ADSL Guide

Get all your answers for your ADSL questions today

Got questions about ADSL?

Our ADSL Guide answers the most frequently asked ones.



  • What is ADSL?

    ADSL is a fast, "always available" connection to the internet. It comes at various speeds, starting at seven times faster than a Dial-Up connection to over 180 times faster!

    Unlike Dial-Up, with ADSL you are not billed for the time spent online, instead you pay a monthly rental for the ADSL line and are then charged for the amount of data transferred using your ADSL connection, regardless of how long you spend on the internet.

    There are different types of data packages available as well as several ADSL speed options ‐ find out more below.

  • What is VDSL?

    VDSL is a the next generation of ADSL. It is an even faster, "always available" connection to the internet. It currently comes in speeds of either 20Mbps or 40Mbps.

    In order to use VDSL your Telkom exchange has to support it, Telkom are in the process of upgrading all exchanges however at present only a few currently provide VDSL.

    VDSL also requires a modem/router that is VDSL compliant, be sure to check your modem/router's manual to ensure it can support VDSL before signing up.

  • What do I need to get ADSL/VDSL (xDSL)?

    1. An existing Telkom voice line (Prepaid, ISDN, Junction and Digital lines are not xDSL compatible).
    2. xDSL must be enabled on your line; you'll be charged a monthly rental fee based on your chosen speed.
    3. After your xDSL has been enabled, you'll need to buy an xDSL modem or router (available at any PC retailer).
    4. For VDSL you need to ensure that the modem/router supports VDSL, so ask the retailer to check before you buy.
    5. You need to carry on paying Telkom for your voice line rental and voice calls made on it.
    6. You will need xDSL data: we offer prepaid, monthly capped and uncapped (no limit) internet data packages.
  • What is the difference between a Modem and a Router?

    xDSL Modem

    Typically, a standard xDSL modem can connect to only one computer at a time unless other hardware is added to "share" the modem over several computers. (This hardware is called a network hub.)

    Unlike Dial-Up modems, most xDSL modems have a built in memory to store your ADSL login credentials and will manage your internet connection on its own, it will even remain connected to the internet when your computer is turned off.

    For a do-it-all xDSL modem, Nexus ISP recommends the Netgear DM111P.

    xDSL Router

    An xDSL router acts in the same way as an xDSL modem but with built-in "sharing" capacity. This device allows you to share your internet connection with different computers at home or in the office by using network cables to connect to the router.

    Some ADSL routers include Wireless (Wi-Fi) facilities so that wireless devices such as laptops and PDAs can also share the internet connection.

    Nexus ISP recommends Netgear routers which also include features such as firewalling and parental control.

  • What is the difference between Prepaid, Monthly Capped & Uncapped Data?

    Prepaid Data

    Prepaid data works like 'Pay-As-You-Go' airtime for your cell phone: you buy data as and when you need it and whatever you don't use is carried over each month. Prepaid data is great for internet users who don't consume large amounts of data in a month.

    Monthly Capped Data

    Monthly Capped data provides you with a fixed amount of data every month; the cap is reset on the first of each month. If you run out of data before the end of the month, you can top up at any time but it will be at an extra cost.

    Uncapped Data

    Uncapped allows you to use as much data as you like for a single monthly fee instead of buying data per GB or having a capped amount.

    But since there is no limit to data and you do not pay for each GB used, these accounts are subject to a "fair usage policy". Uncapped accounts are slowed down or limited by different shaping rules whenever usage exceeds the average use on the net. It's simply to prevent heavy users making the network unusable for others.

    Think of uncapped data as an all-you-can-eat buffet: you can eat as much as you like for one price but the quality isn't always as good as the á la carte menu!