Amphenol SF-NJAAKK0006-000.5M 0.5m (1.6') 400G QSFP112 DAC Cable - 400-Gigabit Ethernet Passive Direct Attach QSFP-112G-PAM4 Cable (32-AWG) - QSFP112 DGX Spark Stacking Cable (OEM PN: NJAAKK-0006)

Buy Amphenol 0.5m (1.6') 400G QSFP112 Cables Now for your DGX Spark Stacking Needs!  Our 400GBASE-CR4 802.3by/802.3bs qualified passive direct attach copper (DAC) cables provide next generation performance by combining four SFP112 channels, each operating at speeds of up to 100.0 Gbps (PAM4-112G), into one affordable standard-sized 38-position QSFP connector package (QSFP112); capable of combined speeds in excess of 400.0 Gigabits per second.

The Amphenol Cables on Demand 32 AWG SF-NJAAKK0006-000.5M 400G QSFP112 DAC Cable is 100% identical to the Amphenol NJAAKK-0006 QSFP112 DAC Cable and will also directly substitute for the 30 AWG NJAAKKR-0006. 

Our SF-NJAAKK0006-000.5M cable functions as the 0.5m (1.6ft) length equivalent to the Amphenol-built NJAAKK-N911 0.4m QSFP112 DAC Cable and per the NVIDIA Developers Forum, offers the same capacity as the NJAAKK-N911 for interconnecting (stacking) two or three NVIDIA DGX Spark AI desktop computer systems via one of its native 400G QSFP (ConnectX-7) rated ports.

Note that a limitation to the bus speed of the DGX Spark only permits any 400G-rated stacking cables to run at half-speed (200G).  This is because the Sparks use ConnectX-7 certified QSFP ports, which always require 400G QSFP112 rated cables, regardless of whether the Spark platform can actually utilize the full 400G I/O bandwidth. This is why slower 200G-rated QSFP56 DAC Cables will NOT work reliably as a substitute -- they're detected as non-ConnectX-7 compliant cables by the Spark firmware.

Our QSFP112 cables integrate a new 400G Ethernet-optimized (400GbE) 38-position “board-as-connector” design with zinc die-cast backshells for superior EMI resistance, minimal insertion loss, and improved cross-talk performance. Featuring our exclusive Amphenol Spectra-Strip SKEWCLEAR® EXD Extended Distance Series 8-pair wire technology optimized for 112G/lane applications including 400-Gigabit Ethernet (400GBASE-CR4) and 400G InfiniBand.

SKEWCLEAR EXD wire allows for use of a lighter and more flexible 32 AWG conductor while maintaining a smooth high-frequency response (20 GHz) superior to our competitors' 30 AWG equivalent. Each 0.5m (1.6-ft) length QSFP112 cable goes through a rigorous assembly and test procedure aimed at eliminating unnecessary signal loss. Our cables are fully compliant to the QSFP112 MSA for guaranteed compatibility with all QSFP112 ports and reverse compatibility with QSFP+ / QSFP28 / QSFP56 ports.