GlobalTime NTP Products
7
Chapter 2
Hardware installation and commissioning
2.1
The device structure
Figure 2-1
Device structure
GTT-100 network time server consists of the outdoor part and interior part. The outdoor part
is composed of the GPS satellite receiving antenna, surge arrester and antenna amplifier
(optional).
The function is to complete the reception of satellite signals.
The interior part is the master device of GTT-100 network time server to complete the
functions of the satellite signal demodulation, the local clock calibration, achieving NTP
protocol and so on. It provides NTP timing service to other network equipment by 10M
network ports. The following are the detail installation description of the outdoor part and the
interior part.
2.2
Outdoor installation
The outdoor part is composed of the GPS satellite receiving antenna, transmission cables
and antenna amplifier. The installation attentions are as follows:
At first, the antenna installation location needs to be carefully selected, which will
significantly influence function of equipment. The antenna should be installed in high
position, and can not be blocked by, such as the roof, open top, etc. If you want to achieve
better results, you
’
d better keep the elevation angle of 15 degrees from blocking. Please do
not install the antenna inside the room,
because GPS satellite signal is very weak and can
not be received indoors. It does not matter if there are trees or plastic rain shelter above the
GPS receiving
antenna
Antenna amplifier
Lightning arrester
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GTT-100
