ADSL (Asymmetric Digital Subscriber Line) belongs to the family of xDSL technologies which have the common feature of being based on the traditional telephone network. As you look into the unifi 300mbps you can understand its potency.
This technology has two disadvantages:
It is “asymmetric”, which means that the downstream speed (from the network to the user) is greater than the upstream speed (from the user to the network). Basically, the connection is much faster when the user receives a file compared to sending the file.
The speed is capped at 25 Mbits per second, even in its latest version, ADSL 2+. In addition, this is only theoretical; the speed tends to degrade as the distance from your telephone exchange increases.
It is the fastest data transmission technology available today. It can reach a speed much higher than ADSL, of the order of 1 Gbits per second! To give you an idea, downloading a movie in HD only takes a few minutes in optical fibre, a musical album, a few seconds etc.
Other advantages, the flow is symmetrical, the upward flow is equal to the downstream flow, and the latency time is very short.
Why is it so fast? Optical fibre is based on the principle of refraction of light (back to physics lessons ) To make it very simple, data is transmitted by light, and we know that the speed of light is extremely high, it is for that this technology achieves record speeds of transmission!
An interesting alternative to ADSL is that it provides access to the Internet at very high speed and high definition television channels. Its performance remains below optical fibre but is better than ADSL.
3G, 4G & Wi-Fi
These are technologies that use airwaves to broadcast the internet stream. The Wi-Fi (Wireless Fidelity) is a wireless local area network, it will depend on a material that specifically located to where you are and in a radius of about 60 meters around the diffuser.
The 3G or 4G (just faster than 3G) provide internet access via the cellular network, the network of major cellular operators. It’s like WI-Fi, but available just about anywhere. You should know that today, 4G is much faster than Wi-Fi, theoretically up to 300 Mbits per second depending on your phone, and your distance from the antenna.