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OTMC 100 Series User Manual
4
Mounting
4.1
Safety Instructions
A position with good view to the sky will usually be located in a lightning endangered zone outside of a
building. The OTMC 100 must not be exposed to direct lightning strokes and thus has to be protected
sufficiently. Therefore, the OTMC 100 has to be mounted in an area protected by a lightning protection
system according to the relevant standards and regulations. The user is responsible for sufficient
lightning protection of the device and the observance of all lightning protection regulations relevant for
the site of installation.
Always use the waterproof RJ45 Ethernet connector supplied with the OTMC 100 in order to maintain
the watertightness of the device. Do not use the OTMC 100 outdoors without a waterproof connector
inserted.
CAUTION! Risk of injury or damage due to high voltages caused by lightning stroke.
•
The installation of the OTMC 100 and the implementation of lightning protection
measures have to be performed by accordingly qualified experts.
•
Always observe all relevant lightning protection regulations.
•
The local lightning protection regulations and the protection concept of the building and
the electrical installation may require a suitable surge protection device for the Ethernet
network cable leading into the building.
•
For outdoor installation always use shielded Ethernet cable. The cable shield has to be
connected to the shield of the Ethernet connectors.
4.2
Suitable Mounting Positions
The OTMC 100 receives the time information from the satellites of the GPS system. However, GPS
reception generally requires a plain line of sight between the antenna and the satellites.
For proper function, the OTMC 100 requires signal reception from at least 4 GPS satellites. The more
satellites it can receive, the more reliable the time information the OTMC 100 can deliver.
The OTMC 100 should generally be mounted outdoors at a location that provides free view in a range
of 180° vertically to the sky and 360° horizontally around the device. The view to the sky must not be
blocked by any objects. This is usually given when mounting the OTMC 100 on a roof or a sufficiently
high mast. Refer to the figure below.
You should furthermore consider that GPS signals may be reflected by large buildings and structures
around the OTMC 100, which may deteriorate the timing accuracy of the OTMC 100.
Always mount the OTMC 100 in an upright position with the protective cap to the top, as shown in the
figure below. The RJ45 connector on the base plate of the OTMC 100 must point vertically
downwards. Do not mount the OTMC 100 inclined to any side or with the base plate to the top!
14
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