Some wireless basic concepts are summarized as below. You can click the title to access the corresponding answers. ●What Are the Main Differences Among 802.11a/b/g/n/ac/ac wave2 Standards? ●What kind of Interference Sources Are There in WLAN? ●What Is the Difference Between WLAN and...
Propagation delays often occurs in data transmission process and influence the capability of the wireless network. It can result from multiple factors, such as multipath effect. GI (Guard Interval) is intended to solve the problem based on delays, and Short GI is used to improve the throughput of...
The standards are summarized in following picture and vary in frequency band and rate.
In wireless signal transmission, specialized units are used for different wireless parameters. These are introduced here. mW It is a measurement for transmission power. One mW is a thousandth of a Watt (W). The reason why we use mW instead of W to describe wireless transmission power is that...
Band Steering is an advanced wireless feature in TP-Link dual-band EAP and CAP products. If a station is capable of communicating on both the 2.4GHz and 5GHz frequency bands, it will typically connect to the 2.4 GHz band. However, if too many stations are connected to an AP on the 2.4 GHz...
The station listens to management frames such as beacon frames over all channels. And when the data transmission channel is determined, the station sends and receives data frames over one specific channel. Note that the wireless device cannot send or receive the above frames at the same time...
In TP-Link Pharos series products, there is a wireless configuration option named Max TX Rate, and the options may include MCS1, MCS2 and so on in 802.11n and 802.11ac modes. MCS (Modulation and Coding Scheme) is mainly used to facilitate the maximum wireless rate configuration for 802.11n and...
In wireless products, there are some advanced wireless parameters to be configured, such as Beacon Interval, RTS Threshold and DTIM Period. For good performance of the wireless network, these advanced parameters should be properly configured. The following sections introduce the three parameters...
The most widely used wireless encryption methods are WEP, WPA, and WAP2. ●WEP (Wired Equivalent Privacy) is a traditional encryption method, which is based on RC4 stream cipher algorithm. The station and the AP share a same WEP key to encrypt and decrypt the data. It has been proved that WEP...
Devices using different wireless protocols have different wireless transmission rates. Among the three protocols, 802.11g supports the lowest rate, and 802.11ac supports the highest rate. When there are several stations respectively using 802.11g, 802.11n and 802.11ac to communicate with an AP, the...
The early IEEE 802.11 standard does not support QoS (Quality of Service), meaning that all applications have equal opportunity to transmit data. That works well for applications such as web browser and email. But for delay-sensitive multimedia applications such as VoIP and video streaming, the...
●Physical rate is the physical layer rate of a radio interface which continually sends data. For example, the physical rate of 802.11b is 11Mbit/s. ●Theoretical rate takes the following factors into account: packet header, checksum bits, link code, PLCP header, transmission delay and ACK frame...
WLAN (wireless local area network) rate refers to the data transmission rate between two wireless devices. In a wireless network, devices work in half-duplex mode. This means they can send or receive data at the same time. The rate of sending data is called upstream rate, and the rate of receiving...
●BSS (basic service set) provides a basic building-block of an 802.11 wireless network. It is a group of terminals working in the same basic service area. There are two types of BSS: Independent BSS (IBSS) and Infrastructure BSS. IBSS is also known as ad hoc BSS. Terminals in IBSS communicate with...
HT20 (High Throughput 20) means that the wireless devices working with 20MHz channel. Likewise, HT40 and HT80 use 40MHz and 80MHz channel respectively. By default, wireless devices use 20MHz channel. To improve the speed, HT40 broadens the bandwidth by binding two continuous 20MHz channels or...
●TDMA (time division multiple access) is a digital transmission technology, and it is one part of Multiple Access technologies. TDMA divides time into periodic and non-overlapping frames, then divides each frame into several time slots. Each user in the network is allocated a fixed time slot, and...
Beamforming is the combination of antenna technology and signal processing technology used in the MIMO system. It processes the signals sent by multiple antennas to generate a directional signal. As for receivers, beamforming produces a directional radiation pattern to adapt the signal from the...
What Is the Difference Between WLAN and Wi-Fi and How Do They Relate to Each Other? ●WLAN is short for wireless local area network. It is a compliment to LAN (local area network). WLAN links several wireless devices by using the RF (Radio Frequency) technology and is mostly based on IEEE 802.11...
● MIMO (Multiple-Input Multiple-Output) is a technique that was first introduced with the 802.11n standard to multiply the capacity of radio links. The MIMO system consists of multiple transmitting antennas and multiple receiving antennas. All the transmitting antennas forward data at the same...
There are many kinds of wireless interference encountered in daily life. When deploying a wireless network, these interferences may influence the network capability. The interference sources and the methods to reduce their effects are explained below. ● In a large wireless network such as a...
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