Designed for use in secure defense and intelligence applications, this SDPN-4S 4-Port Single-Head 4K DisplayPort KVM Switch from IPGard features mechanical, electrical and optical signal isolation to prevent hacking and data leakage. It controls data relays using inverted signals, shielding connections from outside intrusion by forcing them to work one at a time. Each port uses its own isolated data channel and each unit features a non-reprogrammable ROM to protect the switch's functions. The switch emulates the presence of a keyboard and a mouse for every attached computer through a USB cable, preventing direct connection between the peripherals and the connected computer.

The switch simulates a generic EDID, allowing it to operate most of the connected monitors. Both selected and non-selected computers maintain a constant connection with the unit's video and AUX emulation controllers, restricting discovery of newly connected monitors during switching operations. The unit then prevents unwanted and unsecure data from getting transmitted through DDC lines by means of secure EDID learning and emulation.