TN-GLC-BX-U-40-PCW is a 1000BASE-BX-U Bi-Directional SFP Transceiver, generic for Transition Networks TN-GLC-BX-U-40. It is guaranteed compatible for all Transition Networks switch and router product lines. This transceiver can be mixed and deployed with Transition Networks 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).