The description below may vary between modem makes and models but the principle remains the same across all makes and models. Please refer to your specific modem’s documentation  for light descriptions and functions specific to your modem:
  • Power light - Indicates the modem is on or off. Some modems have a 2 stage light:
    • Red while the modem is booting up or faulty,
    • Green and stable when the modem in ON and functioning.
  • DSL / ADSL - This light should be on. If this light is flashing or off, the modem is either still booting up or is unable to synchronize with the telkom exchange.
  • Internet light - This light indicated the connection to the internet. This will not be on when the DSL light is off or flashing.
    • This light should be on, Green, when there is no traffic going through the modem and flash when there is data going through.
    • Not on or not flashing, modem unable to connect to the authentication server or modem not configured
    • Light is burning red - usually means the username and password entered incorrect.
  • 1, 2, 3… - These lights indicate that there is a computer connected to the corresponding physical port on the back of the modem.
    • ON - Cable is connected and the device on the other side of the cable is also connected and on.
    • OFF - No cable plugged into this port or the device on the other end of the cable is off or faulty.
A typical wiring diagram for connection up the ADSL modem. Your ADSL modem may differ but the basic principles remain the same.
Possible Problem / Solution
No Power on Modem
  1. Modem power supply connected to modem and power socket.
  2. Modem power supply cable not damaged
  3. Ensure power socket / outlet has power
DSL Light is flashing
  1. Ensure telephone cable is securely connected to the TEL socket on the back of the modem.
  2. Ensure telephone cable is securely connection the Modem / DSL port on the filter
  3. Replace the filter
  4. Ensure all other devices that use the same line goes through a filter
  5. Ensure the line has a dial tone
  6. Ensure the ADSL service on the line is active
Internet Light is RED
  1. Normally means your modem is not authenticating with the servers.
  2. Is your ADSL data account still active with your ISP
  3. Log into your modem and ensure that it is programmed with the correct ADSL username and password. Call the call centre if you have misplaced your credentials.
Internet Light is OFF
  1. Modem is not configured or has lost its configuration
  2. Log into the modem and re configure the settings
Network cable from computer to Modem is disconnected or faulty
  1. Unplug the cable that connects your computer to the modem.
  2. Inspect it for breaks, ensure the connectors on both sides are secure and still have the clip on top.
  3. Plug the cable back into the modem, look which port you are plugging into.
  4. Plug the cable back into the LAN port on your computer.
  5. Ensure the Link light comes on next to the LAN port on the computer.
  6. Ensure the LAN port light corresponding to the port number the cable is plugged into the modem is on.
  7. Replace the LAN cable / LAN card in computer / Modem
All cables and lights are correct
  1. You computer setting may be wrong.
  2. Ping your modem’s IP address to ensure that your computer can communicate with the modem.
  3. Check your computer’s network setting that they are correct for the modem.
  4. Set your computer’s network setting to “Obtain IP address automatically” and “Obtain DNS address automatically”
Have you got available data
  1. Call the call centre to check your data balance.
  2. Top up if necessary.
Internet still not working.
Have your customer code on hand and call the National Call Centre for further assistance.