This product is either discontinued or we cannot get that from suppliers.
Cisco Catalyst WS-C3850-12X48U-S, Network Ports-48, Port 48 x Gigabit Ethernet Network, Gigabit Ethernet, Twisted Pair, Network 10/100/1000Base-T, Rack-mountable, Compatible Rack Unit 1U.
The Cisco Catalyst 3850 Series is the next generation of enterprise-class stackable Ethernet and Multigigabit Ethernet access and aggregation layer switches that provide full convergence between wired and wireless on a single platform.