If no antennas are currently connected to NTS-xxxxx /all servers except NTS-dialup/  device following error screen will be shown:

The NTS–4000 requires minimum 5 satellites to be reached continuously in order to get time from GPS properly. This figure is not constant and it is changing in non-regular way. If satellite communication is lost the following message appears:

17-07-2007   Err sats

18:02:21 sat A= 1/12

This requires finding better GPS antenna location otherwise NTS–xxxx cannot obtain time information from GPS antenna. The unit will still work properly but will provide time according to RTC which time need to be setup manually through console and its accuracy is poor.

The LCD shows only a status of the GPS antennas. It does not show status of the other time sources as I/O time interfaces (1PPS, IRIG-B, Dial-up modem etc.). However other time sources can be monitored and traced by a remote software utility ntpq (cl num command of ntpq utility, where num can be guessed from as command).

There another error message “Err sync” is possible to be displayed. It indicates that internal phase/frequency loop is not yet locked or temporary not working, because of 1PPS jitter or too much offset from GPS time.

17-07-2007   Err sync

18:02:21 sat A= 5/12

Last possible error message is “Error call service” message. It means that device is not operating properly (message will show up approx. 30 sec after rebooting). Contact service in this situation for further instructions.

Error call service

+48  22  7517680