CN103294633B - Universal serial bus switch - Google Patents
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- CN103294633B CN103294633B CN201210044584.3A CN201210044584A CN103294633B CN 103294633 B CN103294633 B CN 103294633B CN 201210044584 A CN201210044584 A CN 201210044584A CN 103294633 B CN103294633 B CN 103294633B
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Abstract
A kind of universal serial bus switch, in order to switch path between at least one master control set and controlled device with transmission of data signals.Switch comprises the first switch unit, the second switch unit, multiple main signal compensating unit and device signal compensation unit.Each main signal compensating unit is in order to connect master control set one to one and balanced and amplify the first data-signal received, and device signal compensation unit is then for connecting controlled device, and balanced and amplify the first data-signal.First switch unit and the second switch unit switch one of them of connection main signal compensating unit according to switching command, and between device signal compensation unit and the main signal compensating unit be connected, transmit the first data-signal and the second data-signal respectively.By this to increase degree of stability and the distance of data transmission.
Description
Technical field
The present invention relates to a kind of switch, and in particular to universal serial bus switch.
Background technology
Support that the universal serial bus switch of very high-speed data transfer can in order to arrange to meet the transmission path of the electronic installation of universal serial bus 3.0 version specification.As shown in Figure 1, after master control set is connected to the connectivity port 100 of switch 1, switch 1 normally provides Ultrahigh speed data path 10 2 and high-speed data channel 104 by switching control chip 10 simultaneously, in order to the switching of the Ultrahigh speed data and high-speed data that directly control master control set, and data are directly transferred to from switching control chip 10 controlled device being connected to connectivity port 106.But, in the process that data are transmitted between master control set, switch and controlled device, easily cause signal attenuation and loss along with the distance length of transmission, cause between master control set and controlled device to be limited in shorter distance, in order to avoid data-signal produces mistake.In addition, the function of most universal sequence bus unit all support hardware hot plugs (plug-n-play), if but electronic installation through being everlasting with switch high speed transmission data time, directly pull out from the port of switch, be easier to cause the connection of electronic installation and switch unstable and the problem of lost data.
Summary of the invention
The embodiment of the present invention provides a kind of universal serial bus switch, in order to switch the path between at least one master control set and a controlled device, to transmit the first data-signal and the second data-signal.Described switch comprises the first switch unit, the second switch unit, multiple main signal compensating unit and device signal compensation unit.Main signal compensating unit is used for being electrically connected master control set one to one, and the first data-signal received in order to equilibrium with amplify by the first balanced data-signal.Device signal compensation unit is for being electrically connected controlled device, and the first data-signal received in order to equilibrium and amplification are by the first balanced data-signal.Wherein, first switch unit and the second switch unit are also in order to electrical connection device signal compensation unit, and be electrically connected one of them of described multiple main signal compensating unit according to switching command, wherein, first switch unit transmits the first data-signal between device signal compensation unit and the main signal compensating unit that is electrically connected according to switching command, and the second switch unit in order to transmit the second data-signal between device signal compensation unit and the main signal compensating unit that is electrically connected according to switching command.
The universal serial bus switch that the embodiment of the present invention provides processes the data faster transmitted and the data transmitted more at a slow speed by the first switch unit and the division of labor of the second switch unit, reduces manufacture complexity and the cost of switch unit.Main signal compensating unit and device signal compensation unit can be utilized in addition to compensate respectively and amplify the data-signal that master control set and controlled device transmit, to increase distance and the degree of stability of data transmission.
Accompanying drawing explanation
Fig. 1: universal serial bus switch calcspar;
Fig. 2: the functional block diagram of the embodiment of universal serial bus switch provided by the invention;
Fig. 3: the circuit block diagram of the embodiment of universal serial bus switch provided by the invention; And
Fig. 4: the functional block diagram of the embodiment of another universal serial bus switch provided by the invention.
