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Cisco DPC3825

Last Updated: Mon, 26 Jan 2015 > Related Articles

96 rated this


Learn about the available ports and an explanation of the status lights on a Cisco DPC3825 Home Gateway.


The Cisco DPC3825 is a DOCSIS 3.0 cable gateway.

Back View 

The Cisco DPC3825 has the following ports available on the back of the gateway:

  • POWER - Connects the gateway 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 gateway

Modem Lights 

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

Router LightStatusProblemSolution
BlinkingNot connected to the InternetTurn off all network devices, including the gateway and computers. Then turn on each device in the following order:
  1. Gateway
  2. Computer
Check the cable connections. The computer should be connected to one of the ports numbered 1-4 on the gateway.
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 - gateway registered on the network and operationalN/A
1 - 4
OnNone - gateway 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 - gateway actively sending or receiving data over the networkN/A
OffNone wireless access point disabled by the userN/A
WIRELESS SETUPOffNone - 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 home networking gateway 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 gateway.

  • The SSID on the gateway 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 serial number of the Cisco home networking gateway.

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