The DSX-4H-MBRC is a 3-port rear cross-connect DSX-3 module with midsize jacks.

This basic 3-port module includes intrusive IN and OUT switching jacks, and one non-intrusive MONITOR jack that is bridged to the OUT jack. Each module has a red LED. All jacks incorporate "make-before-break" contacts which ensure that signals are not interrupted during patching.

The DSX-4H rear cross-connect modular product family accommodates up to 18 modules into a 19-inch (48.26 cm) wide mounting chassis and up to 24 modules into a 23-inch (58.42 cm) wide mounting chassis.