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Optics Transceivers | SFP Modules
DAC/AOC/AEC Cables
40G DAC/AOC

40G DAC/AOC

Shop LINK-PP compatible 40G QSFP+ DAC cables for leaf/spine and aggregation interconnects. This store groups MSA-aligned 40G QSFP+ to QSFP+ passive copper direct-attach assemblies—typically 0.5 m to 3 m—coded for Cisco, Arista, Juniper, Dell, NVIDIA/Mellanox, and other platforms. Return to the parent DAC/AOC hub for 10G/100G/400G cables, pair with 40G QSFP+ optics when you need longer optical reaches, or open a Cisco compatible PN. Confirm QSFP+ cage compatibility, length, and OEM coding on each product page before ordering.

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Frequently asked questions

01.Which 40G cable types does this category cover?
This store lists LINK-PP 40G QSFP+ to QSFP+ passive DAC twinax cables for short-reach 40 Gigabit Ethernet links. Use on-page filters to narrow by length and brand. For AOCs or other rates, return to the parent DAC/AOC hub.
02.How long can a passive 40G QSFP+ DAC run?
Passive 40G QSFP+ DACs are commonly offered from about 0.5 m to 3 m (some platforms qualify up to ~5 m). Same-rack and adjacent-rack spine/leaf jumps usually use 1–3 m. Beyond copper reach, switch to 40G QSFP+ SR4/LR4 optics plus fiber.
03.Can I break out 40G QSFP+ to 4×10G with a DAC?
Some platforms support 40G to 4×10G breakout with a QSFP+ to 4×SFP+ breakout DAC when the switch port is in breakout mode. Confirm host CLI support and SFP+ coding on each leg. Straight QSFP+-to-QSFP+ DACs in this store do not fan out by themselves—use a breakout SKU or 40G optics with an MPO-to-LC harness.
04.Are these 40G DACs coded for Cisco, Arista, Juniper, and NVIDIA?
Yes—select the Compatible PN for your OEM (for example Cisco QSFP-H40G-CUxM, Arista CAB-Q-Q-xM, Juniper EX-QSFP-40GE-DAC-xM, or NVIDIA/Mellanox MC22xxxx). LINK-PP assemblies are EEPROM-coded for host recognition. Browse the Cisco compatible hub when the switch cable PN is already known.
05.QSFP+ DAC vs 40G SR4 optic—which should I buy?
Choose a QSFP+ DAC for lowest cost and power on short copper links inside a rack or between adjacent racks. Choose a 40GBASE-SR4 (or LR4) pluggable from the 40G QSFP+ store when you need longer MMF/SMF reach, structured fiber, or DOM monitoring. Do not plug a QSFP28 100G DAC into a native 40G-only QSFP+ port unless the platform documents interoperability.

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