IBUC Operation Manual
Terrasat Communications, Inc.
Rev. A
2-2
consists of a 50 or 75 Ω (optional) coaxial cable that carries the L-Band receive signal,
10 MHz reference oscillator signal, and DC power.
Table 2-2 Receive Frequency Plans
Standard Palapa Insat
Signal C-band C-band C-band Ku-band
RF fr. 3.625-4.200GHz 3.400-4.200GHz 4.500-4.800GHz 10.95-11.70GHz or
11.70-12.20GHz or
12.25-12.75GHz
L-band Out fr. 950-1525MHz 950-1750MHz 960-1260MHz 950-1700MHz or
950-1450MHz
Noise temperature 35°K 35°K 35°K 60°K
The PSUI converts the universal AC input (100-240VAC) to 24VDC or 48 VDC to
power the IBUC. The 400W outdoor PSUI comes in a single weatherproof housing
suitable for antenna mounting and can power 5-40W C-band and 4-25W Ku-band
IBUC’s. The 700W outdoor PSUI comes in a single weatherproof housing suitable for
antenna mounting. The 700W PSUI includes a cooling fan and a fan housing and can
power 60-80W C-band and 30-40W Ku-band IBUC’s.
Indoor Equipment
The indoor IFU (Interface Unit) allows the integrator to multiplex a 10MHz reference, a
DC voltage (24V or 48V) for Low Power IBUC’s (up to 12W Output Power), as well as
24V DC supply for the LNB, in case the Modem doesn’t offer these features. Any
combination can be configured at the factory; for example, IBUC Supply only, 10 MHz
reference only, both IBUC Supply and 10 MHz, etc. The IFU also provides a pass for
the FSK signal, allowing the Modem to communicate with IBUC. The IFU is housed in a
1RU rack mount (19 inches) and has to be connected between the Modem and the
IBUC and LNB.
System Configurations
Figures 2-1, 2-2 and 2-3 show typical earth station installations using Terrasat
transceivers. In normal operation the IBUC, the LNB, and the PSUI are mounted
outdoors on the antenna. The IBUC and the LNB can interface directly to a satellite
modem, a 70MHz to L-band rackconverter, a modem combiner network, or an IFU. In
any case, the indoor unit must provide the 10MHz for the LNB and the IBUC, the DC
voltage for the LNB, and the TX L-band signal for the IBUC. The modem may supply the
DC voltage via the IFL cable to the IBUC (4-12Watt units). In addition, the indoor
equipment will receive the RX L-band signal from the LNB.
Monitor and Control (M&C) is available via an FSK signal (through the IFL) or through a
separate cable for either RS-232, RS-485 or TCP/IP. A Hand Held Terminal is available
for local M&C. Refer to chapter 6 for actual M&C capabilities and commands for the
IBUC.
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