The 7705 SAR-H has a fixed physical configuration that has eight Ethernet ports:
two SFP Gigabit Ethernet ports (10/100/1000 Mb/s) (ports 1 and 2)
two XOR (combination) RJ-45/SFP Gigabit Ethernet ports (10/100/1000 Mb/s) (ports 3 and 4)
four PoE-capable RJ-45 Gigabit Ethernet ports (10/100/1000 Mb/s) (ports 5 to 8)
The 7705 SAR-H also has two module slots.
If a PoE Power Supply is connected, it increases the number of Ethernet ports that can supply PoE to a connected device.