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The DECrepeater 90T is a 9-port repeater with eight Unshielded Twisted Pair (UTP) 10baseT ports and one 10base2 port.
The 90T+ is exactly the same as the 90T except that it supports sheilded twisted pair (STP) in addition to unshielded twisted pair. The 90T only supports Unshielded twisted pair (UTP).
The DECrepeater 90T-16 is a sixteen port 10baseT repeater. It also contains an additional 10base2 port on its side. It essentially seems to be the same as the DECrepeater 90T except slightly newer and with an additional eight ports. All ports are Shielded Twisted Pair.