WO2020125705A1 - 一种新型kvm延长器 - Google Patents
一种新型kvm延长器 Download PDFInfo
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- WO2020125705A1 WO2020125705A1 PCT/CN2019/126468 CN2019126468W WO2020125705A1 WO 2020125705 A1 WO2020125705 A1 WO 2020125705A1 CN 2019126468 W CN2019126468 W CN 2019126468W WO 2020125705 A1 WO2020125705 A1 WO 2020125705A1
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- 239000004606 Fillers/Extenders Substances 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 description 19
- 230000005540 biological transmission Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
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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
- G06F3/03—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
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
-
- 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
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
Definitions
- the invention relates to a KVM extender, which belongs to the technical field of electronic equipment.
- the advantage is that the server sends the video signal to the extender receiving end is unidirectional, and there is no data packet transmission between the extender receiving end and the extender sending end in this process, but the disadvantage is that the extender receiving end and the extender send There is also a pair of RS485 transmission lines between the terminals. Mouse and keyboard signals are transmitted between the lines. Since the RS485 transmission line is a bidirectional transmission line, if someone inside wants to steal internal data maliciously, it is possible to steal data from this line .
- the purpose of the present invention is to invent a new type of KVM extender transmitting end in view of the above problems, that is, the KVM extender transmitting end has at least one unidirectional input port, the output end of the KVM extender receiving end and the KVM extender transmitting end Unidirectional input port connection.
- the mouse and keyboard output end of the receiving end of the KVM extender are connected to the unidirectional input port of the sending end of the KVM extender;
- the server does not transmit data packets to the user terminal, which greatly increases the data security.
- Figure 1 is a structural diagram of the present invention.
- 1 is the sending end of the KVM extender, and 2 is the receiving end of the KVM extender.
- Figure 2 is a working method of KVM extender.
- the input end of the KVM extender and the output end of the KVM extender use RS485 simplex communication mechanism, not a half-duplex communication mechanism, that is, the output end of the KVM extender receiver sends data unidirectionally to the KVM extender sender .
- a one-drop multi-type virtual terminal W Create a window P in a PC, embed one or more applications in the window P, and send the content displayed in the window P and window P to a KVM extender sender A
- the mouse and keyboard signals on the window come from the sender A of the KVM extender.
- the desktop of the multi-type virtual terminal W is a window P and the content displayed in the window P.
- the virtual terminal X may be any of the above virtual terminals, or may be a virtual terminal such as a container.
- a working method of a KVM extender or a working method of a KVM extender transmitting a virtual terminal.
- Step S20 The sending end of the KVM extender converts the code into a differential signal
- Step S30 The sending end of the KVM extender sends the differential signal to the receiving end of the KVM extender
- the sending end of the KVM extender is made into the form of a card, including a video encoder, an RS485 interface converter, and a card insertion pin.
- the card insertion pin is used to insert the send end of the KVM extender on the computer motherboard on. It plugs directly into the computer.
- This card has a port that uses twisted-pair cable to output video signals and receive keyboard and mouse signals.
- the sending end of a KVM extender is made into a card. This card has a port. This port uses a twisted pair to output video signals and receive keyboard and mouse signals; each computer has one or more such cards.
- the processor of the computer continuously sends the desktop of the virtual terminal X to the sending terminal A of the KVM extender;
- the transmitter A of the KVM extender encodes the received signal and sends it out;
- the receiver B of the KVM extender After receiving the signal, the receiver B of the KVM extender decodes the video signal, and then sends the signal to the display, and the image is displayed on the display;
- the sender A of the KVM extender receives the signal sent from the mouse and keyboard signal output port of the receiver B of the KVM extender from its one-way input port, and sends it to the virtual terminal X after processing, limiting the input signals of the mouse and keyboard to only act on On the virtual terminal X;
- the virtual terminal X receives the mouse and keyboard signals and performs corresponding operations. If the related operations cause any changes to the screen, they are immediately displayed on the desktop of the terminal X.
- the virtual terminal X is a multi-type virtual terminal or a client of a cloud server.
