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xDSL Services

ADSL (Asymmetric Digital Subscriber Line)

ADSL as the name suggests is a digital subscriber line technology which is a data communications technology that enables faster data transmission over copper telephone lines. It is permanently switched on, unlike normal dial up access and is asymmetric in that it uses most of the available bandwidth downstream. This makes it particularly suitable for applications where customers expect to receive more data than they transmit such as for Web browsing, use of corporate intranets, and reception of digital audio-visual material. The technology also supports analogue connection on the same line, which enables voice or fax calls to be made simultaneously.


ADSL MAX is a faster ADSL technology which improves the speed of bandwidth available to your business and has typically faster upload and download speeds through ADSL connection.

Benefits of ADSL MAX

These include:

  • Higher upload and download speeds for business that rely on a high-speed internet connection
  • Availability across most of the UK, even in locations where ADSL is normally slow - lines can reach further and improve performance
  • A leased line alternative which is often much cheaper
  • Flexibility regarding how many ADSL circuits you decide to bond together


ADSL2+ extends the capability of basic ADSL by doubling the number of downstream bits. The data rates can be as high as 24 Mbit/s downstream and up to 1.4 Mbit/s upstream depending on the distance from the DSLAM to the customer's premises.

ADSL2+ is capable of doubling the frequency band of typical ADSL connections from 1.1 MHz to 2.2 MHz. This doubles the downstream data rates of the previous ADSL2 standard (which was up to 12 Mbit/s), and like the previous standards will degrade from its peak bitrate after a certain distance.

Also ADSL2+ allows port bonding. This is where multiple ports are physically provisioned to the end user and the total bandwidth is equal to the sum of all provisioned ports. So if 2 lines capable of 24 Mbit/s were bonded the end result would be a connection capable of 48 Mbit/s download and twice the original upload speed. Not all DSLAM vendors have implemented this functionality. ADSL2+ port bonding is also known as G.998.x or G.Bond.


SDSL (Symmetric Digital Subscriber Line) is a fixed-speed Internet access service with matching upstream and downstream data rates. That is, data can be sent to the Internet from the client machine or received from the Internet with equal bandwidth availability in both directions. Normally, DSL service is asymmetrical (ADSL), with the bulk of the bandwidth reserved for receiving data, not sending it.

SDSL utilises a digital frequency traveling across existing copper telephones lines to send and receive data. When using the telephone line for this service, phone and fax services on that line must be suspended. Therefore a dedicated second, or additional, line is typically needed. This differs from ADSL, which is capable of connecting standard analogue telephone equipment and the digital signal equipment to enable both voice and data traffic at the same time.

The SDSL service provided by BT is gradually being phased out and replaced by FTTC & FTTP. However, it does give a symmetrical option to those customers where fibre connections are not yet available

For more information please contact us or give us a call.

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