Juniper ACX500 Hardware Manual page 109

Copyright © 2016, Juniper Networks, Inc.
At least 3 feet (1 m) away from any metallic objects, such as radio tower, other antenna
mast, electrical poles, and so on.
At least 3 feet (1 m) below the highest point of a lightning rod.
Convenient path for running the outdoor coaxial cable from the GNSS antenna to the
network.
Install the router in compliance with the local, national, or international electrical codes:
United States—National Fire Protection Association (NFPA 70), United States
National Electrical Code, Article 810
Canada—Canadian Electrical Code, Section 54
Protect the GNSS antenna from environmental conditions such as foot traffic, standing
water, and any mechanical stressor that might compromise the cable integrity. Wherever
applicable, run smaller size cabling through dedicated outdoor-rated electrical conduit.
WARNING:
Locate the GNSS antenna away from power lines, lighting systems, HVACs
(heating, ventilation and air conditioning), and power circuits.
When installing the GNSS antenna, do not touch power lines or other
sources of "live" power.
Have a qualified technician or a certified electrician perform the installation.
Observe all local and regulatory standards and ordinances.
Grounding the unit (metal mast or ground cable to the unit's base) is
required for the lightning protection to work properly.
The ACX500 Timing Server can maintain accurate time even if an antenna is mounted
in a location that has limited visibility of GNSS satellites; however, we recommend
obstructions should be minimized. Limitations to satellite visibility for an antenna include
overhanging foliage or tall structures. Such structures can block the GNSS signal from
the antenna and cause gaps in the GNSS satellite signal reception. In locations where
satellite visibility is limited, keep in mind the following guidelines:
Position the antenna on the side of the structure with good visibility toward the equator
where more satellites are visible. For example, if you are in the northern hemisphere,
place the unit on the southern side of the structure unless that view is restricted or
blocked. If that view is restricted or blocked, place the unit on the east or west side of
the structure. Avoid the polar side where there are fewer visible satellites.
Ensure that the GMT time zone parameter is set while you configure the Timing Server.
To avoid any potential damage to the GNSS antenna and the router, do not install the
antenna in the proximity of any transmitting RF or high-voltage power sources. This is
both a hardware precaution as well as a personnel safety precaution. Follow all local
building code requirements, as well as the local building electrical codes for power
and grounding.
Chapter 9: ACX500 Timing Server Specifications
89