coefficient.
（4）Transmission port 0,1,2 operates in master control, subordinate, subordinate mode respectively, then when from the passage A of transmission port 0 from
Upper across port cross-talk（On A_NEXT A）Several phases occur between the intersymbol interference FE from remote signaling
When hitting, the response of DFF is relatively stable, therefore control unit 200 can temporarily cease sentencing for transmission port 1
Certainly feedback equalizer updates its filter coefficient.Done in addition, working as from the passage A of transmission port 2 from across port cross-talk that is lower and coming
Disturb（Under A_NEXT A）When several collisions occur between the echo interference EC of the passage A of transmission port 1 in itself, echo canceller
Response it is relatively stable, therefore control unit 200 can temporarily cease the echo canceller of transmission port 1 and update its wave filter
Coefficient.
（5）Transmission port 0,1,2 operates in subordinate, master control, master mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 1 and 2, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.When from the passage A of transmission port 0 from it is upper and come across port cross-talk（On A_NEXT A）With from remote signaling
When several collisions occur between intersymbol interference FE, the response of DFF is relatively stable, therefore control unit
200 DFFs that can temporarily cease transmission port 1 update its filter coefficient.
（6）Transmission port 0,1,2 operates in subordinate, master control, subordinate mode respectively, then when from the passage A of transmission port 0 from
Upper across port cross-talk（On A_NEXT A）Several phases occur between the intersymbol interference FE from remote signaling
When hitting, the response of DFF is relatively stable, therefore control unit 200 can temporarily cease sentencing for transmission port 1
Certainly feedback equalizer updates its filter coefficient.Done in addition, working as from the passage A of transmission port 2 from across port cross-talk that is lower and coming
Disturb（Under A_NEXT A）When several collisions occur between the intersymbol interference FE from remote signaling, DFF
Response is relatively stable, therefore control unit 200 can temporarily cease the DFF of transmission port 1 and update its filtering
Device coefficient.
（7）Transmission port 0,1,2 operates in subordinate, subordinate, master mode respectively, then when from the passage A of transmission port 0 from
Upper across port cross-talk（On A_NEXT A）Occur between the echo interference EC of the passage A of transmission port 1 in itself
During several collisions, the response of echo canceller is relatively stable, therefore control unit 200 can temporarily cease transmission port 1
Echo canceller updates its filter coefficient.When across the port cross-talk come from the passage B/C/D of transmission port 0（A_
NEXT B/C/D）When several collisions occur between the passage B/C/D of transmission port 1 near-end crosstalk interference NEXTB/C/D, closely
Hold the response of crosstalk canceller relatively stable, therefore control unit 200 can temporarily cease the near-end crosstalk of transmission port 1 and disappear
Except device updates its filter coefficient.In addition, when from the passage A of transmission port 2 from it is lower and come across port cross-talk（A_
Under NEXTA）When several collisions occur between the intersymbol interference FE from remote signaling, the response phase of DFF
To more stable, therefore control unit 200 can temporarily cease the DFF of transmission port 1 and update its wave filter system
Number.
（8）Transmission port 0,1,2 is all operated in subordinate mode, then when from the passage A of transmission port 0 from it is upper and come across end
Mouth cross-talk（On A_NEXT A）When several collisions occur between the echo interference EC of the passage A of transmission port 1 in itself, return
The response of sound arrester is relatively stable, therefore control unit 200 can temporarily cease the echo canceller renewal of transmission port 1
Its filter coefficient.When across the port cross-talk come from the passage B/C/D of transmission port 0（A_NEXTB/C/D）With transmission
When several collisions occur between the passage B/C/D of port 1 near-end crosstalk interference NEXT B/C/D, the sound of near-end crosstalk arrester
Should relatively it stablize, therefore control unit 200 can temporarily cease the near-end crosstalk arrester of transmission port 1 and update its wave filter
Coefficient.In addition, when from the passage A of transmission port 2 from it is lower and come across port cross-talk（Under A_NEXT A）With transmission port 1
Passage A echo interference EC in itself between when several collisions occur, the response of echo canceller is relatively stable, therefore controls
The echo canceller that unit 200 processed can temporarily cease transmission port 1 updates its filter coefficient.
