Shopping for the Luxshare LMTQF022-SD-R? This is the equivalent cable we stock.
What you are buying, stated plainly. We ship a compatible QSFP112 passive DAC, part number LMTQF022-SD-R, 0.5 m (50 cm), supplied by Resilient Tec. It is not a genuine Luxshare LMTQF022-SD-R. It is the same specification — QSFP112 passive copper, 400G-rated, both ends — and it does the same job on a DGX Spark.
This is the same cable sold on our NJAAKK-N911 listing. Two listings, one product — you only need one cable to link two units.
→ DGX Spark interconnect reference — approved part numbers, real-world throughput, and what to buy at two, three and four or more nodes.
Part Number: NJAAKK-N911
Cross-references: Luxshare LMTQF022-SD-R · Amphenol NJAAKK-0006
Description: QSFP112 Passive Direct Attach Copper (DAC) cable, 400G-rated, 0.5 m (1.6 ft)
Why the Part Numbers Differ — and Why It Does Not Matter Here
NVIDIA's DGX Spark documentation names approved cables from two manufacturers, across two lengths. They are one specification, not several different products:
| Part Number |
Length |
Manufacturer |
What it is |
| LMTQF022-SD-R |
400 mm (1.3 ft) |
Luxshare |
NVIDIA-listed approved cable — what you searched for, 30AWG |
| NJAAKK-N911 |
400 mm (1.3 ft) |
Amphenol |
NVIDIA-listed approved cable — Amphenol's short version, 32AWG |
| NJAAKK-0006 · NJAAKK0006 · SF-NJAAKK0006-000.5M |
0.5 m (1.6 ft) |
Amphenol |
NVIDIA-listed approved cable — the 0.5 m version |
| NJAAKKR-0006 |
0.5 m (1.6 ft) |
compatible market |
A compatible-market spelling of the 0.5 m part |
A compatible QSFP112 passive DAC from a reputable source meets the same electrical specification and works normally in DGX Spark and GB10 systems — but it is not the OEM part, and we would rather say so on the page than have you find out when it arrives.
If you specifically need a genuine Luxshare LMTQF022-SD-R — because a spec sheet, a support contract or a procurement rule calls for that exact part — send us a quote request. We will source it rather than substitute, and we will tell you the lead time up front.
Technical Specifications
| Specification |
Value |
| Part Number |
NJAAKK-N911 |
| Supplied by |
Resilient Tec (compatible build) |
| Cross-references |
Luxshare LMTQF022-SD-R · Amphenol NJAAKK-0006 |
| Interface |
QSFP112 |
| Cable Rating |
400G-rated (4 x 100G lanes) |
| Link speed on DGX Spark / GB10 systems |
Up to 200 Gb/s per port (port-capped by NVIDIA spec) |
| Cable Type |
Passive Direct Attach Copper (DAC) |
| Length |
0.5 m (50 cm / 1.6 ft) |
| Connector Type |
QSFP112 on both ends |
| Port Used |
ConnectX-7 QSFP port |
| NVIDIA approval status |
Compatible equivalent to the NVIDIA-listed approved cables (Luxshare LMTQF022-SD-R, Amphenol NJAAKK-N911 / NJAAKK-0006) |
How It Is Used
On the NVIDIA DGX Spark — and on the OEM GB10 systems built on the same reference platform (HP ZGX Nano AI Station, Dell Pro Max with GB10, ASUS Ascent GX10) — you plug this cable into the system's ConnectX-7 QSFP ports to link units directly, with no switch required. Per NVIDIA's DGX Spark documentation, each of these QSFP ports operates at up to 200 Gb/s, so the link runs at 200 Gb/s even though the cable itself is QSFP112 / 400G-rated. There is no separate "dedicated stacking port" — the ConnectX-7 QSFP ports are used both for connecting units together and for standard Ethernet / RoCE networking.
The MCP1650-V00AE30 (200G QSFP56 DAC) is not a part NVIDIA names, but it is a viable, tried-and-tested lower-cost 200G option that our customers have used successfully to stack these systems, with no reported issues.
How Many Cables Do You Need?
| Nodes |
Topology |
Switch |
Cables |
| 2 |
Point to point |
No |
1 × this cable |
| 3 |
Ring (both ports per node) |
No |
3 × this cable |
| 4 |
Ring, custom NCCL — not NVIDIA-supported |
No |
4 × this cable. In a rack, wire it folded (1→2→4→3→1) so no cable spans more than two units and 0.5 m reaches. |
| 4+ |
Through a 400G switch |
Yes |
One 200G QSFP56 DAC per node, or an MCP7H60 breakout on the switch side |
Good to Know
-
Up to four units connect without a switch. Two Sparks take one cable. Three take three cables in a ring, using both QSFP ports on every unit — the configuration NVIDIA documents. Four can also run switchless as a ring of four cables using a custom NCCL build; owners are running it today, but it is outside NVIDIA support and cannot grow past four. A switch is the supported route at four nodes and the only route beyond. How the four-node switchless ring works
- Connects units directly — no switch, transceivers, or adapters required
- 0.5 m is ideal for two compact desktop units placed side by side
- Works across the GB10 ecosystem (NVIDIA DGX Spark, HP ZGX Nano AI Station, Dell Pro Max with GB10, ASUS Ascent GX10), which share the same ConnectX-7 networking
- The ConnectX-7 QSFP ports operate in Ethernet mode (with RoCE), not InfiniBand
- Passive copper — no transceivers, no power draw, no firmware
Related Guides
NJAAKK-N911 vs NJAAKK-0006 vs LMTQF022-SD-R: What's the Difference?
NVIDIA DGX Spark Stacking Cable: What It Does and How It Compares to the DAC
How to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why
Can You Build a 4-Node DGX Spark Cluster Without a Switch? The Ring That Works and the Breakout Trick That Doesn't
COMPATIBILITY DOCUMENTATION
Download compatibility report: LMTQF022-SD-R_Compatibility_Report
Guide includes: compatibility notes for NVIDIA DGX Spark and OEM GB10 platforms, ConnectX-7 200GbE port verification, dual-system interconnect setup instructions.
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Same cable, also listed as NJAAKK-N911. Lower-cost 200G alternative: MCP1650-V00AE30 200G QSFP56 DAC.
