Technical Manual

Chapter 5 • Maintenance
D C U M a i n t e n a n c e a n d O p e r a t i o n M a n u a l 33
Antenna Clearance
New construction may cause objects to be installed near the antenna. The antenna
must be mounted clear of metal objects in the horizontal plane for a distance of one
antenna length. Any metal in the radiation area will result in a corresponding RF
shadow on the map.
The headend may be used to issue trace route commands to endpoints which are
likely to be affected. The antenna may have to be repositioned to provide a better
line of sight to the affected units.
Label Inspection
Check to see if any required labels are damaged or missing. Replace any missing
labels.
• The DCU should have a label affixed to the door which identifies the (utility)
owner, the utility's phone number, and possibly other information.
• An AC powered DCU has a label on the front which identifies the location of
its disconnect switch.
• A rooftop DCU has a label affixed to the assembly's official grounding point
at the base of the mast.
• A water tower mounted DCU, or short mast rooftop DCU should have (if
appropriate) an FCC warning label near the antenna if it has been determined
that workers might spend time very close to the antenna.
General Observations
• Check cables and wires, and ensure that they are not cracked or damaged.
• Check the external connectors to ensure they remain waterproofed and free
of corrosion.
• Check the internal connectors to ensure they remain properly seated and free
of damage.
• Check the RF antennas, and ensure that they are not damaged or loose.
• Check the solar panel to ensure it is undamaged and free of dirt and
obstructions.
• When working inside the DCU, be on the lookout for dirt and damage to
electronic components, discoloration, cracking, or chipping. Components
that appear to show wear may require further tests and investigation to
ensure they are functioning properly.