Electronic equipment
subsystems deals with the enclosure and all internal structures
and hardware used to package an electrical or electronic
circuit. The enclosure and all of the internal substructures form
an integral part of each piece of electronic hardware. Besides
providing a mounting medium for all of the electrical and electronic
circuitry it, in many instances, plays a major role in the
functionality of hardware. It provides the capability for the electronics
to be exposed to and survive the environments to which
the hardware may be exposed during its operating life. The reliability
and maintainability of a piece of electronic hardware along
with its physical appearance will be determined by the design of
the enclosure.