Which technology allows Extron systems to transmit control signals over existing networks?

The technology that allows Extron systems to transmit control signals over existing networks is AV over IP. This approach utilizes standard networking equipment and protocols to send audio, video, and control signals across an IP network. By using AV over IP, Extron systems can leverage the infrastructure of an existing network, allowing for flexible installation and scalability in various applications, such as classrooms, conference rooms, and auditoriums.

AV over IP also facilitates the integration of different devices and systems, making it possible to control multiple AV sources and destinations through a unified system. This technology is particularly beneficial in environments where multiple rooms or areas need to share resources efficiently.

In contrast, the other options represent different methods or technologies: Power over Ethernet is primarily focused on delivering power to devices over Ethernet cables, HDBaseT is used for sending high-definition video and audio over long distances using a single cable, and Wireless LAN allows for devices to connect wirelessly but does not inherently provide AV signal transmission capabilities like AV over IP does.