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Linksys BEFCMU10v3


Modem Information

Cable Modem

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

Not compatible with future speed increases

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

image of front view

Click to enlarge.

After the cable modem successfully registers on the network, the Power, Cable, and USB or Ethernet indicators illuminate continuously to indicate that the cable modem is online and fully operational.

Back View

image of back view

Click to enlarge.

The Linksys BEFCMU10v3 has the following ports available on the back of the modem.

  • POWER - Connects the cable modem to the power adapter
  • RST - Used to reset the modem
  • LAN - Connects to the Ethernet port on your computer
  • USB - Connects to the USB port on your computer
  • CABLE - Connects to the cable wall outlet

The RST button is for maintenance purposes only.

MAC Address

image of MAC address label

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.

Modem LightStatusProblem


Solid Green


OffNo power. Verify power supply connections and electrical outlet. Also make sure the outlet is not connected to a switch.
Flashing green
Searching for cable connection. Verify all cable connections and try resetting the modem.
Fast Flash ModemSearching for cable connection. If this is a new modem or a replacement modem, you must contact Cox with your MAC address Click Here. If there are several MAC addresses on the modem, please use the “HFC” or “RF” MAC address.
OffNo connection cable connection. Verify all cable connections and try resetting the modem.

Flashing Green

Traffic is passing through the cable modem port.
EthernetSolid GreenNone. Ethernet connection to computer found.
OffNo Ethernet found. Verify Ethernet cable connections, the TCP/IP settings and the NIC. You might need to reinstall the NIC drivers.
USBSolid GreenNone. USB connection to computer found.
OffNo USB found. Verify USB cable connections, the TCP/IP settings and the USB cable. You might need to reinstall the USB drivers.

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