AJA FS2 is a Dual Channel Universal 3G/HD/SD Audio/Video Frame Sync/Converter, 1RU.

FS2 can be used as two separate Frame Synchronizers/Format Converters, or the two channels can be linked with the internal FS2 keyer to do the work of three or more devices - for example HD sidebar keying where both the video and background graphics are up-converted and combined.
AJA's powerful hardware conversion technology ensures the highest image quality for your productions. Key conversion features include:
SD/HD up/down-conversion
SD/SD aspect ratio conversion
HD/HD cross-conversion (720p/1080i)
Up/down/cross-conversion with both the input and converted formats on SD/HD SDI outputs (both synchronized)
HD cross-conversion with simultaneous down-converted SDI output
FS2 can up or down-convert between SD, HD, and 3G HD (1080p50/60), and cross-convert between HD formats including 3G HD. Additionally, FS2 has full input and output signal routing, allowing any I/O port to be assigned to either processing channel.