WO2016197594A2 - 带切换装置的kvm延长器接收端 - Google Patents

带切换装置的kvm延长器接收端 Download PDF

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Publication number
WO2016197594A2
WO2016197594A2 PCT/CN2016/000297 CN2016000297W WO2016197594A2 WO 2016197594 A2 WO2016197594 A2 WO 2016197594A2 CN 2016000297 W CN2016000297 W CN 2016000297W WO 2016197594 A2 WO2016197594 A2 WO 2016197594A2
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WO
WIPO (PCT)
Prior art keywords
mouse
keyboard
kvm extender
input
switching device
Prior art date
Application number
PCT/CN2016/000297
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English (en)
French (fr)
Other versions
WO2016197594A3 (zh
Inventor
周立刚
Original Assignee
周立刚
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201510562768.2A external-priority patent/CN105302334B/zh
Application filed by 周立刚 filed Critical 周立刚
Priority to AU2016275811A priority Critical patent/AU2016275811A1/en
Publication of WO2016197594A2 publication Critical patent/WO2016197594A2/zh
Publication of WO2016197594A3 publication Critical patent/WO2016197594A3/zh
Priority to US15/835,394 priority patent/US10838511B2/en
Priority to AU2020200822A priority patent/AU2020200822B2/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
    • G06F3/0227—Cooperation and interconnection of the input arrangement with other functional units of a computer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03543—Mice or pucks
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2358/00—Arrangements for display data security
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/02—Networking aspects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/02—Networking aspects
    • G09G2370/027—Arrangements and methods specific for the display of internet documents
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/24—Keyboard-Video-Mouse [KVM] switch

Definitions

  • the invention relates to a KVM extender receiving end with a switching device, and belongs to the technical field of electronic devices.
  • a first aspect of the present invention provides a KVM extender receiving end with a switching device, comprising: a video decoder, a mouse and keyboard encoder and a switching device, wherein an input end of the video decoder is connected to the switching device, and the mouse and keyboard encoder The output is connected to the switching device.
  • a second aspect of the present invention provides a computer motherboard characterized by comprising a KVM extender transmitting end, a video signal input end of a KVM extender transmitting end is connected to a video output end of the computer motherboard, and a mouse and keyboard signal output of a KVM extender transmitting end The end is connected to the mouse and keyboard input of the computer motherboard.
  • a third aspect of the present invention provides a computer, comprising: a KVM extender receiving end, a mouse and keyboard signal input end of the KVM extender receiving end is connected to a mouse and keyboard output end of the computer motherboard, and a video of the KVM extender receiving end The output is coupled to the display of the computer.
  • a fourth aspect of the present invention provides a computer system, comprising: a main board, at least one plug-in KVM extender transmitting end, the plug-in KVM extender transmitting end includes a video signal output port and a mouse and keyboard input a receiving port, the plug-in KVM extender transmitting end is inserted on the main board.
  • a second aspect of the invention provides a
  • a fifth aspect of the present invention provides a method for operating a transmitting end of a KVM extender, including:
  • the KVM extender transmitting end receives the desktop code of the virtual terminal
  • the KVM extender transmitting end transmits the equal-amplitude differential signal to the KVM extender receiving end.
  • a sixth aspect of the present invention provides a KVM extender transmitting end, characterized in that the input end of a single KVM extender transmitting end is connected to a communication port with a MAC address.
  • a seventh aspect of the present invention provides a method for transmitting a virtual terminal by using a MAC address communication port, wherein the KVM extender transmitting end receives a desktop code of the virtual terminal, including: the KVM extender transmitting end from the The communication port with the MAC address corresponding to the transmitter end of the KVM extender receives the desktop code of the virtual terminal.
  • the technical solution of the present invention comprises a video decoder, a mouse and keyboard encoder and a switching device.
  • the input end of the video decoder is connected to the switching device, and the output end of the mouse and keyboard encoder is connected to the switching device.
  • the advantages of the invention completely separate the local area network and the Internet, not only can prevent hacker attacks, but also effectively prevent internal personnel network leakage, and can also put two units in the computer room, away from the personal office, for each Office workers save a lot of office space.
  • Embodiment 1 is a network configuration diagram described in Embodiment 1 of the present invention.
  • Figure 2 is a structural view described in Embodiment 1 of the present invention.
  • Figure 3 is a structural view described in Embodiment 2 of the present invention.
  • Embodiment 4 is a network configuration diagram described in Embodiment 3 of the present invention.
  • Figure 5 is a structural view described in Embodiment 3 of the present invention.
  • Figure 6 is a method.
  • Figure 7 is a method.
  • 1 is the mouse
  • 2 is the keyboard
  • 3 is the display
  • 4 is the KVM extender receiving end with switching device
  • 5 is the computer
  • 6 is the KVM extender transmitting end
  • 7 is the router
  • 8 is the Internet
  • 9 is the switch 10 is a switching device
  • 11 is a video decoder
  • 12 is a mouse and keyboard encoder
  • 13 is a computer mouse input port
  • 14 is a computer keyboard input port
  • 15 is a computer video output port
  • 16 is an extension cable connection port.
  • 17 is the ordinary KVM extender receiver
  • 18 is the toggle button
  • 19 is the communication port with the MAC address.
  • the KVM extender receiving end 4 with switching means is composed of a switching device 10, a video decoder 11, and a mouse and keyboard encoder 12.
  • the first signal output/input terminal of the switching device 10 is connected to the first signal input/output terminal of the video decoder 11; the second signal output/input terminal of the switching device 10 is connected to the KVM extender transmitting terminal 6, and the video decoder 11
  • the second signal output/input is connected to the display, and the second signal output/input of the mouse and keyboard encoder 12 is connected to the mouse, and the mouse and keyboard are programmed.
  • the third signal output/input of the encoder 12 is connected to the keyboard.
  • Switching device 10 After two extension lines are connected to the switching device 10, the switching device 10 can automatically switch between the manual or the mouse and keyboard, and connect the extension cable to the video decoder 11, and only one extension line and video decoder can be connected at the same time. 11 connection, extension cable can be twisted pair, HDMI cable, etc., commonly used is twisted pair. Both extension lines are connected to the switching device 10.
