Dell networking transceiver sfp 1000base sx 850nm wavelength 550m reach quick specs device type sfp mini gbic transceiver module lc multi mode form factor plug in module cabling type 1000base sx data transfer rate 1 gbps data link protocol gigabit ethernet max transfer distance 1640 ft general device type sfp mini gbic transceiver module form factor plug in module networking connectivity technology wired cabling type 1000base sx data link protocol gigabit ethernet