ADSL2 and ADSL2+ What are they, how do they work and how is it different from an ADSL Internet connection?

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

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

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

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

These two technologies ADSL2 and ADSL26 have been designed mainly 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. Upstream speeds are generally limited, however.

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, a special device must simply be installed in the switchboard, this allows this same service to be offered in a simpler way to a greater number of users.

In the case that the client has a high-end router and last generation then you will not need any other device to perform this installation. Since, generally, these devices come configured to be able to support these two technologies. In the case of ADSL2 in many occasions it is offered to contract a system of television IP, it is this way as it takes charge of assigning a bandwidth available for several types of digital services.

How does ADSL2 improve on classic ADSL connections? Main Differences

ADSL2 has been a technology created with the main objective of improving the classic ADSL connections, this in order that the users can begin to experience a better service and a better performance of the same one. This is based mainly on improving the speed of the connection and other aspects necessary to ensure optimal performance. Therefore, here we are going to show you the main differences between both and how ADSL2 improves on classic ADSL.

Improved transfer speed

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

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

Network status monitoring

There is no doubt that the new ADSL2 system is in charge of improving the devices that provide this type of service, and which are destined to be able to add a great amount of facilities that allow diagnoses to be made in a much easier way. Whether it is for the installation phase of the system, for its use or for the improvement of the service.

Therefore, with these diagnostics carried out, it is possible to measure the power of the line noise signal, the attenuation of the loop and the signal to noise ratio (SNR). This will allow the current connection status to be monitored, helping to ensure that it is in optimum working order at all times. It will also allow the status of the infrastructure to be assessed and whether the terminal is capable of providing better data transfer rates.

Adaptive connection speed

Another improvement over traditional ADSL systems is that these traditional systems often present problems when increasing the transfer rate, due to the high crosstalk produced by the telephone wires.

Therefore, the ADSL2 service is in charge of improving all these aspects, for this it carries out a supervision of 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 avoiding 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 with respect to the traditional system in order to reduce energy consumption by all providers of this broadband service. All this is aimed at better optimizing all the energy resources wasted by traditional ADSL.

This means that 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 one or two rest times can be added so that these devices are not forced to work continuously. Without a doubt, this becomes an economic saving for all or almost all providers.

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

Data buffer optimization

Data buffer optimization is another of the best of this system, as this is what will make ADSL2 able to have a higher transfer rate. This is because the data buffers are in charge of storing frames in case the line gets congested. While in the classic ADSL this buffer is fixed, so it does not have response capacity in the moments of congestion.

In this way, ADSL2 takes advantage of the spaces that are not used by the buffer in order to achieve an increase in download speed of up to 50 Kbps and at the same time allows the bandwidth reserved for the telephone service to be used for data transmission, achieving an upload speed of 256 Kbps.

Previously, the time to make the initial connection between the provider and client was 10 seconds with classic ADSL, while with ADSL2 this 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 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 referring to the specifications of “Inverse Multiplexing for ATM” or also known as IMA.

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

All this means that each terminal treats all these phone lines as a single connection. In order to be able to do this, a series of sub-protocols arrive from the desynchronization of the physical ADSL2 devices, where they treat the information received from the devices when they have different latencies.

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

You may be thinking about upgrading your broadband 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 there are only three companies that offer this service and which we are going to introduce you to below:


The first company we present to you is Wanadoo, which launched this ADSL2 offer recently. However, Wanadoo has not been able to offer this technology in all its expression, since many of its users have stated that they still do not receive the speeds contracted in the service, so the real speeds are much lower.

So far, it has not been possible to meet a customer who manages 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 client does not manage to synchronize these speeds, discounts will be offered for not receiving the service in full.

Among the services offered in their plans you can find 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. To do this, they offer a router with a 24-hour connection, and the best thing about it is that they do not require a commitment to stay on to contract it.


Superbanda is another provider of this type of service. It is opening several of its own centres with the aim of offering a better service. This is because it has had many problems in recent months with France Telecom, the company with which it works today. However, Superbanda is characterized by offering the lowest rates in the market.

In this way, Superband offers ADSL2+ speed of up to 20MB/1MB through a WiFi router with a 24-hour connection schedule. Among the added services you can find what are 15 pop accounts of 100 MB and a web space of 50 MB.


Jazztel is one of the most popular companies in Spain and became the first to offer this type of ADSL2+ broadband connection system. Due to this and to its great popularity in the country, it has been presenting some inconveniences at the time of installing this service, since there are so many clients 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 it is also 20 megas / 1 mega, where you must use 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 close to 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 hiring any of these rates you can do so by entering this link where you can find all the necessary information to make you the services of 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 an ADSL2 or fiber optic connection will depend mainly on the needs of each user. That is, if you are one of those people who does not require a very fast speed to make use of your Internet connection then it is best to get an ADSL connection.

It is important to note that even though this second generation ADSL technology offers higher connection speeds it is still less than that offered by fiber optic systems. In addition, the speed received by ADSL2 services is not real, that is, the user will always receive a lower speed than that contracted. Otherwise, what happens with FTTH, where the user will receive a real speed, that is, if he contracts 50Mbps he will receive the 50 Mbps.

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

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

This post is also available in: Português (Portuguese (Brazil))

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