Chapter 2: System hardware
Installing a GPS receiver
Page
2-64
Installing a GPS receiver
To install a GPS receiver as the timing reference source, use the following procedures:
•
•
•
Installing and connecting the GPS LPU
on page
Caution
Prior to power-up of equipment, ensure that all cables are connected to the correct
interfaces of the CMM4 unit and the UGPS receiver module. Failure to do so may result in
damage to the equipment.
GPS receiver location
Mount the GPS receiver at a location that meets the following requirements:
•
It must be possible to protect the installation as described in
Grounding and lightning protection
•
It must have an un-interrupted view of at least half of the southern (resp. northern) sky in the
northern (resp. southern) hemisphere. 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 UGPS receiver on the wall of the equipment building if there is a suitable location on the wall
that can meet these requirements.
Mounting the GPS receiver module on the equipment building
If mounting the GPS receiver 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:
Содержание PMP 450 AP
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