  • the manual switching mode refers to a manual button that manually twists the switching device 10, and the video decoder is connected to a particular KVM extender transmitting end 6 via an extension cable.
  • the line connecting the KVM extender transmitter to the KVM extender receiver is called an extension cable.
  • the common extension cable is a twisted pair. There are four pairs of wires in each twisted pair, three of which are connected to the output of the video decoder.
  • a pair of wires is connected to the input end of the mouse and keyboard encoder and the output of the switch, the output end of the switch is connected to a display by a video cable, and the switch input is connected to the mouse by two connecting wires respectively.
  • the display, mouse, and keyboard can only be connected to a set of video decoders and mouse and keyboard encoders through the switch.
  • the device for switching two extension lines is called an extension line switch, and is divided into different switches according to different extension lines, such as a twisted pair switch, an HDMI switch, and the like.
  • the switching principle of the switching device is as follows, taking the twisted pair as an example:
  • Both twisted pairs are connected to the switching device;
  • the switching device only connects one twisted pair to other devices.
  • Video Decoder 11 Corresponding to the video signal encoder of the KVM extender transmitter 6, the signal transmitted by the KVM extender transmitter 6 can be decoded.
  • the video decoder 11 receives the video signal sent by the KVM extender transmitting end 6, decodes it and sends it to the display for display.
  • Mouse and keyboard encoder 12 It is connected to the mouse and keyboard, encodes the signal of the mouse and keyboard, and then sends the signal out.
  • the currently used transmission shape between the mouse and keyboard encoder and the mouse and keyboard encoder The formula is an RS-485 communication link.
  • KVM Extender Transmitter 6 There is a video signal encoder and a mouse and keyboard decoder.
  • the function of the video signal encoder is to convert the video signal into a differential signal and then transmit it over a long distance by twisted pair; our common extension cable is a twisted pair, and the twisted pair has 8 data lines, of which six are used to transmit video signals.
  • the other two signals for transmitting the mouse and keyboard, the transmission medium can also be an HDMI cable, etc. If such a medium is used, the encoder and decoder at both ends also become corresponding encoders and decoders. Now the encoder can also convert the signal into other formats, as long as the data is transmitted, the video decoder will decode it accordingly.
  • the function of the mouse and keyboard decoder is to receive the mouse and keyboard signals sent by the mouse and keyboard encoder, and then decode these signals and send them to the host computer.
  • a mouse and keyboard decoder that decodes the signal sent by the mouse and keyboard encoder and sends it to the computer.
  • the switching device can be connected to the KVM extender transmitter in either wired or wireless mode.
  • the video signal input end of the KVM extender transmitting end is connected to the video output end of the main board
  • the mouse and keyboard signal output end of the KVM extender transmitting end is connected with the mouse keyboard input end
  • the video encoder of the KVM extender transmitting end is connected to the video input signal input end.
  • the input video signal is encoded, and the mouse and keyboard decoder at the transmitting end of the KVM extender decodes the signal input from the mouse and keyboard signal input terminal of the KVM extender transmitter.
  • the KVM extender receiver can be integrated on the computer as follows:
  • the video signal output end of the KVM extender receiving end is connected to the input end of the display, and the mouse and keyboard signal input end of the KVM extender receiving end is connected with the mouse and keyboard output end, and the KVM extender receiving end is connected.
  • the video decoder decodes the video signal input by the video input signal input end, and the mouse and keyboard encoder of the KVM extender receiving end encodes the signal input by the mouse and keyboard signal input end of the KVM extender receiving end.
  • the invention has various embodiments, which are as follows:
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the two ports of the KVM extender receiver switch are respectively connected to the transmitter end of the KVM extender through extension lines, and the other end of each KVM extender is connected to a computer mouse port, keyboard port, display Port, each computer host is connected to a different LAN.
  • the unit has two sets of networks, one set is the internal network, one set is the external network, and the end user uses the switcher to select a network.
  • the two remote computer hosts are respectively connected to a KVM extender transmitter 6 by connecting the video output port of the computer to the video input port of the KVM extender transmitter 6 and the computer's mouse input port to the KVM.
  • the mouse output port of the extender transmitter 6 is connected to the keyboard output port of the KVM extender transmitter 6 of the computer.
  • the component switching device 10 of the KVM extender receiving terminal 4 with the switching device connects the different extension lines to the video decoder 11 as needed.
  • the video decoder 11 decodes the received video signal and assigns the signal to the display 3 connected thereto.
  • the mouse and keyboard encoder 12 converts the signals of the mouse 1 and the keyboard 2, and sends it to Corresponding KVM extender transmitter 6, KVM extender transmitter 6 decodes the signal and sends it to the corresponding computer.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the switch has a mouse and keyboard display switcher and two KVM extender receivers, each of which uses a mouse cable, a keyboard cable, and a video cable to connect the switch.
  • the receiving ends of the two KVM extenders receive the video signal and the decoded video signal respectively, and then send them to the switcher.
  • the terminal user displays the video signals from the receiving ends of different KVM extenders as needed, at the same time.
  • the display can only display video signals from the receiving end of a KVM extender and send the signals from the mouse and keyboard to the computer.
  • One end of the switch is connected to the display, mouse and keyboard.
  • the other two ports are connected to the KVM extender transmitter through the extension cable.
  • the other end of each KVM extender transmitter is connected to a computer.
  • the connection method is connected by a cable.
  • the computer's mouse, keyboard, display, each computer host connected to a different local area network;
  • the two remote computer hosts are respectively connected to a KVM extender transmitter 6 by connecting the video output port of the computer to the video input port of the KVM extender transmitter 6, and the computer's mouse input port is connected to the KVM.
