IBUC Operation Manual
Terrasat Communications, Inc.
Rev. A
7-35
TX L-band input level is misadjusted or turned off
Water in the IBUC due to no gasket in the waveguide or a hole in the feed window.
Water in the coax connectors
Incorrect frequency settings
Repair Policy
The Terrasat Redundant Systems are not field repairable.
In the event that a failure has been detected it may be necessary to return the defective
unit to the factory. Refer to chapter 1 for returning a defective unit to the factory.
M&C Functions
Description of Operation
The TX and RX redundancy systems are designed to provide an interface for user
configuration and control of the systems. In the TX system, the IBUC’s monitor status
can initiate switching when required. The unit in position B can be commanded to clone
itself to the unit in position A. This ensures that IBUC B is configured identically to IBUC
A. M&C features available in the IBUC are available via the interface box enabling a
single point of control for both IBUC’s. Commands and alarms unique to the
redundancy systems are built in to the IBUC M&C software.
The interface box includes an Ethernet hub to enable the user to monitor and control
both IBUC’s in TCP/IP with one Ethernet connection and cable.
For remote operation the Redundant Systems are equipped with a Monitor and Control
function. The I/O includes, an FSK modem interface, an RS-232 interface, an RS-485
interface, a handheld terminal, an Ethernet interface, one Multi-function LED, and one
alarm relay closure (Form-C).
USER INTERFACES
1) Tx and Rx Systems: a bank of LED’s provide visual indications of Tx 1+1 and
Rx 1+1 status.
2) Hand Held Terminal (HHT) is an optional item that may be used to access the
Tx and Rx Systems for local M&C via the M&C ports J1 (IBUC A) and J8 (IBUC B)
for Tx Systems and port J1 for Rx Systems. The HHT has a 4 row x 20 column
display with 4 function keys (F1-F4), a numeric keypad (0-9), and YES, No, BKSP
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