Hikvision Smart Series 24-ch Gigabit PoE DS-3E1526P-SI24 gigabit PoE ports, and 2 gigabit fiber optical ports. IEEE 802. 3at af standard for PoE ports. Network topology management, alarm push, network health monitor. 6 KV surge protection for PoE ports. AF AT camera can reach up to 300 m in extend mode. PoE watchdog to auto detect and restart the cameras that do not respond. Various layer 2 management protocols such as STP RSTP, VLAN, link aggregation, SNMP, QoS and so on. Smart web managed PoE