[main element symbol description]
1 universal serial bus switch
10 switch control chip
100 connectivity ports
102 Ultrahigh speed data passages
104 high-speed data channels
106 connectivity ports
2,2a universal serial bus switch
20a, 20b main signal compensating unit
200 transmit control units
2000 first balanced devices
2002 first amplifiers
202 reception control units
2020 second amplifiers
2022 second balanced devices
204 main signal transmission units
21 first switch units
210 transmit switch unit
212 receive switch unit
22 second switch units
23 device signal compensation unit
230 transfer management unit
2300 the 3rd balanced devices
2302 the 3rd amplifiers
232 receiving management unit
2320 the 4th amplifiers
2322 the 4th balanced devices
234 device signal transmission units
24 control modules
25 operating units
26a, 26b master control video interface unit
27 device video interface unit
28 video switch units
3 controlled devices
30 general serial bus connection ports
3a display device
32 video interface connectivity ports
4a-4d master control set
40 general serial bus connection ports
42 video interface connectivity ports
Embodiment
(universal serial bus switch embodiment)
Please refer to Fig. 2, Fig. 2 is the calcspar of a kind of universal serial bus switch embodiment provided by the invention.Universal serial bus switch 2 (hereinafter referred to as switch 2) in this example can connect multiple master control set 4a, 4b and a controlled device 3, so that master control set 4a and 4b is by the switching of switch 2, set up the access path with controlled device 3 respectively, with unit control controlled device 3.Switch 2 can comprise main signal compensating unit 20a and 20b, the first switch unit 21, second switch unit 22, device signal compensation unit 23, control module 24 and operating unit 25.Wherein, main signal compensating unit 20a is used for being electrically connected with master control set 4a, and main signal compensating unit 20b is used for being electrically connected with master control set 4b.Device signal compensation unit 23 is for being electrically connected with controlled device 3.First switch unit 21, second switch unit 22 and operating unit 25 are connected to control module 24.
Master control set 4a and 4b can be the host computer or other master control sets with general serial bus connection port 40, controlled device 3 can be the peripheral devices such as printer, display, keyboard or the mouse with general serial bus connection port 30 (being all called for short connectivity port below), or is multi-computer switch (KVM).
The connectivity port 30 and 40 of master control set 4a, 4b and controlled device 3 all can be the hypervelocity bus interface (also known as SuperSpeedUSB) meeting universal serial bus 3.0 release criteria, and described hypervelocity bus interface can comprise one group of frequency range and be about the Ultrahigh speed data passage (a pair Transfer pipe Tx and a pair receiving cable Rx) that the high-speed data channel (D+, D-) of 480M bit per second and two groups of frequency ranges be about 5G bit per second.In other words, the message transmission rate of Ultrahigh speed data passage about can be 10 times of high-speed data channel soon.For the ease of follow-up explanation, the data-signal that Ultrahigh speed data passage transmits is called the first data-signal in the present embodiment, and the data-signal that high-speed data channel transmits then is called the second data-signal.First data-signal then comprises the data signal sent via Transfer pipe Tx, and via the reception data-signal that receiving cable Rx receives.
The main signal compensating unit 20a of switch 2 comprises transmit control unit 200, reception control unit 202 and main signal transmission unit 204.Wherein, transmit control unit 200 is for controlling the data signal from master control set 40a, reception control unit 202 is for controlling the reception data-signal from controlled device 3, and main signal transmission unit 204 is then in order to control the transmission of the second data-signal between master control set 4a and controlled device 3 and reception.Also comprise the first balanced device (equalizer) 2000 and the first amplifier (pre-amplifier) 2002 in transmit control unit 200, reception control unit 202 also comprises the second amplifier 2020 and the second balanced device 2022.Similarly, main signal compensating unit 20b also comprises above-mentioned control module 200,202 and 204, and balanced device 2000,2020 as above and amplifier 2002,2022.Main signal compensating unit 20b in order to control from master control set 4b be sent to controlled device 3 data signal, send from controlled device 3 and the reception data-signal that received by master control set 4b, and the transmission of data signals transmitted between master control set 4b and controlled device 3.
