Edimax Technology Wireless 3G Portable Router 3G-6210n - Manual (Page 22)

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4. Please check all LEDs on the front side. ‘PWR/CHR’ LED should be
steadily on in green color, and ‘ETHERNET’ LED should be on if the
computer / network device connected to the Ethernet port of the router
is powered on and correctly connected.
5. If PWD LED is not on, or any LED you expected is not on, please
recheck the cabling, or jump to ‘4-2 Troubleshooting’ for possible
reasons and solution.