F5 BIG-IP 3900, Manual

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5. Attach the front mounting brackets to the outer rails, and then slide the front mounting brackets up to the rail locks.
Note: The front brackets are shorter than the rear brackets.
6. Secure the front mounting brackets to the outer rails by attaching and hand-tightening the included Keps (or wing)
nuts.
7. Attach the rear mounting brackets to the outer rails.
8. Secure the rear mounting brackets to the outer rails by attaching and hand-tightening the included Keps (or wing)
nuts.
9. Remove the outer rails and attached mounting brackets from the unit.
10. Hold the rails and brackets up to the rack, place the front bracket either in front of or behind the cabinet rail (as
appropriate for the rack type), and secure it to the rack using at least two thumb screws.
11. Adjust the rear bracket until it fits either in front of or behind the cabinet rail (as appropriate for the rack type), and
secure it to the rack using at least two thumb screws.
Installing the unit into a rail-mount rack
Once the outer rails are installed into the rack, you can slide the inner rails mounted on the unit into the rack.
1. Extend the outer rails to the fully-locked position.
2. Slide the ball retainer on each rail to the front of the rail.
Platform Guide: 3900 | 21
Platform Installation