Difference Between ADSL and VDSL

Internet connectivity is a crucial criterion with the global economy. The speed of the internet plays a pivotal role, and most of us are dependent on it.


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The emails, images, multimedia depend on the speed of the internet. Even our entertainment units at home are dependent on network connectivity. Both ADSL and VDSL are two types of internet connections.


The difference between ADSL and VDSL is that ADSL works with copper lines and can transfer a large amount of data. It is a cost-effective connection for the internet at a faster pace. You can access the internet even while on call and has minimal installation and maintenance cost. The VDSL is a fast option to transfer data when compared to ADSL. The shorter the distance, the quicker the speed, and VDSL provides High definition television and video on demand.


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ADSL stands for Asymmetric Digital Subscriber Line, and it is responsible for faster data transmission through copper wire. The ADSL connection is an uninterrupted broadband connection.

ADSL broadband is cost-effective and best suited for startups. ADSL covers a distance of 18000 feet, offers low data rates, and gets extensively utilized compared to VDSL.

VDSL stands for Very High Bitrate Digital Subscriber Line, and it is a new technology and offers a better transmit of internet signal. VDSL provides high speed and runs SKYPE or YouTube smoothly without any lag.

VDSL has high internet speed, and uploading or downloading files happens smoothly. VDSL signal travels quicker when compared to ADSL.

Comparison Table

Parameters of ComparisonADSLVDSL
DistanceIt covers around 18,000 ft.It covers around 4,500 ft.
UsageIt is used extensively as a coverage area is more.Not used extensively due to cost.
Speed8 Mbps downstream and 1 Mbps upstream.55 Mbps downstream and 2.5 Mbps upstream.
ApplicationHigh-definition TV and video on demand.Internal Access.
MaterialTwisted Cable split into three bands.Fiber optic or twisted cable.

What is ADSL?

ADSL is a well-liked and aged type of broadband, and it functions with the assistance of copper wires. It uses subsist phone lines. It gets used for property broadband and tiny businesses.

  • Ir runs through the BT phone line network
  • High-quality bandwidth connection
  • Allows quicker transfer of data via a single network
  • Internet access and phone calls simultaneously get connected
  • Minimal installation costs and maintenance charges

Asymmetrical Digital Subscriber Line (ADSL) is the distribution of bandwidth that is not uniform. It provides unequal data distribution rates upstream and downstream. The rate downstream is higher than upstream.

The twisted-pair cable bandwidth (1 Megahertz) gets split into three bandwidths by ADSL. 

  • The first bandwidth between 0-25 kHz gets utilized for telephone service(POTS). The service allows only 4KHz of the band, and the rest is the guard band which differentiates the sound channel from the figures channel. 
  • The second bandwidth from the range 20 to 200 kHz gets used for upstream communication.
  • The third bandwidth ranges from 200 to 1MHz is for downstream communication.

The ADSL technology covers a distance of 18000 feet. ADSL broadband is cost-effective and the most effective way to access the internet for a mid-sized company or startup.

With speeds of 24Mbps for downloads and 8 Mbps to upload, it is perfect for any company. ADSL gets accessed through an ethernet cable and router that enables WiFi.

What is VDSL?

Very High Bitrate Digital Subscriber Line(VDSL) is a DSL (Digital Subscriber Line) technology. It provides faster data than ADSL AND ADSL2 technology.

An optical fiber or copper wire gets utilized to transport high-speed internet to your device. A modem is a device that connects a device to the internet.

VDSL requires a modem to maintain optimal internet speeds. VDSL gives the option to use the phone even while connected to the internet. 

The data speed is around 13 Mbps to 55 Mbps over a short distance. The brief the interval, the greater the momentum. VDSL enables the user to upload, download and mechanize the data swiftly. 

VDSL gets considered next-generation DSL, transferring data at 52Mbps downstream and 12 Mbps upstream. 

VDSL composition gets based on two technologies, Quarantine Amplitude Modulation(QAM) and Discrete Multitone Modulation(DMT). Both these technologies are not compatible with each other. 

DMT technology gets utilized by equipment manufacture, and VDSL uses DMT and consists of 247 virtual channels based on the available bandwidth.

VDSL caters to amenities such as video-on-demand(VOD) and high-definition television(HDTV) along with Internet access. VDSL gets combined with HDTV as a perfect combination in the marketplace.

The VDSL is limited to short distances but ensures maximum speed. VDSL is not a widespread technology as the price is high and distance limited.

Main Differences Between ADSL and VDSL

  1. The upstream speed is between 64Kbps to 1Mbps, and the downstream pace is 500Kbps to 8Mbps in ADSL. In VDSL, the upstream is 1.5-2.5 Mbps, and the downstream is 50-55Mbps.
  2. It covers a distance of 18000 feet in ADSL. In VDSL, it reaches feet of 4500 feet.
  3. In ADSL, Data and POTS lines get shared. In VDSL, Symmetic data and POTS lines get connected.
  4. We can access the internet and video on demand in ADSL. In VDSL, you can access the internet.
  5. ADSL is Asymmetric Digital Subscriber Line. VDSL indicates Very High Bitrate Digital Subscriber Line.
Difference Between ADSL and VDSL
  1. https://digital-library.theiet.org/content/journals/10.1049/ip-smt_20031072
  2. https://ieeexplore.ieee.org/abstract/document/680442/
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