What is VDSL?

A very high bit rate Digital Line Subscriber (VDSL) is next generation DSL at highly accelerated rates. The architecture is based one of two technologies: QAM (Quadrature amplitude modulation) or DMT (Discrete multitone modulation). DMT is more commonly used in South Africa.

VDSL is very hardy and it is capable of providing services like HDTV and video on demand along with internet access. It can 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 so this makes it a very exciting product. With the growth in demand, the price of packages will in likelihood drop and become more affordable.

This technology is able to deliver exceptional bandwidth over standard ADSL and telephone lines .

VDSL, based on discrete multi-tone modulation (DMT), creates 247 virtual channels within the available bandwidth. Each channel's integrity is monitored and data is switched to an alternate channel when signals become degraded. In this way, data is constantly shifted to the best route for transmitting or receiving data, making DMT a a tough new technology.

As with other broadband technologies, end user speeds will depend upon the distance of the feed or loop to the local telephone company. Shorter distances afford faster rates, while longer loops degrade signal and speed. One drawback of this technology is that it requires a very short loop of about 4,000 feet (1,219 meters), or three quarters of a mile. Another complication can inadvertently create a solution for the distance problem: the complication of fiber optic lines.

Telecommunication companies are installing fiber optic lines in place of copper or normal lines. If a stretch of line between the customer and Telkom is fitted with fiber optic, VDSL signals get "lost in translation" converting from analog (copper), to fiber optic (digital), and back to analog. A VDSL gateway device installed at the junction box will translate the signals to pulses of light able to traverse the fiber optic cable. Through this process, the distance barrier associated with copper wire and VDSL is "bridged" or bypassed. When Telkom receives the light impulses, it sends data back to the junction box gateway, which converts the signal to forward along the copper wires a short distance to the modem or router. In this case distance would not be a problem.

Some areas in South Africa are already rolled out for VDSL. You can check with your Telkom office in your area if you qualify for this new technology !  

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