Appendix C. Redundancy Configuration / Operation; Overview; Single-Base Redundancy Operation - Comtech EF Data MBT-4000 Installation And Operation Manual

Appendix C. REDUNDANCY
CONFIGURATION / OPERATION
C.1

Overview

The MBT-4000 is designed to operate in both stand-alone and redundant configurations. Every
MBT-4000 base contains the circuitry and logic necessary to perform all the functions of a
backup controller in either a single base and dual base configuration. The BDC-4000 is capable of
supplying LNA power over the center conductor of the coaxial cable. 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-4000 base includes two "AUX COMM" connectors. Each of these connectors
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.
Each AUX COMM connector also is capable of supplying power to external LNAs (or other
devices). 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-4000 base includes two "switch drive" connectors. Each of these connectors 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.
C.2

Single-Base Redundancy Operation

Single-Base Redundancy Operation is not supported in the MBT-4000.
C–1