Power up to 24 Network Jacks and IntelliJack™ Switches over standard Category 5 or 5e Ethernet cabling.
3com POWER OVER ETHERNET MIDSPAN, 802.3 Ethernet/Fast Ethernet LAN with Category 5/5e cabling , 24 RJ-45 connectors
3com POWER OVER ETHERNET MIDSPAN. Recommended Macintosh system requirements: 802.3 Ethernet/Fast Ethernet LAN with Category 5/5e cabling . I/O ports: 24 RJ-45 connectors