  • a mouse output port of the extender transmitting end 6 the keyboard input port of the computer is connected to the keyboard output port of the KVM extender transmitting end 6;
  • the switching device 10 automatically or manually sends the video signal to the display and sends the mouse and keyboard signals to the computer.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the utility model comprises a KVM extender receiving end and a switching device, wherein the switching device has a first input output end, a second input output end and a third input output end, wherein the first input output end is a first connector socket for connecting a first extension line, which is a connection line connecting the KVM extender transmitting end and the KVM extender receiving end, wherein the second input and output end is a mouse keyboard output end and a video input end, and is used for connecting a computer mouse and keyboard input And a video output end, the third input and output end is a keyboard mouse input end and a video output end, and is used for connecting a mouse and keyboard display, wherein the switching device is configured to connect the first extension line to the video decoder and the first An extension cord is coupled to the mouse and keyboard encoder, or the mouse and keyboard input of the computer is coupled to the mouse keyboard and the video output is coupled to the display.
  • the company already has a local area network, and for the sake of information security, another set of network systems is established.
  • the user's work steps are:
  • FIG. 5 it is a structural diagram of a switch.
  • the mouse and keyboard of the computer each have four connecting lines, two are power lines, two are data lines, and a common VGA signal line interface has fifteen pins.
  • 6 wires are: red, green, blue, line sync, field sync, ground line; the extension port has 8 connection lines.
  • the switch button is pushed to the mouse input port, keyboard input port, display output port, mouse, keyboard, display and computer host connection, you can control the local computer.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the switching device is separated from the KVM extender receiving terminal to construct the network described in FIG. 1.
  • the KVM extender receiving terminal includes a video decoder and a mouse and keyboard encoder.
  • Embodiment 5 Working method of a KVM extender transmitting end
  • the KVM extender transmitting end receives the desktop code of the virtual terminal
  • the KVM extender transmitter converts the code into a differential signal
  • the KVM extender transmitter transmits the differential signal to a KVM extender receiver.
  • the differential signal is a differential signal suitable for differential transmission.
  • the KVM extender transmitter is in the form of a card, including a video encoder, a mouse and keyboard decoder, and a card pin for inserting the KVM extender transmitter into the computer motherboard. It plugs directly into the computer.
  • This card has a port that uses a twisted pair to output video signals and receive keyboard and mouse signals.
  • Each computer has one or more such cards.
  • the virtual terminal is transmitted by the KVM extender transmitting end. Since the video encoder of the KVM extender transmitting end and the video decoder of the KVM extender transmitting end are transmitting video signals, the data file cannot be transmitted, so the user cannot Copying data to the KVM extender receiver on the computer host effectively protects the security of the data.
  • the virtual terminal X is any one of the following virtual terminals.
  • a multi-type virtual terminal includes a multi-type virtual terminal Q and a multi-type virtual terminal W:
  • a multi-type virtual terminal Q establish a computer user in a PC, or run a software to establish a user, assign an initial desktop to the user, and send the user's desktop to a KVM extender transmitter A
  • the video encoder, the mouse and keyboard signal on the user's desktop comes from the mouse and keyboard decoder at the KVM extender's transmitter.
  • a multi-type virtual terminal W a window P is built in a PC, and one or more applications are embedded in the window P, and the contents displayed in the window P and the window P are sent to a KVM extender transmitter A.
  • the video encoder, the mouse and keyboard signals on the window come from the KVM extender transmitter A.
  • the desktop of a plurality of types of virtual terminals W is the content displayed in the window P and the window P.
  • Cloud server client On the server, create a user, assign an operating system to the user, and then assign the processor, memory, and hard disk to the user. We call such a user a cloud server client.
  • the server described is a cloud server.
  • the mouse and keyboard signals of the cloud server's client come from the mouse and keyboard decoder on the KVM extender's transmitter.
  • a KVM extender transmitter is made into a card.
  • This card has a port that uses a twisted pair to output video signals and receive keyboard and mouse signals.
  • the processor of the computer continuously sends the desktop of the virtual terminal X to the video encoder of the transmitting end A of the KVM extender;
  • the video encoder of the transmitter A of the KVM extender encodes the received signal and transmits it;
  • the video signal After receiving the signal from the video decoder of the receiving end of the KVM extender, the video signal is decoded, and then the signal is sent to the display, and the image is displayed on the display;
  • KVM extender Receiver B mouse and keyboard encoder receives the mouse and keyboard signal immediately after encoding, and sends out;
  • the mouse and keyboard decoder of the KVM extender transmitting end A receives the mouse and keyboard signal sent by the mouse and keyboard encoder of the receiving end of the KVM extender, decodes it, sends it to the virtual terminal X, and limits the mouse and keyboard input signals only to the virtual Terminal X;
  • the virtual terminal X receives the mouse and keyboard signals and performs corresponding operations, and if the related operation causes any change of the screen, it is immediately displayed on the desktop of the terminal X.
  • Embodiment 6 Method for transmitting virtual terminal by communication port with MAC address
  • a single KVM extender transmitter is connected to a communication port with a MAC address, and a communication port with a MAC address is connected to the switch.
  • the first method is to connect the communication port to a switch port, and the second method is to exchange the communication port to the switch. chip.
  • a communication port with a MAC address can send the desktop of a virtual terminal to the KVM extender transmitter that is directly connected to the communication port with the MAC address.
  • the virtual terminal is sent out by the KVM extender transmitting end, and the user can operate the virtual terminal normally.
  • Video encoder due to the KVM extender transmitter and video decoder at the KVM extender transmitter The video signal is transmitted between the two, so that the data file cannot be transmitted, so that the user cannot copy data from the host computer to the receiving end of the KVM extender, which effectively protects the data security.
  • the virtual terminal X is any one of the following virtual terminals.
  • One-to-many type of virtual terminal multiple people can use one PC at the same time and independently, each user has its own display, keyboard and mouse. Users can share the hardware, software and peripheral resources of a PC computer at the same time; including a multi-type virtual terminal Q and a multi-type virtual terminal W.
  • a multi-type virtual terminal Q a computer user is established in a PC, or a software R is run and a user is created, an initial desktop is assigned to the user, and the user's desktop is sent to the software M.
  • the mouse and keyboard signals on the user's desktop come from software M.
  • a multi-type virtual terminal W in a PC, running a software R and creating a window P, the window P can embed one or more applications, and send the contents displayed in the window P and the window P to Software M, the mouse and keyboard signals acting on the user's window come from software M.