Device signal compensation unit 23 comprises transmission processing unit 230 further, receives processing unit 232 and device signal transmission unit 234.Transmit processing unit 230 in order to process the data signal of master control set 4a or 4b transmission to be sent to controlled device 3, receive processing unit 232 in order to control to send and reception data-signal for being received by master control set 4a or 4b from controlled device 3, the second data-signal that device signal transmission unit 234 transmits between controlled device 3 and master control set 4a or 4b in order to process.
First switch unit 21 comprises transmission switch unit 210 and receives switch unit 212.First switch unit 21 is electrically connected at device signal compensation unit 23, and switch between main signal unit 20a, 20b according to the switching command that control module 24 produces, one of them making multiple main signal compensating unit 20a, 20b is connected to device signal compensation unit 23.Transmit switch unit 210 to select to be switched to one of them in the middle of the transmit control unit 200 of main signal compensating unit 20a and 20b according to identical switching command, use to be formed with the transmission processing unit 230 of device signal compensation unit 23 being electrically connected.Receive switch unit 212 to be electrically connected with the reception processing unit 232 of device signal compensation unit 23 in order to select to be switched to one of them in the middle of the reception control unit 202 of main signal compensating unit 20a and 20b.
Second switch unit 22 is in order in the middle of the main signal transmission unit 204 of main signal compensating unit 20a and 20b, select to be switched to one of them according to above-mentioned switching command, use and the main signal transmission unit 204 by selecting is electrically connected with the device signal transmission unit 234 of device signal compensation unit 23.
By the switching command that control module 24 produces, control the first switch unit 21 and the second switch unit 22 common choice and be switched to one of them main signal compensating unit (being such as 20a), make to be formed Ultrahigh speed data signalling channel and high-speed data signal passage by the main signal compensating unit 20a that selects and device signal compensation unit 23, and then make the master control set 4a that is connected with main signal compensating unit 20a by connectivity port 40 and can transmit by the controlled device 3 that connectivity port 30 is connected with device signal compensation unit 23 data-signal meeting universal serial bus 3.0 standard.Master control set 4a sends to the data-signal of controlled device 3 to be such as control command, controlled device 3 sends to the data-signal of master control set 4a can be then such as the signals such as the back-signalling to control command, or the input data operating controlled device 3 according to user and produce.
Continue referring to Fig. 2.Because Ultrahigh speed data signal is in the process transmitted, the HFS of signal is easy to distance because of transmission and rapid decay, cause the loss of data-signal, therefore when main signal compensating unit 20a, 20b receive the data signal from master control set 4a, 4b, first can be carried out the equilibrium of signal by the first balanced device 2000, high-frequency signal decay lost is compensated reply.In addition, in order to further guarantee the integrality of data signal and increase the distance transmitted of signal, the data signal crossed through the first balanced device 2000 equilibrium treatment also can be carried out the program of signal HFS amplification further in advance by the first amplifier 2002.
When utilizing balanced and after amplifying the data signal of transmit control unit 200 to be sent to transmission processing unit 230 via transmission switch unit 210, transmitting processing unit 230 can utilize the 3rd balanced device 2300 that data signal is carried out signal equalization once again, to compensate the HFS signal of decaying in transport process once again.Similarly, the data signal crossed through the 3rd balanced device 2300 equilibrium treatment is also further by the HFS in the 3rd amplifier 2302 in advance amplifying signal, and exporting from switch 2 the cause distance arriving controlled device 3 to prevent data signal increases and the signal attenuation that produces.
