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QSFP-40G-SR4-AR: Arista 40GBASE-SR4 QSFP+ Optical Transceiver Module

Arista QSFP-40G-SR4-AR Transceiver40GbEQSFP+
AristaTransceivers

Also listed as: QSFP-40G-SR4, QSFP-40G-SR4-C

The Arista QSFP-40G-SR4-AR is a 40GBASE-SR4 QSFP+ optical transceiver providing 40 Gigabit Ethernet connectivity up to 150 meters over OM4 multimode fibre for Arista switches.

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Specifications

Part numberQSFP-40G-SR4-AR
BrandArista
TypeTransceivers
Other numbersQSFP-40G-SR4, QSFP-40G-SR4-C
Statuscurrent
Form factorQSFP+
Speed40GbE
Wavelength nm850
ConnectorMPO-12
Cable typeMultimode Fibre
Max distance m150

About the QSFP-40G-SR4-AR

The Arista QSFP-40G-SR4-AR optical transceiver provides high density 40 Gigabit Ethernet connectivity for data center core spine switches and leaf aggregation networks. Transmitting over four parallel optical lanes at 850 nanometers on multimode fibre, it supports link lengths up to 100 meters on OM3 and 150 meters on OM4 optical cabling.

Compatibility

Compatible with Arista 7050Q, 7050QX, 7060CX, 7280SE, 7280CR, and 7500 Series modular line cards. It supports native 40GbE fabric links as well as channelized 4x10GbE breakout mode configured via standard Arista EOS interface speed commands across enterprise switching platforms.

How to identify a genuine unit

Enclosed in a precision metal QSFP+ casing with a beige or black pull tab release handle. The manufacturer label identifies the part as QSFP-40G-SR4, showing Arista Networks branding, individual serial number barcode, manufacturing code, and optical safety warnings.

Buying used

Inspect the MPO internal optical ferrule face with an MPO inspection scope to ensure no dust or surface scratching on any of the fiber cores. Mount into a live QSFP+ switch port to verify that Arista EOS authenticates all four optical lanes and reports balanced optical power.

Fits these models

Works together

How the Arista QSFP-40G-SR4-AR 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 Arista

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

FAQ

What optical connector is used on QSFP-40G-SR4-AR?

It uses an industry standard 12-fiber female MPO optical connector interface.

Does this transceiver support 4x10GbE breakout mode?

Yes, using an MPO to four duplex LC breakout cable, it supports four 10GBASE-SR connections in EOS.

Buying or selling QSFP-40G-SR4-AR?

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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