  • the desktop of a plurality of types of virtual terminals W is the content displayed in the window P and the window P.
  • Cloud server client On the server, run a software R, create a user, assign an operating system to the user, and then assign the processor, memory, and hard disk to the user.
  • Client the server is a cloud server.
  • the mouse and keyboard signals of the cloud server's client come from software M.
  • the software M is a program on a computer which can be used as a subroutine of the software R.
  • the KVM extender transmitting end receives the desktop code of the virtual terminal from the communication port with the MAC address corresponding to the transmitting end of the KVM extender.
  • the computer is connected to a switch A by a network cable;
  • the first input and output of the port with the MAC address is connected to the transmitter of the KVM extender, the second input and output of the communication port is connected to a switch port, or the communication port is connected to the switch chip of the switch;
  • Memory, memory and motherboard, the processor, memory, memory and motherboard can support the operation of the Android operating system.
  • the computer and the measurement and control device agree on a set of data transmission format and communication port number.
  • the socket communication port used by the computer to send data to the KVM extender transmitter is 4888, and the socket communication port used by the KVM extender transmitter to send data to the computer is 1888. For 4889;
  • IP address of the computer is set to 192.168.1.1;
  • the KVM extender transmitter runs an Android operating system with a TCP/IP protocol stack; the communication port B is set to an IP address of 192.168.1.30;
  • Communication port B sends the received signal to the KVM extender transmitter
  • the KVM extender transmits a software Y, and the software Y decodes the received data packet according to a set of data transmission formats agreed by the computer and the measurement and control device to obtain the video encoding of the virtual terminal X; then, the virtual terminal X Encoding a video encoder that is sent to the transmitter C of the KVM extender;
  • KVM extender transmitter C video encoder to the received interface into a differential signal, sent to the KVM extender receiver D;
  • the receiving end D of the KVM extender After receiving the signal, the receiving end D of the KVM extender decodes the signal and then sends the signal to the display;
  • the mouse and keyboard encoder of the receiving end D of the KVM extender is encoded immediately after receiving the mouse and keyboard signal, and is sent out;
  • the mouse and keyboard decoder of the KVM extender transmitting end C receives the mouse and keyboard signals sent from a remote place and decodes them, and converts them into a mouse and keyboard signal.
