The MediaCento IPX Multicast system transmits up to 328 feet (100 meters) per link, but goes even longer with additional network switches added to the mix, and because it is based on standardized Ethernet protocols, you can even use media converters and run several miles over fiber optic cabling. Plus, it transmits signals digitally from end to end, so digital content is never compromised, and is HDCP compliant for streaming Blu-ray content.
Black Box offers three different versions depending on the application: MediaCento IPX Multicast Video Wall Transmitters and Receivers (VX-HDMI-IP-VTX, VX-HDMI-TP-VRX), MediaCento IPX Multicast Transmitters and Receivers (VX-HDMI-IP-MTX, VX-HDMI-IP-MRX) and MediaCento IPX Unicast Transmitters and Receivers for point-to-point IP streaming (VX-HDMI-IP-UTX, VX-HDMI-IP-URX).
The video wall version of the multicast extender supports 2×2, 3×3, 4×4 and 8×8 screen arrays.
You can see all the specs here.