as figures 2-1 and 2-2 show, the fs726 switch has 24 rj-45 ports, while the fs750 switch has 48 rj-45 ports.these are auto-sensing 10/100 mbps ports: when you insert a cable into an rj-45 port, the switch automatically detects the maximum speed (10 or 100 mbps) and duplex mode (half- or full-duplex) of the attached device, and displays this information using the front panel 100 mbps and fdx leds for that port (leds are described in the next section).the 10/100 mbps ports support only unshielded twisted-pair (utp) cable terminated with an 8-pin rj-45 plug.