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Arris CM820 Cable Modem Status Lights

This article will explain the meaning of the status lights found on the Arris CM820 Cable Modem, the default modem supplied for iiNet Cable services.

nbn™ HFC customers who signed up before 1 March 2017 may also have this model as an nbn™ Connection Box. If you signed up after this date, see Arris CM8200 for nbn™ HFC Status Lights instead.

These lights may help you quickly check on the status of your connection which may be useful when troubleshooting.

 

Status lights

Light State Meaning
Power Off No AC power supply. Please note that all other lights will be off if the modem has no power.
Green Working AC power supply.
DS Off There is no power or internet is not available. Troubleshoot no connection.
Green Indicates ultra-high-speed downstream/download activity. We typically expect a green DS and US light for Cable connections.
Yellow Indicates high-speed downstream/download activity. Check your usage in Toolbox - if your Cable service is shaped, consider purchasing a Data Pack. If your service is not shaped, please call us on 13 22 58 for assistance.
Flashing If it remains flashing after the modem has finished booting up, check the coaxial cable connection. If the coaxial cable seems fine, please call us on 13 22 58 for assistance.
US Off There is no power or internet is not available. Troubleshoot no connection.
Green Indicates ultra-high-speed upstream/upload activity. We typically expect a green DS and US light for Cable connections.
Yellow Indicates high-speed upstream/upload activity. Check your usage in Toolbox - if your Cable service is shaped, consider purchasing a Data Pack. If your service is not shaped, please call us on 13 22 58 for assistance.
Flashing May indicate a signal issue if it remains flashing after the modem has finished booting up and the DS light is solid. Please call us on 13 22 58 for assistance.
Online Off There is no power or internet is not available.
Green Internet is available.
Flashing May indicate a provisioning issue. Please write down your Cable modem's Serial Number and CMAC number as printed on the sticker on the base of the modem (example) and call us on 13 22 58 for assistance.
Link Off There is no power or no working connection to the yellow Ethernet port on the back of the modem. If something is plugged in, try a different Ethernet cable.
Green Working 1000Mbps connection to the yellow Ethernet port on the back of the modem - typically indicates the recommended Cat6 or Cat5e Ethernet cable is being used.
Yellow
Working 10/100Mbps connection to the yellow Ethernet port on the back of the modem - typically indicates an older Cat5 Ethernet cable is being used. We recommend Cat6 or Cat5e Ethernet cables for Cable broadband.
Flashing Activity on the device connected via Ethernet.

When sitting flat, the lights read from left to right - LINK, ONLINE, U.S, D.S, POWER

 

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