All kinds of cage,1x1,2x1,1x4,2x2,2x6 etc,and also SFP connectors

The small form-factor pluggable (SFP) is a compact,”hot-pluggable” optical transceiver used in optical communications for both telecommunication and data communications applications. It interfaces a network device mother board (for a switch, router or similar device) to a fiber optic or unshielded twisted pair networking cable.