Difference Between ADSL and ADSL2 (With Table)

Accessing the internet whenever you want is virtually as essential as breathing in today’s world. It follows that we need a connection to the internet that provides us with an assurance of a constant and safe data transfer rate. When it comes to achieving this, a broadband connection is one of the best choices, and Adsl (Asymmetric Digital Subscriber Line) is a common choice for high-speed Internet access.


The main difference between ADSL and ADSL2 is that ADSL2 is an upgraded version that may reach a max speed of 12Mbps (megabytes per second), whereas ADSL is limited to 8Mbps. Using the same amount of copper cables and junction boxes, ADSL2 may go farther than the primary type.

In the broadband world, ADSL is the most common or fundamental model. Connecting to the internet via a telephone subscriber line is possible with this technology. The widespread usage of internet technology in both homes and workplaces is cost-effective and straightforward to implement. It connects your computer to the internet using the same copper cables that link your phone to the wall.

Broadband ADSL has been upgraded to ADSL2. Comparatively, it provides a more reliable and speedier connection to the internet than the former. Asymmetric Digital Subscriber Line 2 is backwards-compatible with Asymmetric Digital Subscriber Line 1. With ADSL2, you’ll be able to transfer data at a faster rate.

Comparison Table Between ADSL and ADSL2

Parameters of ComparisonADSLADSL2
ApprovalIn 1998, the ADSL 1.0 standard was approved by the International Telecommunications Union.It was between 2002 and 2007 that the first ADSL2 specification was approved.
VersionIn terms of ADSL broadband technology, this is the simplest form.A new version of ADSL broadband is now available.
ReachIt has a lesser distance to travel.With the same set of cables, it’s possible to go farther.
Data SpeedThere’s a maximum data transfer rate of 8Mbps.Data transfer speeds can reach 12Mbps in this area.
Noise ResistanceADSL has a low noise immunity rating.ADSL2 is more resistant to noise than ADSL1.
CompatibilityAs a result, it cannot be used with ADSL2.Unlike ADSL, this service is backwards compatible.

What is ADSL?

In recent years, broadband technology has emerged as a lifesaver, particularly in offices and homes requiring high data speeds. ADSL uses the everyday two-wire pair already installed in the telephone system to establish an internet connection. Because of its asymmetric bandwidth & bit rate, ADSL is more famous for downstream applications than for upstream applications.

ADSL is mainly used for internet connection, which allows for downloading large files and other large files. For the most part, users of this software have focused on downloading rather than browsing.. 8Mbps is the highest possible data transfer rate. The cellphones employ a spectrum band above the band that is now in use to deliver this data speed.

ADSL is deployed for short distances between the telephone exchange and the customer’s home or workplace. ADSL2 outperforms basic ADSL in distance coverage to achieve higher data rates, assuming that all other specifications are maintained at their current levels. Noise is something that ADSL can only deal with to a certain extent, but ADSL performs far better here.

Despite this, ADSL continues to be the most popular choice for most people living in their houses. Customers prefer ADSL modems because they provide a faster connection speed, and home users who prioritize faster download speeds will find ADSL an appropriate choice. Full duplex communication can achieve this goal by frequency division or echo cancellation.

What is ADSL2?

When things change over time, so do people’s circumstances and demands. If you’re going to do something, you might as well do it right. That leaves only technological innovation as a remedy. ADSL2 (Asymmetric Digital Subscriber Line 2) is the first ADSL broadband technology upgrade.

ADSL2 is based on the same technology as ADSL basic, but it offers a noticeably quicker internet connection. ADSL2 uses the same amount of bandwidth as ADSL. Because the enhanced version is backwards compatible with the original, any ADSL2 equipment currently on the market can also operate following the original’s specifications.

To access the internet from areas far from the exchange, it’s recommended that you upgrade to the higher-end model. With the same amount of copper wires, ADSL2 can reach farther distances. A result of this is a significant increase in ADSL2’s transfer and transmission speeds.”. Even though it offers a few improvements over the previous model, it is less common. As a result, ADSL is becoming more popular in residential and commercial settings.

Improved modulation efficiency, signal processing methods, and smooth rate adaptation (SRA) are some of ADSL2’s prominent features. As network requirements change, SRA allows transmission rates also to be changed. In addition, ADSL2 maintains the transmission’s synchrony.

Main Differences Between ADSL and ADSL2

  1. ADSL is the most basic ADSL broadband technology, whereas ADSL2 is an enhanced version of the same technology.
  2. Between 2002 and 2007, the two standards for ADSL2 were accepted, the original standard in 1998 and ADSL2 in 2002.
  3. ADSL ADSL2 can transmit data over more considerable distances using copper cables.
  4. Compared to ADSL2’s top data speed of 12Mbps, ADSL2’s maximum data speed is 8Mbps.
  5. The noise-resistance capacity of ADSL2 is higher than that of ADSL.
  6. Using all the upgraded version equipment with the original ADSL specifications is feasible. Still, it is impossible to use it with the original ADSL specifications.


Humans currently rely on the internet as their primary source of energy. It’s impossible to fathom life without it. Internet connectivity makes it possible for us to do, say, and learn anything we desire. Because of this, a fast and all-around internet connection is among the most sought-after items nowadays.

Internet connectivity is frequently provided through the use of broadband technologies. In addition to ADSL, several other modems can be used. Following the introduction of ADSL, a second type was established; ADSL2.

ADSL2 is an upgraded version of ADSL that provides quicker & better internet connectivity than ADSL. ADSL2 provides several advantages above the basic model in terms of technology. However, both modems utilize the same technology.


  1. https://www.researchgate.net/profile/Tilemachos-Doukoglou/publication/268337051_A_comparative_Performance_Evaluation_of_the_ADSL2_and_ADSL_Technologies/links/5568399108aec226830119a0/A-comparative-Performance-Evaluation-of-the-ADSL2-and-ADSL-Technologies.pdf
  2. https://ieeexplore.ieee.org/abstract/document/1630319/