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Chapter 1 - System Description
1.4.1.3
Access Unit (AU)
The AU comprises an Indoor Unit (IDU) and a
Euro AU-IDU module connects to the AU-ODU via an Intermediate Frequency (IF)
cable. The IF cable carries full duplex data, control and management signals
between the AU-IDU and the AU-ODU,
synchronization reference clock from
Rx frequencies are 240 MHz and 140 MHz, respectively. IDU-ODU s
channel at 14 MHz serves for bi-directional control, status and mana
signaling.
1.4.1.3.1
AU-IDU
The double Euro AU-IDU module contains the wireless
IEEE 802.16a MAC and modem and i
wir ess network connection establishment and for bandwidth
el
man
agement. Each AU-IDU connects to the NPU via the back
plane
. In addition, each AU-IDU connects to all other AU/NIU
slots via the back plan
TDM tra
Each AU-IDU includes two 3.5/1.75 MHz PHY channels that
provide provisioning to the planned support for a future release
of 2
order of diversity and
nd
current release, a single channel is supported.
1.4.1.3.2
AU-ODU
The U-ODU is a high power, full duplex multi-carrier
A
radio unit that connects to an external antenna. It is
desi
gned to provide high system gain and interference
robustness utilizing
figure. It
future op
of a multiplexer or larger channels (e.g. 7/14MHz).
1.4.1.4
Power Interface Unit (PIU)
frequency interference (conducted emissions) to the external power source
Base Station chassis c
10
e over a shared bus for futur
ffic connectivity.
IF
high transmit power and low
supports a bandwidt
h of up to 14 MHz, enabling
tions such as incre
ased capacity through the use
The single Euro PIU m
Station site's DC pow
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 als
filters high frequency interference (radiated emissions) and low
ontains two slots for an optional 1+1 PIU redundancy. One
n Outdoor Unit (ODU). The double
as well as power (48 VDC) an
the AU-IDU to the AU-ODU. The IF Tx and
s responsible for the
e support of
and radio link redundancy. In the
noise
odule is the interface between the Base
er source and the Base Station chassis PSUs
d 64 MHz
ervice
gement
. Each
BreezeMAX System Manual
o
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