This product is either discontinued or we cannot get that from suppliers.
TP-LINK TL-SL5428E, 24+4g Gigabit-uplink Fully Managed, Interface 24 10/100Mbps RJ45 Ports, Fanless, Power 100~240VAC, 50/60Hz, Bandwidth/Backplane 12.8Gbps, Forwarding 9.5Mpps, MAC Address Table 8K, Jumbo Frame 2048 Bytes, O/S Microsoft® Windows® 98SE, NT, 2000, XP, Vista™ or Windows 7, MAC® OS, NetWare®, UNIX® or Linux.
Designed for workgroups and departments, TL-SL5428E from TP-LINK provides full set of layer 2 management features. It delivers maximum throughput where you need it — to high-performance workgroups at the edge of the network.