Swap-compatible with the Arista QDD-400G-LR8, the module matches it on the two counts that decide the link: a 400G rate and a 10km single-mode reach, delivered from the standard QSFP-DD footprint through a duplex LC. Host coding is written at the factory, so an Arista switch identifies the LR8 optic it expects and brings the port up clean, and DDM/DOM keeps optical levels in front of the platform the whole time.
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Form Factor: QSFP-DD
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Data Rate: 400G
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Protocol: LR8
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Fiber Type: SMF
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Reach: 10km
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Connector: Duplex LC
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OEM Equivalent: QDD-400G-LR8
Compatibility: Documented OEM compatibility (Arista published compatibility documentation): this module is accepted in 400G QSFP-DD ports on the 7050X4 Series, 7060X4 Series, 7060X5 Series, 7280R3 Series, 7368X4 Series, and 7800R3 Series. This module follows Arista'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.
Because it drops in one-for-one, the sparing plan and the existing link design carry over untouched. It is manufactured against the applicable MSA and each serial is exercised on the bench before packing. Coverage is 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.
