The DSX interface enables patching, terminating and rearranging of circuits as traffic patterns change and demands on the network grow. At DS3 (44.736 Mbps) digital signal rates, DSX equipment connects NEs such as office repeaters, fiber optic terminals, digital loop carriers, multiplexers, and digital cross-connect systems.

Each NE is permanently cabled to a DSX-3 module. Any two NEs can be connected to each other in a non-dedicated manner by means of a semi-permanent cross-connect jumper between two DSX-3 modules or terminations. The cross-connect jumper allows flexibility for future network reconfiguration. Internal jack circuits provide input/output connections to each digital signal source.