IBUC Operation Manual
Terrasat Communications, Inc.
Rev. A
2-1
Chapter 2 IBUC Systems: Description
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Functional Description
Outdoor Equipment
The Terrasat line of C-band and Ku-band Outdoor Units (ODU’s) consists of a range of
Intelligent Block UpConverters (IBUC’s), Power Supply Units for IBUC’s (PSUI’s), and
Low Noise BlockConverters (LNB’s) for use in satellite earthstations. The outdoor
equipment is designed to interface directly with an L-band satellite modem.
The Interfacility Link (IFL) between the ODU’s and the L-band modem utilizes 950 to
1750 MHz (L-Band) as the interface frequency. This approach allows transmission and
reception over the entire satellite band as opposed to a single transponder. The L-band
IFL also carries associated signals (10MHz, DC voltage, FSK) simplifying installation
and reducing costs. Terrasat IBUC’s are available in C-Band or Ku-band and can be
used for SCPC/MCPC, point-to-point, or point-to-multipoint network applications (voice,
data, video or IP services). All outdoor units are weatherized and designed to mount
outdoors, in most climates, and on most satellite earthstation antennas. Refer to Figures
2-1, 2-2 and 2-3 for typical equipment configurations.
The IBUC is available in Standard C-band, Palapa C-band, Insat C-band, Extended C-
Band, Standard Ku-band, Extended Ku-band, or Full Ku-band. See Table 2-1 for actual
frequencies. 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 input
interface to the IBUC interfaces to a 50 Ω or 75 Ω (optional) coaxial cable that carries
the L-Band transmit signal, 10 MHz reference oscillator signal, DC power and bi-
directional M&C FSK signals.
Table 2-1 Transmit Frequency Plans
Standard Palapa Insat Extended Standard Extended Full
Signal C-band C-band C-band C-band Ku-band Ku-band Ku-band
L-band 950-1525MHz 1150-1450MHz 1150-1450MHz 950-1750MHz 950-1450MHz 950-1450MHz 950-1700MHz
LO fr. 7.375GHz 7.875GHz 8.175GHz 7.600GHz 13.050GHz 12.800GHz 12.800GHz
RF fr. 5.850-6.425GHz 6.425-6.725GHz 6.725-7.025GHz 5.850-6.650GHz 14.00-14.50GHz 13.75-14.25GHz 13.75-14.50GHz
Output
Power
5,10,20,25,40,
60, 80W
5,10,20,25,40,
60, 80W
5,10,20,25,40,
60, 80W
5,10,20,25,40,
60, 80W
4,8,12,16,20,25,
30,40W
4,8,12,16,20,25,
30,40W
4,8,12,16,20,25,
30,40W
The LNB is available in Standard C-band, Palapa C-band, Insat C-band, or one of three
Ku-band frequency bands. See Table 2-2 for actual frequencies. The C-band LNB
comes standard with a typical noise temperature of 35
o
K whereas the Ku-band typical
noise temperature is 60
o
K. The LNB houses the Low Noise Amplifier (LNA), the RX
conversion circuitry, and the L-band IF Interface (de-mux). The interface with the LNB
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