The Apantac OG-SDI-HDTV-RM is the rear-module for the openGear 3.0 card-based SDI to HDMI converter, OG-SDI-HDTV-MB. It auto-detects 3G SDI (1080p - SMPTE-425M level A) HD-SDI (720p, 1080i) or SD-SDI (525,625). The rotary switch allows selecting one of the 8 embedded AES pairs and sends it to the analog stereo audio output.