The Network Technologies XTENDEX is a 4K 18Gbps HDMI Extender (AV-over-IP) via fiber optic cable that remotely drives an Ultra-HD 4Kx2K 60Hz 4:4:4 HDMI display, audio, IR and RS232 up to 24.8 miles (40 kilometers) away from an HDMI source using a single LC single-mode fiber optic strand or 1,640 feet (500 meters) using LC multimode fiber optic cable. The local and remote units can be connected together for a point-to-point connection via fiber optic cable or a point-to-many connection via a 10G SFP network switch. Support for multiple transmitters requires a managed 10G SFP network switch.

Features:

• Supports Ultra-HD 4Kx2K resolutions to 3840×2160 and 4096×2160 @60Hz YUV 4:4:4, HDTV resolutions to 1080p @60Hz, and up to 1920×1200 (WUXGA).
• Zero latency.
• Cascade network switches to extend the length longer distances.
• Up to 12 switches can be cascaded.
• HDMI 2.0 and HDCP 2.2 compliant.
• Supports local and remote HDMI displays.
• For a point-to-many connection, a stand-alone network with an unmanaged 10G SFP network switch, hub, or router can be used instead of a managed SFP network switch.
• Up to 255 receivers supported.
• Support for multiple transmitters (many-to-many connection) requires a managed 10G SFP network switch with IGMP support and Jumbo frame support. Standard LAN switches can only support one transmitter.
• Supports full-duplex RS232 up to 115200 baud.
• Bi-directional IR control from input and output locations.
• Supports HDMI-embedded digital audio and ARC audio extraction via Toslink connection.

All the specs are here: https://www.networktechinc.com/4k-hdmi-ip-fiber-extender.html