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NVIDIA Mellanox T-40G-QSFP-L-LR4 40GBASE-LR4 QSFP+ 1310nm 10 km SMF
40 Gbps (4 × 10G) 40GBASE-LR4 QSFP+ transceiver, 1310 nm, up to 10 km SMF, Ethernet.
- Manufacturer
- NVIDIA Corporation (Mellanox)
- Mfr part number
- T-40G-QSFP-L-LR4
- Series
- LinkX 40G QSFP+
- Category
- Fiber optic transceiver modules
- Datasheet
- T-40G-QSFP-L-LR4 datasheet (PDF)
T-40G-QSFP-L-LR4 specifications
| Attribute | Value |
|---|---|
| Part Number | T-40G-QSFP-L-LR4 |
| Manufacturer | NVIDIA Corporation (Mellanox Technologies) |
| Brand | NVIDIA Mellanox |
| Standard | 40GBASE-LR4 |
| Form Factor | QSFP+, hot-swappable |
| Data Rate | 40 Gbps (4 × 10G) |
| Protocol | Ethernet |
| Wavelength | 1310 nm (CWDM, 4 lanes) |
| Media | Single-mode fiber (OS2) |
| Max Distance | 10 km SMF |
| Connector | Duplex LC |
| Lifecycle | Legacy / end-of-life (stock on request) |
| Case Temp | 0 °C to 70 °C (commercial) |
| Dimensions | 8.5 × 18.4 × 72.4 mm |
| Compliance | IEEE 802.3 / IBTA, SFF-8436/8636 |
| Reach detail | up to 10 km on single-mode fiber |
| Ordering note | Cumulus Express part (Mellanox OPN 40G-QSFP-L-LR4). Ask us for a current NVIDIA or OEM-compatible equivalent. |
| Part-number note | Cumulus Express part |
Values are from NVIDIA's LinkX product pages, ordering tables and firmware 'validated and supported cables and modules' lists (Oct 2026). Confirm platform and firmware support for your switch or adapter with us before ordering.
About the NVIDIA Mellanox T-40G-QSFP-L-LR4
The NVIDIA Mellanox T-40G-QSFP-L-LR4 is a hot-swappable QSFP+ 40GBASE-LR4 optical transceiver for 40 Gbps Ethernet links over single-mode fiber, with a Duplex LC interface and reach of up to 10 km SMF. It is a Cumulus Express transceiver that NVIDIA sold with Cumulus Linux white-box switch bundles; the family is now end-of-life (NVIDIA LCR-000637). Typical uses: 40GbE and FDR10 spine, aggregation and HPC cluster links, plus 4 × 10G breakout.
- 40 Gbps 40GBASE-LR4 up to 10 km SMF
- Cumulus Express 40GbE QSFP+ LR4
- 1310 nm, Duplex LC
- Duplex LC connector · Single-mode fiber
- Genuine NVIDIA Mellanox part · GST invoice · pan-India dispatch
T-40G-QSFP-L-LR4: frequently asked questions
What is the NVIDIA Mellanox T-40G-QSFP-L-LR4?
The T-40G-QSFP-L-LR4 is a QSFP+ 40GBASE-LR4 module from NVIDIA's LinkX range for 40 Gbps Ethernet links. It plugs into a QSFP+ (or QSFP28 set to 40G) port on an NVIDIA / Mellanox switch, adapter or DPU and is used for 40GbE and FDR10 spine, aggregation and HPC cluster links, plus 4 × 10G breakout.
What is the maximum distance of the T-40G-QSFP-L-LR4?
NVIDIA specifies the T-40G-QSFP-L-LR4 for up to 10 km on single-mode fiber.
Which fiber and connector does the T-40G-QSFP-L-LR4 need?
The T-40G-QSFP-L-LR4 uses a Duplex LC connector on single-mode fiber (OS2), at 1310 nm (CWDM, 4 lanes). Both ends of the link must use the same optical standard.
Is the T-40G-QSFP-L-LR4 compatible with my NVIDIA / Mellanox switch or adapter?
It works in NVIDIA and Mellanox platforms with QSFP+ (or QSFP28 set to 40G) ports that list this part in their firmware 'validated and supported cables and modules' table. Send us your switch / adapter model and firmware version and we check it against NVIDIA's support list before dispatch, so you only receive a module that links up in your port.
Is the T-40G-QSFP-L-LR4 still available?
NVIDIA has marked the T-40G-QSFP-L-LR4 legacy / end-of-life, so it is no longer in regular production. Next Gen Networks sources genuine new and surplus stock on request. Cumulus Express part (Mellanox OPN 40G-QSFP-L-LR4). Ask us for a current NVIDIA or OEM-compatible equivalent. Tell us the quantity and we will confirm availability, or suggest the current NVIDIA equivalent.
Is your T-40G-QSFP-L-LR4 genuine NVIDIA / Mellanox?
Yes. Next Gen Networks supplies original NVIDIA (Mellanox) LinkX parts, not third-party lookalikes or grey-market stock. Every unit is checked before dispatch and we share serial numbers on request so you can verify them with mlxlink / mlxcables or the switch's transceiver inventory.
What is the T-40G-QSFP-L-LR4 price in India and how do I order?
The NVIDIA Mellanox T-40G-QSFP-L-LR4 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.
Documents
NextGen datasheetPDF · specs, FAQ & buying guideDownload datasheet
Mellanox_T-40G-QSFP-L-LR4_Datasheet_NextGenNetworks.pdfNVIDIA LinkX documentation
Manufacturer product pages
Related NVIDIA Mellanox parts
T-40G-QSFP-M-SR440GBASE-SR4, 100 m OM3 / 150 m OM4MC2210411-SR440GBASE-SR4 / InfiniBand FDR10, 100 m OM3MC2210411-SR4L40GBASE-SR4, 30 m OM3MC2210411-SR4E40GBASE-SR4, 300 m OM3/OM4MC2210511-LR440GBASE-LR4 / InfiniBand FDR10, 10 km SMFMMA1B00-B150D40GBASE-SR4, 150 m OM4AI / HPC cluster, government, PSU and enterprise orders welcome. GST invoice and pan-India delivery.
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