Wherein, for above-mentioned（6）And（8）, two across port interference eliminators just occur at the beginning of convergence with identical
Data symbol goes to update its filter coefficient（Namely several collisions）Probability it is very low, therefore can be set in the circuit of control unit 200
Timing does not account for, to reduce the complexity and development cost of the circuit of control unit 200.In summary, for Giga ether
For network equipment, its control unit may be summarized as follows according to several controlling mechanisms for bumping against generation：When more than two described
Multiple transmission port operations are in master mode, the different several transmission ports given more than described two of control unit distribution；
Two neighboring when the multiple transmission port operates in master mode and during subordinate mode respectively, and control unit makes decision-feedback
Balanced device stops updating its filter coefficient in preset time section；And when the two neighboring of the multiple transmission port is grasped
Make in subordinate mode, control unit makes echo canceller or near-end crosstalk arrester stop updating it in preset time section
Filter coefficient.Wherein, above-mentioned preset time section can be more than 10 symbol sections and be less than 30 symbol sections, visual real
Depending on the situation of border.
In the practical application of multiport Giga Ethernets, explanation mesh is still used as using the passage A of transmission port 1 below
Mark, disturbing for distant place passage is much larger than because each channel is disturbed by adjacent channel, therefore actually need to only consider passage sheet
The echo interference EC of body, transmission port passage B/C/D near-end crosstalk itself are disturbed NEXT B/C/D, led to from transmission port 0
Road C and D and come across port cross-talk（A_NEXT C/D）And the intersymbol interference FE from remote signaling.Fig. 5 is more
The relation schematic diagram in the interference source of port Giga Ethernets device on this condition.Due to three adjacent biographies shown in Fig. 5
Defeated port 0,1,2 is operable in master mode either subordinate mode, therefore meets together and eight kinds of possible combinations, its number of responses occur
Details are as follows for the best mode that kind collision occurs.
（1）Transmission port 0,1,2 each operates in master mode, then when network equipment starts, control unit 200 is just distributed
It is different it is several give each transmission port 0,1,2, so as to from the beginning it is avoided that its several situation to collide with one another occurs.
（2）Transmission port 0,1,2 operates in master control, master control, subordinate mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 0 and 1, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.
（3）Transmission port 0,1,2 operates in master control, subordinate, master mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 0 and 2, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.
（4）Transmission port 0,1,2 operates in master control, subordinate, subordinate mode respectively, then control unit 200 need not perform
Any action.
（5）Transmission port 0,1,2 operates in subordinate, master control, master mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 1 and 2, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.
（6）Transmission port 0,1,2 operates in subordinate, master control, subordinate mode respectively, then control unit 200 need not perform
Any action.
（7）Transmission port 0,1,2 operates in subordinate, subordinate, master mode respectively, then when from 0 channel C of transmission port/D
And the cross-talk come（A_NEXT C/D）Occur between channel C/D of transmission port 1 near-end crosstalk interference NEXT C/D
During several collisions, the response of near-end crosstalk arrester is relatively stable, therefore control unit 200 can temporarily cease transmission port
1 near-end crosstalk arrester updates its filter coefficient.
（8）Transmission port 0,1,2 each operates in subordinate mode, then when the cross-talk come from 0 channel C of transmission port/D is done
Disturb（A_NEXT C/D）When several collisions occur between channel C/D of transmission port 1 near-end crosstalk interference NEXT C/D, closely
Hold the response of crosstalk canceller relatively stable, therefore control unit 200 can temporarily cease the near-end crosstalk of transmission port 1 and disappear
Except device updates its filter coefficient.