  • the software Y reads the mouse and keyboard signals and puts the signals into a data packet, the data The report is sent to the computer through the communication port B with the MAC address;
  • the software M decodes the datagram to obtain a mouse and keyboard signal, and the mouse and keyboard signals are limited to be applied to the desktop of the virtual terminal X; the virtual terminal X receives the mouse and keyboard signals and performs corresponding operations, and the related operations are caused by There are any changes to the screen that the user can see immediately on the display.
  • a KVM extender receiving end with a switching device is placed under the user's desk;
  • the first network system is an internal office network system. Completely isolated from the Internet;
  • the second set of network systems is a network system that accesses the Internet and is connected to the Internet;
  • Two sets of networks each provide a computer, which is respectively connected to a KVM extender transmitting end 6, and the KVM extender transmitting end 6 is connected to the user's KVM extender receiving end with a twisting pair by twisted pair.
  • the switching device connects the video decoder 11 at the receiving end of the KVM extender to different extension lines. Since each extension cable is connected to one KVM extender transmitting end 6, each KVM extender transmitting end 6 is connected to one. A computer host so that users can freely access the Internet or the internal office network.

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  • General Engineering & Computer Science (AREA)
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  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Hardware Design (AREA)
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Abstract

本发明是带切换装置的延长器KVM接收端，其特征是包括视频解码器、鼠标键盘编码器和切换装置，视频解码器的输入端与切换装置连接，鼠标键盘编码器的输出端与切换装置连接。优点：将单位里的局域网和互联网完全分开，不但能防止黑客攻击，而且能有效的防治了内部人员网络泄密，并且还能把两台放在机房，远离个人的办公地点，为每个办公人员节省了大量的办公空间。

Description

带切换装置的KVM延长器接收端 技术领域
本发明涉及的是带切换装置的KVM延长器接收端，属于电子设备技术领域。
背景技术
现在的很多重要的单位都安装了两套计算机网络，一套是内网，是内部办公网络，一套是外网，连接互联网，这两种方式给人们的生活带来了极大的方便，信息安全水平也得到了极大的提高。但是也有美中不足的地方，内部人员可以通过交叉网线，把信息泄露出去，给单位造成了许多不可估量的损失，并且两台计算机主机放在办公桌下面，占用了宝贵的个人工作空间，给日常工作带来了很多的烦恼。
发明内容
由于延长器发射端与延长器接收端之间使用差分传输技术，我们利用这个特性来解决用户的信息安全问题。
本发明的第一方面提供一种带切换装置的KVM延长器接收端，其特征是包括视频解码器、鼠标键盘编码器和切换装置，视频解码器的输入端与切换装置连接，鼠标键盘编码器的输出端与切换装置连接。
本发明的第二方面提供一种计算机主板特征在于，包括KVM延长器发射端，KVM延长器发射端的视频信号输入端与所述计算机主板的视频输出端连接，KVM延长器发射端的鼠标键盘信号输出端与所述计算机主板的鼠标键盘输入端连接。
本发明的第三方面提供一种计算机，其特征在于，包括KVM延长器接收端，KVM延长器接收端的鼠标键盘信号输入端与所述计算机主板的鼠标键盘输出端连接，KVM延长器接收端的视频输出端与所述计算机的显示器连接。
本发明的第四方面提供一种计算机系统，其特征在于，包括：主板，至少一个插卡式KVM延长器发射端，所述插卡式KVM延长器发射端包括视频信号输出端口和鼠标键盘输入接收端口，所述插卡式KVM延长器发射端插在所述主板上。本发明的第二方面提供一种
本发明的第五方面提供一种KVM延长器发射端的工作方法，其特征在于，包括：
KVM延长器发射端接收虚拟终端的桌面编码；
所述KVM延长器发射端将所述桌面编码转换成等幅等长的差分信号；
所述KVM延长器发射端向KVM延长器接收端发送所述等幅等长的差分信号。
本发明的第六方面提供一种KVM延长器发射端，其特征是单个KVM延长器发射端的输入端连接一个带MAC地址的通讯端口。
本发明的第七方面提供一种带MAC地址的通讯端口传输虚拟终端的方法，其特征在于，所述KVM延长器发射端接收虚拟终端的桌面编码，包括：所述KVM延长器发射端从该KVM延长器发射端对应的带MAC地址的通讯端口接收虚拟终端的桌面编码。
本发明的技术解决方案：包括视频解码器、鼠标键盘编码器和切换装置，视频解码器的输入端与切换装置连接，鼠标键盘编码器的输出端与切换装置连接。
