The Arista QSFP-40G-XSR4 is a QSFP+ 40GBASE-XSR4 module from Arista Networks for 40 Gbps links. It plugs into a QSFP+ port on an Arista switch and is used for 40G spine and aggregation links, 4 × 10G breakout and data-centre interconnect.

Arista specifies the QSFP-40G-XSR4 for 300 m on OM3 and 400 m on OM4 parallel multimode fiber.

Per Arista's published optics data sheet, the QSFP-40G-XSR4 transmits −7.5 to +1 dBm/lane and receives −9.9 to +2.4 dBm/lane.

The QSFP-40G-XSR4 uses a MPO-12 UPC connector on parallel multimode (OM3/OM4), at 850 nm. Both ends of the link must use the same optical standard.

It works in Arista switches with QSFP+ ports that support this optic. Send us your switch model and EOS version and we will check it against Arista's Transceiver and Cable Guide before dispatch, so you only receive a module that works in your port.

Both are parallel MPO multimode optics. XSR4 reaches 300 m OM3 / 400 m OM4 versus 100/150 m for SR4, for longer runs between halls or floors.

Yes. Arista lists breakout to 4 × 10G-SR. Use the matching optics at the far end and a suitable breakout cable or patch panel.

Yes. Next Gen Networks supplies original Arista Networks optics, not third-party lookalikes or grey-market stock. Every unit is checked before dispatch, and we share the serial numbers on request so you can verify them in EOS ('show inventory').

The Arista QSFP-40G-XSR4 price in India depends on quantity, delivery city and current stock. Next Gen Networks supplies it with a GST invoice (input tax credit ready) and pan-India dispatch from New Delhi. Send the part number, quantity and delivery city on WhatsApp +91-7827955775 or email Sales@nextgennetworks.in and we reply with a GST quote.

Arista lists maximum power of 1.5 W for the QSFP-40G-XSR4. Check your switch's per-port power budget for dense deployments.