Instruction manual

ACU-1000 Operations Manual
Interoperability Now 2-3
2.5 Installation Considerations
Careful attention to the following installation suggestions should result in the best unit/system
performance. Figure 2-1 provides overall unit dimensions.
The ACU-1000 must be installed in a structure, which provides both protection from the
weather and assurance of ambient temperatures between -20 and +60 degrees C. Since the unit
is neither splash proof, nor corrosion resistant, it must be protected from exposure to salt spray.
When the unit is mounted in a cabinet with other heat-generating equipment, the use of a rack
blower is suggested to keep the cabinet interior temperature rise to a minimum.
2.5.1 Mounting
For applications such as mobile command centers or transportable cases or any other
application where some degree of shock and vibration is expected, the ACU-1000 must be
mounted with rear support brackets in addition to the front mounting screws. The rear support
brackets must not block airflow to the unit.
For fixed applications such as floor mounted cabinets or racks in a fixed equipment room, rear
supports are recommended, but not required. Screws are provided in the accessory kit for
securing the unit to a rack via the front panel.
2.5.2 Cooling
The ACU-1000 depends on natural convection for its cooling, therefore it must be mounted in a
way that allows for sufficient air circulation or unacceptably high internal temperatures may
result. There must be at least one inch of air space above and below the ACU-1000 to allow air
to flow through the perforated metal top and bottom covers. It may not be set on a flat surface
without provisions made for air to flow through the unit.
A fully loaded ACU-1000 (with twelve modules installed) dissipates approximately 100 watts.
Consider other heat sources installed along with the ACU-1000 in a 19" rack or other type of
cabinet. Do not install other heat generating devices below the ACU-1000. Use forced air-
cooling in the cabinet if necessary.
NOTE: When the ACU-1000 is installed in a high RF environment
such as repeater site, it is recommended cable assemblies to each
module should be individually shielded. The cable shields should be
connected to the connector shells so they make contact with the
grounded D-subminiature connector shells or Pin1 of P1-P13 on the
backplane board, and not grounded at the opposite end of the cable.