Home / 🌐Internet / 📡 Networks / ADSL2 and ADSL2+ What are they, how do they work and how is it different from the ADSL Internet connection?

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The broadband market is one of the markets that has grown the most in recent years, and it also continues with the growth advances where it has been favoured with a large number of standards approvals , All this has led them to renew all the infrastructures , thus becoming one of the most profitable markets today .

In the case of ADSL service great progress has been made, and thanks to the second generation of this ADSL2 and ADSL 2+ service a higher browsing speed can be achieved due to an increase in bandwidth .

This ADSL2 and ADSL2+ technology is currently one of the best known and used throughout Spain , so here we will explain a little more about what it is and how this new service works, which comes hand in hand with ADSL Internet service .


What is ADSL2 and ADSL2+ and what are these Internet connections for?

These two technologies ADSL2 and ADSL26 have been designed primarily to improve the Internet speed of ADSL , so these two systems are able to offer maximum connection speeds of 8 and 24 Mbps downstream , while 1 and 2 Mbps upstream . However, upload speeds are generally limited.

Therefore, the main objective of these two systems is to be able to take advantage of the entire ADSL infrastructure , which will operate from it. In this case you simply need to install a special device in the switchboard, this allows you to offer this same service in a simpler way to a larger number of users .

In the case that the customer has a high-end, state-of-the-art router then no other device will be needed to perform this installation. As these devices are generally configured to be able to support both of these technologies . In the case of ADSL2 it is often offered for contracting an IP television system , this is how it is assigned a bandwidth available for various types of digital services .

How does ADSL2 improve on classic ADSL connections? Main differences

ADSL2 is a technology created with the main objective of improving classic ADSL connections, this so that users can start to experience better service and performance . This is mainly based on improving the connection speed and other aspects necessary to be able to ensure optimum performance . Therefore, here we will show you the main differences between both and how ADSL2 improves on classic ADSL .

Transfer speed improvement

Without a doubt, the main objective of this new technology is to improve the speed of transfer with respect to that of classic ADSL . To this end, it is responsible for extending the frequency used for data transfer downwards to 2.2 megacycles . This will enable you to download data at a maximum speed of 24 Mbps on long-distance telephone lines, all this in the case of ADSL2+ .

While in the case of ADSL2, can reach a maximum download speed of up to 12 Mbps , and the frequency used for data transfer downstream can be as high as 1.1 megacycles .

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Network status monitoring

There is no doubt that the new ADSL2 system is responsible for improving the devices that provide this type of service , and which are destined to be able to add a large number of facilities that allow to carry out diagnostics in a much simpler way. either for the installation phase of , for its use or for the improvement of the service.

Therefore, with these diagnostics performed it is possible to measure what is the power of the line noise signal, the loop attenuation and the signal to noise ratio (SNR). This will allow the status of the current connection to be monitored, which will help to ensure that it is in optimum working order at all times . As well as being able to assess the state of the infrastructure and whether the terminal is capable of providing better data transfer rates .


Adaptive connection speed

Another improvement that can be found with respect to traditional ADSL systems, is that these traditional systems often present problems when increasing the transfer rate , because of the high crosstalk produced by the telephone wires .

Therefore, the ADSL2 service is responsible for improving all these aspects by monitoring the amount of distortion and noise in the medium . This is achieved by varying the transfer rate to the maximum possible without the need to lose the quality of the connection and thus avoid possible errors .

In this way, the speed adjustment that is made is done in a transparent way , where some mechanisms are used that allow the change of transfer speed without generating failures in the system when processing the different information.

Improved energy management

ADSL2 has introduced a large number of improvements to its system compared to the traditional system in order to reduce energy consumption by all providers of this broadband service . All of this is to ensure that the energy resources wasted by traditional ADSL can be better optimised .

That is to say, previously with this service the teams in charge of promoting this type of connection had to be connected all the time , now with this new technology you can add one or two rest times so that these devices are not forced to work continuously . This undoubtedly becomes a economic saving for all or almost all providers.

In order to achieve this, it is necessary to make use of two energy modes , both from L2 and L3 , where the L2 energy mode will be responsible for regulating the energy according to the traffic that circulates between the customer’s connection and the supplier . Whereas is the L3 mode , it is responsible for establishing a more dormant state which will be introduced when the connection is not being used for a long period of time .

Data buffer optimization

Data buffer optimisation is another of the most important improvements of this system, as this is what will make the ADSL2 able to have a higher transfer rate. This is because the data buffers are responsible for storing frames in case the line becomes congested . While in the classic ADSL this buffer is fixed , so it does not present response capacity in the moments of congestion .

This way, the ADSL2 takes advantage of the spaces that are not used by the buffer so that can achieve an increase in download speed of up to 50 Kbps and in turn allows the bandwidth reserved for the telephone service to be used in the transmission of data achieving an upload speed of 256 Kbps.

