the 10-gigabit ethernet uplink ports operate in full-duplex mode only, and are only on the ws-x4516-10ge and ws-x4013+10ge. these ports use the hot-swappable 10gbase x2 optical transceivers. the x2s have sc connectors to interface with multimode fiber (mmf) and single-mode fiber (smf) cable.

    on a catalyst 4510r with a supervisor engine v-10ge, the user has the option to use either four gigabit ethernet uplinks using sfps or two 10-gigabit ethernet uplinks using x2s. the user also has the option of using the gigabit ethernet and 10-gigabit ethernet uplinks simultaneously. with this option, the tenth slot can only support the ws-x4302-gb switching module. on a catalyst 4507r, the user can use the gigabit ethernet uplinks and 10-gigabit ethernet uplinks simultaneously.

    when two supervisor engine v-10ges are present in a catalyst 4510r or catalyst 4507r switch, or two supervisor engine ii-plus 10ges are present in a catalyst 4507r, one x2 uplink is active on both the primary (active) and secondary (standby) supervisor engines by default, or two uplinks will be active in a nonredundant configuration.