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Modem Information

Cable Modem

DOCSIS 2.0 with speeds of up to 25 Mbps on a wired connection.

Cox recommends a DOCSIS 3.1 modem or gateway

What does this mean?DOCSIS 2.0 has a maximum speed of 25 Mbps on the Cox network.

Highest Service Level


Front View

front view

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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.

Back View

back view

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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.

MAC Address

mac address

Click to enlarge.

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.


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

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 LightStatusProblem
Internet On / Off
Solid GreenNone.
OffNo power. Verify power supply connections and electrical outlet. Also make sure the outlet is not connected to a switch.
PC LinkSolid GreenNone.
FlashingNone. Transmitting data.
OffUnable to detect computer connection. Verify Ethernet/USB cable connections, the TCP/IP settings and the NIC. You might need to reinstall the NIC drivers.
Cable-LinkSolid GreenNone.
Flashing greenLooking for cable connection. Verify all cable connections and try resetting the modem.
OffNo cable connection.
ActivityBlinkingNone. Transmitting or receiving data.
OffNone. No data being transferred.

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