- Computer Z runs a software to create a virtual terminal X, assigns an initial desktop to the user, and sends the user's desktop to a KVM extender sender A.
- the mouse and keyboard signals on the user's desktop come from the KVM extender sender.
- the processor of the computer continuously sends the desktop of the virtual terminal X to the sending terminal A of the KVM extender;
- the transmitter A of the KVM extender encodes the received signal and sends it out;
- the receiving end B of the KVM extender immediately encodes and receives the mouse and keyboard signals, and sends them out;
- the one-way input port of the sender A of the KVM extender receives the mouse and keyboard signals of the receiver B of the KVM extender, and the sender A of the KVM extender is connected to the computer Z.
- the computer Z limits the mouse and keyboard input signals to only act on the virtual On terminal X;
- the virtual terminal X receives the mouse and keyboard signals and performs corresponding operations. If the related operations cause any changes to the screen, they are immediately displayed on the desktop of the terminal X.
- the sending end of a single KVM extender is connected to a communication unit with a MAC address.
- a one-drop multi-type virtual terminal Q in a PC, create a computer user, or, run a software R and create a user, assign an initial desktop to this user, and send the user’s desktop to the software M
- the mouse and keyboard signals on the user's desktop come from software M.
- a one-drop multi-type virtual terminal W in a PC, run a software R and create a window P, one or more applications can be embedded in the window P, the window P and the content displayed in the window P are sent to Software M, the mouse and keyboard signals acting on the user's window come from software M.
- the desktop of the multi-type virtual terminal W is a window P and the content displayed in the window P.
- 2Client of the cloud server run a software R on the server, create a user, assign an operating system to the user, and then assign processors, memory, and hard disks to the user, we call such a user a cloud server
- the server is a cloud server.
- the mouse and keyboard signals of the client of the cloud server come from the software M.
- the first input and output of the unit with MAC address is connected to the sending end of the KVM extender, the second input and output of the communication unit is connected to a switch port, or the communication port is connected to the switch chip of the switch;
- the computer and the measurement and control equipment agree on a set of data transmission format and communication port number.
- the socket communication port used when the computer sends data to the sender of the KVM extender is 3888, and the socket communication port used when the sender of the KVM extender sends data to the computer 3889;
- the computer's IP address is set to 192.168.1.1;
- the sending end of the KVM extender runs an Android operating system with TCP/IP protocol stack; set an IP address 192.168.1.20 to communication port B;
- the communication port B sends the received signal to a communication processing unit H, and the communication processing unit H sends the signal to the sending end of the KVM extender;
- the video encoder of the transmitter C of the KVM extender compiles the received interface into a differential signal and sends it to the receiver D of the KVM extender;
- the receiver D of the KVM extender After receiving the signal, the receiver D of the KVM extender decodes the signal, and then sends the signal to the display;
- KVM extender (or a working method using the above KVM extender):
- the sending end of the KVM extender receives the desktop code of the virtual terminal
- the sending end of the KVM extender converts the desktop code into a differential signal
- the sending end of the KVM extender sends the differential signal to the receiving end of the KVM extender
- the KVM extender receiving end sends mouse and keyboard signals
- the KVM extender sending end receives the mouse and keyboard signal input ports through the mouse and keyboard signal input ports of the KVM extender sending end.
- the first network system is an internal office network system, completely isolated from the Internet;
- the second network system is a network system that accesses the Internet and is connected to the Internet;
- Each of the two networks provides a computer, which is respectively connected to a KVM extender transmitter.
- the KVM extender transmitter is connected to the user's KVM extender receiver with a twisted pair.
- the switching device connects the video decoder at the receiving end of the KVM extender to different extension cords. Since each extension cord is connected to the sending end of a KVM extender, each sending end of the KVM extender is connected to a computer host , So that users can freely access the Internet or internal office network. In this way, no matter what kind of bad guys appear inside, it is completely impossible to copy the data of the system on the user side.
