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RCA DCM315R 30Mbps Cable Modem manual

RCA DCM315R 30Mbps Cable Modem manual Image

RCA DCM315R 30Mbps Cable Modem

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?

Highest Service Level


Front View

front view

Click to enlarge.

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

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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

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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 Light Status Problem
Internet On / Off
Solid Green None.
Off No power. Verify power supply connections and electrical outlet. Also make sure the outlet is not connected to a switch.
PC Link Solid Green None.
Flashing None. Transmitting data.
Off Unable 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-Link Solid Green None.
Flashing green Looking for cable connection. Verify all cable connections and try resetting the modem.
Off No cable connection.
Activity Blinking None. Transmitting or receiving data.
Off None. No data being transferred.
Message Off None.

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