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.

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.
EN United Kingdom
Choose your country
Livrer en
United Kingdom
Destination de livraison
Panier
Mon Panier
⚑
Chargement...
Nous acceptons
PaymentPaymentPaymentPaymentPaymentPaymentPaymentPaymentPayment
Certification de Sécurité
SecuritySecuritySecuritySecuritySecuritySecuritySecurity
©2018 - 2026 ELFCAM Tous Droits Réservés. Préférences de cookies
Voir le panier Passer la commande