Difference Between Similar Terms and Objects

Difference Between ADSL and VDSL


Very High Bitrate Digital Subscriber Line or VDSL/VHDSL is an improved version of the technology, ADSL or Asymmetric Digital Subscriber Line, which we use to connect to the internet. They are different in how they are implemented so you probably cannot use the equipment of one for the other. The most significant difference between the two technologies that is most relevant to the use is speed. ADSL can reach maximum speeds of 8mbps download and 1mbps for upload. In comparison, VDSL can have up to 52mbps for download and 16mbps for upload.

Because of the extremely high speeds that VDSL can accommodate, it is being looked at as a good prospective technology for accommodating high bandwidth applications like VoIP telephony and even HDTV transmission, which ADSL is not capable of. Another very useful feature of VDSL stems from the fact that it uses 7 different frequency bands for the transmission of data. The user then has the power to customize whether each frequency band would be used for download or upload. This kind of flexibility is very nice in case you need to host certain files that are to be downloaded by a lot of people.

The most major drawback for VDSL is the distance it needs to be from the telephone exchange. Within 300m, you may still get close to maximum speed but beyond that, the line quality and the speed deteriorates rather quickly. Because of this, ADSL is still preferable unless you live extremely close to the telephone exchange of the company that you are subscribed to. Most VDSL subscribers are companies who need a very fast server and would often place their own servers in very close proximity.

Due to the limitations of VDSL and its high price, its expansion is not as prolific as that of ADSL. VDSL is only widespread in countries like South Korea and Japan. While other countries also have VDSL offerings, it is only handled from a few companies; mostly one or two in most countries. In comparison, ADSL is very widely used and all countries that offer high speed internet offer ADSL.


1. VDSL is significantly faster than ADSL

2. VDSL is able to support HDTV while ADSL can not

3. VDSL allows for customizable bandwidths while ADSL does not

4. VDSL suffers from attenuation much quicker compared to ADSL

5. ADSL is still better for homes that are much farther from the DSLAM

6. VDSL is not as widespread as ADSL is

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  1. Friendships persist each time every different mate is convinced she has a slight brilliance above the alternative.

  2. No that is not correct Adsl can still run HDTV the only difference from adsl and vdsl are the frequency range on wich they are run and the rate in wich they attenuate Adsl being 20khs to 1.1m and Vdsl 25khz to 8.8m vectored to 17m both can run ipdsl VoIP and HDTV

    • @Danny: This article is correct. What you’re saying is not. You are talking about ADSL2 or ADSL2+. This article is talking about ADSL, wich is 4KHz when it comes to frequency.
      There are 192 channels of 4KHz each for download and 64 channels of 4KHz each for upload. These 192 channels of 4KHz each, provide a maximum bandwith of 8Mbps. This is ADSL.
      When it comes to ADSL2 or ADSL2+, what you’ve said may become true.

      • Daniel, you and the article are wrong, and Danny is right. I am watching HDTV on my old ADSL without real issues, and the quality is great. And rest assured, it is not ADSL2 or 2+.

  3. No, No Dummy, You, the article and Daniel are wrong. marammaji and Danny are right. We can even watch UHDTV on dial-up if it is multi homed with optical fiber.

    • No Rajagopi, you are wrong, along with mrammaji and Danny. Dummy, Daniel, the article and Dr Seuss are correct; “I do not like green eggs and ham. I do not like them Sam-I-Am.”
      Ali Baba also has a valid point.


  5. VDSL2 comes in different profiles, allowing for output of up to around 200mb+. In Australia we use Profile 17a with upward compatibility for Profile 30a.

  6. Koera and Japan? Folks I am living in Bosnia, and I use VSDL line. I am not sure if this is technology so strane for no so developed countries.

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