Comtech EF Data MBT-4000B - Manual (Page 79)

B–1
Appendix B. REDUNDANCY
CONFIGURATION / OPERATION
B.1 Overview
The MBT-4000B is designed to operate in both standalone and redundant configurations. Every
MBT-4000B base contains the circuitry and logic necessary to perform all the functions of a
backup controller in either a single base or dual base configuration.
The Bias Tee side of the MBT-4000B provides the 10 MHz reference and DC voltage for the LNB.
This power supply features current monitoring with programmable failure limits. Overcurrent
and undercurrent failures can participate in overall fault indication and redundant switchover
criteria.
Each MBT-4000B base provides the “J9 | AUX COMM” connector. This connector includes a
logic input intended to be connected to contact closure fault indications of external equipment.
Thus, external equipment failure may participate in overall fault indication and redundant
switchover operation. The “J9 | AUX COMM” connector also has a user programmable I/O pin.
When programmed as an output, this pin indicates the online/offline position of the switch
associated with the BUC. This signal can be used to mute the external offline amplifier.
Each MBT-4000B base includes two ‘switch drive’ connectors. Each connector is intended for
driving and monitoring a 28V latching switch. In most installations, one switch drive connector
will drive an RF waveguide switch, while the second switch drive connector will drive an IF
(L-Band) coaxial switch.
B.2 Single-Base Redundancy Operation
The MBT-4000B does not support Single-Base Redundancy Operation.