Therefore, for the practical application of Giga Ethernet devices, its control unit bumps against what is occurred according to several
Controlling mechanism may be summarized as follows：When more than two the multiple transmission port operations are in master mode, control unit distribution
Different is several to described two transmission ports above；And when the two neighboring of the transmission port each operates in subordinate mould
During formula, control unit makes near-end crosstalk arrester stop updating its filter coefficient in preset time section.Wherein, it is above-mentioned
Preset time section can be more than 10 symbol sections and be less than 30 symbol sections, depending on visual actual conditions.Control unit 200
The complexity and development cost of circuit can be reduced more.
Second example is to be applied to the automatic BRPHY Ethernets of multiport（Multi-port Automotive BRPHY
Ethernet）, its network equipment has multiple transmission ports, and each transmission port only has a passage, and is operable in master
One of them of control pattern and subordinate mode.Fig. 6 is that the relation in the interference source of the automatic BRPHY Ethernets device of multiport is shown
It is intended to, it is to show neighboring transmission port 0,1,2 from local side and distal end as target is illustrated using transmission port 1
It is various to may interfere with source；Wherein, EC represents same transmission port（The passage A of transmission port 1）Itself sends signal and returns to institute
Caused by echo disturb, A_NEXT A up/down represents different transmission ports（Transmission port 0,2）Passage A between from it is upper or from
Lower across port cross-talk, FE represent that reception signal is affected by inter-symbol interference during being sent to local side from distal end
Signal afterwards.Because three neighboring transmission ports 0,1,2 shown in Fig. 6 are operable in master mode either subordinate mode, because
This, which meets together, there are eight kinds of possible combinations, and it responds several best modes for bumping against generation, and details are as follows.
（1）Transmission port 0,1,2 each operates in master mode, then when network equipment starts, control unit 200 is just distributed
It is different it is several give each transmission port 0,1,2, so as to from the beginning it is avoided that its several situation to collide with one another occurs.
（2）Transmission port 0,1,2 operates in master control, master control, subordinate mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 0 and 1, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.In addition, when from the passage A of transmission port 2 from it is lower and come across port cross-talk（Under A_NEXT A）With from distal end
When several collisions occur between the intersymbol interference FE of signal, the response of DFF is relatively stable, therefore controls
The DFF that unit 200 processed can temporarily cease transmission port 1 updates its filter coefficient.
（3）Transmission port 0,1,2 operates in master control, subordinate, master mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 0 and 2, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.When from the passage A of transmission port 0 from it is upper and come across port cross-talk（On A_NEXT A）With from remote signaling
When several collisions occur between intersymbol interference FE, the response of DFF is relatively stable, therefore control unit
200 DFFs that can temporarily cease transmission port 1 update its filter coefficient.In addition, when logical from transmission port 2
Road A from it is lower and come across port cross-talk（Under A_NEXT A）Number occurs between the intersymbol interference FE from remote signaling
When kind bumps against, the response of DFF is relatively stable, therefore control unit 200 can temporarily cease transmission port 1
DFF update its filter coefficient.
（4）Transmission port 0,1,2 operates in master control, subordinate, subordinate mode respectively, then when from the passage A of transmission port 0 from
Upper across port cross-talk（On A_NEXT A）Several phases occur between the intersymbol interference FE from remote signaling
When hitting, the response of DFF is relatively stable, therefore control unit 200 can temporarily cease sentencing for transmission port 1
Certainly feedback equalizer updates its filter coefficient.Done in addition, working as from the passage A of transmission port 2 from across port cross-talk that is lower and coming
Disturb（Under A_NEXT A）When several collisions occur between the echo interference EC of the passage A of transmission port 1 in itself, echo canceller
Response it is relatively stable, therefore control unit 200 can temporarily cease the echo canceller of transmission port 1 and update its wave filter
Coefficient.
