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Access Unit (AU)
The Access Unit is comprised of an Indoor Unit (IDU) and an Outdoor
Unit (ODU). The double 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, as well as power (48VDC) and 64 MHz synchronization
reference clock from the AU-IDU to the AU-ODU. The IF Tx and Rx
frequencies are 240 MHz and 140 MHz, respectively. IDU-ODU service
channel at 14 MHz serves for bi-directional control, status and
management signaling.
AU-IDU
The double Euro Access Unit IDU module contains the wireless
IEEE 802.16a MAC and modem and is responsible for the wireless
network connection establishment and for bandwidth management.
Each AU-IDU connects to the NPU via the back plane over a dual star
100 Base-T bus for IP traffic connectivity. In addition, each AU-IDU
connects to all other AU/NIU slots via the back plane over a shared bus
for future support of TDM traffic connectivity.
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
diversity and IF and radio link redundancy. In the current release, a
single channel is supported.
AU-ODU
The AU-ODU is a high power, full duplex multi-carrier radio unit that
connects to an external antenna. It is designed to provide high system
gain and interference robustness utilizing high transmit power and low
noise figure. It supports a bandwidth of up to 14 MHz, enabling future
options such as increased capacity through the use of a multiplexer or
larger channels (e.g. 7/14MHz).
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.
Manual Revision 1.0
Base Station Equipment
order of
nd
1-7
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