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Networking Fundamentals · Intermediate

10GBASE-SR

10 Gbps Ethernet over multimode fiber using 850 nm light, reaching 300 m on OM3 and 400 m on OM4.

Definition

10GBASE-SR is the most common 10G fiber interface inside data centers and building risers, usually as an SFP+ module with duplex LC connectors. It uses a VCSEL laser source.

Example

Two racks are connected with 10GBASE-SR SFP+ modules and an OM4 LC-LC patch cable.

Exam tip

SR = short reach multimode; OM3 gives 300 m.

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