Reference
Form factors
Per-form-factor technical reference, MSA refs, electrical interface, power draw, FEC requirements, supported reach classes, switch platforms in production, and example SKUs.
SFP1G
SFP
The Gigabit workhorse. Campus access, branch uplinks, legacy refreshes.
Full specs
SFP+10G
SFP+
The 10G workhorse, server access, building backbones, branch core.
Full specs
SFP2825G
SFP28
25G server access, the current default for new server NICs.
Full specs
QSFP+40G
QSFP+
40G aggregation, four parallel 10G lanes in one cage.
Full specs
QSFP28100G
QSFP28
The current 100G data-center fabric standard.
Full specs
QSFP56200G
QSFP56
200G PAM4, four lanes at 50G each, mostly seen in HPC and storage.
Full specs
QSFP-DD400G
QSFP-DD
Double-density 400G, backward-compatible cage, eight electrical lanes.
Full specs
OSFP800G
OSFP
The 800G workhorse, eight lanes of 100G PAM4 for AI/ML and hyperscale.
Full specs