The Cisco Catalyst 6500 48-Port 10/100/1000 Classic Interface Module supports jumbo frames and enhanced QoS capabilities (deeper and more per-port queues). It also supports time-domain-reflectometer (TDR) for rapid cable fault detection.To maximize the performance of your Cisco hardware, Cisco strongly recommends Cisco SMARTnet Support. SMARTnet provides you with technical support, access to essential information, and advanced hardware replacement.