I don't understand what you are saying.
If he has already a 12V LPS, he can buy a switch with a SFP port. They have a built-in FMC, and most of them work with 12V.
It's a more simple solution than to buy a FMC + a new 5V LPS.
Confusing the guy with switches isn’t going to help but ok.
2 FMCs and 1 5v LPS is all he needs.
We got it so well documented here that anyone can understand it. $200 and he is gold.
Oh nice. Well there ya go.The ones I used and posted about at an incredible €31 including 10m of optical cable (and two smps PSU's) accept 5-12v.