1.
Through the up-conversion, filtering, and amplification, the IF signal is converted into the
RF signal and then sent to the AMP amplifier unit.
2.
The AMP amplifies the RF signal (the output power of the signal can be controlled by the
IDU software).
3.
After the amplification, the RF signal is sent to the antenna through the diplexer.
The O&M uplink signal is a 5.5 MHz ASK-modulated signal and is demodulated in the CTRL
control unit.
The -48 V DC power signal is sent to the PWR power unit where the secondary power supply
of a different voltage is generated and provided to the modules of the ODU.
Signal Processing in the Receive Direction
In the diplexer, the receive RF signal is separated from the antenna signal. The RF signal is
amplified in the low noise amplifier (LNA). Through the down-conversion, filtering, and
amplification, the RF signal is converted into the 140 MHz IF signal and then sent to the
multiplexer.
The O&M downlink signal is modulated under the ASK scheme in the CTRL unit. The 10 MHz
signal is generated through the modulation and sent to the multiplexer. The CTRL unit also
detects the receive power through the RSSI detection circuit and provides the RSSI interface.
The IF signal and the O&M downlink signal are combined in the multiplexer and then sent to
the IDU through the IF cable.
1.5 Interface
The ODU has the antenna interface, IF interface, RSSI interface, and grounding bolts.
The ODUs are classified into the ODU with the waveguide interface and the ODU with the
coaxial interface according to the type of the antenna interface of the ODU. The antenna
interfaces of the 7-38 GHz ODUs are waveguide interfaces, and the antenna interfaces of the 6
GHz SPA ODUs are coaxial interfaces.
Figure 1-4
Interfaces of the ODU with the waveguide interface
Grounding
bolt
RSSI interface
IF interface
Antenna
interface
OptiX RTN 600 ODU
Hardware Description
1 ODU
Issue 06 (2010-05-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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