Cisco WS-X6548-GE-TX. Data transfer rate: 1 Gbit/s, Data link protocols: Ethernet/Fast Ethernet/Gigabit Ethernet, Cabling technology: 10Base-T/100Base-TX/1000Base-TX. Internal memory: 1 MB. Dimensions (WxDxH): 356 x 406 x 30 mm

Designed for premier wiring closets, small campus backbone, and server farm applications, Cisco Express Forwarding 256 10/100 and 10/100/1000 Ethernet-over-copper interface modules provide line-rate 10/100 Ethernet forwarding and gigabit bandwidth options.
This is Catalyst 6500 Series 48-Port 10/100/1000 RJ-45 Cisco Express Forwarding 256 Interface Module; field-upgradable to support Cisco Prestandard PoE daughter card or 802.3af PoE daughter card.