40G QSFP+ ESR4 Transceiver QSFP-40G-ESR4
40GBASE-eSR4 · 850nm · Multimode (MMF) · MPO · 300m
40GBASE-SR4 · 850nm · Multimode (MMF) · MPO · 100m
Compatible with major switch brands — share your equipment model to confirm coding before ordering. 3-year warranty included.
The 40GBASE-SR4 QSFP+ transceiver delivers 40 Gbps over multimode fiber (MMF) through an MPO interface, up to 100 m. It is hot-pluggable, QSFP+ MSA-compliant, and supports DDM digital diagnostics.
40G QSFP+ remains a cost-effective aggregation layer: ToR-to-spine uplinks, 40G server adapters and legacy 40G switch ports. SR4 and eSR4 use MPO ribbon fiber at 100–300 m; IR4, LR4 and ER4 use LC duplex single-mode up to 40 km.
MPO links are polarity-sensitive: confirm the MPO polarity and fiber count match your patch panel before installation, and clean both end faces. Share your switch model and port type so we confirm the coding for your equipment; every module ships with a 3-year warranty and free technical support.
| Model / Part Number | QSFP-40G-SR4 |
|---|---|
| Ethernet Standard | 40GBASE-SR4 |
| Data Rate | 40G |
| Wavelength | 850 nm |
| Fiber Type | Multimode (MMF) |
| Connector | MPO |
| Max Reach | 100m |
| Form Factor | QSFP+ |
| DDM support | Yes |
40GBASE-eSR4 · 850nm · Multimode (MMF) · MPO · 300m
40GBASE-IR4 · 1310nm · Single-mode (SMF) · Duplex LC · 2km
40GBASE-LR4 · 1310nm · Single-mode (SMF) · Duplex LC · 10km · see note
40GBASE-ER4 · 1310nm · Single-mode (SMF) · Duplex LC · 40km · see note