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Each AU IDU includes two 3.5/1.75 MHz PHY channels that can connect to one or
two ODUs. The AU-IDU module connects to the AU ODUs via Intermediate
Frequency (IF) cables carrying full duplex data, control and management signals
between the AU-IDU and the AU-ODU, as well as power (-48 VDC) 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.
1.2.4
AU-ODU
The AU ODU is a 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
larger channels (e.g. 7/14 MHz) or using an IF multiplexer.
There are two versions of the AU-ODU:
AU-ODU: Maximum output power of 28 dBm
¢
AU-ODU -HP (High Power ODU): Maximum output power
¢
of 34 dBm. The AU-ODU-HP is currently available in the 3.5 GHz bands (3.5a
and 3.5b). Because of the higher power consumption, the AU-ODU-HP should
be powered by an ODU Power Feeder.
NOTE
For convenience, all references in this manual to AU-ODU are applicable also for AU-ODU-HP,
unless explicitly stated otherwise.
1.2.5
Power Feeder
The ODU Power Feeder is used to provide power
(-48 VDC) to AU-ODU-HP High Power ODUs. It
transfers transparently all signals between the
AU-IDU and the ODU, while injecting DC power
received from an external source. Each ODU
Power Feeder unit can serve up to four High
Power ODUs. Up to three ODU Power Feeder units can be installed in a 1U high
Power Feeder panel.
WiLink-I Modular Base Station System Manual
Base Station Equipment
7
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