Cisco WS-X6148A-RJ-45 : Catalyst 6500 48-Port 10/100 w/TDR, Upgradable - PoE 802.3af

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 (part number WS-X6548-GE-TX) provide line-rate 10/100 Ethernet forwarding and gigabit bandwidth options. (Refer to Table 4).
The PoE Cisco Express Forwarding 256 10/100/1000 interface modules provide flexible 10-, 100-, and 1000-Mbps access to the desktop through standard RJ-45 connectors. These interface modules feature PoE field-installable daughter cards for pay-as-you-grow investment protection and flexibility. Purposefully designed for the wiring closet with 8:1 oversubscription, these 10/100/1000 interface modules cannot be equipped with distributed forwarding cards.
Offered with a choice of RJ-45 and RJ-21 connectors, the data-only Cisco Express Forwarding 256 10/100 and 16-port 10/100/1000 Ethernet interface modules can be deployed where PoE capability is not required, and they can be equipped with distributed forwarding daughter cards for higher-performance local packet-forwarding environments.