The 7705 SAR-Hc has a fixed physical configuration that has six Ethernet ports:
two SFP Gigabit Ethernet ports (10/100/1000 Mb/s) (ports 1 and 2)
two Gigabit Ethernet RJ-45 ports (10/100/1000 Mb/s) (ports 3 and 4)
two PoE-capable RJ-45 Gigabit Ethernet ports (10/100/1000 Mb/s) (ports 5 and 6)