The DSC 3G-HD A and DSC HD-3G A offer several features that enhance and simplify AV system integration. Both scalers feature input equalization which conditions incoming 3G-SDI or HDMI signals to compensate for signal loss over long input cables. The DSC 3G-HD A includes an SDI input loop-through with reclocking to eliminate high frequency jitter. The DSC HD-3G A features a genlock input with loop-through and two simultaneous 3G-SDI/HD-SDI/SDI outputs.
Enhanced audio capabilities for both products include audio embedding, input gain and attenuation controls, and input audio muting. For the DSC 3G-HD A, analog stereo audio, or up to four pairs of AES3 audio channels from the SDI input can be embedded onto the HDMI output. With the DSC HD-3G A, analog stereo audio or HDMI multi-channel PCM audio can be embedded onto the SDI outputs.
All the specs are here: http://www.extron.com/company/article.aspx?id=dsc3ghdaad