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Powering Up and Checking LEDs
16 Megabit Modem 410F and 420F User Manual
Powering Up and Checking LEDs
Once you have completed the steps described in the previous sections for the Megabit Modem
410F and 420F, you are ready to power up each modem.
1 Plug the Megabit Modem 410F and 420F power supplies into the facility power and ensure
the Power LED is lit solid green.
2 Allow the modems approximately 30 to 60 seconds to synchronize.
3 After both modems are powered up, verify the following LED indications on each modem:
• LAN LINK LED is solid green (when the Ethernet port is connected)
• ADSL SYNC LED is solid green when the Megabit Modem 410F synchronizes with
the Megabit Modem 420F (the LED flashes green when synchronization is lost
between the two modems)
• ADSL MAR LED is solid green if the margin is at or above the configured Margin
Threshold (see page 53 )
If conditions other than those listed above exist, check the cabling. See “Installing Cabling” on
page 14 for instructions.
The illustration and table on page 17 describe LED indications for all operational modes.
LEDs on the modem front panel provide continual status at-a-glance for network and
modem connections.