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Abstract
一种新型KVM延长器，KVM延长器发送端至少有一个单向输入端口，KVM延长器接收端的输出端与所述KVM延长器发送端的单向输入端口连接。在局域网中，服务器不向用户端传输数据包，大大增加了数据的安全性。
Description
本发明涉及的是KVM延长器，属于电子设备技术领域。
现在的很多重要的单位都安装了两套计算机网络，一套内网，是内部办公网络，一套外网，连接互联网，这两种方式给人们的生活带来了极大的方便。单位构建的内网的类型有很多，其中有一种先进的类型：在单位内部构建一种局域网，单位在机房内设置一台服务器，在服务器上安装虚拟机，然后将虚拟机的视频发送给普通的延长器发送端，然后将延长器发送端将视频转换成差分信号后，发送给延长器接收端，然后延长器接收端将信号处理后，发送到用户的显示器。优点是是服务器发送视频信号给延长器接收端是单向的，并且在这过程中延长器接收端与延长器发送端之间没有数据包的传输，但缺点是延长器接收端与延长器发送端之间还有一对RS485传输线路，线路之间传输的是鼠标、键盘信号，由于RS485传输线路是双向传输线路，如果内部有人想恶意偷走内部资料，就有可能从这条线路偷走数据。
发明内容
本发明的目的在于针对上述存在的问题，发明一种新型KVM延长器发送端，是KVM延长器发送端至少有一个单向输入端口，KVM延长器接收端的输出端与所述KVM延长器发送端的单向输入端口连接。
本发明的技术解决方案：KVM延长器接收端的鼠标、键盘输出端与所述KVM延长器发送端的单向输入端口连接；
本发明的优点：在局域网中，服务器不向用户端传输数据包，大大增加了数据的安全性。
附图1是本发明的结构图。
1是KVM延长器发送端，2是KVM延长器接收端。
附图2是一种KVM延长器的工作方法。
实施例中，
KVM延长器发送端发送视频信号给KVM延长器接收端；
KVM延长器接收端发送鼠标、键盘信号给KVM延长器发送端。
KVM延长器发送端的输入端与KVM延长器接收端的输出端之间使用RS485的单工通讯机制，不是半双工通讯机制，即KVM延长器接收端的输出端单向发送数据给KVM延长器发送端。
在本发明的一个实施例中：
一种KVM延长器的工作方法。
优点:
1)用KVM延长器发送端将虚拟终端的桌面发送出去,由于KVM延长器发送端的视频编码器和KVM延长器发送端的视频解码器之间传输的是差分信号，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。
2)KVM延长器的鼠标键盘编码器将鼠标、键盘信号发送给KVM延长器接收端的单向输入端口，KVM延长器接收端不能通过485线路或其他类似 线路发送信号，这样可以避免不良用心的人通过RS485线路盗窃数据。
虚拟终端包括一拖多类型的虚拟终端或者是云服务器的客户端。
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延长器发送端A,用户桌面上的鼠标键盘信号来自KVM延长器发送端。
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延长器发送端A,窗口上的鼠标键盘信号来自KVM延长器发送端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延长器发送端的鼠标键盘解码器。
虚拟终端X可以是上述虚拟终端的任意一种，也可以是容器等虚拟终端。
图2所示，一种KVM延长器的工作方法，或者说是一种KVM延长器传输虚拟终端的工作方法。
步骤S10：KVM延长器发送端接收虚拟终端的桌面编码；
步骤S20：所述KVM延长器发送端将所述编码转换成差分信号；
步骤S30：所述KVM延长器发送端向KVM延长器接收端发送所述差分信号；
步骤S40：所述KVM延长器接收端的鼠标、键盘信号输出端口单向并且仅能单向发送数据给所述KVM延长器的发送端。
具体的步骤为；
硬件设计:
1、KVM延长器发送端做成一张卡的形式，包括视频编码器、RS485接口转换器和插卡管脚，所述插卡管脚用于将所述KVM延长器发送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。一个KVM延长器发送端做成一张卡，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；每台计算机有一张或多张这样的卡
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延长器发送端A；
3)KVM延长器发送端A把接收到的信号编码后发送出去；
4)KVM延长器接收端B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延长器发送端A从它的单向输入端口接收到KVM延长器接收端B的鼠标键盘信号输出端口发送的信号，处理后发送给虚拟终端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。
在本发明的另一个实施例中：
虚拟终端X是一拖多类型的虚拟终端或者是云服务器的客户端。
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；
1)计算机Z运行一个软件创建一个虚拟终端X，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延长器发送端A,用户桌面上的鼠标键盘信号来自KVM延长器发送端。
