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Networking Fundamentals · Intermediate

Quad Small Form-Factor Pluggable (QSFP)

A larger hot-swappable module with four lanes, used for 40G (QSFP+), 100G (QSFP28) and, in QSFP-DD and OSFP forms, 400G and 800G.

Definition

QSFP modules can run as one aggregate link or, with breakout cables, as four independent lower-speed links. QSFP-DD doubles the lane count for 400G and 800G in high-density data center and AI fabrics.

Example

A QSFP28 port is split into four 25G links with a breakout cable.

Exam tip

Quad = four lanes.

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