What is VDSL?
VDSL stands for “very high bit-rate digital subscriber line”. It’s a standard that was developed from the same DSL technology that is commonly used to deliver broadband connections to millions of residential and commercial installations worldwide. But VDSL is much faster than commonly available DSL service.
VDSL (Very High Bit Rate Digital Subscriber Line) is a new and exciting technology that allows video, Internet and telephone service to operate simultaneously over the existing copper telephone wire coming into your office and home today. VDSL is extremely fast asymmetric DSL technology, providing data and POTS service on a single twisted pair. VDSL is reserved for users in close proximity to a central office, and the closer the better: within 5,000 feet you can reach downstream speeds of 13 Mbps and at 1,000 feet download speeds of up to 52 Mbps can be achieved. VDSL has not been standardized and some chip vendors have demonstrated 52 Mbps symmetric in short loops.
VDSL (Very high bit-rate Digital Line Subscriber) is next generation DSL at super-accelerated rates of 52 mbps (megabytes per second) downstream and 12 mbps upstream. Downstream data rates refer to download speeds, or the speed at which data travels to your computer, while upstream data rates refer to upload speeds, or the speed at which data travels from your computer to the Internet. VDSL architecture is based one of two technologies: QAM (Quadrature amplitude modulation) or DMT (Discrete multitone modulation). These two technologies are not compatible with each other and according to many manufacturers, DMT is more commonly used. VDSL is so hardy that it is capable of providing services like HDTV and Video-on-Demand along with Internet access, and will be bundled with HDTV packages as it establishes a presence in the marketplace. It is the first high-speed technology that can provide an entire home-entertainment package, making it entirely unique. As demand grows, the price of VDSL
VDSL: Very high bit-rate DSL – This is the fastest of xDSL technologies (45mbps) but only works only over a very short distance (approximately 4000 feet or 1200m). Bell is using this technology to allow customers in multiple-dwelling units (MDU’s) to get ExpressVu television in places where it is not feasible, desireable, or allowed to install a satellite dish. Internet speeds are not offered any faster than standard residential ADSL offerings. The majority of the bandwidth is used to deliver television signals. Here is an example of the equipment used: »broadband.motorola.com/catalog/p···ctID=365 You will find this service in a select few high-rise or high-density residential developments in major cities, usually condominiums.
Very-High-Data-Rate Digital Subscriber Line (VDSL) is an emerging broadband technology that promises much higher data rates over relatively short distances (between 51 and 55 Mbps over lines up to 4,000 feet in length). VDSL is seen by many as the next step in providing a complete home-communications and entertainment package. For example, the broadband internet access VDSL affords will support high definition TV. Some companies currently offer VDSL service in selected areas. VDSL provides an incredible amount of bandwidth compared to a maximum speed of 8 to 10 Mbps for ADSL or cable modem and clearly the move from current broadband technology to VDSL could be as significant as the shift from a 56K modem to broadband.
