Front Panel; Front Panel Status Leds - Spectracom SecureSync User Reference Manual

1.5 Front Panel
the L1 band at a frequency of 1575.42 MHz. When power is first applied, the GPS receiver begins
searching for the satellites. It does this by searching for each satellite, individually, listening for
each satellite's distinct spread-spectrum hopping sequence. This process can take a few minutes,
as the receiver iteratively locates satellites, refines its position, and determines for which satellites
to search.
The GPS receiver retains the last known position when the power is switched off. This results in
faster satellite acquisition the next time it is switched on. If the antenna has been moved more than
a few miles, however, acquisition time will be slightly longer because it must first re-compute the
position.
Other global navigation systems (GNSS) can be used alongside, or instead of, GPS: The Russian
GLONASS system is fully operational with 24 satellites each transmitting at a slightly different fre-
quency in the L1 band between 1598 and 1606 MHz. This GPS/GLONASS frequency diversity
offers some frequency diversity with GPS for improved performance in some environments when
using while allowing for dual-mode GPS+GLONASS receivers. Other benefits are system redund-
ancy and the availability of additional satellites available when using GPS and GLONASS
together.
1.5

Front Panel

The front panel of the SecureSync unit consists of three separate illuminated status LEDs, a front
panel control keypad, an LED time display, an LCD information display, an RS-232 serial inter-
face, and a temperature controlled cooling fan.
The LCD information display is configurable using the SecureSync Web browser user interface
(also referred to as the "Web UI") or the front panel controls. Display options include status or pos-
ition information, time, date, DOY (Day of Year), GNSS information, as well as network settings.
The RS-232 serial interface and the front panel controls provide a means of initially configuring the
unit's network settings.
Figure 1-1:
1.6

Front Panel Status LEDs

The three status LEDs ("Front panel layout" above),
whether SecureSync is synchronized, whether power is applied to the unit and if any alarms are
currently asserted.
4
Front panel layout
POWER , SYNC
CHAPTER •
1 SecureSync User Reference Guide Rev. 18
, and FAULT , indicate