ICX 7550 36-port 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, no fans, no power supplies with exhaust airflow installed. Transceivers sold separately