Probel vistek V1601 (snell) 1RU V1601 19inch rack unit, NOw are Snell wilcoxV1601 rack frame datasheet http://products.3d-av.com/avcat/images/documents/other/PI-A4-Vistek-V1601.pdf installed with 1x power supply3x SDI monitoring cards, 2x are SDI input, 3 SDI out and 5x composite outputs