（5）Transmission port 0,1,2 operates in subordinate, master control, master mode, then when network equipment starts, control respectively
Unit 200 just distribute it is different several to transmission port 1 and 2, so as to from the beginning it is avoided that its several situation to collide with one another
Occur.When from the passage A of transmission port 0 from it is upper and come across port cross-talk（On A_NEXT A）With from remote signaling
When several collisions occur between intersymbol interference FE, the response of DFF is relatively stable, therefore control unit
200 DFFs that can temporarily cease transmission port 1 update its filter coefficient.
（6）Transmission port 0,1,2 operates in subordinate, master control, subordinate mode respectively, then when from the passage A of transmission port 0 from
Upper across port cross-talk（On A_NEXT A）Several phases occur between the intersymbol interference FE from remote signaling
When hitting, the response of DFF is relatively stable, therefore control unit 200 can temporarily cease sentencing for transmission port 1
Certainly feedback equalizer updates its filter coefficient.Done in addition, working as from the passage A of transmission port 2 from across port cross-talk that is lower and coming
Disturb（Under A_NEXT A）When several collisions occur between the intersymbol interference FE from remote signaling, DFF
Response is relatively stable, therefore control unit 200 can temporarily cease the DFF of transmission port 1 and update its filtering
Device coefficient.
（7）Transmission port 0,1,2 operates in subordinate, subordinate, master mode respectively, then when from the passage A of transmission port 0 from
Upper across port cross-talk（On A_NEXT A）Occur between the echo interference EC of the passage A of transmission port 1 in itself
During several collisions, the response of echo canceller is relatively stable, therefore control unit 200 can temporarily cease transmission port 1
Echo canceller updates its filter coefficient.In addition, when from the passage A of transmission port 2 from it is lower and come across port cross-talk
（Under A_NEXT A）When several collisions occur between the intersymbol interference FE from remote signaling, the sound of DFF
Should relatively it stablize, therefore control unit 200 can temporarily cease the DFF of transmission port 1 and update its wave filter
Coefficient.
（8）Transmission port 0,1,2 each operates in subordinate mode, then when from the passage A of transmission port 0 from it is upper and come across end
Mouth cross-talk（On A_NEXT A）When several collisions occur between the echo interference EC of the passage A of transmission port 1 in itself, return
The response of sound arrester is relatively stable, therefore control unit 200 can temporarily cease the echo canceller renewal of transmission port 1
Its filter coefficient.In addition, when from the passage A of transmission port 2 from it is lower and come across port cross-talk（Under A_NEXT A）With
When several collisions occur between the echo interference EC of the passage A of transmission port 1 in itself, the response of echo canceller is relatively steady
It is fixed, therefore control unit 200 can temporarily cease the echo canceller of transmission port 1 and update its filter coefficient.
Wherein, for above-mentioned（6）With（8）, two across port interference eliminators just occur at the beginning of convergence with identical
Data symbol goes to update its filter coefficient（Namely several collisions）Probability it is very low, therefore can be in the circuit of control unit 200
Do not accounted for during design, to reduce the complexity and development cost of the circuit of control unit 200.In summary, for BRPHY with
Too for network equipment, its control unit may be summarized as follows according to several controlling mechanisms for bumping against generation：When more than two institutes
Multiple transmission port operations are stated in master mode, the different several transmission end given more than described two of control unit distribution
Mouthful；Two neighboring when the multiple transmission port operates in master mode and during subordinate mode respectively, and control unit makes judgement
Feedback equalizer stops updating its filter coefficient in preset time section；It is and two neighboring when the multiple transmission port
When each operating in subordinate mode, control unit makes echo canceller stop updating its filter coefficient in preset time section.
Wherein, above-mentioned preset time section can be more than 10 symbol sections and be less than 30 symbol sections, depending on visual actual state.
