CAT 5, or Category 5, network cable is designed for ease of installation and is capable of delivering network data speeds of up to 100 Mbps. Connecting a DSL modem to a router/firewall or a computer requires a CAT 5 cable equipped with RJ45 eight-pin connectors on each side. Wire a DSL modem to a computer or router/firewall to complete a new DSL modem installation.
Plug one end of a CAT 5 straight-through patch cable into the eight-pin LAN port on the DSL modem. Push the connector into the port until you hear a "click."
Plug the other end of the CAT5 straight-through patch cable into the WAN/Internet port on a router/firewall or the eight-pin network port on a computer. Push the connector into the port until you hear a "click.'
Power up the computer or power up the router connected to the DSL modem. Plug the power adaptor for the DSL modem into a wall socket to power up the modem.
Watch the green and amber lights on the DSL LAN port and the WAN/Internet port on the router or on the network port of the computer and verify that the lights are blinking on both sides, indicating that communication is established.