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Arista QSFP-40G-LRL4 40GBASE-LRL4 QSFP+ 1271-1331nm 1 km SMF
40 Gbps 40GBASE-LRL4 QSFP+ transceiver, 1271–1331 nm (4 lambda CWDM), up to 1 km SMF, 0 to 70 °C case temperature.
- Manufacturer
- Arista Networks, Inc.
- Mfr part number
- QSFP-40G-LRL4
- Series
- 40G QSFP+
- Category
- Fiber optic transceiver modules
- Datasheet
- QSFP-40G-LRL4 datasheet (PDF)
QSFP-40G-LRL4 specifications
| Attribute | Value |
|---|---|
| Part Number | QSFP-40G-LRL4 |
| Manufacturer | Arista Networks, Inc. |
| Brand | Arista Networks |
| Standard | 40GBASE-LRL4 |
| Form Factor | QSFP+, hot-swappable |
| Data Rate | 40 Gbps |
| Wavelength | 1271–1331 nm (4 lambda CWDM) |
| Media | Duplex single-mode (G.652) |
| Max Distance | 1 km SMF |
| Connector | Duplex LC |
| Tx Power | −7 to +2.3 dBm/lane |
| Rx Power | −11.5 to +2.3 dBm/lane |
| Max Power | 3.5 W |
| Case Temp | 0 °C to 70 °C |
| Dimensions | 13.5 × 18.4 × 72.4 mm |
| Reach detail | 1 km on duplex single-mode fiber (interoperates with 40GBASE-LR4 up to 1 km) |
All values are from Arista Networks' published Optics Modules and Cables data sheet (Sep 2026). Confirm platform support for your switch with us before ordering.
About the Arista QSFP-40G-LRL4
The Arista QSFP-40G-LRL4 is a hot-swappable QSFP+ 40GBASE-LRL4 optical transceiver for 40 Gbps Ethernet over duplex single-mode (G.652), with a Duplex LC interface and reach of up to 1 km SMF. Typical uses: 40G spine and aggregation links, 4 × 10G breakout and data-centre interconnect.
- 40 Gbps 40GBASE-LRL4 up to 1 km SMF
- Interoperates with 40G-LR4 up to 1 km
- Duplex LC single-mode
- Duplex LC connector · Duplex single-mode (G.652)
- Genuine Arista optic · GST invoice · pan-India dispatch
QSFP-40G-LRL4: frequently asked questions
What is the Arista QSFP-40G-LRL4?
The Arista QSFP-40G-LRL4 is a QSFP+ 40GBASE-LRL4 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.
What is the maximum distance of the QSFP-40G-LRL4?
Arista specifies the QSFP-40G-LRL4 for 1 km on duplex single-mode fiber (interoperates with 40GBASE-LR4 up to 1 km).
What are the transmit and receive power levels of the QSFP-40G-LRL4?
Per Arista's published optics data sheet, the QSFP-40G-LRL4 transmits −7 to +2.3 dBm/lane and receives −11.5 to +2.3 dBm/lane.
Which fiber and connector does the QSFP-40G-LRL4 need?
The QSFP-40G-LRL4 uses a Duplex LC connector on duplex single-mode (G.652), at 1271–1331 nm (4 lambda CWDM). Both ends of the link must use the same optical standard.
Is the QSFP-40G-LRL4 compatible with my Arista switch?
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.
QSFP-40G-LR4 vs QSFP-40G-LRL4: do they work together?
Yes. Arista states optical interoperability between 40GBASE-LR4 and 40GBASE-LRL4 up to 1 km. Use LR4 when you need the full 10 km reach and LRL4 for runs up to 1 km.
Is your QSFP-40G-LRL4 genuine Arista?
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').
What is the QSFP-40G-LRL4 price in India and how do I order?
The Arista QSFP-40G-LRL4 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.
How much power does the QSFP-40G-LRL4 draw?
Arista lists maximum power of 3.5 W for the QSFP-40G-LRL4. Check your switch's per-port power budget for dense deployments.
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Arista family datasheet
Related Arista parts
QSFP-40G-LR440GBASE-LR4, 10 km SMFQSFP-40G-SR440GBASE-SR4, 100 m OM3 / 150 m OM4QSFP-40G-XSR440GBASE-XSR4, 300 m OM3 / 400 m OM4QSFP-40G-SRBD40GBASE-BIDI, 100 m OM3 / 150 m OM4QSFP-40G-SRBD-R40GBASE-BIDI, 100 m OM3 / 150 m OM4QSFP-40G-UNIV40GBASE-UNIV, 150 m MMF / 500 m SMFGovernment, PSU and enterprise orders welcome. GST invoice and pan-India delivery.
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