802.11 Maximum Download Speed !!HOT!!
Kimbra Koran
802.11 represents the IEEE designation for wireless networking. Several wireless networking specifications exist under the 802.11 banner. The Network+ objectives focus on 802.11, 802.11a, 802.11b, 802.11g, and 802.11n. All these standards use the Ethernet protocol and the CSMA/CA access method.
The 802.11 wireless standards can differ in terms of speed, transmission ranges, and frequency used, but in terms of actual implementation they are similar. All standards can use either an infrastructure or ad hoc network design, and each can use the same security protocols. Ad hoc and infrastructure wireless topologies were discussed in Chapter 1.
802.11n is poised to bring about the next big change in wireless networking, promising greater distances and staggering speeds. But how is this done? 802.11n takes the best from the 802.11 standards and mixes in some new features to take wireless to the next level. First among these new technologies is multiple input multiple output (MIMO) antenna technology.
MIMO is unquestionably the biggest development for 802.11n and the key to the new speeds. Essentially, MIMO uses multiplexing to increase the range and speed of wireless networking. Multiplexing is a technique that combines multiple signals for transmission over a single line or medium. MIMO enables the transmission of multiple data streams traveling on different antennas in the same channel at the same time. A receiver reconstructs the streams, which have multiple antennas as well. By using multiple paths, MIMO provides a significant capacity gain over conventional single-antenna systems, along with more reliable communication.
In addition to all these improvements, 802.11n allows channel bonding that essentially doubles the data rate again. What is channel bonding? The 802.11b and 802.11g wireless standards use a single channel to send and receive information. With channel bonding, you can use two channels at the same time. As you might guess, the ability to use two channels at once increases performance. It is expected that bonding will help increase wireless transmission rates from the 54Mbps offered with the 802.11g standards to a theoretical maximum of 600Mbps. 802.11n uses the OFDM transmission strategy.
The original 802.11 standard had two variations, both offering the same speeds but differing in the RF spread spectrum used. One of the 802.11 standards used FHSS. This 802.11 variant used the 2.4GHz radio frequency band and operated at a 1 or 2Mbps data rate. Since this original standard, wireless implementations have favored DSSS.
The second 802.11 variation used DSSS and specified a 2Mbps peak data rate with optional fallback to 1Mbps in very noisy environments. 802.11, 802.11b, and 802.11g use DSSS. This means that the underlying modulation scheme is similar between each standard, allowing all DSSS systems to coexist with 2, 11, and 54Mbps 802.11 standards. As a comparison, it is like the migration from the older 10Mbps Ethernet networking to the more commonly implemented 100Mbps standard. The speed was different, but the underlying technologies were similar, allowing for an easier upgrade.
I just upgraded my internet connection to 120Mbps. My notebook wireless networking card supports 802.11n, which theoretically would give me a max speed of 300-450Mbps if I did a correct research. However, I'm getting speeds around 60-70Mbps.
Long Answer:
The 802.11n standard allowed for a wide range of hardware with different capabilities. The main options were how many "spatial streams" your hardware would support, and how wide of channels your hardware would support. 802.11n allowed for 1, 2, 3, or 4 spatial streams (this is closely related to the "MIMO" numbers like 1x1, 2x2, etc.). Four spatial streams is 4x the speed of a single spatial stream. 802.11n also allowed for 20MHz- and 40MHz-wide channels, 40MHz-wide channels are slightly more than twice as fast as 20MHz-wide channels.
If your AP is not capable of AC (802.11ac), but is only capable of N (802.11n) and earlier, then your QCA9377's maximum PHY rate will be 150Mbps if your N-capable AP is capable of 40MHz-wide channels, and 72.2Mbps if your N-capable AP is only capable of 20MHz-wide channels. This is because your QCA9377 chipset only supports a single spatial stream, so it doesn't get the speed-multiplying effect of additional spatial streams.
Your screenshot shows that your AP is using channel 132. It also shows that your Transmit and Receive PHY rates are both 72.2Mbps. This suggests to me that your AP is set to use 20MHz-wide channels. However, if your AP really was only using 20MHz-wide channels, your measured throughput in a speed test would probably max out around 50Mbps, and would never even quite hit a full 60Mbps, much less 70Mbps. So those two data points seem to contradict each other a little bit; it's unclear if you're limited to 20MHz-wide channels or not.
