Product Guide
10G to 800G: Choosing SFP+, SFP28, QSFP56, QSFP-DD, OSFP Transceivers
Published July 20, 2026
A practical decision tree for switch-side transceiver selection. Match lane count, modulation, and form factor to your reach and power budget.
Form factor by lane bandwidth
Every pluggable transceiver is a number of electrical lanes × the bandwidth per lane:
SFP+ — 1 lane × 10 G NRZ → 10 G aggregate.
SFP28 — 1 lane × 25 G NRZ → 25 G aggregate.
QSFP56 — 4 lanes × 50 G PAM4 → 200 G aggregate.
QSFP-DD — 8 lanes × 50 G PAM4 → 400 G; mechanically backward-compatible
with QSFP+ and QSFP28 ports.
OSFP — 8 lanes × 100 G PAM4 → 800 G; a slightly larger cage than
QSFP-DD with built-in heat-sink anchoring for the higher power envelope.
Reach class: SR, DR, FR, LR, ER, ZR
Reach is encoded in the model code suffix. For 400 G QSFP-DD as an example:
Code | Fiber | Reach | Typical use |
|---|---|---|---|
DR4 | 4× single-mode duplex MPO | 500 m | Datacenter spine-leaf |
FR4 | duplex LC single-mode | 2 km | Pod-to-pod within DC |
LR4 | duplex LC single-mode | 10 km | DCI-short |
LR8 | duplex LC single-mode | 10 km | LR4 alternative |
ZR/ZR+ | duplex LC single-mode | 80–120 km | Coherent DWDM metro |
Power and cooling
A 400 G QSFP-DD ZR runs at 15–18 W. Switches certified for 400 G ZR usually cap at ~16 W per port due to airflow constraints. Always confirm the switch vendor's per-port power budget before committing to ZR optics on every port — many deployments mix ZR-on-uplink and FR4-on-fabric to fit under the per-line-card thermal envelope.
DOM and compatibility coding
Optiunik transceivers ship pre-coded for the major switch OS vendors (Cisco, Arista, Juniper, Mellanox/NVIDIA, HPE, Dell, H3C). Specify the target platform when ordering — re-coding after delivery requires the module to be physically returned.
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