MIL-PRF-85725A(AS)
c. Provide module retainer mechanisms to secure the modules firmly in place and provide for
thermal contact with the guide rail.
d. Be removable as an assembly, complete with module guide rail and heat exchangers, from
the front of the rack.
e. Provide a means to allow the escape of water or other fluids from the module equipment.
3.3.2 Backplanes. All electrical connections between modules, tiers, and input/output (I/O)
connectors shall be through backplanes.
3.3.2.1 Primary backplane. The primary backplane shall provide the electrical and mechanical
interconnection for the modules (see figure 1).
3.3.2.2 Secondary backplane. The secondary backplane shall provide an interconnection
medium for rack I/O connectors, primary backplanes, and other associated electrical components.
3.3.3 Connectors. Electrical connections shall consist of the connector types specified in
3.3.3.1 and 3.3.3.2.
3.3.3.1 Input/output connectors. The rack shall accommodate connectors as specified in
MIL-C-38999. Locations shall be provided at the ends which are not plenums of the rack for I/O
connector mounting. The I/O connectors and secondary backplane shall be removable from the
inside of the enclosure.
3.3.3.2 Secondary/primary backplane. An interface connector shall be provided between the
primary backplane and secondary backplane for the purpose of simplifying the removal of an
entire tier.
3.3.4 Mounting and support. Vibration isolators shall be the primary means of support with
the exception of hard mounting applications when specified in the contract (see 6.2). Resonant
frequencies of the rack or any of its components excluding the external isolators shall be not less
than 45 Hertz (Hz).
3.3.5 Air inlet and outlet. The rack shall accommodate forced-air cooling. Cooling air shall
not enter the module compartments or the compartment containing the primary or secondary
backplane. The cooling air shall enter a plenum on one side of the rack, pass through the heat
exchangers into the opposite side plenum, and then exhaust out of the rack. Location of the air
inlet and exhaust outlet shall be optional, unless otherwise specified in the contract (see 6.2).
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