3rd example is to be directed to multiport Fast Ethernet（Multi-port Fast Ethernet）Application, its net
Network device has multiple transmission ports, and each transmission port has transmission channel TX and receives channel RX.Fig. 7 is that multiport is quick
The relation schematic diagram in the interference source of Ethernet device, it is using the receiving channel RX of transmission port 1 as explanation target, is shown
Out source is may interfere with from the neighboring transmission port 0,1,2 of local side and the various of distal end；Wherein, NEXT represents same biography
Defeated port（Transmission port 1）The other channels of itself（Transmit channel TX）Near-end crosstalk interference, A_NEXT up/down represents different
Transmission port（Transmission port 0,2）Between from it is upper or from it is lower and come across port cross-talk, FE represent reception signal from distal end
And it is sent to caused intersymbol interference during local side.The best mode that the several collisions of network equipment response occur is detailed
State as follows.
（1）When network equipment starts, control unit 200 just distribute it is different several to each transmission port 0,1,2, with
Just from the beginning it is avoided that its several situation to collide with one another occurs.
（2）When from transmission port 0 from it is upper and come across port cross-talk（On A_NEXT）With from remote signaling
When several collisions occur between intersymbol interference FE, the response of DFF is relatively stable, therefore control unit
200 DFFs that can temporarily cease transmission port 1 update its filter coefficient.
（3）When from transmission port 2 from it is lower and come across port cross-talk（Under A_NEXT）With from remote signaling
When several collisions occur between intersymbol interference FE, the response of DFF is relatively stable, therefore control unit
200 DFFs that can temporarily cease transmission port 1 update its filter coefficient.
（4）Near-end crosstalk interference NEXT as the Transfer pipe TX for carrying out transmission port 1 and the intersymbol from remote signaling
When several collisions occur between interference FE, the response of DFF is relatively stable, therefore control unit 200 can be temporary
When stop transmission port 1 DFF update its filter coefficient.
Therefore, for Fast Ethernet device, its control unit can according to several controlling mechanisms for bumping against generation
It is summarized as follows：Control unit, which is distributed, different several gives the multiple transmission port, and control unit to make decision feedback equalization
Device stops updating its filter coefficient in preset time section, and the preset time section can be more than 10 symbol sections and be less than
30 symbol sections, depending on visual actual conditions.
Therefore, according to the network equipment of embodiment of the present invention, it can be eliminated between transmission port because cross clock domain
Caused by interference problem.Embodiments described above, only the preferred embodiment of the present invention, and cannot be used for limitation originally
The scope of invention.The all changes made essentially according to scope of the present invention patent and modification, still do not depart from the present invention
Main idea, do not depart from the spirit and scope of the present invention, therefore be regarded as further embodiment of the present invention.
Claims (14)
1. a kind of network equipment, including：
There are multiple passages and being allocated for be done between eliminating the multiple transmission port for multiple transmission ports, each transmission port
That disturbs is several, and each transmission port is operable in one of them of master mode and subordinate mode, the communication unit of each channel
Comprising：
Echo canceller, it is the first wave filter with multiple tapping points, and the multiple tapping point corresponds to multiple respectively
One coefficient, the caused interference of signal return is sent in itself from the passage for eliminating；
Near-end crosstalk arrester, it is the second wave filter with multiple tapping points, and the multiple tapping point is corresponding more respectively
Individual second coefficient, for eliminating the cross-talk of other passages from the transmission port in itself；
DFF, it is the 3rd wave filter with multiple tapping points, and the multiple tapping point is corresponding more respectively
Individual 3rd coefficient, for eliminating the intersymbol interference caused by remote signaling transmit process；And
Control unit, when the echo canceller continues within the first scheduled period according to identical with the DFF
Symbol to update its respective coefficient when, described control unit is controlled to the multiple transmission port；
Wherein, when more than two transmission ports in the multiple transmission port are operated in master mode, the control is single
The different several transmission ports given more than described two of member distribution；And when the two neighboring of the multiple transmission port is grasped
Make in subordinate mode, described control unit makes the echo canceller or the near-end crosstalk arrester in the second preset time
Stop updating its coefficient in section.
2. network equipment according to claim 1, wherein, the echo canceller includes finite impulse response filter,
And the near-end crosstalk arrester includes another finite impulse response filter.
