Cisco 100GBASE-CWDM4 QSFP28 Transceiver Module, Single-Mode LC

Two kilometers over duplex single-mode fiber is the rating of the Cisco 100GBASE-CWDM4 QSFP28 Transceiver Module, part number QSFP-100G-CWDM4-S. It carries 100GbE on CWDM lanes from 1271 to 1331 nm through a duplex LC connector.

The wide lane spacing keeps the optics simpler than denser multiplexing designs, which is how this class holds its cost down. For buyers, the effect is a single-mode option that reaches across a campus or a large facility, cheaper than the 10 km class and with far greater reach than multimode.

Because it uses duplex LC, you can use standard single-mode patching and trunks. No parallel MPO cabling is required. Confirm that the fiber is single-mode throughout, and measure the actual route length and loss.

The form factor is QSFP28 with one port. Cisco hosts check the optics they accept, so verify that your switch lists this -S part number, and fit a compatible module at the other end of the link.

If your longest link is well under the rating, this module gives comfortable margin. If you need more distance, longer-reach 100GbE modules exist under other part numbers.

The QSFP-100G-CWDM4-S is available 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.