This product is either discontinued or we cannot get that from suppliers.
Tp-link T1600G-52TS(TL-SG2452), Protocols IEEE 802.3i,IEEE 802.3u,IEEE 802.3ab, IEEE802.3z,IEEE 802.3x,IEEE 802.1d, IEEE 802.1s,IEEE 802.1w,IEEE 802.1q,IEEE 802.1p, Interface 48 10/100/1000Mbps RJ45 Ports, (Auto Negotiation/Auto MDI/MDIX) ,4 Gigabit SFP Slots, Power Supply 100~240VAC, 50/60Hz, Rack Mountable, Max Power Consumption 32.8W (220V/50Hz), Max Heat Dissipation 111.91 BTU/h, Jumbo Frame 9216 Bytes, MAC Address Table 16K.
TP-LINK JetStream Gigabit Smart Switch T1600G-52TS is a cost-effective product solution for small and medium-sized business which provides high performance, powerful L2 and L2+ features like static routing, enterprise-level QoS and useful security strategies.