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QSFP-40G-SR4: Cisco 40GBASE-SR4 QSFP+ Optical Transceiver

Cisco QSFP-40G-SR4 Transceiver40GbEQSFP+
CiscoTransceivers

Also listed as: 10-2672-02, QSFP-40G-SR4=

The Cisco QSFP-40G-SR4 is a 40GBASE-SR4 QSFP+ optical transceiver supporting 40 Gigabit Ethernet links over multimode fibre with MPO-12 connectors up to 150 meters.

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Specifications

Part numberQSFP-40G-SR4
BrandCisco
TypeTransceivers
Other numbers10-2672-02, QSFP-40G-SR4=
Statuscurrent
Form factorQSFP+
Speed40GbE
Wavelength nm850
ConnectorMPO-12
Cable typeMultimode Fibre
Max distance m150

About the QSFP-40G-SR4

The Cisco QSFP-40G-SR4 optical transceiver provides high bandwidth 40 Gigabit Ethernet links across parallel multimode optical ribbons. It incorporates four independent transmit and receive channels operating at 10 Gigabits per second per lane over 850 nanometer wavelengths. It reaches distances up to 100 meters over OM3 cabling and 150 meters over OM4 multimode fibre cabling.

Compatibility

Compatible with Cisco Nexus 9000, Nexus 3000, Nexus 5600, Nexus 6000, and Catalyst 9500 Series switches equipped with native 40GbE QSFP+ ports. It supports both dedicated 40 Gigabit inter-switch uplinks and 4x10GbE breakout cabling configurations connecting directly to server and storage adapters.

How to identify a genuine unit

Features a full size QSFP+ metal casing with a beige or orange pull tab release mechanism for high density port insertions. The chassis label carries the Cisco trademark logo, product designation QSFP-40G-SR4, assembly part number 10-2672-02, and optical laser safety classification markers.

Buying used

Inspect the multi-fiber MPO-12 interface with an optical fiberscope to confirm that all 12 fiber ferrule end faces are free from oil, dust, and physical chipping. Confirm that the spring loaded release tab clicks properly into the port cage and that switch monitoring logs report normal laser bias currents.

Fits these models

Works together

How the Cisco QSFP-40G-SR4 connects to servers, storage and the network: 3 ways, with the hardware on each path.

iSCSI and NVMe/TCP over EthernetFile storage (NFS and SMB)Hyperconverged cluster

iSCSI and NVMe/TCP over Ethernet

Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.

Adapters for the server

Switches

Storage

iSCSI and NVMe/TCP over Ethernet: how it fits together

File storage (NFS and SMB)

Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.

Adapters for the server

Switches

Storage

File storage (NFS and SMB): how it fits together

Hyperconverged cluster

Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.

HCI nodes

Adapters for the server

Switches

Hyperconverged cluster: how it fits together

Plan and size it

Check compatibility with Cisco

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Cisco has tested with the Cisco QSFP-40G-SR4.

FAQ

What connector does the QSFP-40G-SR4 transceiver use?

It uses an industry standard multi-fiber push-on MPO-12 optical connector interface.

Can the QSFP-40G-SR4 operate in 4x10G breakout mode?

Yes, it supports optical breakout to four separate 10GBASE-SR SFP+ ports using MPO to 4x LC breakout cables.

Buying or selling QSFP-40G-SR4?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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