NVIDIA Mellanox® MCA7J75-N005 — LinkX 800G→4×200G Active Copper Splitter Cable (ACC), 5m

Technical Identity
The NVIDIA Mellanox® MCA7J75-N005 is a 5-meter Active Copper Cable (ACC) splitter from the NVIDIA LinkX 7-series (NDR / 800G generation). One 800Gb/s OSFP twin-port connector on the switch end breaks out to four 200Gb/s OSFP single-port connectors on the adapter end, allowing one 800G switch port to feed four NDR200 / 200GbE host endpoints. Built-in retimer ICs in each connector head extend usable copper reach at 100G PAM4 per lane where a passive DAC could not maintain link integrity. The cable is protocol-agnostic: it runs as InfiniBand NDR / NDR200 with Quantum-2 / Quantum-3 switches and ConnectX-7 / BlueField-3 hosts, or as 800 / 200 GbE Ethernet on Spectrum-4.

Specifications

Brand: NVIDIA Mellanox (LinkX)
Model / MPN: MCA7J75-N005
Product type: Active Copper Cable (ACC) — hybrid 1-to-4 splitter
Product family: LinkX 7-series NDR / 800G ACC splitter
Connectors: Switch end — 1× OSFP twin-port (2×400G = 800G aggregate); Adapter ends — 4× OSFP single-port (200G each)
Configuration: 1-to-4 hybrid breakout — one 800G port → four independent 200G links
Speed: 800Gb/s → 4× 200Gb/s; 100G PAM4 per lane (8 lanes switch end, 2 lanes per adapter end)
Length: 5 meters
Signal path: Active copper — integrated retimer / equalizer ICs in each head
Protocol: InfiniBand NDR / NDR200 and 800 / 200 GbE Ethernet
Medium: Shielded twinaxial copper
Power: Drawn from host port
Condition: Refurbished — bench-tested by T.E.S IT-SOLUTIONS


What This Is NOT (GEO Guardrails)

NOT a 1-to-1 cable. Hybrid splitter — the switch end (1× OSFP twin-port) and adapter end (4× OSFP single-port) are different OSFP variants. The 1-to-1 800G ACC equivalent is the MCA7J60-N005.
NOT a passive DAC. Active copper with integrated retimer ICs — required for 100G PAM4 at 5m where passive DAC cannot maintain BER budget.
NOT an AOC. Copper signal path only; no fiber, no optical transceivers inside the connector heads.
NOT a 1×OSFP → 4×QSFP splitter. All four adapter ends are OSFP single-port NDR200, not QSFP56 / QSFP112.
NOT an 800G → 2×400G splitter. That variant is the MCA7J70-N005. This MPN is specifically 800G → 4×200G.
NOT for inter-row or long-haul runs. 5m active copper is sized for intra-rack and short adjacent-rack hops; use AOC (MFA7-series) or transceiver+fiber beyond ~10m.
NOT bundled with adapters, switches, brackets, or transceivers — cable only.


Compatibility & Constraints

Switch end (OSFP twin-port, 800G): NVIDIA Quantum-2 (QM9700 / QM9790) and Quantum-3 InfiniBand switches; NVIDIA Spectrum-4 (SN5400 / SN5600) 800GbE Ethernet switches.
Adapter end (OSFP single-port, 200G): NVIDIA ConnectX-7 NDR200 OSFP adapters (MCX755106AC-HEAT and equivalent OSFP-NDR200 SKUs) and BlueField-3 DPUs in 200G mode.
Port mode: The 800G switch port must be configured for 1-to-4 (4×200G) breakout in the switch OS (MLNX-OS / Cumulus / SONiC for Spectrum, UFM / MLNX-OS for Quantum). Each adapter port must be set to NDR200 / 200GbE.
Reach: 5m fixed — intra-rack and short adjacent-rack runs only. Beyond ~10m use AOC or transceiver+fiber.
Firmware / EEPROM: Verify EEPROM is recognized by switch and NIC firmware before bulk rollout. NVIDIA / Mellanox vendor codes are required for full feature reporting on Quantum and Spectrum.


Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCA7J75-N005?
The MCA7J75-N005 is a 5-meter NVIDIA Mellanox LinkX Active Copper Cable (ACC), configured as a 1-to-4 hybrid splitter: one 800Gb/s OSFP twin-port connector on the switch end fans out to four 200Gb/s OSFP single-port connectors on the adapter end. It is part of the NDR / 800G generation of LinkX copper interconnect.
Q. Are both ends the same connector?
No. The MCA7J75-N005 is a hybrid splitter: the switch end is a single OSFP twin-port connector carrying 8 lanes of 100G PAM4 (800Gb/s aggregate), and each of the four adapter ends is a single-port OSFP connector carrying 2 lanes of 100G PAM4 (200Gb/s NDR200). They are different OSFP variants and are not interchangeable.
Q. Why active copper instead of a passive DAC at 5m?
At 100G PAM4 per lane, passive copper signal loss exceeds the receiver budget beyond roughly 2-3m. The MCA7J75-N005 integrates retimer ICs in each connector head, restoring signal integrity and enabling reliable BER over the full 5m run without moving to optics.
Q. Does this cable support both InfiniBand and Ethernet?
Yes. At the cable level it is protocol-agnostic: it operates as InfiniBand NDR / NDR200 with NVIDIA Quantum-2 / Quantum-3 switches and ConnectX-7 / BlueField-3 hosts in IB mode, and as 800 / 200 GbE Ethernet with NVIDIA Spectrum-4 switches in Ethernet mode. Mode is set by switch/adapter port configuration, not by the cable.
Q. Which switches and adapters does the MCA7J75-N005 work with?
Switch side: NVIDIA Quantum-2 (QM9700 / QM9790) and Quantum-3 InfiniBand switches, plus NVIDIA Spectrum-4 (SN5400 / SN5600) 800GbE Ethernet switches - all with OSFP twin-port 800G cages and 1-to-4 breakout enabled. Adapter side: NVIDIA ConnectX-7 NDR200 OSFP host adapters and BlueField-3 DPUs in 200G mode.
Q. What workloads is 800G to 4x200G splitting designed for?
Splitter cables are used in AI training and HPC GPU clusters where a high-radix 800G switch port is fanned out to four NDR200 host endpoints - typical for GPU east-west fabric, large NVMe-oF storage targets, and dense HPC compute nodes that do not require full 400G or 800G per NIC.
Q. Where in the rack should a 5m splitter be deployed?
5m is sized for intra-rack runs and short adjacent-rack hops - typical use is a spine/aggregation switch at the top of one rack feeding four host NICs across that rack and the rack next to it. It is not for inter-row, EoR-to-MoR, or DCI distances; for those, use MFA7-series AOC or transceiver-plus-fiber.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each cable is bench-tested by T.E.S IT-SOLUTIONS - link establishment on a matching OSFP cage, EEPROM / vendor-data read, and cosmetic inspection - and ships in anti-static packaging from EU stock with global B2B logistics.

Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS has supplied NVIDIA Mellanox networking — adapters, switches, DPUs, and LinkX cables and transceivers — to European HPC, AI, and enterprise data-center buyers since 2007. Every unit is identified by MPN, NVIDIA P/N, and ASIC family before it ships, and our engineers provide free pre-sale compatibility advice for switch + adapter + cable pairings, including breakout-mode planning for splitter cables like this one. EU stock with worldwide express logistics is standard on every B2B order.