Cisco 40GBASE-LR4 QSFP+ Transceiver Module, 1310 nm Single-Mode LC

Forty gigabit Ethernet over a standard duplex single-mode pair, for up to 10 km, is what the Cisco 40GBASE-LR4 QSFP+ Transceiver Module, part number QSFP-40G-LR4, is built to do. It operates at 1310 nm and uses a duplex LC connector.

The module also supports the OTU3 data rate. That makes it relevant to links that connect into optical transport equipment as well as straight switch-to-switch connections. Whether your transport gear needs that mode is a question for its documentation.

Ten kilometers covers campus backbones and short metro connections. Because the connector is LC, normal duplex single-mode patching applies, with no parallel MPO cabling involved. The fiber must be single-mode from end to end, and the real loss on the route, including splices and patch panels, should be measured against the optical budget.

The form factor is QSFP+, so the module fits 40GbE cages and not SFP+ ports. Cisco hosts check the optics they accept, so verify support on your switch. The far end needs a compatible 40GBASE-LR4 module.

The QSFP-40G-LR4 is offered new and refurbished, each with a choice of 1 year or 3 years of warranty. No used offer is listed. Send your quantity and platform for pricing.