Lexmark 4I3 - Manual (Page 158)

To attach a coaxial cable (not shipped with the printer), follow these
steps:
1. Attach one end of the signal cable to the cable connector at the
rear of the printer.
2. Turn the cable connector clockwise until the cable locks in place.
B e z e l
M od els 2 02 a nd 2 I1
M o d e l 5 I3
C a b le C o n n e c to r
2-18 User’s Guide