The LT443D-GLA Genlock Module has an external reference loop through and a 3-system independent black signal generator. External analog reference inputs can be NTSC/PAL black burst, 14 formats of HDTV tri-level sync or 525p/625p sync. It can also accept black burst with a 10 field ID as per SMPTE 318M. Output sync signals can be generated in 3-systems, as above, with independent timing. Both genlock and black sync timing have a 5 frame settable range for NTSC/PAL black burst and HDTV analog tri-level sync signal inputs.