ADSL 2+

What is ADSL2+?
ADSL2+ extends the capability of basic ADSL by doubling the number of downstream bits. It accomplishes this through tweaking the methods ADSL uses to push data over your last-mile wire, with new technologies improving transmission efficiency and providing greater resilience to noise.

The data rates can be as high as 24 Mbps downstream and 1 Mbps upstream depending on the distance from the DSLAM to the customer's home; Although, typically, local ISP’s are only able to offer a maximum of 6Mpbs download and 1mbps upload speed.

ADSL2+ is still primarily only available in population dense metropolitan areas, but will undoubtedly move to the “burbs” in the future as the infrastructure is built out.

When it was first introduced, ADSL was a significant step forward in Internet access, since it didn't require the availability of cable service and could coexist with voice phone services.

Other types of DSL, such as SDSL (Symmetric Digital Subscriber Line), are used by businesses requiring a particular type of connection, but ADSL proved ideal for Internet use, with a download channel many times faster than its upload channel.

Why do I need higher speeds?
Upstream speed is mainly important if you frequently send large files, pictures or video to people, but the increased download speeds of ADSL2+ will deliver content at far faster speeds and enable the rapid transport of massive files, particularly videos and feature films.

For example, that means you will be able to download a feature-length movie from about 15 times faster than you could under the old 1.5Mbps speeds offered by most ISPs.

What do I need to get it?
To get those speeds, you'll need an ADSL2+ capable modem, and either a 3mbps or 6mbps package. Some clients will need to have a filter installed to allow for separation between voice and data paths on the same line. However, a new technology called Dry DSL or Naked DSL can be installed where a data only capable line is required (usually where VoIP service is used).

Is the ADSL2+ upload speed available anywhere?
The upload speed is not affected by distance from the DSLAM as significantly as the download speed is. A decrease of upload speed will be experienced with increased distance from the DSLAM, but users within 2km of their DSLAM are usually going to achieve close to maximum upload speed.

Note: There are other factors in addition to distance that will impact data transfer speeds such as quality of phone line, EMI (ElectroMagnetic Interference), the number and type of other services using the line, the capacity of the uplink and customer’s modem/router.

ADSL2+ Technology Reduces Crosstalk Effect
Telephone wires are bundled together in groups or “binders” containing 25 or more twisted wire pairs. As a result, electrical signals from one pair can affect or electromagnetically couple onto adjacent pairs in the binder group. This coupling is known as "crosstalk" and can result in poor ADSL performance, slow speeds or dropped connections.

ADSL2+ can be used to reduce crosstalk. ADSL2+ provides the capability to use only tones between 1.1 MHz and 2.2 MHz by ‘masking’ the downstream frequencies below 1.1 MHz. This can be particularly useful when ADSL services from both the central office and a remote terminal are present in the same binder group as they approach customers' homes or offices.

This masking eliminates most of the crosstalk between the services and preserve data rates on the line from the central office.

For more information, please call us at 604.248.4848 or e-mail This e-mail address is being protected from spambots. You need JavaScript enabled to view it .