Chapter 3: System planning
Site planning
Page 3-16
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It must have an un-interrupted view of at least half of the sky. For a receiver mounted on a
wall there must be no other significant obstructions in the view of the sky.
•
It must be mounted at least 1 m (3 ft), preferably 2 m (6 ft), away from other GPS receiving
equipment.
•
It must not be sited in the field of radiation of co-located radio communications equipment
and should be positioned at a distance of at least 3 m (10 ft) away.
Mount the GPS receiver on the wall of the equipment building, if there is a suitable location on
the wall that can meet these requirements. Failing that, mount it on a metal tower or mast.
Caution
The GPS receiver is not approved for operation in locations where gas hazards exist,
as defined by HAZLOC (USA) and ATEX (Europe).
Mounting the GPS receiver module on the equipment building
If mounting the GPS receiver for PTP-SYNC on the equipment building (
), select a
position on the wall that meets the following requirements:
•
It must be below the roof height of the equipment building or below the height of any roof-
mounted equipment (such as air conditioning plant).
•
It must be below the lightning air terminals.
•
It must not project more than 600mm (24 inches) from the wall of the building.
If these requirements cannot all be met, then the module must be mounted on a metal tower or
mast.
Mounting the GPS receiver module on a metal tower or mast
If mounting the GPS receiver module on a metal tower or mast (
), select a position
that meets the following requirements:
•
It must not be mounted any higher than is necessary to receive an adequate signal from
four GPS satellites.
•
It must be protected by a nearby lightning air terminal that projects farther out from the
tower than the GPS receiver module.
NIDU location
Find a location for the NIDU that meets the following requirements:
•
The NIDU can be mounted in a cabinet rack or on a flat surface.
•
The NIDU is kept dry, with no possibility of condensation, flooding or rising damp.
•
The NIDU is located in an environment where it is not likely to exceed its operational
temperature rating, allowing for natural convection cooling.
•
The NIDU can be connected to the PSU, LAN network terminating equipment and TDM
transceivers.
•
The NIDU can be connected to a compatible DC power supply.
