IBM NeXtScale System Planning And Implementation Manual page 148

Two front-to-rear cable channels on each side of the rack, as shown in
Figure 5-9.
Front to
rear cable
channels
Cable
channels
caps
Front to
rear cable
channels
Cable
channels
caps
Figure 5-9 Front to rear cable channels
Openings in the cable channels on each side of the rack to enable vertical
cabling within the side panels, as indicated by arrows in Figure 5-9.
Openings in the side walls behind the rear posts through which cables can be
routed between racks in a row, as indicated by arrows in Figure 5-5 on
page 126. Also includes are attachment points above and below these
openings to hold cables out of the way and reduce cable clutter. New versions
of this rack have four openings in each side wall.
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IBM NeXtScale System Planning and Implementation Guide
Openings for
vertical cable run
in the side panel
(on both sides)