QDD-4X100G-LR-S Cisco Compatible 400G QSFP-DD LR 10km SMF Transceiver

Decoded, the name reads as a spec line — 400G, QSFP-DD, LR class, 10km over single-mode fiber, duplex LC in front — and the QDD-4X100G-LR-S is the Cisco-compatible module answering that exact description. Coding for Cisco platforms is preloaded, so the host reads a recognized 400G module at insertion and DDM/DOM diagnostics come up with the port.

• Form Factor: QSFP-DD
• Data Rate: 400G
• Protocol: LR
• Fiber Type: SMF
• Reach: 10km
• Connector: Duplex LC
• OEM Equivalent: QDD-4X100G-LR-S

Compatibility: Documented OEM compatibility (Cisco published compatibility documentation): this module is accepted in 400G QSFP-DD ports on the ASR 9000 Series, Catalyst 9500 Series, Catalyst 9600 Series, Cisco 8000 Series, NCS 540 Series, NCS 5500 Series, Nexus 3000 Series, Nexus 9300 Series, Nexus 9500 Series, and Nexus 9800 Series. This module follows Cisco's published compatibility matrix; for your exact line card or OS release, email 10.4@tenfouroptics.com and we'll confirm fit.

Tested & Proven: Every TenFour Optics part is coded, tested, and verified before shipment — see Tested & Proven.

MSA-conformant behavior is verified during outgoing test, per unit, covering coding, diagnostics, and optical output. At 10km over SMF it reaches well past what shorter-reach 400G optics handle while staying in the same QSFP-DD slot, and the designation match to the Cisco listing keeps configuration references intact. Backed by the GreenLights4Life® Limited Lifetime Replacement Warranty. In-stock items ship same or next business day — contact 10.4@tenfouroptics.com to confirm availability and lead time.