Otherwise, when receiving before data-signal arrives master control set 4a from the connectivity port 30 of controlled device 3 via device signal compensation unit 23, first switch unit 21, main signal compensating unit 20a, first by the 4th balanced device 2322 received in processing unit 232, the HFS that reception data-signal is decayed from the process that controlled device 3 sends can be compensated reply, and before the reception data-signal after equilibrium leaves from device signal compensation unit 23, then by the HFS of easily decaying in the 4th amplifier 2320 in advance amplifying signal.When through reception processing unit 232 process reception data-signal via the first switch unit 21 deliver to by select main signal compensating unit (still for 4a) time, the second balanced device 2022 is sequentially utilized to carry out signal equalization, and utilize the second amplifier 2020 amplifying signal medium-high frequency part in advance, then be sent to master control set 4a.
The second data-signal transmitted by high-speed data channel adopts semiduplex mode, use same passage transmission and receive data-signal, therefore no matter be the second data-signal sent from master control set 4a or 4b, all can export via the main signal transmission unit 204 in corresponding main signal compensating unit 20a or 20b, by the selection switching of the second switch unit 22 after passing the signal to device signal transmission unit 234, then output to controlled device 3.Relatively, when master control set 4a or 4b will receive the second data-signal sent from controlled device 3, then by identical channel path back transfer, until the second data-signal arrives master control set 4a or 4b corresponding to main signal compensating unit be electrically connected with the second switch unit 22.
By this, the switch 2 of the present embodiment can be originated after the signal that provides receiving signal, and before signal outputted to receiving end, the intensity of dual compensation and enhanced signal, with reduce data-signal error rate and extend signal transmission range outside, the present embodiment is the special transmission path processing Ultrahigh speed data with the first switch unit 21 also, and the transmission of high-speed data is specially processed with the second switch unit 22, efficiently can be apt to the data transmission channel with different frequency range, make the switching of data and transmit more efficient.
Wherein, first switch unit 21 can be and comprises that many groups are two transmits pin Tx (being respectively Tx+ and Tx-) and double reception pin Rx (being respectively Rx+ and Rx-) switches chip with the universal serial bus forming Ultrahigh speed data passage, and the second switch unit 22 can be universal sequential bus interface switching chip, it includes multi-group data transmission connecting-leg D+ and D-to form data channel.It is activation (enable) state that control module 24 can control to retain respectively in the first switch unit 21 and the second switch unit 22 one group of two transmission pin, double reception pin and one group of data transmission connecting-leg corresponding to same main signal compensating unit 20a or 20b, and the pin making other organize is anergy (disable) state, by this to reach the effect of one of them selecting and switch multiple main signal compensating unit.
In other examples, first switch unit 21 and the second switch unit 22 also can comprise switching control pin position (switchinputpin), and switch the current potential of control pin position according to control command conversion respectively and make the transmit control unit 200 of one of them main signal compensating unit be electrically connected at the first switch unit 21 with reception control unit 202, and one of them main signal transmission unit 204 is made to be electrically connected at the second switch unit 22.
The user of switch 2 can operate operating unit 25 with select master control set 4a or 4b that will be connected with controlled device 3.Operating unit 25 can be the device comprising one or more switch key, button or switch etc., the state of each main signal compensating unit 20a, 20b corresponding a kind of described button, button or switch, such as there are four buttons corresponding four main signal compensating units respectively, or the switch key of changeable three kinds of states, the means that its three kinds of corresponding three main signal compensating units of states difference etc. are similar.Control module 24 can according to operating unit 25 produced corresponding control command by one of them switch key, button or the switch selected, and and then control the first switch unit 21 and the second switch unit 22 synchronously switches.
