The LS-S2309TP-SI-AC is a basic layer 2 access switch with 8 FastEthernet ports, 1 Gigabit Ethernet port, and an AC power supply. It provides functions such as VLAN, QoS, IPv6, port mirroring, and basic security. Compared to the similar LS-S2309TP-EI-AC model, it has fewer advanced features and only supports AC power. The LS-S2309TP-SI-AC is suitable for small networks that require basic switching and connectivity.