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30 TimeSource 3100
Engineering and Ordering
097-72020-01 Issue 9: November 2003
Site Survey
Perform a site survey as described in Procedure A before ordering the system. Use the
guidelines and considerations in the Antenna Location Guidelines section and the Shelf
Considerations section.
Procedure A. Site Survey
End of Procedure
Step Action
1 Determine the shelf location.
2 Determine the best location for mounting the antenna (less than 305 m of
cable from the shelf). Use the guidelines and considerations in the Antenna
Location Guidelines section.
3 Determine the location of the grounding point for the lightning suppressor,
then determine the location of the lightning suppressor. The cable length
between the lightning suppressor and the grounding point must be less than
4.6 m. If the grounding point is inside the building, the cable length between
the grounding point and the cable entry must be less than 15 m. Valid
lightning suppressor grounding points are as follows:
• Valid roof ring ground system (usually for roof-mounted lightning
suppressors)
• Structural steel of building (for interior-mounted or exterior mounted
lightning suppressors, attach with a cad weld)
• Central Office ground plate (usually for interior-mounted lightning
suppressors)
4 Two lengths of cable are required. Plan the cable route and measure the
length of cable required between the antenna and the lightning suppressor,
and between the lightning suppressor and the shelf.
5 Determine the two separate –48 V power sources for the shelf. If only one –
48 V power source is available, it must be cabled to both TimeSource 3100
power inputs.
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