How does vdsl work

Michelle Kwong is an associate publisher for utilities at Finder. She enjoys breaking down tech and telco jargon to help people make more informed decisions. She has a Bachelor of Commerce and Media from the University of New South Wales, and loves reading thrillers and fantasy while drinking pearl milk tea.

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Click here to cancel reply. At this time, I have an extremely poor ADSL connection within the internet connection running at from 2.

If current internet speed is so poor now, which indicates poor quality copper cable over a long distance. This reduced distance should allow for much faster speeds. The reason you cannot be provided with VDSL right now is that VDSL is a short-distance technology and requires another network to cover longer distances.

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How much data do New Zealanders use on average? Why does Chorus recommend unlimited plans? Choosing a new broadband plan? What is ADSL? How do I measure my speed? How do I get the best out of my broadband? What can affect my broadband performance? At the upper extreme of the distance limit, ADSL customers may experience speeds far below the promised maximums, whereas customers close the central office or DSL termination point may experience speeds approaching the maximum, and even beyond the current limit in the future.

You might wonder why, if distance is a limitation for DSL, it's not a limitation for voice telephone calls, too. The answer lies in small amplifiers, called loading coils, that the telephone company uses to boost voice signals. These loading coils are incompatible with DSL signals because the amplifier disrupts the integrity of the data. This means that if there is a voice coil in the loop between your telephone and the telephone company's central office, you cannot receive DSL service.

Several other factors might disqualify you from receiving ADSL:. In the next section, you'll find out why. VDSL can achieve incredible speeds, as high as 52 Mbps downstream to your home and 16 Mbps upstream from your home.

But VDSL's amazing performance comes at a price: It can only operate over the copper line for a short distance, about 4, feet 1, m. The key to VDSL is that the telephone companies are replacing many of their main feeds with fiber-optic cable. In fact, many phone companies are planning Fiber to the Curb FTTC , which means that they will replace all existing copper lines right up to the point where your phone line branches off at your house.

Instead of installing fiber-optic cable along each street, FTTN has fiber going to the main junction box for a particular neighborhood. The gateway takes care of the analog-digital-analog conversion problem that disables ADSL over fiber-optic lines. It converts the data received from the transceiver into pulses of light that can be transmitted over the fiber-optic system to the central office, where the data is routed to the appropriate network to reach its final destination.

When data is sent back to your computer, the VDSL gateway converts the signal from the fiber-optic cable and sends it to the transceiver. All of this happens millions of times each second! On the next page, you'll find a chart that lists the variations and how they compare to each other.

There are several variations on DSL technology. In fact, there are so many that you will often see the term xDSL , where x is a variable, when the discussion is about DSL in general. As you can see, VDSL provides a significant performance boost over any other version. But for VDSL to become widely available, it must be standardized. DMT divides signals into separate channels, each 4 kilohertz KHz, or 1, cycles per second wide.

One way to think about it is to imagine that the phone company divides your copper line into different 4-KHz lines and attaches a modem to each one. You get the equivalent of modems connected to your computer at once!