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Previously the time for making the initial connection between provider and customer was 10 seconds with the classic ADSL , while with the ADSL2 time has been reduced to 3 seconds .

Improved speed with multiple phone lines

This new ADSL2 technology allows you to use more than one phone line to provide this connection service to a single terminal , which allows you to improve the speed of the connection. For all this it includes in its standard different ATM standards concerning the specifications of “Reverse Multiplexing for ATM” or also known as IMA .

This is what ends up allowing the demultiplexing of the different ADSL connections of the different telephone lines to be brought to a single device, which will increase considerably the rate of descent . Therefore, from the ATM layer all the data that is received through the sublayer which is provided by IMA is processed to be able to process the data that arrives from the physical ADSL layers .

All this leads to each terminal treating all these phone lines as a single connection. To do this we use a series of sub-protocols that come from the desynchronisation of the physical ADSL2 devices, where they treat the information received from the devices when these have different latencies .

List of the best ASDSL2 and ADSL2+ providers in Spain and their rates

You may be thinking about upgrading your broadband connection service, either to the new ADSL2 and ADSL2+ technology. However, to do this you must know which providers are currently offering this type of service in Spain .

It is important to mention that so far only there are three companies that offer this service and we will introduce them to you below:


The first company we present to you is Wanadoo, which launched this ADSL2 offering recently came out. However, Wanadoo has not been able to offer this technology in its entirety, as many of its users have stated that they still do not receive the speeds contracted in the service, therefore the real speeds are far below .

So far, we have not been able to find a client who has managed to receive the 20 megabytes offered by Wanadoo, as connections are barely reaching 15 megabytes. The company’s main objective is to offer speeds of up to 20MB/ 1MB, but if the customer fails to synchronise these speeds discounts will be offered for not receiving the full service.

Among the services offered in their plans is a section for the web and mail where the client can enjoy 15 accounts of 100 Mb, a POP3 access and 100 Mb of web space. It offers a router with a 24-hour connection , and best of all, does not require a commitment of permanence for the hiring of the same.


Superband is another of the providers of this type of service , it is opening several own centrals with the aim of being able to offer a better service. This is because he has had many problems in recent months with France Telecom , the company he works with today. However, Superband is characterised by offering the lowest rates on the market.

Thus, Superband offers a ADSL2+ speed of up to 20MB/1MB via a WiFi router equipment with a 24 hour connection schedule . Between the added services you can find what are 15 pop accounts of 100 MB and a web space of 50 MB .

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Jazztel is one of the most popular companies in Spain and the first to offer this type of ADSL2+ broadband connection system. Due to this and its great popularity in the country, it has been presenting some inconveniences at the time of installing said service , since as there are so many customers who want to join them , they have presented many limitations in the procedures .

This has undoubtedly caused complaints about the delay in services , as it usually takes a long time from the time the service is requested until it starts working. In the case of the speed offered by Jazztel is also 20 megas / 1 mega, where you must make use of a router or USB modem of either of these two models: Huawei SmartAX MT882 or Comtrend 536.

Unlike the other two companies, in this case customers will be able to enjoy connection speeds between 16 and 18 megabytes as long as they are near the exchanges , otherwise this will decrease according to the distance between the supplier and the customer .

Knowing the three main operators of this service in Spain , and the speeds offered by each of them , you will surely want to take advantage of some of their services. Therefore, if you are interested in , you can sign up for by clicking on this link where you will find all the necessary information to sign up for from some of these three Internet providers .

Is it worth hiring ADSL2 or is it better to scale up to FTTH (fiber optic)?

Being able to choose between a ADSL2 or fibre optic connection will depend mainly on the needs of each user. That is, if you are one of those people who doesn’t require a very fast speed to make use of your internet connection then it’s best to get a ADSL connection.

It is important to note that although this second generation ADSL technology offers higher connection speeds it is still less than that offered by fibre optic systems. Furthermore, the speed received by ADSL2 services is not real, i.e. the user will always receive a lower speed than the contracted one. Otherwise, the case with theFTTH , where the user will receive a real speed, i.e. if he contracts 50Mbps he will receive the 50 Mbps.

In case you need a Internet connection to view streaming content to work with multimedia content or to download Torrent files it is best that you get a FTTH service , where operators will allow you to contract the speed that you think is necessary either 50 Mbps, 100 Mbps, 500 Mbps, 600 Mbps or up to 1 Gbps.

Therefore, with this service of fiber optic connection you will be able to hire the speed you think is necessary for what you need . This means that if you have an ADSL service at home and you want to upgrade it, the best thing to do is to go directly to the fibre optic, there you will be able to enjoy a better browsing speed when using the service .

If you want to know more about the differences between optical fiber and conventional ADSL, read this post .

If you have any questions, leave them in the comments, we will answer you as soon as possible, and for sure it will be of a great help for other members of the community. Thank you! 😉


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