The SDVN-4S-P is a 4-port, single-head dual-link DVI-I Secure KVM switch with a dedicated CAC port and support for 4K (3840x2160 @ 30Hz) resolution video via an adaptor. The SDVN-4S-P allows users to control KVM (Keyboard, Video and Mouse) operation on up to four computers with DVI, HDMI or VGA displays. It features mechanical, electrical and optical signal isolation to prevent hacking and data leakage in environments where security is paramount.