Arista 25GB Transceivers - SFP28 - Refurbished, Used, New

Best Selling

Arista 25G SFP28 transceivers are the pluggable optics that put 25 Gigabit Ethernet on the SFP28 ports of Arista 7050X3, 7060X, 7280R and similar switches, and on 25G server adapters. They are used for top-of-rack server links, leaf uplinks in spine and leaf designs, and 25G links between buildings over single-mode fiber. The SFP28 cage is the same size as SFP+, so one switch port can run 10G or 25G depending on the optic you plug in. NetworkTigers sells Arista SFP-25G-SR, SFP-25G-LR and SFP-25G-MR-XSR optics refurbished, used and new. Every transceiver is tested before it ships so it links up when it arrives.

Arista 25G SFP28 optics by reach

Part	Reach, fiber and connector	Shop
SFP-25G-SR	25GBASE-SR short reach, 850 nm, multimode fiber, duplex LC. Roughly 70 m on OM3 and 100 m on OM4. The standard choice inside a row or a data hall.	SFP-25G-SR
SFP-25G-MR-XSR	Extended short reach, 850 nm, multimode fiber, duplex LC. Reaches farther than the standard SR optic on the same OM3 or OM4 fiber; listings show the rated distance.	SFP-25G-MR-XSR
SFP-25G-LR	25GBASE-LR long reach, 1310 nm, single-mode fiber, duplex LC, up to 10 km. For campus and inter-building links.	SFP-25G-LR
Dual-rate 10G/25G	The SFP-25G-MR-XSR runs at 10G or 25G, so it can link a 25G switch port to a 10G device over multimode fiber and move to 25G later.	SFP-25G-MR-XSR
All Arista 25G SFP28 optics	Every SR, XSR and LR listing on the page, refurbished, used and new	SFP-25G
Related Arista optics	Other Arista pluggables and cables	All Arista optics \| 10G SFP+ \| 100G QSFP28 \| DAC cables

Which Arista 25G SFP28 do I need?

Fiber type first. Orange or aqua multimode fiber (OM3, OM4) takes SR or XSR. Yellow single-mode fiber takes LR. An SR optic will not light a single-mode run, and an LR optic on multimode fiber is not a supported link.
Distance second. Within a rack or a row, SR is enough. Past about 70 m on OM3 or 100 m on OM4, or when you have a long patch path through several panels, step up to XSR. Anything over a few hundred meters needs LR on single-mode fiber.
Match both ends. Use the same optic type at each end of the link. 25G links also need matching FEC settings on both switches; longer multimode runs at 25G normally require RS-FEC.
Mixed 10G and 25G. If one end is still 10G, the SFP-25G-MR-XSR negotiates down to 10G. A plain SR or LR optic is 25G only.
Breakouts. To fan a 100G QSFP28 port out to four 25G SFP28 links, you need a 4x25G breakout optic or cable on the 100G side and one of these optics at each 25G end.

Frequently asked questions

Do these optics work in an Arista 10G SFP+ port?
No. A 25G optic needs an SFP28 port. The cages look identical, but a 10G port cannot drive a 25G-only optic. The dual-rate SFP-25G-MR-XSR is the exception and runs at 10G in a supported SFP+ port.

Will an Arista-coded 25G optic work in a non-Arista switch?
Often yes, since the optics follow the SFP28 MSA, but some vendors restrict third-party coding. Tell us the switch model and we will confirm before you order.

How is a used transceiver tested?
Each optic is inserted in a live switch, checked for link at its rated speed, and its DOM readings (temperature, voltage, transmit and receive power) are reviewed before it is packed.

NetworkTigers has sold enterprise network equipment since 1996. Every transceiver carries the NetworkTigers 365-day warranty. Need a quantity? Ask us for a quote.