Aruba Q9G82A 40G QSFP+ ER4 40 km SMF Transceiver

Carry 40 Gigabit Ethernet across long single-mode fiber runs with a QSFP+ ER4 optical interface built for links up to 40 km. Aruba Q9G82A uses duplex LC optical connectors, allowing a pair of fiber strands to carry a 40 GbE connection between compatible QSFP+ ports. It suits campus backbones, inter-building connections, metro-edge links, and other installations where copper and short-reach optics cannot cover the required distance. The ER4 designation identifies a long-reach 40 Gigabit Ethernet optical mode for single-mode fiber. Its duplex LC presentation differs from parallel-optics connections that require multi-fiber connectors, helping support environments already cabled with paired LC-terminated single-mode runs. Engineers can use the module to place a 40 GbE uplink on a fiber path while retaining a compact QSFP+ port connection at each endpoint. Match the optic to compatible QSFP+ host ports, duplex LC single-mode patching, and the actual optical-loss budget of the link. The stated 40 km reach makes this module a fit for substantially longer paths than rack, row, or short campus interconnects. Within Aruba 40 Gigabit optical options, its ER4 mode, single-mode medium, duplex LC interface, and 40 km distance capability define its role as a long-reach connection component.