Please note that even under perfect radio signal/noise conditions, your QCA9377 will never quite be able to get a full 120Mbps of throughput when talking to an 802.11n AP. You may be able to hit 105Mbps, but not 120. So if you want to get full 120Mbps wireless speeds to your laptop, you'll either need to upgrade your AP to AC, or upgrade your laptop's wireless networking card to support a faster flavor of 802.11n. Note that if your laptop only has a single internal antenna, you won't be able to just replace the internal wireless card to support two spatial streams. You would probably need to switch to an external USB Wi-Fi adapter instead.
If the wifi card is slower than the router, the wifi card speed is not surpassed. If you copy a file on a slow HDD, and that speed is slower than the wifi, then that decreases the speed even more. If your computer is very busy and the maximum speed is brought down by that, or if the wifi is very busy at that moment, it can also slow things down.
So the maximum theoretical speed is the maximum speed of the slowest device in the mix under optimal conditions. So lets assume that your computer is faster than the wifi speed of 300mbit your wifi card supports, then 300mbit is the fastest maximal speed you can get. A different laptop with a faster wifi card could reach the 450mbit under optimal conditions.
Wireless networking is the most convenient way of accessing the internet. Every year the number of users and devices accessing the internet increases. As a result, many people experience speed slow-downs and unreliable wireless connections. To reduce those challenges and improve your wireless experience, the WiFi-Alliance set up a new WiFi standard - 802.11ac.
The purpose of IEEE 802.11">WiFi standards is to improve the wireless local area network (WLAN, SD WAN, or Wireless LAN) user experience. New wireless standards are developed to fill gaps in the existing standards and to account for new technology.
The 4th WiFi generation (IEEE 802.11n) saw a big increase in the number of users and devices using wireless internet. This resulted in speed slowdowns and increased latency. To improve the 802.11n standard, the Institute of Electrical and Electronic Engineering developed the IEEE 802.11ac standard from 2008 to 2013. The improvements would result in a better WLAN experience - faster speeds, more bandwidth, and less latency. The updated standard was published in December 2013.
Two waves of products were launched using the 802.11ac standard. The first wave was introduced in 2013 and the second in 2015. The difference between these product waves will be discussed later in this article.
Maximum internet speeds are theoretical. They are based on the best conditions - potential interference is not factored in. 802.11ac has a theoretical maximum speed of 1,300 Mbps (1.3 Gbps) - 2,300 Mbps (2.3 Gbps), but this will depend on real world conditions. It was the first WiFi standard developed that could theoretically achieve gigabit speeds opposed to megabit speeds. In contrast, 802.11n had a theoretical speed of 450 Mbps (0.45 Gbps). This meant WiFi 5 could be up to 3x faster than the earlier WiFi generation under best conditions.
In the real-world, data rates are susceptible to change due to the environment. Obstacles like building material, walls, doors, floors, and furniture can interfere with the signal strength, resulting in the speed slowing down.
The 802.11n standard only supported 20 MHz and 40 MHz channels (bonds two 20 MHz channels). The first 802.11ac product wave supported a maximum of 80 MHz channel bandwidth. To improve on the first wave, the second wave of products took channel width to a different level. Wave 2 supports up to 160 MHz channel bandwidth. The 160 MHz channel improvement was achieved by bonding adjacent channels or non-adjacent 80 MHz channels (to create the 80+80 MHz channel). As a result, it improved throughput significantly.
Originally, 802.11n routers used SU-MIMO (Single-User Multiple-Input Multiple-Output), meaning that the router could only communicate with one connected device at a time. When 802.11ac Wave 1 was launched, there had not been any improvements done to the SU-MIMO technology. Wave 2 saw these improvements come to light.
Wave 2 802.11ac routers adopted MU-MIMO (Multi-User Multiple-Input Multiple-Output). Routers could now send information to multiple devices at the same time. The new technology only supported downlink (communication from the router to wireless devices) MU-MIMO, they could only send data to the client devices simultaneously. The information packets being sent to the wireless router (uplink) could only be sent one by one. This new technology improved speeds and supported more connected devices.
The iUAP-AC-M access point can blanket those hard-to-reach indoor and outdoor areas with reliable WiFi. Don't let WiFi dead spots slow down your business. With MU-MIMO, the iUAP-AC-M access point supports many devices at the same time. Users will experience faster speeds and less lag while working or relaxing.
To help improve the communication process and speeds, 802.11ac Wave 2 routers supported 4 spatial streams (later, up to 8). With the help of Multi-User MIMO, the clients requesting information did not have to wait in line. The router could give one antenna to the iPhone and two to the Mac at the same time. More information could be transmitted and received simultaneously. In addition, since the signal is being given more efficiently, power consumption is reduced which improves the battery life on the connected devices.
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