User's Guide Part 1

Table Of Contents
Chapter 3: System planning Site planning
Mounting the GPS receiver module on the equipment building
If mounting the GPS receiver for PTP-SYNC on the equipment building (Figure 43), 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 (Figure 44), 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.
Drop cable grounding points
To estimate how many grounding kits are required for each drop cable, refer to the site
installation diagrams (Figure 36 , Figure 37 and Figure 38) and use the following criteria:
The drop cable shield must be grounded near the ODU at the first point of contact between
the drop cable and the mast, tower or building.
The drop cable shield must be grounded at the building entry point.
For mast or tower installations (Figure 36), use the following additional criteria:
The drop cable shield must be grounded
at the bottom of the tower, near the vertical to
horizontal transition point. This ground cable must
be bonded to the tower or tower ground
bus bar (TGB), if installed.
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