From Blackmagic Design:
Workgroup Videohub automatically switches between standard definition SDI and high definition SDI with full 12x24 routing. With 12 extra independent SDI monitoring outputs allowing separate monitoring direct from the router. Also included are 12 RS-422 deck control ports with two channels in internal processing for HD down conversion, and a keying frame store. Configuration via software control panels over a TCP/IP network. Feature upgrades and local control via USB.