Cable Modem Troubleshooting: 3COM CMX2940

Light patterns, images, manuals and more helpful info for the 3COM CMX2940 cable modem –

Manufacturer: 3Com Model: CMX2940
Modem Light Indicators
Modem Power

Solid green when power is applied to modem.

Modem Status

Short off, Long orange flashing – Startup, power on self test.
Solid orange – Failed power on self test.
Short off, short orange flashing – searching for downstream signal.
Long orange, short green flashing – Acquisition in progress.
Short off, short green flashing – modem not authorized.
Solid green – modem is acquired.

PC Status Modem is connected to a functional ethernet card.
PC Activity

Flashing orange – Indicates transmission of data to/from ethernet.

Cable Activity Flashing orange – Indicates transmission of data to/from cable


LED function is determined by cable provider.

Notes and Useful Information:

Installation and User Manual

Manufacturer Product Website

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