Table 1-3: Psu Requirements, Configurations With One Npu; Table 1-4: Psu Requirements, Configurations With Two Npus - Alvarion BreezeMAX 3500 System Manual

Chapter 1 - System Description
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.
Power Supply Unit (PSU)
The single Euro PSU module is a 48VDC power supply unit. Each Base
Station chassis can contain up to four PSU modules providing N+1
redundancy configurations.
Table 1-3 displays the number of PSU modules (excluding redundant
units) required for various Base Station configurations without NPU
redundancy (one NPU):

Table 1-3: PSU Requirements, Configurations with one NPU

Number of AUs
1 - 2
3 - 6
Table 1-4 displays the number of PSU modules (excluding redundant
units) required for various Base Station configurations with NPU
redundancy (two NPUs, not supported in current version):

Table 1-4: PSU Requirements, Configurations with two NPUs

Number of AUs
1 - 5
6
1-8
(excluding PSU redundancy)
Minimum Required Number of PSUs
1
2
(excluding PSU redundancy)
Minimum Required Number of PSUs
2
3
BreezeMAX System Manual