ICX 7550 36-port 10/100/1000/2500 Mbps 802.3bt POE, 12-port 100/1000/2500/50000/10000 Mbps 802.3bt POE with 2-ports 40/100 Gbps Uplink/Stack QSFP28, module slot, three fans, two AC power supplies  with exhaust airflow  installed.  Transceivers sold seperately