Lift a particular instantiation, when user operate operating unit 25 with select be connected with master control set 2b main signal compensating unit 20b time, control module 24 produces control command according to the result chosen, control the transmission switch unit 210 of the first switch unit 21 and receive switch unit 212 and be electrically connected with the transmit control unit 200 of main signal compensating unit 20b and reception control unit 202 respectively, controlling the second switch unit 22 simultaneously and be electrically connected with the main signal transmission unit 204 corresponding to main signal compensating unit 20b.Making master control set 2b will issue the data-signal of controlled device 3 by this can be first balanced and after amplifying signal through main signal compensating unit 20b, the first switch unit 21 is utilized to transmit the first data-signal, and utilize the second switch unit 22 to transmit the second data-signal, then be sent to controlled device 3 by after device signal compensation unit 23 again equilibrium and amplifying signal.The data that controlled device 3 will send master control set 2b to then can follow identical path reverse transfer, and also successively balanced the and amplification to twice of data-signal through device signal compensation unit 23 and corresponding main signal compensating unit 20a or 20b, uses the distance increasing transmission and the degree of stability improving signal transmission.
Please refer to Fig. 3, Figure 3 shows that the circuit block diagram of the switch 2 of the present embodiment.Wherein, the first data-signal belonging to Ultrahigh speed data is switched by the first switch unit 21 by main signal compensating unit 20a and 20b, by transmitting, switch unit 210 controls the data signal Tx+ wherein sent from master control set and Tx-, reception data-signal Rx+ and Rx-that received by master control set controls by receiving switch unit 212, and the second data-signal D+ and D-belonging to high-speed data is switched by the second switch unit 22, and divide the transmission channel being performed foundation or interruption and controlled device by different switch units.Described switch unit be process be Ultrahigh speed data or high-speed data and divide, first switch unit 21 is special with the Ultrahigh speed data processing all main signal compensating unit 20a, 20b, second switch unit 22 is special with the high-speed data processing all main signal compensating unit 20a, 20b, to increase the efficiency of data processing.
Wherein, main signal compensating unit 20a, 20b and device signal compensation unit 23 any one all can be Universal serial bus concentrator (USBhub) or signal gain device (repeater), and when receiving data-signal all first by signal and with reform (reshape/retime), and again signal was amplified (amplify) in advance before exporting the data-signal after reforming.In other words, main signal compensating unit 20a, 20b and device signal compensation unit 23 can be passed through balanced device respectively and amplifier is reformed and amplifying signal, then data is exported respectively.
Referring again to Fig. 2.Be worth mentioning, when described signal compensation unit is Universal serial bus concentrator, because hub itself can enumerate the device that (emulate) connect, therefore sustainably the connectivity port 40 of master control set 4a and 4b is connected with main signal compensating unit 20a and 20b entity, and by main signal compensating unit 20a, 20b judges that whether master control set 4a or 4b formed with the first switch unit 21 and the second switch unit 22 and is electrically connected and can transmits data, do not need to rely on entity plug master control set to notify that switch 2 enumerates device, signal compensation unit compared to other types also has and prevents hardware unit from damaging and causing the effect that data are unstable or lose.
Special instruction, the present embodiment for convenience of explanation, therefore only illustrates two master control set 4a and 4b and two main signal compensating unit 20a and 20b.In fact main signal compensating unit more than two can be set according to demand, only need to make master control set can be connected to main signal compensating unit one to one, and the data signal of each main signal compensating unit is transferred to transmit switch unit 210 switch, receives data-signal transfer to reception switch unit 212 switch, and transfer to the second switch unit 22 to switch transmission of data signals, to set up correct data transmission channel according to the control of control module 23.
(another universal serial bus switch embodiment)
Refer to the calcspar of the another kind of switch embodiment that Fig. 4 illustrates.The switch 2a of the present embodiment is compared to the switch 2 shown in Fig. 2, further include master control video (video) interface unit 26a, 26b, device video interface unit 27, and video switch unit 28, use and make described switch 2a can be used as multi-computer switch (KVMswitch).Master control video interface unit 26a and 26b is respectively in order to be electrically connected the video interface connectivity port 42 of master control set 4c and 4d, and device video interface unit 27 is then in order to be electrically connected the video interface connectivity port 32 of display device 3a.Video switch unit 28 is electrically connected respectively with master control video interface unit 26a, 26b and device video interface unit 27, and according to the control of control module 24, switch between master control video interface unit 26a, 26b, be electrically connected to make master control video interface unit 26a and 26b one of them and device video interface unit 27 be formed.By this, master control set 4c and 4d one of them can utilize the switching of switch 2a and output video data to display device 3a.
