Greetings! I stumbled upon this cable and I'm trying to figure out what it's used for, if anyone has any insight I'd greatly appreciate it! Thanks!
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Digging deep into memory here, that rectangular black connector looks like the one used on a consumer Panasonic 7" LCD that was originally meant for car installs. I used to have one on my old Aaton package more than a decade ago. I recall that the Star Trek: Enterprise TV series used them as set dressing monitor displays littered all over the bridge set.
Anyway, that custom ARRI Media cable would be to get power & video to the monitor and the other cable is the original that came with the monitor.
EDIT: Found a picture of one, just for the hell of it. Time has seriously passed this bit of technology by. It's a pretty crap monitor by today's standards.
http://www.digitalimage4k.com/panasonic-7-lcd-monitor/