The SDI payload identifier for 1.5G-SDI 720p does not contain a field for color space like most color formats. When supplying a 1.5G-SDI 720p signal, the payload identifier can not differentiate between BT.2020 and BT.709 color space. As a result, any 1.5G-SDI 720p input with BT.2020 color space will be identified as BT.709.
NOTE: This is a limitation of the 1.5G-SDI 720p specification and NOT a shortcoming of Videon products.