Control module 24 operates according to user the instruction that operating unit 25 produces, the first switch unit 21, second switch unit 22 and video switch unit 28 synchronism switching can be controlled to the main signal compensating unit 20a and the master control video interface unit 26a that correspond to same master control set (as 4c), for master control set 4c by general serial bus connection port 40 and controlled device 3 transmission of data signals, and by video interface connectivity port 42 and display device 3a transmitting video data.
Video interface connectivity port 32,42 described in the present embodiment can be the connectivity port of the interfaces such as Video Graphics Array (VGA) interface, digital visual interface (DVI), high resolution multimedia interface (HDMI) or display port (DP), and master control video interface linkage unit 26a, the 26b in switch 2a and device video interface unit 27 are then the interface connection port corresponding to video interface connectivity port 32,42.In addition, described video switch unit 28 can the circuit chip such as video integrated circuit (videoIC) chip, Application Specific Integrated Circuit (ASIC) chip or field domain programmable array (FPGA) chip in addition implementation form.
(the possible effect of embodiment)
According to the embodiment of the present invention, the Ultrahigh speed data that multiple master control set can transmit by above-mentioned universal serial bus switch and high-speed data divide by different switch unit process, intrinsic high speed switching chip (as meeting the switching control chip of universal sequential bus interface 2.0 standard) can in order to process the switching of high-speed data, and the Ultrahigh speed data another selection switching control chip control data passage with hypervelocity again.Can reduce by this and switch the pin position magnitude setting of chip, area that breviaty switches chip and reduce the production cost of switch, and promote the treatment effeciency to data.
And in the switch of the embodiment of the present invention, be provided with multiple signal compensation unit, in order to be connected with multiple master control set one to one, and also signalization compensating unit is to connect controlled device, can effectively the data-signal that master control set and controlled device transmit be reformed, be compensated and be amplified, use loss and mistake that repair signal produces in transmittance process, what extend signal can transmission range, and increases the degree of stability of order or data.In addition, when utilizing Universal serial bus concentrator as compensating unit, master control set also sustainable entity is connected to switch, master control set is enumerated by hub, therefore do not need the action often master control set and switch carried out to entity connection or remove, the connectivity port circuit that can reduce master control set and switch produces the probability of wearing and tearing.
In addition, according to embodiments of the invention, described switch also can be further used as multi-computer switch, reaches switching and the transmission of other data beyond video data and video simultaneously.
The foregoing is only embodiments of the invention, it is also not used to limit to the scope of the claims of the present invention.
Claims (10)
1. a universal serial bus switch, in order to switch path between at least one master control set and controlled device to transmit the first data-signal and the second data-signal, it is characterized in that, wherein said master control set supports the output of described first data-signal and described second data-signal, described first data-signal is the signal of Ultrahigh speed data passage, and described second data-signal is the signal of high-speed data channel, described switch comprises:
First switch unit, described first switch unit is that the hypervelocity universal serial bus meeting universal serial bus 3.0 version specification switches chip;
Second switch unit, described second switch unit is that the High Speed General serial bus meeting universal serial bus 2.0 version specification switches chip;
Multiple main signal compensating unit, for being electrically connected described master control set one to one, and described first data-signal that receives of equilibrium and amplifying by described first data-signal of equilibrium, main signal compensating unit described in each comprises a main signal transmission unit, the transmission of described main signal transmission unit and reception are from this master control set or this second data-signal from this controlled device, and main signal compensating unit described in each is a Universal serial bus concentrator or a signal gain device; And
Device signal compensation unit, for being electrically connected described controlled device, and described first data-signal that receives of equilibrium and amplifying by described first data-signal of equilibrium, described device signal compensation unit comprises a device signal transmission unit, the transmission of described device signal transmission unit and described second data-signal received from described master control set or described controlled device, and described device signal compensation unit is Universal serial bus concentrator or signal gain device;
Wherein, described first switch unit and described second switch unit are in order to be electrically connected described device signal compensation unit, and be electrically connected one of them of described multiple main signal compensating unit according to switching command, wherein, described first switch unit in order to transmit described first data-signal between described device signal compensation unit and the described main signal compensating unit that is electrically connected according to described switching command, described second switch unit in order to transmit described second data-signal between described device signal compensation unit and the described main signal compensating unit that is electrically connected according to described switching command.
