IBUC Operation Manual
Terrasat Communications, Inc.
Rev. A
7-3
Component Descriptions
As described earlier the redundant transmit system includes two IBUC’s of the same
frequency band connected to an interface box at the input and an RF switch. An
external power supply, PSUI-524, PSUI-548 or PSUI-648, is required for each IBUC.
Low power Redundant Systems can also be powered by an indoor rack-mount Dual
Power Supply, PSUI-1024 (24VDC) or PSUI-1048 (48VDC). This section explains the
functionality of each component and their interrelationships.
Intelligent Block Up-converter (IBUC)
Refer to Chapter 3.
Tx 1+1 Interface Module
Refer to the Tx 1+1 Interface Module block diagram on page 7-4.
The Tx 1+1 Module is powered by both IBUC’s through connectors J2 (IBUC A) and J4
(IBUC B). Both supply inputs feed a linear regulator that generates the voltage for all
internal circuitry. The RS-232 interface, the power for the Handheld terminal and the
alarm output (normally open; faulted: short to ground) from IBUC A & B are routed to
connectors J1 (IBUC A) and J8 (IBUC B). The RS-485 interface coming from both
IBUC’s (connectors J2 and J4) are connected together and routed to the User Interface
(connector J3). The Ethernet ports from IBUC A & B (connectors J2 and J4) are routed
to the User Interface (connector J3) through an internal Ethernet switch. The Alarm
Output of IBUC A is routed to the Alarm Input of IBUC B and vice-versa. This way, IBUC
A & B monitor each other. The switch command from IBUC A & B are connected
together and routed to the Waveguide Switch connector (J9). The Waveguide switch
indicators (connector J9) are routed to both IBUC’s (connectors J2 and J4). The Tx
Input (L-band, 10MHz and FSK) from connector J6 is routed to a splitter (it also blocks
DC, if present at J6). The outputs of the splitter are routed to connector J5 (Tx output A)
and J7 (Tx output B). The Tx 1+1 module also has a bank of LED’s that provide a visual
indication of the power (green if it’s OK), Ethernet activity for IBUC A, IBUC B and User
Interface, and status of both IBUC’s, as well as which IBUC is online.
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