HP J2415A Installation And Reference Manual page 24

Installing the HP AdvanceStack Hub
I m p o r t a n t
Steps 2 through 4 below apply to mounting a single hub or the first of
N o t e
multiple hubs that will be stacked in a rack. The mounting brackets are
designed to make it easy to install this first hub—if it is installed correctly,
the installation of subsequent hubs is simplified. To make the process
easy, it is important to get the first hub located correctly. This is
done by selecting the correct holes in the rack's uprights.
This first hub (or single hub) should be mounted in a position toward the
bottom of the rack for stability and to make it easier to stack the other hubs
on top.
2. As shown below, partially install a screw (5/8-inch number 12-24) in each
Insert a screw into the top hole
of a close (0.5-inch) pair—like
one of these—one in each of
the rack uprights.
1-10
rack upright. Ensure that the screws in each upright are at the same
level.
If you are stacking multiple hubs in a single rack and want them to fit
tightly, the selection of the first screw holes is important. In an
EIA-standard 19-inch telco rack, the screw hole pattern is
repetitive—pairs of holes are separated by 0.5-inch or 0.625-inch. Insert
these first screws in the upper hole of a close (0.5-inch) pair, as shown in
the illustration.
One upright of an EIA
19-inch telco rack