The Decklink SDI 4K Capture & Playback Card from Blackmagic Design features a single multi-rate SDI input and multi-rate SDI output. These multi-rate connections accept single-link SD, HD, 3G, and 6G-SDI signals, providing support for resolutions from SD to Ultra HD 4K (3840 x 2160) and DCI 4K (4096 x 2160). Additionally, the Decklink SDI 4K includes RS-422 deck control, internal keying, and a reference input.