Spare Nlt port means what? Must have 2 fiber termination boxes?
NLT port (Netlink Trust port) = The 2 ports at your Fibre Termnation Point (FTP)
Each of these ports will be activated and connected via a short run of fibre cable to either an ONT or ONR when your sign up with your fibre broadband ISP
The second port of the FTP will be activated and use to connect to your second ONT/ONR (provided by your new ISP) when you sign up for a second fibre broadband with this new ISP
“Spare NLT port” means at least one of your 2 ports must be currently unused (ie you must currently not have more than one fibre broadband ISP)