HP AdvanceStack 10Base-T Hub-12 Installation And Reference Manual page 21

I m p o r t a n t
Steps 2 through 4 below apply to mounting a single hub or the
N o t e
first of multiple hubs in a rack. The mounting brackets are
designed to make it easy to install this first hub, and once it is
installed correctly, to easily install subsequent hubs by placing
them on top, one at a time, and then securing them to the rack.
To make the process easy, it is important to get the first hub
located correctly.
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 put the other hubs on top.
2. As shown below, partially install a screw (5/8-inch number 12-24) in
each 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" 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 repeats with vertical pairs of the holes being close together.
Insert these first screws in the upper hole of one of these close pairs,
as shown in the illustration.
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.
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Installing the HP AdvanceStack 10Base-T Hubs
One upright of an EIA
19-inch telco rack
1-7