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延长器发送端A；
3)KVM延长器发送端A把接收到的信号编码后发送出去；
4)KVM延长器接收端B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延长器发送端A的单向输入端口，接收到KVM延长器接收端B的鼠标 键盘信号，KVM延长器发送端A的连接计算机Z，计算机Z限定鼠标、键盘输入信号只作用在虚拟终端X上；
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。
在本发明的另一个实施例中：
单个KVM延长器发送端连接一个带MAC地址的通讯单元，带MAC地址的通讯单元连接交换机有两种，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。
优点:用KVM延长器发送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延长器发送端的视频编码器和KVM延长器发送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。
虚拟终端指的是一拖多类型的虚拟终端或者是云服务器的客户端。
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延长器发送端从该KVM延长器发送端对应的带MAC地址的通讯端口接收虚拟终端的桌面编码。
虚拟终端X是上述虚拟终端的任意一种。
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地址的单元第一输入输出端连接KVM延长器发送端，通讯单元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延长器发送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:
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 延长器发送端发送数据时使用的socket通讯端口为3888，KVM延长器发送端向计算机发送数据时使用的socket通讯端口为3889；
2)计算机的IP地址设置为192.168.1.1；
3)KVM延长器发送端运行一个带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192.168.1.20；
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一个通讯处理单元H，通讯处理单元H将信号发送给KVM延长器发送端；
6)KVM延长器发送端运行一个软件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延长器发送端C的视频编码器；
7)KVM延长器发送端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延长器发送端C从它的单向输入端口接收到远方发送的鼠标键盘信号后，将信号发送给通讯处理单元H，通讯处理单元H将鼠标键盘信号发送给计算机；
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。
1、用简短的语言表达实施例中的发明点：KVM延长器发送端的鼠标、键盘信号输入端口是单向输入端口，KVM延长器接收端的输出端与所述KVM延长器发送端的的鼠标、键盘信号输入端口连接。
优选的：一种KVM延长器的工作方法(或者说是，一种采用上述KVM延长器的工作方法)：
KVM延长器发送端接收虚拟终端的桌面编码；
所述KVM延长器发送端将所述桌面编码转换成差分信号；
所述KVM延长器发送端向KVM延长器接收端发送所述差分信号；
所述KVM延长器接收端发送鼠标、键盘信号，所述KVM延长器发送端通过所述KVM延长器发送端的鼠标、键盘信号输入端口接收所述鼠标、键盘信号。
应当说明的是，以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。
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延长器发送端，KVM延长器发送端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连接不同的延长线，由于每条延长线连接一台KVM延长器发送端，每个KVM延长器发送端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。这样，无论内部出现什么样的坏人，都完全不可能在用户端复制系统的数据。
Claims (2)
- 一种新型KVM延长器，其特征是：所述KVM延长器发送端的鼠标、键盘信号输入端口是单向输入端口，KVM延长器接收端的输出端与所述KVM延长器发送端的的鼠标、键盘信号输入端口连接。
- 一种KVM延长器的工作方法，其特征在于，包括：KVM延长器发送端接收虚拟终端的桌面编码；所述KVM延长器发送端将所述桌面编码转换成差分信号；所述KVM延长器发送端向KVM延长器接收端发送所述差分信号；所述KVM延长器发送端的鼠标、键盘信号输入端口是单向输入端口，KVM延长器接收端发送鼠标、键盘信号，所述KVM延长器发送端通过所述KVM延长器发送端的鼠标、键盘信号输入端口接收所述鼠标、键盘信号。
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