HP J2962A, Инструкция по установке и справочник

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If you are stacking hubs and the RPS in a single rack and want them to fit
tightly, the selection of the first screw holes is important. In a standard
19-inch telco rack, the screw hole pattern has repetitive pairs of holes
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.
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.
One upright of an EIA
19-inch telco rack
Installation Summary
7