User's Manual

Table Of Contents
Base Station Equipment
BreezeMAX Modular Base Station System Manual 9
1.2.5.4 4
th
Order Diversity
Multiple channel configuration with fourth order diversity allows a single sector
coverage by a single AU-IDU with 4 ODUs. In each sector, both space and
polarization diversities are implemented, using dual polarization slant antennas.
The channels are paired: channels 1 and 2 form one pair, channels 3 and 4 form
the second pair. The two ODUs connected to each pair are connected to the same
dual polarization antenna. The same frequency and transmit power are set for all
four ODUs. All ODUs served by the same AU-IDU share a common MAC and
modem.
1.2.6 Power Feeder
The Base station’s PIU can support a maximum current of 35 A (@-40.5 VDC).
Using proper design considerations, up to six AU-ODU-HP units can be powered
directly from the Base Station (via the back panel and AU-IDUs). The ODU Power
Feeder is used as an additional power source providing power (-48 VDC) to
AU-ODU-HP High Power ODUs. It transfers
transparently all signals between the AU-IDU
and the ODU, while injecting DC power received
from an external source. Each ODU Power
Feeder unit can serve up to four High Power
ODUs. Up to three ODU Power Feeder units can
be installed in a 1U high Power Feeder panel.
The following table displays the number of ODUs
and Power Feeder modules required for various radio configurations: