Copper or fiber
JL6107-PC and JL6107-PI list no optical port. JL6107S-PC, JL6107S-PI, JL6107SC-PC and JL6107SC-PI list 1000BASE-X with a 3.3 V (1.1 V) supply, against 1.1 V for the copper parts. The selector shows no other difference between S and SC parts.