Web-ster Support

DSL Broadband

Cisco 678

Is the modem functional?

  • Check to see if the modem is functional. If there is a red light shining through the vent on the top of the modem, or if the alarm light is on, the modem may need to be replaced. Contact Web-ster Technical Support.

No power light

  1. If the power light does not show green, check all plugs to make sure they are securely connected. If you are using a surge protector, make sure the surge protector is turned on.
  2. If you are using a surge protector that has a breaker overload button, reset the surge protector by pressing the button.

No WAN link light

  • If the WAN link light does not turn on, check all plugs and cables to make sure they are securely plugged into the correct ports. To review how the hardware connects, see the diagram below.



  • The modem operates best when located within 12 feet of the outlet. If the phone cable connecting your modem is more than 12 ft. long, install a shorter cable.
  • If you do not have a POTS splitter, make sure all phone jacks on the premises with devices connected to them (telephones, fax machines, etc.) are filtered. Phones that are not filtered must be unplugged.

No LAN link light

  1. If the LAN link light does not come on, check all plugs and cables to make sure they are correctly installed and securely connected. Verify that you are using the supplied Ethernet cable, and that the NIC was installed on your computer according to the manufacturer’s instructions.

Troubleshooting the connections

  • While troubleshooting the connections, refer to the diagram below.



  1. Plug the electrical adapter from the wall outlet (or surge protector) into the modem.
  2. Plug the Ethernet crossover cable into the ENET port, and plug the other end into your computer.
  3. Plug one end of the phone cord into the WALL port, and plug the other end directly into a phone line microfilter (or phone jack if you have a POTS splitter). If you have a phone line microfilter with a DSL side and a Phone side, make sure the cords are plugged into the correct sides.