All Catalyst 4948 switches share these features:
Dual, hot-swappable power supplies
AC or DC power options
Large, shared packet buffer memory
Very low latency
ToR and Aggregation Switches: Catalyst 4948E Series
Ports:
10/100/1000 Ports : 48
Uplink 1G SFP : 4
Level 3 Features : Basic Level 3
IPv6 Capabilities : Hardware
Power Supply : Dual, hot-swappable