Emerson ATCA-F120 Installation And Use Manual page 48

Hardware Preparation and Installation
5. Fully insert the blade and lock it to the shelf by squeezing the lever and the latch
together and turning the handles towards the face plate.
If your shelf is powered, as soon as the blade is connected to the backplane power
pins, the blue LED is illuminated.
When the blade is completely installed, the blue LED starts to blink. This indicates
that the blade announces its presence to the shelf management controller.
If an RTM is connected to the front blade, make sure that the handles of both the RTM and the
front blade are closed in order to power up the blade`s payload.
6. Wait until the blue LED is switched off, then tighten the face plate screws which
secure the blade to the shelf.
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ATCA-F120 Installation and Use (6806800D06F)