System Manual

BreezeCOMPACT System Manual
Chapter 1: System Description
BreezeCOMPACT Features
39
1.5.8
Spectrum analyzer
The spectrum analyzer functionality was developed to help field engineers to define the best (less
interfere) channel for BreezeCOMPACT during the installation and commissioning. This
function is critical in unlicensed bands, such as in 3.65 GHz – 3.7 GHz in the US and Canada,
where other transmitting devices may interfere with the BreezeCOMPACT. In addition, it allows
operator in licensed band to identify existence of interference from other sources which may not
be allowed to use the spectrum.
1.5.9
GPS
GPS is used to synchronize the air link frames of Intra-site-located and Inter-site-located BTSs,
in order to ensure that the air frame starts at the same time in all base stations (BSs), and that
all BSs switch from transmit (DL) to receive (UL) at the same time. This synchronization is
necessary for preventing Intra-site and Inter-site interference and BS saturation (assuming that
all BSs operate with the same frame size and with the same DL/UL ratio).
The all-outdoor GPS receiver is a pole-mountable GPS receiver and antenna in a single
environmentally protected enclosure that is powered from the unit.
GPS Chaining
is supported where the chaining enables the use of a single GPS receiver for
several collocated units (up to 4 BreezeCOMPACT units). The figure below describes the GPS
chaining connectivity.
Figure 20: GPS Chaining
In case of GPS chaining, the chained units depend on proper operation of the
feeding units (Master or Slaves). Therefore for better redundancy general
recommendation would be to use single GPS per BreezeCOMPACT