Cisco WS-X4748-RJ45-E= Catalyst 4500E Series 48-Port 10/100/1000 (RJ-45) Specifications: Catalyst 4500E Series 48-Port 10/100/1000 (RJ-45) 48 ports nonblocking 10/100/1000 module (RJ-45) Cisco IOS XE Release 3.1.0SG or later Energy Efficient Ethernet 802.3az IEEE 802.1AE and Cisco TrustSec capability in hardware L2-4 Jumbo Frame support (up to 9216 bytes) Enterprise and commercial: designed for data only user access Campus and branch applications requiring enhanced performance for large file transfers and network backups