IBM 0551, Manual

Page: 61 / 182

Note: The front and back of the rack-mounting template has printed illustrations designed to help
you identify the mounting holes to be used when you add units to the rack. Do not use the
rack-mounting template without completing the following steps.
2. Note the following when using the rack-mounting template:
v
Each black or white unit on the template is equal to one Electronic Industries Alliance (EIA) unit.
v An EIA unit is 1.75 in (44.45 mm) in height.
v
The rack contains three mounting holes for each EIA unit of height.
v The EIA units illustrated on the template must be aligned with the EIA units located on the rack.
v
It is not necessary to align like-colored EIA units. For example, a black EIA unit on the
rack-mounting template can be aligned with a white EIA unit located on the rack.
v
The template has two sides. One side identifies the locations for mounting holes at the front of the
rack and the other side identifies mounting hole locations at the rear of the rack. When using the
template, ensure that the appropriate side of the template is facing out.
Figure 45 shows one EIA unit and four EIA units. Depending on the rack manufacturer, the EIA units
might be separated either by color or by a line. Notice that the holes along the rail are not evenly
spaced. If your rack has no color or line separation between EIA units, assume that each EIA unit
begins where the hole spacing
A is closest together.
To use the rack-mounting template, complete the following steps:
a. When facing the front of the rack, remove the protective coating from each adhesive strip that is
located on the back of the rack-mounting template. Lightly press the template into position on the
rack. Ensure that both the left and right sides are at the corresponding EIA locations.
Figure 44. Rack-mounting template
Figure 45. EIA units
Chapter 3. Installing a system or expansion unit into a rack
51