The basic types of wireless Internet access are: 1. Activate the data function through the mobile phone, and use the computer to achieve wireless Internet access through the mobile phone or wireless network card. The speed is determined by the use of different technologies, terminal support speed and signal strength. . 2. Through wireless network equipment, it is a wireless Internet access method based on traditional LAN and built with wireless AP and wireless network card.
The operating environment of this article: windows10 system, thinkpad t480 computer.
What is wireless Internet access
Wireless Internet access refers to the Internet login method using a wireless connection. It uses radio waves as a medium for data transmission. Although the speed and transmission distance are not as good as wired Internet access, it is popular among business people because of its mobile convenience. Wireless Internet access has now been widely used in business districts, universities, airports, and other types of public areas, and its network signal coverage area is further expanding.
Basic types of wireless Internet access
There are two types of wireless Internet access:
One is to activate the data function through a mobile phone , use a computer to access wireless Internet through a mobile phone or wireless network card. The speed is determined by the use of different technologies, terminal support speed and signal strength.
Another wireless Internet access method is wireless network equipment. It is a wireless Internet access method based on traditional LAN and built with wireless AP and wireless network card.
It is generally believed that as long as the Internet terminal is not connected to a wired line, it is called wireless Internet access.
Common wireless Internet access methods:
Method 1: Use your mobile phone to access the Internet alone.
Method 2: A smartphone with WiFi function detects Chinanet’s Wlan signal and accesses the Internet through account authentication.
Method 3: Install a network card on the computer. 3G networks include China Telecom’s EVDO, China Unicom’s WCDMA, and China Mobile’s TD-SCDMA. 2G networks are currently on the verge of being eliminated and are still used by some users, but at slower speeds. (Mobile's GPRS/EDGE/TD, China Telecom's CDMA1X/EV-DO, China Unicom's GPRS/WCDMA), dial-up Internet access.
Method 4: The computer detects Chinanet’s Wlan signal and accesses the Internet through account authentication.
Method 5: Connect the computer to the mobile phone (using a cable/Bluetooth), use the mobile phone as a MODEM dial-up, and use the computer to access the Internet.
Method 6: Install a wireless router (or wireless AP) on the wired broadband, and the computer or mobile phone accesses the Internet through the WiFi signal of the wireless AP.
Method 7: Connect the mobile phone to a computer with wired Internet access via Bluetooth (wireless mode), and share the computer's network cable to access the Internet.
Extended knowledge: Wireless device types
In wireless LAN, common devices include wireless network cards, wireless bridges, wireless antennas, etc.
1. Wireless network card
The function of the wireless network card is similar to the network card in Ethernet. It serves as the interface of the wireless LAN to realize the connection with the wireless LAN. Wireless network cards are mainly divided into four types according to different interface types, namely PCMCIA wireless network card, PCI wireless network card, USB wireless network card, and EXPRESS network card.
PCMCIA wireless network card is only suitable for notebook computers, supports hot swapping, and can realize mobile wireless access very conveniently.
PCI wireless network card is suitable for ordinary desktop computers. In fact, the PCI wireless network card is just an ordinary PCMCIA card inserted into the PCI adapter card.
USB interface wireless network card is suitable for notebooks and desktop computers and supports hot swapping. If the network card has an external wireless antenna, then the USB interface is a better choice.
Express interface, this is a new specification launched by the PCMCIA Alliance, and Intel's latest Napa platform has also been incorporated into the standard. ExpressCards technology leaves PCMCIA behind with its low power consumption, low heat, and fast speed. The wireless network card with ExpressCard interface has the advantages of small size, easy portability, low power consumption and more power saving. Express cards are divided into two specifications, Express54mm and Express 34mm. 54 and 34 respectively represent the actual width of the card (unit: mm). Among them, the smaller Express 34mm card can be inserted into the Express 54mm slot and has better compatibility. At the same time, it consumes less power and generates much less heat than the Express 54mm card.
2. Wireless Bridge
Wireless bridge is a storage and forwarding device that realizes wireless LAN interconnection at the link layer. It can transmit long-distance data through wireless (microwave). Wireless bridge has three working modes, point-to-point, Point-to-multipoint, relay connection. It can be used for long-distance (up to 20km) and high-speed (up to 11mbps) wireless networking between fixed digital equipment and other fixed digital equipment.
Understanding the wireless bridge in terms of its function, it can be used to connect two or more independent network segments. These independent network segments are usually located in different buildings, hundreds of meters to dozens of kilometers apart. Therefore, it can be widely used in interconnection between different buildings. At the same time, according to different protocols, wireless bridges can be divided into 802.11b or 802.11 in the 2.4GHz frequency band and 802.11a wireless bridges in the 5.8GHz frequency band.
3． Wireless antenna
When the computer is far away from the wireless AP or other computers, as the signal weakens, or the transmission rate drops significantly, or it is impossible to communicate with the AP or other computers at all, at this time, you must use a wireless antenna Gain (amplify) a received or transmitted signal.
There are many types of wireless antennas, but there are two common ones. One is indoor antenna, which has the advantage of convenience and flexibility, but the disadvantage is small gain and short transmission distance; the other is outdoor antenna. There are many types of outdoor antennas, one is a pot-shaped directional antenna, and the other is a rod-shaped omnidirectional antenna. The advantage of outdoor antennas is long transmission distance. More suitable for long-distance transmission.
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