本发明的优点：将单位里的局域网和互联网完全分开，不但能防止黑客攻击，而且能有效的防治了内部人员网络泄密，并且还能把两台放在机房，远离个人的办公地点，为每个办公人员节省了大量的办公空间。
附图说明
附图1是本发明的实施方式1所描述的网络结构图。
附图2是本发明的实施方式1所描述的结构图。
附图3是本发明的实施方式2所描述的结构图。
附图4是本发明的实施方式3所描述的网络结构图。
附图5是本发明的实施方式3所描述的结构图。
附图6是一种方法。
附图7是一种方法。
图中的1是鼠标，2是键盘，3是显示器，4是带切换装置的KVM延长器接收端，5是计算机，6是KVM延长器发射端，7是路由器，8是互联网，9是交换机，10是切换装置，11是视频解码器，12是鼠标键盘编码器，13是计算机的鼠标输入端口，14是计算机的键盘输入端口，15是计算机的视频输出端口，16是延长线连接端口，17是普通的KVM延长器接收端，18是切换按钮，19是带MAC地址的通讯端口。
具体实施方式
对照图2，带切换装置的KVM延长器接收端4由切换装置10、视频解码器11和鼠标键盘编码器12组成。其中切换装置10的第一信号输出/输入端连接视频解码器11的第一信号输入/输出端；切换装置10的第二信号输出/输入端连接KVM延长器发射端6，视频解码器11第二信号输出/输入端连接显示器，鼠标键盘编码器12的第二信号输出/输入端连接鼠标，鼠标键盘编 码器12的第三信号输出/输入端连接键盘。
切换装置10：两根延长线连接切换装置10后，切换装置10可以手动或通过鼠标键盘控制自动切换，将延长线与视频解码器11连接，同一时间只能由一根延长线与视频解码器11连接，延长线可以是双绞线、HDMI线等，常用的是双绞线。两根延长线都与切换装置10相连，手动切换模式是指人工扭动切换装置10的手动按钮，视频解码器通过延长线连接到特定的KVM延长器发射端6。
连接KVM延长器发射端和KVM延长器接收端的线称作延长线，常用的延长线是双绞线，每根双绞线中有四对线，其中3对线连接视频解码器的输出端和切换器的输入端，一对线连接鼠标键盘编码器的输入端和切换器的输出端，切换器的输出端用一根视频线连接一个显示器，切换器输入端用两根连接线分别连接鼠标和键盘的，同一个时间，显示器、鼠标、键盘只能通过切换器与一组视频解码器和鼠标键盘编码器连接。
对两根延长线进行切换的装置叫延长线切换器，根据延长线的不同，分为不同的切换器，如双绞线切换器、HDMI切换器等等。
切换装置的切换原理如下，以双绞线举例：
1、两根双绞线都与切换装置相连；
2、在同一个时间，切换装置只将一根双绞线与其它的设备连接。
视频解码器11：与KVM延长器发射端6的视频信号编码器对应，能够将KVM延长器发射端6发送的信号解码出来。视频解码器11接收KVM延长器发射端6发送过来的视频信号，解码后发送给显示器，显示出来。
鼠标键盘编码器12：它与鼠标键盘连接，将鼠标键盘的信号编码，然后把信号发送出去。鼠标键盘编码器与鼠标键盘编码器之间目前常用的传输形 式是RS-485通信链路。
KVM延长器发射端6：有一个视频信号编码器和一个鼠标键盘解码器。
视频信号编码器的功能是把视频信号转换成差分信号，然后用双绞线远距离传输；我们常用延长线是双绞线，双绞线有8根数据线，其中六根用于传输视频信号，另外的两根用于传输鼠标、键盘的信号，传输介质也可以是HDMI线等，如果使用这类介质，其两端的编码器和解码器也要变成对应的编码器和解码器。现在编码器也可以把信号转换成其他格式，只要数据传输后，视频解码器与之对应解码就行。
鼠标键盘解码器的功能是接收鼠标键盘编码器发送的鼠标和键盘信号，然后把这些信号解码，再发送给计算机主机。
鼠标键盘解码器，能够将鼠标键盘编码器发送的信号解码出来，发送给计算机。
切换装置与KVM延长器发射端连接的方式可以是有线或无线两种。
KVM延长器发射端可以集成在计算机上，细节如下：
KVM延长器发射端的视频信号输入端与主板的视频输出端连接，KVM延长器发射端的鼠标键盘信号输出端与鼠标键盘输入端连接，KVM延长器发射端的视频编码器对所述视频输入信号输入端输入的视频信号进行编码，KVM延长器发射端的鼠标键盘解码器对KVM延长器发射端的鼠标键盘信号输入端输入的信号进行解码。
KVM延长器接收端可以集成在计算机上，细节如下：
KVM延长器接收端的视频信号输出端与显示器的输入端连接，KVM延长器接收端的鼠标键盘信号输入端与鼠标键盘输出端连接，KVM延长器接收端 的视频解码器对所述视频输入信号输入端输入的视频信号进行解码，KVM延长器接收端的鼠标键盘编码器对KVM延长器接收端的鼠标键盘信号输入端输入的信号进行编码。
本发明有多种实施方式，具体如下：
实施方式1：
对照附图1，KVM延长器接收端切换器的两个端口通过延长线分别与KVM延长器的发射端连接，每个KVM延长器的发射端的另一端连接一个计算机的鼠标端口、键盘端口、显示器端口，每个计算机主机连接不同的局域网。适用于以下业务模式：单位有两套网络，一套是内网，一套是外网，终端用户使用切换器选择一个网络。
工作步骤：
1)远端的两台计算机主机分别连接一台KVM延长器发射端6，连接的方式是，把计算机的视频输出端口连接KVM延长器发射端6的视频输入端口，计算机的鼠标输入端口连接KVM延长器发射端6的鼠标输出端口，计算机的键盘输入端口连接KVM延长器发射端6的键盘输出端口。
2)用双绞线连接远端的带切换装置的KVM延长器接收端4和KVM延长器发射端6。
3)带切换装置的KVM延长器接收端4的部件切换装置10，根据需要将不同的延长线与视频解码器11连接。
4)视频解码器11将收到的视频信号解码后，把信号分配给与之连接的显示器3。
5)鼠标键盘编码器12将鼠标1和键盘2的信号转化后，发送给与之 对应的KVM延长器发射端6，KVM延长器发射端6将信号解码后，发送给与之对应的计算机。
实施方式2：
对照附图3是，切换器有一个鼠标键盘显示器切换器和两个KVM延长器接收端，每个KVM延长器接收端都用鼠标连接线、键盘连接线和视频线连接切换器。
适用于以下业务模式：两个KVM延长器接收端分别接收视频信号和解码视频信号后，发送给切换器，终端用户根据需要，将来自不同KVM延长器接收端的视频信号显示出来，同一个时间，显示器只能显示来自一个KVM延长器接收端的视频信号，并且把鼠标键盘的信号发送给计算机。
工作步骤：
1)切换器一端连接显示器、鼠标、键盘，另两个端口通过延长线分别与KVM延长器发射端连接，每个KVM延长器发射端的另一端连接一台计算机，连接的方式是用连接线连接计算机的鼠标、键盘、显示器，每台计算机主机连接不同的局域网；
2)远端的两台计算机主机分别连接一台KVM延长器发射端6，连接的方式是，把计算机的视频输出端口连接KVM延长器发射端6的视频输入端口，计算机的鼠标输入端口连接KVM延长器发射端6的鼠标输出端口，计算机的键盘输入端口连接KVM延长器发射端6的键盘输出端口；
3)用双绞线连接远端的KVM延长器的接收端和KVM延长器发射端6；
4)切换器里的两个解码器分别与延长线连接，分别解码，解码后发送给 切换装置10；
