GlobalTime NTP Products
User manual of GTT-030
14
Then, verify the outdoor antenna is well connected, such as verifying the outdoor joints are tight, the
connectors are waterproof, the antenna is aleak and so on. You should troubleshoot the obvious
problems one by one.
Last, disconnect the antenna connector and measure the resistance of the feeder. When the remote end
is open, the near-end resistance should be infinite. Besides, when the remote end is shorted, the
near-end resistance will be only a few ohms. If it is shown abnormal, verify the feeder and the connctor is
intact. The normal faults: the quality of the line is not good; the connectors are not done well; lines are
scratched or bitten by small animals, etc. If the feeder is added a lightning arrester or an antenna
amplifier in the middle, you still need to verify the two components is intact.
After eliminating the above breakdown, if it still can not receive the satellite signal, please contact the
service hot line of Shanghai GlobalTime Electronic Co., Ltd. Our engineers will help you with the further
processing.
3.5.3
Can not ping the time server after configuration
First, verify the physical network connection. You can see if the corresponding connection-status light is
normal by observing HUB or switch connected with the time server.
And then check if there is something wrong with the network settings. You can use a crossing cable to
connect the server to the computer directly to see if ping is ok.
Then use HUB to test in the same network segment. Finally test the different segments. Following these
steps, it is easy to troubleshoot. Some firewall software on your computer will provide a protective
screen from ping operation. So it
’
s better to check the network after turning off the firewall.
You may also verify the IP address without devices and the IP reply set by the time server.
3.5.4
Instable state of receiving satellite signal/equipment is in hold mode
In general, it is caused by the improper site selection of the satellite receiver antenna. If this state shows
often, you should consider to select another site to install the antenna, that is, a place free of anything
overshadowed and the surrounding microwave interference.
3.5.5
The client can not receive timing service
NTP protocol usually proceeds timing service through port 23 with UDP protocol and sometimes with
TCP protocol. So port 23 service should be allowed to go through the intranets gateway and the firewall.
Please check the gateway and the firewall configuration.
