Transceiver • SFP28 25G • QSFP+ 40G • QSFP28 100G

QSFP28 100G, QSFP+ 40G & SFP28 25G modules — Compatibility guaranteed

High-density transceivers for Data Centre, HPC and cloud. Every module is custom coded for your equipment (Cisco, Arista, Mellanox, HPE, Juniper…) and factory tested before shipping. Next-day delivery from our France stock.

✓ Compatibility guaranteed or refunded ✓ Factory coded & tested ✓ France stock, next-day shipping ✓ Technical support included
How to choose 100G QSFP28 40G QSFP+
Cisco compatible Arista / Mellanox HPE / Juniper Lifetime warranty
Elfcam QSFP28 100G module — transceiver compatible with Cisco Arista Mellanox
25G / 40G / 100G optical modules — compatible with Nvidia, Mellanox, Arista, Cisco, HPE, Juniper, Marvell.
Contents
How to choose25G SFP2840G QSFP+100G QSFP28FAQ

How to choose your transceiver module?

Enter your parameters to automatically find the module compatible with your equipment.

100% Compatible

Every module is coded specifically for your brand. Compatibility guaranteed or refunded.

Factory tested

Each transceiver is tested individually before shipping: optical power, sensitivity, temperature.

Technical support

Our team helps you choose the right module. Contact us if your configuration is not listed.

25G SFP28 — Servers and high-density NICs

40G QSFP+ — Aggregation and spine-leaf

100G QSFP28 — Data Centre & high-density interconnect

100G cables — AOC & DAC

MPO/MTP cables for 100G SR4

Complete 100G guide: see our 100G Data Centre solution page to choose between QSFP28 SR4, LR4, DAC or AOC based on your infrastructure.

Which switch do these modules plug into?

A QSFP28 module is only useful if there is a port to take it. Our L3 managed Ethernet chassis offer from 2 to 32 100G ports depending on their place in the fabric — access switch or spine.

FAQ — 25G / 40G / 100G transceiver modules

1How to choose between QSFP28 SR4, LR4 and BiDi?
  • SR4 (850nm, MPO): short distance ≤ 100m over OM3/OM4 fibre — intra-rack and inter-rack in server rooms.
  • LR4 (1309nm, LC): long distance up to 10km over OS2 single-mode fibre — inter-building or DCI.
  • BiDi (1291/1311nm): a single fibre for both directions — saves cabling if fibre is already installed.
2What's the difference between DAC, AOC and transceiver + fibre cable?
  • DAC (direct copper): ≤ 5m, cheaper, zero power draw — ideal for intra-rack top-of-rack.
  • AOC (active fibre): up to 100m, lightweight, no separate SFP — long-reach inter-rack.
  • Transceiver + fibre cable: flexible, unlimited distances, individual hot-plug — permanent infrastructure.
3Are your modules compatible with my Cisco / Arista / Mellanox switch?
Yes. Every Elfcam module is custom coded for the brand of your equipment. Use the configurator above or contact us with the exact model of your switch — we verify compatibility before shipping.
4Which fibre to use with a QSFP28 SR4 100G?
The QSFP28 SR4 uses OM3 or OM4 multimode fibre with an MPO/MTP 12-fibre connector. Max distance: 70m on OM3, 100m on OM4. For longer distances, choose the QSFP28 LR4 with OS2 single-mode fibre and LC Duplex connector.
5Can a QSFP28 be used in a QSFP+ slot?
Only if the switch supports "QSFP28 backward compatible" mode. In that case the port operates at 40G. Check your equipment datasheet — some Arista and Mellanox switches accept both, others require a firmware update.
6What is the warranty and delivery time?
All Elfcam modules come with a lifetime warranty. Next business day shipping from our France stock. Free return if the module fails to initialise on your equipment.
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