5)切换装置10自动或手动把视频信号发送给显示器，把鼠标键盘信号发送给计算机。
实施方式3：
包括一个KVM延长器接收端和一个切换装置，切换装置有第一输入输出端、第二输入输出端和第三输入输出端，所述第一输入输出端为第一连接器插座，用于连接第一延长线，所述延长线为连接KVM延长器发射端和KVM延长器接收端的连接线，所述第二输入输出端为鼠标键盘输出端和视频输入端，用于连接计算机的鼠标键盘输入端和视频输出端，第三输入输出端为键盘鼠标输入端和视频输出端，用于连接鼠标键盘显示器，所述切换装置用于将所述第一延长线与视频解码器连接且所述第一延长线与鼠标键盘编码器连接，或者，将所述计算机的鼠标键盘输入端与鼠标键盘连接且所述视频输出端与显示器连接。
对照附图4，是这种实施方式的网络结构图。
适用于以下业务模式：公司已经存在一个局域网，为了信息安全，又建立另外一套网络系统。
用户的工作步骤为：
对照附图5，是一种切换器的结构图，计算机的鼠标、键盘各有四根连接线，两根是电源线，两根是数据线，常用的VGA信号线接口有十五根针，一般需要用到6根线就能实现正常显示了，这6根线是：红，绿，蓝，行同步，场同步，地线；延长线的连接端口有8根连接线。
1)切换按钮推向鼠标输入端口、键盘输入端口、显示器的输出端口，鼠标、键盘、显示器和计算机主机连接，就可以控制本地电脑了。
2)切换按钮推向鼠标输入端口延长线连接端口，这时鼠标、键盘连接鼠标编码器，显示器连接视频解码器，这样用户就可以控制机房的电脑了。
实施方式4：
将切换装置和KVM延长器接收终端分离，构建附图1所述的网络，KVM延长器接收终端包括视频解码器和鼠标键盘编码器。
实施方式5：一种KVM延长器发射端的工作方法
对照附图6，
1)KVM延长器发射端接收虚拟终端的桌面编码；
2)所述KVM延长器发射端将所述编码转换成差分信号；
3)所述KVM延长器发射端向KVM延长器接收端发送所述差分信号。
所述差分信号是适合差分传输的差分信号。
具体的步骤为；
KVM延长器发射端做成一张卡的形式，包括视频编码器、鼠标键盘解码器和插卡管脚，所述插卡管脚用于将所述KVM延长器发射端插在计算机主板上。它直接插在计算机里，这张卡有一个端口，该端口用双绞线输出视频信号和接收键盘鼠标信号。每台计算机有一张或多张这样的卡。
优点：用KVM延长器发射端将虚拟终端发送出去，由于KVM延长器发射端的视频编码器和KVM延长器发射端的视频解码器之间传输的是视频信号，不能传输数据文件，这样用户就不能从计算机主机上复制数据到KVM延长器接收端，有效的保护了数据的安全性。
虚拟终端X是下述虚拟终端中的任意一种。
①一拖多类型的虚拟终端，多人可以同时、独立的使用一台PC机，每个用户都有自己的显示器、键盘、鼠标。用户可同时共享一台PC计算机的硬、软件及外设资源；
一拖多类型的虚拟终端包括一拖多类型的虚拟终端Q和一拖多类型的虚拟终端W：
一个一拖多类型的虚拟终端Q：在一台PC内建立一个计算机用户，或者，运行一个软件建立一个用户，给这个用户分配一个初始桌面，将用户的桌面发送给一个KVM延长器发射端A的视频编码器，用户桌面上的鼠标键盘信号来自KVM延长器发射端的鼠标键盘解码器。
一个一拖多类型的虚拟终端W：在一台PC内建立一个窗口P，窗口P里嵌入一个或多个应用程序，将窗口P和窗口P内显示的内容发送给一个KVM延长器发射端A的视频编码器，窗口上的鼠标键盘信号来自KVM延长器发射端A。一拖多类型的虚拟终端W的桌面是窗口P和窗口P内显示的内容。
②云服务器的客户端：在服务器上，创建一个用户，给这个用户分配一个操作系统，然后给该用户分配处理器、内存、硬盘后，我们称这样的用户为一个云服务器的客户端，所述的服务器即为云服务器。云服务器的客户端的鼠标键盘信号来自KVM延长器发射端的鼠标键盘解码器。
硬件设计：
1、一个KVM延长器发射端做成一张卡，这张卡有一个端口，这个端口用双绞线输出视频信号和接收键盘鼠标信号；
2、这样的卡插在计算机里；
3、启动这张卡的驱动程序。
软件设计：
1)在计算机上创建一个虚拟终端X；
2)将虚拟终端X的桌面作为一个视频源，计算机的处理器不断的将虚拟终端X的桌面发送给KVM延长器发射端A的视频编码器；
3)KVM延长器发射端A的视频编码器把接收到的信号编码后发送出去；
4)KVM延长器接收端B的视频解码器收到信号后，对视频信号进行解码，然后把信号发送给显示器，显示器上显示图像；
5)用户在看到屏幕上显示的图像后，操作鼠标键盘进行一定的操作；
6)KVM延长器接收端B的鼠标键盘编码器接收到鼠标键盘信号后立即进行编码，并且发送出去；
7)KVM延长器发射端A的鼠标键盘解码器接收到KVM延长器接收端B的鼠标键盘编码器发送的鼠标键盘信号后解码，发送给虚拟终端X，限定鼠标、键盘输入信号只作用在虚拟终端X上；
8)虚拟终端X接收鼠标键盘信号并进行相应的操作，相关的操作如果导致屏幕有任何变化，立即在终端X的桌面上显示出来。
实施方式6：带MAC地址的通讯端口传输虚拟终端的方法
单个KVM延长器发射端连接一个带MAC地址的通讯端口，带MAC地址的通讯端口连接交换机有两种，第一种方法是通讯端口连接一个交换机端口，第二种方法是通讯端口连接交换机的交换芯片。
一个带MAC地址的通讯端口可以把一个虚拟终端的桌面发送给与带MAC地址的通讯端口直接连接的KVM延长器发射端。
优点：用KVM延长器发射端将虚拟终端发送出去，用户可以正常的操作虚拟终端。由于KVM延长器发射端的视频编码器和KVM延长器发射端的视频解码器 之间传输的是视频信号，不能传输数据文件，这样用户就不能从计算机主机上复制数据到KVM延长器接收端，有效的保护了数据的安全性。
虚拟终端X是下述虚拟终端的任意一种。
①一拖多类型的虚拟终端，多人可以同时、独立的使用一台PC机，每个用户都有自己的显示器、键盘、鼠标。用户可同时共享一台PC计算机的硬、软件及外设资源；包括一拖多类型的虚拟终端Q和一拖多类型的虚拟终端W。
一个一拖多类型的虚拟终端Q：在一台PC内，建立一个计算机的用户，或者是，运行一个软件R并建立一个用户，给这个用户分配一个初始桌面，将用户的桌面发送给软件M，用户桌面上的鼠标键盘信号来自软件M。
一个一拖多类型的虚拟终端W：在一台PC内，运行一个软件R并建立一个窗口P，窗口P里可以嵌入一个或多个应用程序，将窗口P和窗口P内显示的内容发送给软件M，作用在用户该窗口上的鼠标键盘信号来自软件M。
一拖多类型的虚拟终端W的桌面是窗口P和窗口P内显示的内容。
②云服务器的客户端：在服务器上，运行一个软件R，创建一个用户，给这个用户分配一个操作系统，然后给该用户分配处理器、内存、硬盘后，我们称这样的用户为一个云服务器的客户端，所述的服务器即为云服务器。云服务器的客户端的鼠标键盘信号来自软件M。
软件M是计算机上的一个程序，所述软件M可以作为软件R的一个子程序。KVM延长器发射端从该KVM延长器发射端对应的带MAC地址的通讯端口接收虚拟终端的桌面编码。
详细步骤：
硬件设计：
1)计算机用网线连接一个交换机A；
2)带MAC地址的端口第一输入输出端连接KVM延长器发射端，通讯端口第二输入输出端连接一个交换机端口，或者通讯端口连接交换机的交换芯片；
