Flatten the packing carton and store it. You will need the packing materials if you need to move or ship the switch in the future. Leave enough clearance to allow yourself to move around the chassis. Use the tape measure to measure the depth of the rack. Measure from the outside of the front mounting posts to the outside of the rear mounting strip.
Some equipment racks have 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. The L brackets connect the switch chassis to the rack. You can mount the L brackets to the front or rear mounting holes of the chassis, depending on which end is in the front of the rack. G switch is shown in the rack-mounting illustrations.