J9150D is an Aruba 10G SFP+ LC SR 300m MMF XCVR.
JL255A has 24x 10/100/1000 PoE+ ports and 4x 1000/10G SFP+ transceiver slots for high speed connectivity. PoE+ is supported with a power budget of 370 Watts.
This JL557A has 48x 10/100/1000 PoE+ ports and 4x 1000/100 SFP transceiver slots for uplink connectivity. PoE+ is supported with a power budget of 740 Watts. The Aruba 2930F Switch Series is designed for customer creating digital workplaces optimized for mobile users.