3)KVM延长器发射端的视频编码器和鼠标键盘解码器共同使用一套处理器、
4)内存、存储器和主板，所述处理器、内存、存储器和主板能够支持安卓操作系统的运行。
软件设计：
对照附图7，
1)计算机和测控设备约定一套数据传输格式和通讯端口号，计算机向KVM延长器发射端发送数据时使用的socket通讯端口为4888，KVM延长器发射端向计算机发送数据时使用的socket通讯端口为4889；
2)计算机的IP地址设置为192.168.1.1；
3)KVM延长器发射端运行一个带TCP/IP协议栈的安卓操作系统；给通讯端口B设置一个IP地址192.168.1.30；
4)在计算机上创建一个虚拟终端X，计算机上运行一个软件M，软件M将虚拟终端X的桌面作为一个视频源，不断的将虚拟终端X的桌面发送给通讯端口B；
5)通讯端口B将收到的信号发送给KVM延长器发射端；
6)KVM延长器发射端运行一个软件Y，软件Y根据计算机和测控设备约定的一套数据传输格式，对接收到的数据包进行解码，得到虚拟终端X的视频编码；然后将虚拟终端X的编码发送给KVM延长器发射端C的视频编码器；
7)KVM延长器发射端C的视频编码器把接收到的界面编成差分信号，发送给KVM延长器接收端D；
8)KVM延长器接收端D收到信号后，对信号进行解码，然后把信号发送给显示器；
9)用户在看到屏幕上显示的图像后，操作鼠标键盘进行一定的操作；
10)KVM延长器接收端D的鼠标键盘编码器接收到鼠标键盘信号后立即进行编码，并且发送出去；
11)KVM延长器发射端C的鼠标键盘解码器接收到远方发送的鼠标键盘信号后解码，转换成鼠标键盘信号，软件Y读取该鼠标键盘信号并将其信号放入一个数据包，该数据报通过带MAC地址的通讯端口B发送给计算机；
12)软件M对该数据报解码，得到鼠标键盘信号，限定所述鼠标、键盘信号只作用在虚拟终端X的桌面上；虚拟终端X接收鼠标键盘信号后进行相应的操作，相关的操作如果导致屏幕有任何变化，用户可以在显示器上立即看到。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。
应用举例：
在办公室里安全上网
设备安装：
1)用户的办公桌下面放置一个带切换装置的KVM延长器接收端；
2在机房里，建立两套网络系统，第一套网络系统是内部办公网络系统， 与互联网完全隔绝；第二套网络系统是访问互联网的网络系统，与互联网连接；
2)两套网络各提供一台计算机，分别连接一个KVM延长器发射端6，KVM延长器发射端6用双绞线连接用户的带切换装置的KVM延长器接收端。
用法：
1)将显示器、鼠标、键盘连接到带切换装置的KVM延长器接收端；
2)根据用户的需要，切换装置将KVM延长器接收端的视频解码器11连接不同的延长线，由于每条延长线连接一台KVM延长器发射端6，每个KVM延长器发射端6连接一台计算机主机，这样用户就可以自由自在的访问互联网或内部办公网络了。

Claims (11)

  1. 带切换装置的KVM延长器接收端，其特征是包括视频解码器、鼠标键盘编码器和切换装置，视频解码器的输入端与切换装置连接，鼠标键盘编码器的输出端与切换装置连接。
  2. 根据权利要求1所述的带切换装置的KVM延长器接收端，其特征在于：所述切换装置有第一输入输出端和第二输入输出端，所述第一输入输出端为第一连接器插座，其用于连接与第一延长线连接，所述第二输入输出端为第二连接器插座，其用于连接与第二延长线连接，所述延长线为连接KVM延长器发射端和KVM延长器接收端的连接线，所述切换装置用于将所述第一延长线与视频解码器连接且所述第一延长线与鼠标键盘编码器连接，或者，将所述第二延长线与视频解码器连接且所述第二延长线与鼠标键盘编码器连接。
  3. 根据权利要求1所述的带切换装置的KVM延长器接收端，其特征在于切换装置有第一输入输出端、第二输入输出端和第三输入输出端，所述第一输入输出端连接第一延长线，所述延长线为连接KVM延长器发射端和KVM延长器接收端的连接线，所述第二输入输出端为鼠标键盘输出端和视频输入端，用于连接计算机的鼠标键盘输入端和视频输出端，第三输入输出端为键盘鼠标输入端和视频输出端，用于连接鼠标键盘显示器，所述切换装置用于将所述第一延长线与视频解码器连接且所述第一延长线与鼠标键盘编码器连接，或者，将所述计算机的鼠标键盘输入端与鼠标键盘连接且所述计算机的视频输出端与显示器连接。
  4. 根据权利要求1所述的带切换装置的KVM延长器接收端，其特征是包括切换装置，第一视频解码器、第一鼠标键盘编码器、第二视频解码器和第二鼠 标键盘编码器，第一视频解码器的输出端与切换装置连接，第一鼠标键盘编码器的输入端与切换装置连接，第二视频解码器的输出端与切换装置连接，第二鼠标键盘编码器的输入端与切换装置连接，所述切换装置用于将所述第一视频解码器与显示器连接且所述第一鼠标键盘编码器与鼠标键盘连接，或者，将所述第二视频解码器与显示器连接且所述第二鼠标键盘编码器与鼠标键盘连接。
  5. 一种计算机主板，其特征在于，包括KVM延长器发射端，
    KVM延长器发射端的视频信号输入端与主板的视频输出端连接，KVM延长器发射端的鼠标键盘信号输出端与鼠标键盘输入端连接，KVM延长器发射端的视频编码器对所述视频输入信号输入端输入的视频信号进行编码，
    KVM延长器发射端的鼠标键盘解码器对KVM延长器发射端的鼠标键盘信号输入端输入的信号进行解码。
  6. 一种计算机，其特征在于，包括KVM延长器接收端，
    KVM延长器接收端的视频信号输出端与所述计算机的显示器的输入端连接，KVM延长器接收端的鼠标键盘信号输入端与鼠标键盘输出端连接，KVM延长器接收端的视频解码器对所述视频输入信号输入端输入的视频信号进行解码，KVM延长器接收端的鼠标键盘编码器对KVM延长器接收端的鼠标键盘信号输入端输入的信号进行编码。
  7. 一种计算机系统，其特征在于，包括：主板，至少一个插卡式KVM延长器发射端，所述插卡式KVM延长器发射端包括视频信号输出端口和鼠标键盘输入接收端口，所述插卡式KVM延长器发射端插在所述主板上。
  8. 一种KVM延长器发射端的工作方法，其特征在于，包括：
    KVM延长器发射端接收虚拟终端的桌面编码；
    所述KVM延长器发射端将所述桌面编码转换成适合差分传输的差分信号；
    所述KVM延长器发射端向KVM延长器接收端发送所述适合差分传输的差分信号。
  9. 一种KVM延长器发射端，其特征是单个KVM延长器发射端的输入端连接一个带MAC地址的通讯端口。
  10. 根据权利要求9所述的一种KVM延长器发射端，其特征是还包括交换机，带MAC地址的通讯端口连接交换机的交换芯片。
  11. 带MAC地址的通讯端口传输虚拟终端的方法，其特征在于，所述KVM延长器发射端接收虚拟终端的桌面编码，包括：所述KVM延长器发射端从该KVM延长器发射端对应的带MAC地址的通讯端口接收虚拟终端的桌面编码。
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