IBUC Operation Manual 3-5
Terrasat Communications, Inc.
Rev. A
Power Supply Units (PSUI)
The PSUI converts the universal AC input (100-240VAC) to 24VDC (400W only) 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.
400W or 700W Outdoor PSUI
The AC input to the PSUI is routed through J1 pins 2, 3 and the GND pin. Both the live
and the neutral inputs are fused for maximum protection. The PSUI is designed with an
autoranging power factor corrected AC to DC converter (PFC). The output of the PFC
circuitry is routed to the DC to DC circuitry where it is “converted” to a 24 VDC or
48VDC voltage. The output is filtered and routed to the DC output connector J2. Due to
the current requirements for the higher power IBUC’s, the J2 output connector is wired
with three positive and three negative connections. For the higher power IBUC’s there
is a PSU fan assembly that is required for additional cooling due to the higher current
consumption. The fan assembly is fully external to the PSUI and can be changed
without opening the PSUI. The PSUI with the fan assembly can deliver 700W at
48VDC.
An interconnecting DC cable is provided with the PSUI in addition to a mating AC input
connector.
Interface Unit (IFU)
Refer to IFU block diagram on page 3-6.
The AC input to the indoor IFU (Interface Unit) is routed through an IEC power entry
module. The power entry module houses a line filter, live and neutral fusing and an
On/Off switch. This unit can have up to two Power Supplies internally, a 200W 24V or
48V for the IBUC and a 28W 24V for the 10MHz OCXO and LNB. The outputs of both
AC/DC converters are routed to the Interface card, where they’ll be multiplexed to the
L-Band to feed the IBUC and the LNB, and in case of the 28W supply, converted to
12VDC to feed the OCXO. On the transmit side, the signal from the modem (J1 Tx IN)
is routed to the de-multiplexer where all signals are split off (DC Supply IN, FSK,
10MHz IN, L-Band IN) and routed through separate circuits where there are a series of
jumpers that allow the units to be configured, for internal or external DC supply and / or
10MHz reference, depending on customer requirements. Once selected, all these
signals will be multiplexed again and routed to J2 (Tx OUT). On the receive side, the
same architecture applies. On J4 (Rx IN) we have 24V OUT, 10MHz OUT and L-Band
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