be routed back to the rear of the chassis. If there is rear IO, the
proper spacing of the side walls and subrack distance needs to
be calculated to account for plugging of both the front and rear
Chassis in horizontal-mount configurations can also be recessed.
For Eurocard-based architectures like CompactPCI, VME/64x,
and VPX, it usually consists of a 6U board mounted horizontally
next to the front-pluggable PSU. This allows full swappability
of the system and minimal downtime. Naturally, many of these
applications are also looking for recessed solutions.
Many embedded systems have rear IO options,
where the chassis complies with IEEE 1101.11
mechanical mounting specifications. As the
concept is basically the same for an extruded
modular chassis in the rear as the front, the
rear of the chassis can also be recessed. It is also
possible to have some modules recessed within
the card cage and others flush with the rear (or
As more recessed chassis configurations become available, less modifications are required in the future.
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front) of the chassis. You just need to provide
the proper mounting provisions.
There are many advantages to utilizing a
recessed enclosure. This includes EMC, safety/
security, cabling, and mechanical protection.
One barrier in the past was the concern that
too much customization would be required.
However, with a modular construction the
changes can be implemented with less modifications. As more recessed chassis configurations become available, less modifications are
required in the future. Who knows, perhaps
we’ll see recessed enclosures become much more
common for embedded systems.