We need to connect two sites via single-mode fiber that's already in place. Network traffic will be minimal. We're looking at a pair of HP 2510 switches (part J9279A).
My question is related to the fiber modules. Two part numbers are given:
HP X112 100M SFP LC BX-D Transceiver (J9099B)
HP X112 100M SFP LC BX-U Transceiver (J9100B)
I'm not familiar with the concept of upstream/downstream when it comes to SFP modules. Reading the part descriptions it mentions using a single strand of fiber; I'm guessing this is the reason for the upstream/downstream parts?
I figured we would need one of each part number but wanted some expert feedback.