Nera WiLink-I 3000, Системное руководство, Страница: 28 / 250

8 System Description
Chapter 1 - System Description
1.2.6 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.
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.
1.2.7 Power Supply Unit (PSU)
The single Euro PSU module is a 48 VDC power supply unit. Each
Base Station chassis can contain up to four PSU modules providing
N+1 redundancy configurations.
Table 1-4 displays the number of PSU modules (excluding
redundant units) required for various Base Station configurations
without NPU redundancy (one NPU):
Table 1-5 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 one NPU (excluding PSU redundancy)
Number of AUs Minimum Required
Number of PSUs
1 - 2 1
3 - 6 2
Table 1-5: PSU Requirements, Configurations with two NPUs (excluding PSU redundancy)
Number of AUs Minimum Required
Number of PSUs
1 - 5 2
6 3