Page 9
generally works well on a window-ledge or positioned in a window or wall. As a rule of
thumb, the better the view the antenna has of the sky, the better the signal locks and a good
continuous uninterrupted time signal is provided.
TSU-25 can only be used together with RTU-30t. When more than one RTU-30t card is
installed in the same rack, a Router Module (RTR-10) must be installed.
Running LED (green):
LED flash once every 10 seconds as long as the TSU-25 is powered and the software runs OK.
Sync-LED (yellow):
The LED flashes every second when the GPS-unit is active.
Status-LED (red):
When the TSU-25 does not have a valid time, the Status LED will flash once a second.
Normal operating condition:
The TSU will activate the GPS every 660s (11min) or 2500s (42min) dependent upon the
measured temperature. When the interval expires the GPS will be activated and the Sync-LED
will start flashing. The LED flashes until the clock is updated.
Independent of this update, the TSU-25 sends out a time-sync message on the backplane
bus. The RTU-30T cards that are placed on the same bus will receive this accurate time
information and update the software clock that runs constantly on each individual RTU-30t
card.
This will give an accuracy of +/- 10ms on the time information sent from the RTU upon an
event.
Different types of antennas are
available. The default antenna is a
3.3V active antenna, but other types
of antennas can be used.’
IMPORTANT:
Do NOT change any antenna settings
without consulting NORTROLL AS
first.
Wrong setting can cause permanent
damage to the GPS unit and the TSU-
25.
