DSL internet providers offer a fast internet access over old telephone lines. At the same time you could talk on the phone and use the internet connection without any interference between.

DSL Internet Providers and Technology They are Using

DSL – Digital Subscriber Line

Digital subscriber line (DSL) is a technology which enables fast broadband internet access over the existing old phone lines. What it makes different from a dial up service, is that DSL offers incomparably faster internet connection.

Simultaneous phone call with the internet is also an option which isn’t possible with the classical dial up internet connection. This is possible because the digital signal for the high speed internet uses higher frequency and at the same time two different signals can coexist on the same line.

Splitter or DSL filter on the subscriber side splits one line in two – one for the phone and another for the DSL modem. DSL internet provider at the telephone exchange uses DSLAM – Digital subscriber line access multiplexer.

DSL is just one of the ten types of last mile connections. Check other nine types on Last mile.

Types of DSL

DSL family has many different DSL members. These three are most common:

  • ADSL
  • HDSL
  • VDSL

ADSL – Asymmetric Digital Subscriber Line

ADSL – Asymmetric Digital Subscriber Line is called asymmetric duplex bandwidth is divided in two directions downstream and upstream. Downstream direction from the Internet toward the subscriber usually takes much more bandwidth. Upstream direction from the subscriber takes less bandwidth. The new ADSL technology ADSL2+ enables download speeds up to 24 Mbps and upload speeds of 3.3 Mbps.

HDSL – High-bit-rate Digital Subscriber Line

HDSL – High-bit-rate Digital Subscriber Line provides symmetric bandwidth in both directions. Downstream and upstream have the speed of 1.5 Mbps.

VDSL – Very-high-bit-rate Digital Subscriber Line

VDSL – Very-high-bit-rate digital subscriber line provides higher speeds. Downstream speed is up to 52 Mbps and a maximum upstream speed is 16 Mbps. Newest VDSL2 enables even faster speeds 100 Mbps in downstream at about 500 meters (1600 feet) and about 50 Mbps at a distance of 1 km (3300 feet).

DSL Equipment


Two pieces of equipment are the most responsible for the DSL technology.

  • DSLAM – on the side of the DSL internet provider
  • DSL modem – on the customer side.

DSLAM – Digital Subscriber Line Access Multiplexer

DSLAM is the brain of the DSL system. It is situated at the telephone exchange. It takes many links to the different customers, aggregates and connects them to the internet. Some of the DSLAMs also have basic routing functionality and DHCP.

DSL Modem

The DSL modem at the customer side connects user equipment to the DSL line. Usually in the same device is the modem and a wireless router.

Broadband wireless routers have many functionalities in the same time. They have the following features:

  • DSL modem
  • wireless access point
  • router
  • DHCP server
  • firewall.

More about broadband wireless routers read in the broadband wireless router.

The Best DSL Internet Providers

If you are looking for DSL internet provider which is the best for you, you need to consider the following things:

  • availability
  • customer service and technical support
  • price
  • dependability of the DSL access and services running over DSL line
  • hardware – the quality of the DSL modem and other equipment you get with the DSL internet service.

Read also the post about the DSL – What does DSL mean? DSL Definition and Explanation

My advice for you is that you compare all the DSL internet providers that are available in your area on DSL internet and check the points I have just mentioned.

If you are interested about getting the wireless internet access, check my post Wireless internet service providers.

  1. Brighter Bills says:

    The main disadvantage of DSL, however, is that it’s not available everywhere. And the farther you live from the provider’s office, the slower your internet will be. A satellite internet can be your next best option in this case.

Leave a Reply