Home › Parts › Arista part numbers

QSFP-100G-CWDM4-AR: Arista 100GBASE-CWDM4 QSFP28 Optical Transceiver Module

Arista QSFP-100G-CWDM4-AR Transceiver100GbEQSFP28
AristaTransceivers

Also listed as: QSFP-100G-CWDM4, QSFP-100G-CWDM4-C

The Arista QSFP-100G-CWDM4-AR is a 100GBASE-CWDM4 QSFP28 optical transceiver delivering 100 Gigabit Ethernet up to 2 kilometers over single mode fibre for data center fabrics.

Buy QSFP-100G-CWDM4-ARSell yours

Specifications

Part numberQSFP-100G-CWDM4-AR
BrandArista
TypeTransceivers
Other numbersQSFP-100G-CWDM4, QSFP-100G-CWDM4-C
Statuscurrent
Form factorQSFP28
Speed100GbE
Wavelength nm1,310
ConnectorLC duplex
Cable typeSingle Mode Fibre
Max distance m2,000

About the QSFP-100G-CWDM4-AR

The Arista QSFP-100G-CWDM4-AR optical transceiver provides power efficient 100 Gigabit Ethernet connectivity for intermediate reach data center spine leaf architectures. It operates across four CWDM optical wavelengths at 1271, 1291, 1311, and 1331 nanometers over standard duplex single mode fibre up to 2 kilometers between data center halls.

Compatibility

Compatible with Arista 7050CX3, 7060CX, 7260CX3, 7280CR, and 7500R Series switches. Requires host system forward error correction to guarantee bit error rate thresholds. Plugs natively into QSFP28 switch ports and interfaces cleanly with enterprise optical distribution frames.

How to identify a genuine unit

Enclosed in a metal QSFP28 housing with a green pull tab designating CWDM4 optical technology. The Arista manufacturer label states part designation QSFP-100G-CWDM4, serial number barcode, engineering revision code, and laser safety class compliance markings.

Buying used

Inspect the duplex optical port for physical contaminants or scratch marks on internal lens optics. Verify that the switch platform firmware authenticates the module and provides accurate optical diagnostic metrics across all four CWDM receiver wavelength lanes.

Fits these models

Works together

How the Arista QSFP-100G-CWDM4-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-100G-CWDM4-AR.

FAQ

What is the maximum link distance for QSFP-100G-CWDM4-AR?

It supports links up to 2 kilometers over standard single mode fibre with host RS-FEC enabled.

What optical wavelengths are used by CWDM4?

It utilizes four optical wavelength channels at 1271, 1291, 1311, and 1331 nanometers.

Buying or selling QSFP-100G-CWDM4-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.

Buy QSFP-100G-CWDM4-ARSell yours

Sources