Alvarion Technologies Ltd. BMAX-BA36 Manuale Utente
Base Station Equipment
BreezeMAX Modular Base Station System Manual
11
1.2.7
Power Interface Unit (PIU)
The single Euro PIU module is the interface between the Base Station site's DC
power source and the Base Station chassis PSUs and external AU ODUs, which
receive power via the AU-IDUs.
power source and the Base Station chassis PSUs and external AU ODUs, which
receive power via the AU-IDUs.
The PIU filters and stabilizes the Base Station input power and protects the
system from power problems such as over voltage, surge pulses, reverse polarity
connection and short circuits. It also filters high frequency interference (radiated
emissions) and low frequency interference (conducted emissions) to the external
power source. Each Base Station chassis contains two slots for an optional 1+1
PIU redundancy. One PIU is sufficient to support a fully populated chassis. Two
PIU modules provide redundant power feeding (two input sources) while avoiding
current flow between the two input sources.
system from power problems such as over voltage, surge pulses, reverse polarity
connection and short circuits. It also filters high frequency interference (radiated
emissions) and low frequency interference (conducted emissions) to the external
power source. Each Base Station chassis contains two slots for an optional 1+1
PIU redundancy. One PIU is sufficient to support a fully populated chassis. Two
PIU modules provide redundant power feeding (two input sources) while avoiding
current flow between the two input sources.
Table 1-1: Number of AU-IDUs, AU-ODUs and Power Feeders Required for Various Configurations
with regular PIU(s)
Diversity
Mode
Mode
Number of Sectors
(AU-IDUs)
(AU-IDUs)
Number of
ODUs
ODUs
Number of
Power Feeders
Power Feeders
Second Order
Diversity
3
6
-
4
8
-
6
12
1
Fourth Order
Diversity
3
12
1
4
16
2
6
24
4
Table 1-2: Number of AU-IDUs, AU-ODUs and Power Feeders Required for Various Configurations
with High-Power PIU(s)
Diversity
Mode
Mode
Number of Sectors
(AU-IDUs)
(AU-IDUs)
Number of
ODUs
ODUs
Number of
Power Feeders
Power Feeders
Second Order
Diversity
3
6
-
4
8
-
6
12
-
Fourth Order
Diversity
3
12
-
4
16
-
6
24
1