Cisco 100GBASE-LR4 QSFP28 Transceiver Module, 1310 nm Single-Mode LC

Ten kilometers over a duplex single-mode pair is the reach of the Cisco 100GBASE-LR4 QSFP28 Transceiver Module, part number QSFP-100G-LR4-S. It uses a duplex LC connector, operates around 1310 nm and carries 100GbE.

The module uses CWDM lanes from 1295 to 1309 nm. In plain terms, four wavelengths share one fiber pair, which is why a single duplex connection can carry 100GbE without parallel cabling.

This is a common long-reach choice for campus backbones, links between buildings and metro connections. Standard duplex single-mode patching is enough, so the module suits plants that already have LC trunks in place.

Before ordering, confirm that the fiber is single-mode throughout and measure the loss along the route. Splices, connectors and patch panels use up optical budget. Check that your Cisco switch supports this part number, since hosts check the optics they accept, and fit a compatible module at the far end.

The form factor is QSFP28, with one port.

The QSFP-100G-LR4-S is offered in new, refurbished and used condition. New and refurbished modules carry 1 year or 3 years of warranty, and used modules carry 90 days. Send your quantity and platform when you request pricing.