Brief Introduction to wireless network standards

Wireless Networks are one of our commonly used networks. How much do you know about wireless network standards? Now let's introduce some common standards. Currently, commonly used wireless network standards include IEEE Electrical and Electronic Engineers Association, The Institute of Electrical icaland Electronics Engineers). The 802.11 standards set include 802.11a, 802.11b, and 802.11g), Bluetooth) standard and HomeRF Home Network) standard.

IEEE is the IEEE of the American Association of Electrical and Electronics Engineers. To address wireless network device interconnection, the IEEE Standard for wireless LAN was developed.

802.11 is the first standard for wireless LAN developed by IEEE. It is mainly used for wireless access between users and user terminals in office LAN and campus networks. Its business is mainly limited to data access, the maximum speed is 2 Mbit/s. Because it cannot meet people's needs in terms of speed and transmission distance, the IEEE team has successively introduced two new standards, 802.11b and 802.11a. The former has become the mainstream standard, the latter is also favored by many manufacturers.

IEEE802.11a is the IEEE of the American Association of Electrical and Electronics Engineers) to improve its initial wireless standard 802.11 Wireless LAN protocol standard. It is a useful supplement.

The 802.11a standard is a standard that has been widely used in offices, homes, hotels, airports, and many other occasions. The 802.11b transmission speed is 11 M/S. The advantage of the 802.11a standard transmission is that the transmission speed is fast and the speed can reach 54 Mbps, fully meeting the needs of voice, data, image and other services. The disadvantage is that it cannot be compatible with 802.11b, so some wireless network devices that have already purchased the 802.11b standard cannot be used in the new 802.11a network. Whether or not a protocol standard is supported for different devices during device purchase.

802.11a has a higher bandwidth and is suitable for processing a large amount of data, such as transmitting audio and video information, or using a public wireless transmission service with a larger number of users. Of course, 802.11a is the most important choice, but for Internet users, the use of the 802.11b system requires sufficient speed. In addition, the popular price is even more attractive. Consumers can decide which product to purchase based on their own needs and budget.

In the wireless network standard, IEEE802.11b is the IEEE of the American Association of Electrical and Electronics Engineers. It is the second generation of Wireless LAN protocol standard to improve its initial wireless standard 802.11.

To solve the interconnection problem of Various wireless network devices, IEEE of the American Association of Electrical and Electronics Engineers (IEEE) released the IEEE wireless protocol. Currently, the 802.11 standard mainly includes three standards: 802.11b, 802.11a, and 802.11g. The first release was 802.11b, with the transmission speed of 11 MB/s. because of its low connection speed, it was then introduced with the 802.11a standard, with the connection speed up to 54 MB/s. However, due to their incompatibility, some wireless network devices that have already purchased the 802.11b standard cannot be used in the new 802.11a network, therefore, IEEE officially launched the fully compatible 802.11b standard and compatible with the 802.11a speed standard, so that through 802.11g, the original 802.11b and 802.11a devices can be used in the same network.

Like 802.11b, IEEE802.11g also works within the range of a wireless working frequency in the GHz band. If the mobile phone we use must work within a certain frequency range, it is 5 times faster than the current general 802.11b and is fully compatible with 802.11. It is recommended that you check whether the protocol standard is supported when purchasing a device.

The HomeRF Working Group was established in 1997 by the US household radio frequency Commission (RF). Its main task is to establish an interactive voice and data communication network for home users. The HomeRF standard is integrated with speech and data transmission technologies. The working frequency is 10 GHz and the data transmission rate reaches 100 Mbit/s. Access Control and encryption technologies are mainly considered for WLAN Security.

HomeRF integrates and improves existing wireless communication standards: for data communication, the TCP/IP transmission protocol in the standard is adopted. For voice communication, the digital enhanced cordless communication standard is adopted. However, this standard is incompatible with 802.11b and occupies the same GHz frequency segment as 802.11b and Bluetooth, so it has great limitations in the application scope, more is used in the home network.

The so-called Bluetooth technology is actually a short-range radio technology, it can effectively simplify the communication between handheld computers, laptops, mobile phones, and other mobile communication terminal devices. It can also successfully simplify the communication between these devices and the Internet, as a result, the data transmission between these modern communication devices and the Internet becomes more efficient and efficient, broadening the road for wireless communication. Now Wireless LAN products have gradually supported bluetooth technology.

To put it bluntly, the bluetooth technology enables modern mobile communication devices and computer devices to connect to the Internet without using cables, and enable wireless Internet access, its practical application scope can also be expanded to various household appliances, consumer electronic products and information appliances such as automobiles, forming a huge wireless communication network. Bluetooth is a short-distance, low-cost wireless connection technology. It is an open solution for wireless voice and data transmission.

The Bluetooth Product uses a technology called frequency hopping to resist signal fading. It works in the GHz ISM (industrial, scientific, and medical) frequency band, this saves the trouble of applying for a dedicated license. The FM modulation method is used to make the device more simple and reliable. Each Bluetooth voice channel supports synchronous voice of 64 KB/s, asynchronous channels support asymmetric connections with a maximum rate of 721 Kbps, a reverse response rate of 57.6Kbps, or 432.6kb/s.

RTD products using wireless network standards include BT110ER with Bluetooth Standard and WLAN17202ER with sampling 802.11 standard.