When a customer orders cable Internet service from Comcast, the company provides a Motorola SURFboard cable modem to facilitate high-speed Internet access. This modem comes equipped with Ethernet and USB connectors, a maximum modem transfer rate of 32 Mbps and a network data transfer rate of100 Mbps. Much of the necessary software for the connecting to Comcast's cable service is installed on the device itself; as such, installation consists of simply connecting the modem to your computer and performing some basic configurations.
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Turn on your computer and log in to your operating system as normal. Prepare a location for your cable modem so that you can connect the device to both your cable outlet and your computer. Connect the coaxial cable leading from your cable outlet to the corresponding port on the rear of your modem. Tighten the end of the connector until the cable is securely in place. Plug one end of the power supply into the corresponding port on the rear of the modem; plug the remaining end into any available electrical outlet.
Examine the lights on the front panel of the modem; wait for the "Power," "Send," "Receive" and "Online" lights to turn solid green before you continue.
Connect an end of the Ethernet cable to the corresponding port on the rear of the modem; connect the remaining end to any available Ethernet port on your computer.
Open your operating system's control panel or system preferences window and access the settings for network configuration. Enable the options for automatically obtaining an IP address and DNS server address. These options are usually found in the section for setting TCP/IP preferences. Restart your computer. Installation is now complete.