Standard: the switch functions as a common unmanaged switch and all the ports of the switch can communicate with each other.
CCTV: the port cache is optimized and PoE ports 1-8 have higher priorities over the other ports. All the ports of the switch can communicate with each other.
VLAN: ports 1 to 14 are isolated from each other, but can communicate with ports 15 and 16 (uplink ports) respectively.
Isolation：ports 1 to 14 and ports 15 to 24 belong to two different VLAN. This mode can be used to isolate supervision network and wireless network to make them not interfere with each other.
