The 7705 SAR-M has four variants with fixed physical configurations. All variants have seven Ethernet ports:
four SFP Gigabit Ethernet ports (10/100/1000 Mb/s) (ports 1 to 4)
three Gigabit Ethernet RJ-45 ports (10/100/1000 Mb/s) (ports 5 to 7)
Two variants of the 7705 SAR-M also have a module slot.