IBM 0551, Manual

Page: 106 / 182

1. Using the rack-mounting template, determine where in the rack to place the system unit. Install units
in the lower part of the rack first. Place larger and heavier units in the lower part of the rack.
Note: The front of the rack-mounting template has printed illustrations designed to help you identify
the EIA location 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 is two-sided. When using the template, ensure that the appropriate side of the
template is facing out.
Figure 98 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, follow these steps:
a. Remove the protective coating from each adhesive strip 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 97. Example of a rack-mounting template
Figure 98. EIA units example
96
Installing into a rack