Installation & Operation Manual Chapter 2

FibeAir 1500 Installation & Operation Manual Chapter 2. Theory of Operation
Revision 2.0 Out Door Unit (ODU) 2-5
2.2.5. Power Supplies
The power supply features:
n Standard Input: -48VDC
n DC input range : -40.5VDC to –72VDC
n DC/DC converter.
n Reverse polarity protection.
n Over-voltage and over-current protection.
n Detection of IDU-ODU cable alarms (i.e. cable open, cable short).
The ODU receives its DC power from the IDU. The PWR LED on the front
panel of the IDU continuously lights to indicate the existence of input
voltage.
2.3. Out Door Unit (ODU)
The ODU is designed to be fastened to the antenna using four latches. The
antenna is mounted on a standard mounting pole. The ODU is enclosed in a
compact, weather proof enclosure and connects to the IDU via a single
coaxial cable that can extend up to 300m (1000 ft).
The ODU major modules:
n T/R Module – A high sensitivity RF circuitry with full band frequency
tuning range.
n Controller – Controls the ODU and provides ODU status signals, and
accurate received signal level (RSL) reading (in dBm).
n Cable Combiner – Detailed in paragraph 2.2.4.
n Power Supply - Detailed in paragraph 2.2.5.
Figure 2-4 ODU Mounted on the Antenna
Latches