GlobalTime NTP Products
User manual of GTT-030
4
The back panel is as shown above. There is a power socket with a fuse on the back panel. After opening
the fuse base, there are a primary and a reverse fuse with specification of 0.5A on each side to facilitate
users
’
replacement. In addition, there is also an antenna plug as well as 50 ohm BNC Socket.
Chapter 2
Hardware installation and commissioning
2.1
The device structure
Figure 2-1
Device Structure
GTT-030 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-030 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 means of 10/100M Base-T adaptive network ports.
The following are the detail installation description of the outdoor part and the interior part.
2.2
O
utdoor installation
The outdoor part consists of the GPS satellite receiving antenna, surge arresters, transmission cables
and antenna amplifier. The installation attentions are as follows:
At first, the antenna installation location needs to be carefully selected, which will signigicantly influence
the equipment working. The antenna should be installed in high places and can not be blocked, such as
the roof, open top, etc. If you want to achieve better results, you
’
d better keep the elevation angle of 15
degrees not blocked. It is useless to install the antenna inside the room because GPS satellite signal is
very weak and can not be received indoors. It is no matter if there are trees or plastic rain shelter blocked
above the antenna, but other block will influence the signal significantly. In fact, only a book above the
antenna can completely block out the satellite signal.
GPS
receiving
antenna
Antenna amplifier
Lighting arrester
GTT-030
