User's Manual

Table Of Contents
12 System Description
Chapter 1 - System Description
The regular PIU can support a total current of up to 35 A (@40.5
VDC), enabling support of a Base Station with up
to 8 High-Power AU-ODUs (4 sectors using
second order diversity). For configurations with a
higher number of ODUs it is necessary to use
Power Feeder(s). The High-Power PIU can support
a total current of up to 58 A, enabling support of
up to 20 High-Power AU-ODUs. For
configurations with a higher number of ODUs (6
sectors with fourth order diversity) it is necessary
to use a Power Feeder.
1.2.8 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 1-3 displays the number of PSU modules (excluding
redundant units) required for various Base Station configurations
without NPU redundancy (one NPU):
1.2.9 Air Ventilation Unit (AVU)
The 2U high AVU includes a 1U high integral chamber for inlet airflow and a 1U
high fan tray with an internal alarm module. To support high availability Base
Station, the fan tray includes 10 brush-less fans, where 9 fans are sufficient for
cooling a fully loaded chassis. A failure in any of the fans is indicated by both the
front panel LEDs and a trap that is sent to the management system. To further
support high availability, the chassis may operate with the hot-swappable fan tray
extracted from it for a period of time sufficient for replacing it (up 10 minutes).
1.2.10 GPS
GPS is used to synchronize the air link frames of Intra-site and Inter-site located
sectors to ensure that in all sectors the air frame will start at the same time, and
Table 1-3: PSU Requirements, Configurations with one NPU (excluding PSU redundancy)
Number of AU-IDUs Minimum Required
Number of PSUs
1 - 2 1
3 - 4 2
5 - 6 3