Analog audio for Sony PXWX-180 w/ sdi over fiber output

Hi guys, I need to transfer live video output from my PXWX180 https://pro.sony.com/bbsc/ssr/product-PXWX180/, so I use sdi over fiber extenders http://questtel.com/item.php?id=4&product=13, but audio comes as embedded ancillary data, I would need to divide it from video and have it as aux audio, how can I perform it? Any advice is appreciated.
Thanks,