320-2879-PCW is a 1000BASE-LX SFP Transceiver, generic for Dell 320-2879. It is guaranteed compatible for all Dell switch and router product lines. This transceiver can be mixed and deployed with Dell OEM transceivers for seamless network performance and interoperability. PC Wholesale offers a LIFETIME advance replacement warranty on all transceivers (compared to 90 days from most OEM manufacturers).