the gigabit ethernet uplink ports operate in full-duplex mode only. gbics have sc connectors to interface with multimode fiber (mmf) and single-mode fiber (smf) cable. for more information about gbics, refer to the catalyst 4500 series module installation guide.

    when two supervisor engine vs are present in a catalyst 4507r and catalyst 4510r, all four uplinks are active on both primary (active) and secondary (standby) supervisor engines by default, or two uplinks will be active in a nonredundant configuration. this limits access to slot 10 on the catalyst 4510r to ports 3 and 4 only. you can only use the 2-port gigabit ethernet switching module (ws-x4302-gb) or the access gateway module (ws-x4604-gwy) in slot 10 (flex-slot), when a supervisor engine v is used.