IBUC Operation Manual 3-1
Terrasat Communications, Inc.
Rev. A
Chapter 3 IBUC Systems: Component
Descriptions
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As described in earlier chapters the ODU consists of an Intelligent Block Upconverter
(IBUC) and could include a Power Supply Unit for IBUC’s (PSUI) and / or a Low Noise
Blockconverter (LNB). The indoor IFU may also be part of the configuration. This
chapter explains the functionality of each component and their interrelationships. Refer
to chapter 9 for the specifications of each of the components.
Intelligent Block Up-Converter (IBUC)
The IBUC is the heart of the Terrasat ODU. The IBUC comes in a variety of frequency
band and power level configurations. The IBUC is available in Standard C-band,
Palapa C-band, Insat C-band, Extended C-band, Standard Ku-band, Extended Ku-
band and Full Ku-band. The C-band IBUC is available in 5, 10, 20, 25, 40, 60, and 80
watt configurations. The Ku-band IBUC is available in 4, 8, 12, 16, 20, 25, 30 and 40
watt configurations. The IBUC houses the IF Interface (de-mux), the Upconverter
(UPC), the Monitor and Control (M&C) card, a DC to DC converter and associated
circuitry, and a Solid State Power Amplifier (SSPA) assembly. The 20-80 watt C-band
IBUC’s and the 12-40 watt Ku-band IBUC’s also have an external cooling fan
assembly. The interface with the IBUC is through a 50Ω or 75Ω (optional) coaxial cable
that carries the L-Band transmit signal, 10 MHz reference oscillator signal, DC power
and bi-directional M&C FSK signals. The IBUC also comes standard with an M&C port
for TCP/IP, RS-232, RS-485, and Hand Held Terminal access. The IBUC also provides
a status alarm output (Form-C relay). A multi-function LED is installed on the IBUC to
provide visual status indications.
Refer to the IBUC block diagram on page 3-3.
DC Supply
For lower power units (12W and below) DC power can be applied through the L-band
input N-connector or F-connector (J1) or through the external power connector (J3).
DC power for the higher power units (16W and above) is applied through the DC input
6-pin circular connector (J3). The high power units cannot accept the DC input through
the L-band input N-connector or F-connector (J1) due to the higher current draw. In all
cases the DC power input source is automatically sensed and protected so that an
input to one connector does not result in an output to the other connector. If for some
reason a DC power source is applied to both connectors simultaneously the protection
circuitry prioritizes which DC power source will be utilized. The priority connector is the
DC input 6-pin circular connector (J3).
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