Measure from the outside of the front mounting posts to the outside of the rear mounting strip. Remove the screws from either the front or rear of the switch side cover panels, depending on which end of the chassis will be at the front of the rack. If necessary, you can also install the L brackets on the rear edge of the switch chassis. The cable guide attaches to the L bracket. Attach the cable guide to the right side of the switch to prevent the cables from obscuring module LEDs.
Some equipment racks provide a power strip along the length of one of the rear posts.
If the rack has this feature, consider the position of the strip when planning fastener points. Before installing the L brackets on the chassis, determine whether to install the chassis from the front or the rear of the rack. Position the chassis in the rack as follows. If the chassis front panel is in the front of the rack, insert the rear of the chassis between the mounting posts. If the rear of the chassis is in the front of the rack, insert the front of the chassis between the mounting posts.