Type : Gigabit Ethernet Layer: Layer 2 Network Ports Qty : 48 x 10Base-T/100Base-TX/1000Base-T - RJ-45 - PoE Connection Speed : 10/100/1000 Additional Interfaces/Slots : 1 x 4 PIN USB Type A, 1 x console - mini-USB Type B, 1 x RS-232 - RJ-45, 1 x 10Base-T/100Base-TX - RJ-45 POE : Yes Manageable : Yes Stackable : Yes Flash Memory : 128 MB RAM Memory :  256 MB