• Español
  • Ashburn, VA
    Ashburn, VA

    Let us know the location you'd like to browse.


    Already a Cox Residential customer?

    Looking for Business services? Go to Cox Business home


The Internet should add convenience, not headaches. From step-by-step instructions to helpful tips, we'll help you install your equipment, troubleshoot problems, and get the most out of your online experience – minus the migraine.

Back Print Article


Last Updated: Tue, 08 Sep 2015 > Related Articles

2 rated this


Learn about the available ports and an explanation of the status lights on a RCA DCM315R cable modem.


The RCA DCM315R is a DOCSIS 2.0 cable modem.

Front View

front view

After the cable modem successfully registers on the network, the Cable Link and Internet indicators illuminate continuously to indicate that the cable modem is online and fully operational. For more details, refer to the Modem Lights section.

Back View

back view

The RCA DCM315R has the following ports available on the back of the modem.

  • POWER - Connects the cable modem to the power adapter
  • ETHERNET - Connects to the Ethernet port on your computer
  • USB - Connects to the USB port on your computer
  • RESET - Resets the cable modem
  • CABLE - Connects to the cable wall outlet

The RESET button is for maintenance purposes only. For more details, refer to the Modem Lights section.

Modem Lights

The modem lights indicate the current status of your cable modem. To troubleshoot any connection problems, use the table below.

Ethernet Connection - Modem functioning correctly

Modem Looking for PC

Modem Looking for Cable Connection

By pressing the Internet On/Off button, it puts the modem in stand-by mode. While in stand-by mode, the cable Activity LED is off, and the connection to the internet is lost.

Modem LightStatusProblemSolution
Internet On / Off
Solid GreenNoneN/A
OffNo powerVerify power supply connections and electrical outlet. Also make sure the outlet is not connected to a switch.
PC LinkSolid GreenNoneN/A
FlashingNone - transmitting dataN/A
OffUnable to detect computer connectionVerify Ethernet/USB cable connections, the TCP/IP settings and the NIC. You might need to reinstall the NIC drivers. If this does not resolve the issue, contact Customer Support.
Cable-LinkSolid GreenNoneN/A
Flashing greenLooking for cable connectionVerify all cable connections and try resetting the modem. If connection is OK and modem reset does not correct the problem, contact Customer Support.
offNo cable connection
ActivityBlinkingNone - transmitting or receiving dataN/A
OffNone - no data being transferredN/A

MAC Address Label

mac address

MAC addresses are written as 12 digits containing both letters and numbers (0-9, A-F). A MAC address is unique. The first six characters of the MAC address are unique to the manufacturer of the device.

Rate this Article:

Related Topics:

Give us your feedback:


Maximum 500 characters

Back Print Article

Need More Help?