3. network equipment according to claim 1, wherein, the DFF includes finite impulse response filter
Device and infinite impulse response filter.
4. network equipment according to claim 1, wherein, it is described several for periodic pseudo noise sequence.
5. network equipment according to claim 1, wherein, when the multiple transmission port it is two neighboring each operate in from
During category pattern, described control unit make the near-end crosstalk arrester stop in the second preset time section update its be
Number.
6. network equipment according to claim 1, wherein, control of the described control unit to the multiple transmission port is also
Including：Two neighboring when the multiple transmission port operates in master mode and during subordinate mode respectively, described control unit
The DFF is set to stop updating its coefficient in the 3rd preset time section.
7. a kind of network equipment, including：
Multiple transmission ports, each transmission port only have a passage and being allocated for be done between eliminating the multiple transmission port
That disturbs is several, and each transmission port is operable in one of them of master mode and subordinate mode, the communication unit of each channel
Comprising：
Echo canceller, it is the first wave filter with multiple tapping points, and the multiple tapping point corresponds to multiple respectively
One coefficient, the caused interference of signal return is sent in itself from the passage for eliminating；And
DFF, it is the 3rd wave filter with multiple tapping points, and the multiple tapping point is corresponding more respectively
Individual 3rd coefficient, for eliminating the intersymbol interference caused by remote signaling transmit process；And
Control unit, when the echo canceller continues within the first scheduled period according to identical with the DFF
Symbol to update its respective coefficient when, described control unit is controlled to the multiple transmission port；
Wherein, when more than two transmission ports in the multiple transmission port are operated in master mode, the control is single
The different several transmission ports given more than described two of member distribution；Two neighboring when the multiple transmission port each operates in
During subordinate mode, described control unit makes the echo canceller stop updating its coefficient in the second preset time section；With
And when the two neighboring of the multiple transmission port operates in master mode and during subordinate mode respectively, described control unit makes institute
DFF is stated to stop updating its coefficient in the 3rd preset time section.
8. network equipment according to claim 7, wherein, the echo canceller includes finite impulse response filter.
9. network equipment according to claim 7, wherein, the DFF includes finite impulse response filter
Device and infinite impulse response filter.
10. network equipment according to claim 7, wherein, it is described several for periodic pseudo noise sequence.
11. a kind of network equipment, including：
Multiple transmission ports, each transmission port has transmission channel and receives channel, and is allocated for eliminating the multiple
Interference among transmitting ports it is several, it is described receive channel communication unit include：
Near-end crosstalk arrester, it is the first wave filter with multiple tapping points, and the multiple tapping point is corresponding more respectively
Individual first coefficient, for eliminating the cross-talk of other passages from the transmission port in itself；
Across port interference eliminator, it is the second wave filter with multiple tapping points, and the multiple tapping point corresponds to respectively
Multiple second coefficients, for eliminating the cross-talk of other passages from different transmission ports；And
DFF, it is the 3rd wave filter with multiple tapping points, and the multiple tapping point is corresponding more respectively
Individual 3rd coefficient, for eliminating the intersymbol interference caused by remote signaling transmit process；And
Control unit, distribute it is different several to the multiple transmission port, and when the near-end crosstalk arrester is sentenced with described
Certainly feedback equalizer or across the port interference eliminator continue the root within the first scheduled period with the DFF
During according to identical symbol to update its respective coefficient, described control unit makes the DFF when second is default
Between stop in section updating its coefficient.
12. network equipment according to claim 11, wherein, the near-end crosstalk arrester is filtered including finite impulse response (FIR)
Ripple device, across the port interference eliminator include another finite impulse response filter.
13. the network equipment according to claim 11, wherein, the DFF includes finite impulse response (FIR)
Wave filter and infinite impulse response filter.
14. network equipment according to claim 11, wherein, it is multiple described several for periodic pseudo noise sequence
Row.
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