"NEW" Cisco 10-3659-01 QSFP-100G-FR-W2 100G-FR 2KM SMF QSFP28 Transceiver Module For Sale
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Benefit:Interoperates with 400G transceivers (which also use PAM4) and offers better efficiency, paving the way for 400G upgrades, according toCisco's documentation.
Distance:Still supports 2km over Single-Mode Fiber (SMF) with a duplex LC connector, just like the original FR, notesProvantage.
In essence: The-W2version is the updated, future-proofed FR transceiver from Cisco, designed to align with the PAM4 standard prevalent in 400G optics, making it a better choice for new deployments than the older-W(or-S) version, which is based on older PAM2 tech, according tothe Airheads Community.