Which 10G SFP+ PMD matches my distance?
The series spans a 30m copper direction through 300m and 400m on multimode to 10km, 20km, 40km and 80km on single-mode. SR covers in-hall links, LR covers 10km, and ER or ZR directions extend the span. Beyond about 40km the loss and dispersion budget matters more than the reach label.