User's Guide Part 1

Protection of the GPS receiver for PTP-SYNC Chapter 2 Planning considerations
phn-0896_009v003
2-36
UNDER DEVELOPMENT
Feb 2010
Protection of the GPS receiver for PTP-SYNC
If PTP-SYNC is the selected TDD synchronization method, with a GPS receiver as the
timing reference source, then the GPS receiver must be protected as described in this
section.
CAUTION
Ensure that the GPS receiver module is mounted in a position where all
lightning protection requirements can be met.
GPS receiver mounting options
The options for mounting the GPS receiver module are as follows:
• Mount it on the wall of the equipment building, if there is a suitable position from
which it can receive an adequate satellite signal.
• Failing that, mount it on a metal tower or mast.
Mounting the GPS receiver module on the equipment building
If mounting the GPS receiver module on the equipment building (Figure 2-20), select a
position on the wall that meets the following requirements:
• It must have an un-interrupted view of the sky.
• It must receive an adequate signal from at least one GPS satellite.
• It must be in ‘Zone B’ (refer to Lightning protection zones on
page 2-19).
• 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 terminals and finials.
• It must not project more than 600mm (24 inches) from the wall of the building.
• It must be possible to wire it to the PTP-SYNC unit via an LPU with Superior
Essex screened 4-pair cable.
If these requirements cannot all be met, then the module must be mounted on a metal
tower or mast.