Cisco Gigabit Switch Router 12008 Installation And Configuration Manual page 184

Starting the Cisco 12008
Step 3
This completes the initial installation procedures for the Cisco 12008. You can now proceed
with the basic router configuration tasks, as presented in Chapter 4, "Observing System
Startup and Performing a Basic Configuration."
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Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
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For the DC-input power supply(ies), the green INPUT OK LED should go
on.
Listen for the fans in the card cage fan tray and the power supply fan tray to
power up. You should hear the fans come up to normal rotational speed in about
2 seconds.
In a noisy environment, you can check fan operation by placing your hand in
front of the air filter assembly and the power supply fan tray to determine if air
is being drawn into the interior of the router. Alternatively, you can place your
hand at the top rear of the router to determine if air is being exhausted from the
vents in the rear panel of the router enclosure.