2. switch according to claim 1, is characterized in that, described in each, main signal compensating unit comprises:
Transmit control unit, comprises the first balanced device and the first amplifier;
Reception control unit, comprises the second balanced device and the second amplifier; And
Wherein, described first data-signal comprises data signal that described master control set sends and the reception data-signal that described controlled device sends, described data signal is sent to described transmit control unit, and carry out signal equalization by described first balanced device, and amplified by the described data signal of equilibrium by described first amplifier, described reception data-signal is sent to described reception control unit, and carry out signal equalization by described second balanced device, and amplified by the described reception data-signal of equilibrium to be sent to described master control set by described second amplifier.
3. switch according to claim 2, is characterized in that, described first switch unit comprises:
Transmit switch unit, control described device signal compensation unit according to described switching command and be electrically connected one of them of described transmit control unit, be delivered to described device signal compensation unit in order to the described data signal of being amplified by the described transmit control unit be electrically connected according to described switching command; And
Receive switch unit, control described device signal compensation unit according to described switching command and be electrically connected one of them of described reception control unit, in order to described reception data-signal is sent to the described reception control unit that is electrically connected according to described switching command to carry out signal equalization.
4. switch according to claim 3, is characterized in that, described device signal compensation unit comprises:
Transmit processing unit, comprise the 3rd balanced device and the 3rd amplifier, described 3rd balanced device is in order to the described data signal received and balanced described transmission switch unit transmits, described 3rd amplifier in order to amplify the described data signal of described 3rd balanced device equilibrium, to output to described controlled device;
Receive processing unit, comprise the 4th balanced device and the 4th amplifier, described 4th balanced device is in order to the described reception data-signal of equilibrium from described controlled device, and amplified the described reception data-signal of described 4th balanced device equilibrium by described 4th amplifier, to be sent to described reception switch unit.
5. switch according to claim 1, is characterized in that, described switch also comprises:
Control module, is coupled to described first switch unit and described second switch unit, for generation of described switching command.
6. switch according to claim 4, is characterized in that, described switch also comprises:
Operating unit, operates to select one of them of described main signal compensating unit for accepting;
Wherein, described control module produces described switching command according to the described main signal compensating unit corresponding to the described master control set selected, and controls described first switch unit and described second switch unit and be electrically connected described main signal compensating unit selected by described switching command respectively.
7. switch according to claim 1, is characterized in that, described controlled device is printer, display, keyboard, mouse or multi-computer switch.
8. switch according to claim 1, it is characterized in that, described master control set comprises general serial bus connection port, in order to be electrically connected described main signal compensating unit to form the transmission channel of described first data-signal and described second data-signal.
9. switch according to claim 1, it is characterized in that, described controlled device comprises general serial bus connection port, in order to be electrically connected described device signal compensation unit to form the transmission channel of described first data-signal and described second data-signal.
10. switch according to claim 1, is characterized in that, described switch also comprises:
Video switch unit;
Multiple master control video interface unit, respectively in order to be electrically connected with described master control set; And
Device video interface unit, in order to be electrically connected with display device;
Wherein, described video switch unit is in order to be electrically connected described device video interface unit, and be electrically connected one of them of described multiple master control video interface unit according to described switching command, with transmitting video data between described device video interface unit and the described master control video interface unit that is electrically connected according to described switching command to described display device.
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