InfiniBand DAC & AOC Cables
Passive DAC, active copper and AOC InfiniBand cables. In-rack and rack-to-rack links, breakout options, compatibility-verified supply.
Cabling is the most overlooked component of a fabric and one of the highest entries in failure statistics. A cable set chosen in the right type and the right length noticeably reduces both installation time and the instability that shows up after commissioning.
Passive DAC cables are the most economical and lowest-latency option at short distances; active optical cables (AOC) take over for long runs and in high electromagnetic noise. Breakout variants split one high-speed port into multiple links so that spine ports are used efficiently.
Mevasis produces the cable list per link from your rack layout plan, and labelling and cable management materials appear in the same quote.
How to choose
Distance: measure the cable path first
Passive copper (DAC) cables only work over short distances, and at high speed tiers that limit drops to a few metres. Measure the actual route rather than the straight-line distance — the vertical drop inside the rack, the cable tray and the bend allowance usually push the total beyond what you expect.
The balance between DAC, ACC and AOC
DAC is the cheapest option and draws almost no power; it is the default for leaf links inside the same rack. Active copper (ACC) covers the middle distance. AOC, being optical, wins over long runs and in electrically noisy environments, but costs more per unit.
Port efficiency through breakout
Breakout cables that split one high-speed port into two or four lower-speed links are the most practical way to use spine ports efficiently. Using them requires port-splitting configuration on the switch, which is done during commissioning.
Bend radius and cable management
High-speed copper cables are thick and relatively stiff; going below the minimum bend radius degrades signal integrity. In dense installations, cable management hardware and correct length selection directly affect both airflow and failure rates.
Products 2
NVIDIA
400G InfiniBand HDR Active Optical Cable (AOC) Family
1–30 m (OSFP / QSFP112) and 1–100 m (QSFP-DD) length rangesTakes over where copper cable runs out of distance30 mm minimum bend radius — an advantage in tight channels
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Price on request
NVIDIA
800G OSFP InfiniBand NDR Copper Cable Family
Only 0.1 W per end on passive DAC — practically zero next to an optical module0.5–3 m passive, 1–5 m active variantsFinned (switch) and flat-top (adapter) housing options
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Price on requestFrequently Asked Questions
If the distance is within the limit, choose DAC: it is cheaper, draws less power and needs no optical modules. Once you exceed the limit, or the route passes through a noisy environment, move to AOC. Share your rack layout and we will work out which link gets which type.
We build a per-link length list from the rack layout and port plan. We take care not to over-specify length, because excess cable creates unmanageable coils inside the rack and airflow problems.
Yes. For production clusters we recommend at least one spare of every length and type; waiting on lead time after a cable failure usually takes out an entire rack rather than a single node.
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