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Cisco DPC3825

Last Updated: Mon, 16 Nov 2015 > Related Articles

109 rated this


View the available ports and an explanation of the status lights on a Cisco DPC3825 WiFi modem.


The Cisco DPC3825 is a DOCSIS 3.0 device.

Back View 

Back view

The Cisco DPC3825 has the following ports available on the back.

  • POWER - Connects the modem to the power adapter
  • USB - Connects to selected client devices
  • ETHERNET - Four ports connect to the Ethernet port on your computer or home network
  • WIRELESS SETUP - Initiates wireless setup - allows the user to add new Wireless Protected Setup (WPS) compliant wireless clients to the home network
  • RESET - Used to reset the modem

Modem Lights 

Modem lights

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

BlinkingNot connected to the Internet
  1. Turn off all network devices, including the modem and computers. Then turn on each device in the following order.
    1. Modem
    2. Computer
  2. Check the connections. Computers connected by Ethernet must be connected to one of the ports numbered 1 through 4 on the back of the modem.
OffNo powerVerify power supply connections and electrical outlet. Also make sure the outlet is not connected to a switch.
AmberNone - narrowband operationN/A
GreenNone - bonded channel operationN/A
AmberNone - narrowband operationN/A
GreenNone - bonded channel operationN/A
ONLINEOnNone - modem registered on the network and operationalN/A
1 - 4
OnNone - modem successfully connected to a device through that port


BlinkingNone - network activity over that portN/A
OffNo devices are connectedVerify Ethernet cable connections, the TCP/IP settings and the NIC. NIC drivers may need to be reinstalled. If these steps do not resolve the issue, contact Customer Support.
USBOnNone - connection made through the USB portN/A
BlinkingNone - network activity over the USB portN/A
OffNo devices are connectedVerify all cable connections and try resetting the modem. If cable is OK and modem reset does not work, contact Customer Support.
WIRELESS LINKOnNone - wireless access point enabledN/A
BlinkingNone - modem actively sending or receiving data over the networkN/A
OffNone wireless access point disabled by the userN/A
WIRELESS SETUP (WPS)OffNone - wireless setup not activeN/A
BlinkingNone - wireless setup active to add new wireless clients on the wireless networkN/A

Mac Address  

The Cisco DPC3825 comes configured with wireless security. By default, the Cisco WiFi modem supports up to 802.11n wireless standards and uses WPA / WPA2 wireless security settings. The SSID and Passphrase are printed on the label on the modem.

  • The SSID on the modem is either the last 6 characters of the CM MAC Address or the SSID identified on the label.
  • The Passphrase is the same as the 9-digit S/N or serial number of the modem.

MAC label

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