There are many protocols to realize WLAN, among which the most famous and widely used is the wireless fidelity technology - Wi-Fi, which actually provides a technology that can interconnect all kinds of terminals using wireless, shielding users from the differences between various terminals.
In practice, WLAN access is very simple, to the family WLAN, for example, only a wireless access device - router, a computer or terminal with wireless capabilities (cell phones or PAD), no wireless capabilities of the computer only need to plug in a wireless network card can be. With the above equipment, the specific operation is as follows: use the router to access the hotspot (other wireless networks that have been set up and are in the receiving range) or wired network into the home, follow the instructions provided by the network service provider to configure the routing, configure and place the receiving terminal within the coverage of your home (the stable coverage of WLAN is about 20 m~50 m), turn on the terminal's wireless function, enter the username and password given by the service provider, and then press the "Yes" button.
The typical application scenarios of WLAN are as follows:
Between buildings: To build a network connection between buildings, instead of a dedicated line, it is simple and inexpensive.
Restaurant and retail: The restaurant and food service industry can use WLAN products to input and transmit customer orders directly from the table to the kitchen and counter. Retailers can use WLAN products to set up temporary checkout counters during promotions.
Medical: Using handheld computers with WLAN products to obtain real-time information, healthcare professionals can improve the quality of care for patients by avoiding delays in treating patients, unnecessary paperwork, delays in document circulation, and misdiagnosis.
Enterprise: When employees use WLAN products, they can send email, share files, and browse the Internet anywhere in the office with WLAN products.
Warehouse management: General warehousing staff inventory matters, through the application of wireless networks, can immediately enter the latest information into the computerized warehousing system.
Container distribution yard: general container distribution yard bridge crane, can be mobilized in the container, the real-time information will be transmitted back to the office, in order to facilitate the related operations by line.
Surveillance system: Generally located in the remote and need to be monitored by the site of the place, due to the difficulties of wiring, can be transmitted back to the main control station by wireless network of the remote image.
Display venue: such as general electronic exhibitions, computer exhibitions, due to the high demand for the network, and the wiring will make the venue look cluttered, so if you can use the wireless network, it is the best choice.