1, the role and function of wireless network cards are the same as ordinary computer network cards, which are used to connect to the local area network. It is justA signal transceiver device can only be connected to the Internet when it finds an exit on the Internet, and all wireless network cards can only be limited to the range of wireless LAN that has been deployed. Wireless network card is a terminal wireless network equipment, is not through the wired connection, the use of wireless signals for data transmission terminal.
2, the working principle of the wireless network card network card is a network component working in the data link layer, is the interface connecting the computer and the transmission medium in the LAN, not only can realize the physical connection between the LAN transmission medium and the electrical signal match, but also involves the sending and receiving of the frame, the encapsulation and unpacking of the frame, the interfaceQuality access control, data encoding and decoding and data cache functions.
3. Wireless networks use radio communications that are slightly different from radios and cell phones. Wireless cards, for example, are designed to operate at higher frequencies to handle more data - typically 4 GHz or 5 GHz. In addition, wireless cards and routers can communicate over one of three different frequency channels. In situations where many people use wireless signals, such as airports crowded with business travelers, wireless cards and routers can also jump between channels to reduce interference.
1, wireless communication is a communication method that uses the characteristics of radio wave signals that can propagate in free space for information exchange. Wireless communication realized in mobile is also known as mobile communication, and people call the two together as wireless mobile communication. In simple terms, wireless communication is a way of communication that only uses electromagnetic waves and not through cables. 1, wireless spectrum All wireless signals are transmitted through the air with electromagnetic waves, electromagnetic waves are energy waves composed of electronic parts and energy parts.
2, - is actually the cable network signal conversionInto a wireless signal, the use of wireless routers to support the technology of the relevant computers, mobile phones, etc., receive. The application field of wireless WiFi - network media: The frequency band of wireless network in the world is not required any telecom operating license, so WLAN wireless equipment provides a wireless air interface that can be used worldwide, the cost is extremely low and the data bandwidth is extremely high.
3, the basic principle of wireless communication Wireless communication is the use of electromagnetic waves in the air propagation of communication. The wireless signal is transmitted by a transmitter through an antenna, travels through the air, and is converted back into an electric current when it reaches the receiver. There is noLetter, thereby eliminating the bondage of wires. The wireless communication methods usually used include Bluetooth, Wi-Fi (IEEE 8011), Infrared (IrDA), ZigBee (IEEE 8014) and many other wireless technology standards, but for the current mainstream wireless mouse, only 27Mhz, 4G and Bluetooth wireless mouse a total of three categories.
Rolling mouse: rubber ball driven to grating wheel LED and phototransistor crystal pulse signal sensor; Photoelectric mouse: infrared scattering spot irradiation particles with light-emitting semiconductor and photoelectric inductionThe light source pulse signal sensor; Wireless mouse: DRF technology is used to convert the mouse's movement on the X or Y axis, key press or lift information into wireless signals and send them to the host.
The new wireless mouse and 3D vibrating mouse are relatively new mice. Wireless mice are produced to accommodate large screen displays. The so-called "wireless", that is, there is no wire connection, but the use of two seven battery wireless remote control, the mouse has automatic sleep function, the battery can be used for one year, the receiving range is within 8 meters.
or move your finger on the sensor plate and the cursor will move in the corresponding directionWhen the cursor reaches a predetermined position, click the mouse or sensor board to perform the corresponding function. Wireless mouse and 3D mouse: The new wireless mouse and 3D vibrating mouse are relatively new mice. Wireless mice are produced to accommodate large screen displays.
Optical lens mouse: a computer input device, divided into wired and wireless two, is also a computer display system vertical and horizontal coordinate positioning indicator, because the shape of a mouse and named "mouse" (RTHK as a mouse). The standard name of "Mouse" should be "mouse", the English name "mouse", the mouse is used to makeThe operation of the computer is easier and faster, instead of the tedious instructions of the keyboard.
Wireless mouse uses wireless technology to communicate with the computer, thus eliminating the shackles of cables. The wireless mouse has better portability and flexibility than the traditional wired mouse, and can ensure the simplicity of the computer desk. Perfect for mobile work. However, the anti-interference ability of the wireless mouse is generally not so good as that of the wired mouse, and it also needs to be charged or replaced. At present, wireless mice are mainly divided into Bluetooth mice and 4G wireless mice.
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Its principle is also very simple, the mouse part works the same as the traditional mouse, and then use the wireless transmitter to put the mouse in X or YThe movement on the axis, the information of the key press or lift is converted into a wireless signal and sent out, the wireless receiver receives the signal and decodes it to the host, and the driver tells the operating system the mouse action, which direction to move the mouse pointer or what instruction to execute.
Most wireless mice use radio frequency (RF) technology to transmit information to the computer. As RF based, RF devices require two main components: the transmitter and the receiver. It works as follows: The transmitter is installed in the mouse housing. It sends an electromagnetic (radio frequency) signal to encode information about the mouse movement and the mouse button clicked. The receiver is connected to the computer.
Mouse types Currently commonly used there are 3 kinds of ball mouse photoelectric mouse wireless mouse principle: mouse according to its working principle can be divided into mechanical and photoelectric two kinds, the most common is the mechanical mouse. Today's mechanical mouse is actually an optical mouse, which converts the mechanical rotation of the wheel into an optical signal and then into an electrical signal. The following is an example of how this mouse works.
Wireless keyboard, its working principle is mainly through a wireless receiving device and computer system host connected. Keyboards and mice are generally sharedA wireless receiver, but the two use different channels of radio waves, so there will be no interference with each other or can not receive/transmit conditions occur.