Review on 🔌 2Pack 1.25G SFP Transceiver 1000BASE-LX, 1310nm Single-Mode Fiber Module, up to 10km Range, Compatible with Cisco GLC-LH-SMD, Ubiquiti, Netgear, D-Link, Supermicro, Mikrotik by David Reyes

I used them in QNAP QSW-408 and no-name Intel 82599. They worked in both without problems. VERY IMPORTANT: They are designed to be used with single mode LCLC cables. Using a multimode cable can work (ymmv) but is not optimal. Although they are called LR (Long Range), they can be used on both short and long cables if the cable is single mode. and can be controlled by LED-based sfp(+) optics. Yellow cables are typically single mode with a 9 micron core and must be driven by a laser with a wavelength of at least 1310 nm. Due to the high signal frequency and the reduced surface area of the 9 micron cable, single-mode connections can be covered from a few meters to many kilometers. Multimode is much more limited.