NVIDIA MCA4J80-N005 800Gb/s OSFP Twin-Port Active Copper Cable – 5m InfiniBand NDR ACC

The NVIDIA MCA4J80-N005 is a high-performance 800Gb/s twin-port OSFP Active Copper Cable (ACC) supporting dual 400Gb/s ports from a single 800Gb/s OSFP interface. Designed for InfiniBand NDR and Ethernet Spectrum-4 networks, this 5-meter cable uses 26AWG conductors with integrated equalizer ICs to extend reach while retaining ultra-low latency (passive-like) and just 1.5W maximum power consumption per end. It is part of the NVIDIA MCA4J80 series, offering reliable, cost-effective interconnect for next-generation data centers.

ACC technology combines the robustness of copper with active signal conditioning to achieve 5-meter links without optical transceiver complexity. The MCA4J80-N005 features built-in EEPROM for host system identification, supports hot-pluggable OSFP MSA form factor, and automatically adapts to InfiniBand or Ethernet protocol based on the attached switch.

Unlike passive DAC cables limited to sub-3m lengths at 800G speeds, the MCA4J80 series incorporates a pre-emphasis equalizer IC in each connector shell, effectively extending the reach up to 5 meters while preserving signal integrity. The result is near-zero added latency and a fraction of power compared to optical active optical cables (AOCs). NVIDIA fine-tunes each length to minimize signal noise and back reflections, ensuring robust operation in high-density InfiniBand NDR fabrics. The ACC firmware is protocol-aware and automatically switches between InfiniBand and Ethernet without manual configuration.

This cable is engineered using 30AWG for 3m/4m variants and thicker 26AWG for the 5m (N005) version, lowering insertion loss and meeting strict InfiniBand协会 specifications.

• Connecting NVIDIA Quantum-2 (800Gb/s) switches in spine-leaf topologies up to 5 meters.
• Switch-to-server links: DGX H100 systems to Quantum-2 or Spectrum-4 switches.
• InfiniBand NDR fabrics requiring dense, low-cost, low-power interconnects for AI/ML clusters.
• Ethernet 800GbE to 2x400GbE breakout applications in Spectrum-4 based environments.
• Data center TOR to adjacent racks where optical transceivers are unnecessary.

Engineered for seamless integration within NVIDIA accelerated computing and networking stacks. Supported platforms include:

• NVIDIA Quantum-2 InfiniBand switches (e.g., QM9700 series)
• NVIDIA Spectrum-4 Ethernet switches (SN5000 series)
• NVIDIA DGX H100 / DGX A100 systems with OSFP cages
• Any industry-standard OSFP ports compliant with OSFP MSA supporting 100G-PAM4 (800G/400G)

Hong Kong Starsurge Group provides full lifecycle support including pre-sales consultation, compatibility validation, global shipping, and post-sales technical assistance. Our experienced team works with enterprises, research institutions, and data center operators to deploy NVIDIA networking solutions with confidence. We offer:

• Customized cable length / labeling requests (subject to MOQ).
• FAE (Field Application Engineer) support for large-scale integration.
• Warranty and RMA services aligned with NVIDIA’s product standards.
• BOM consolidation for network hardware — switches, NICs, cables, transceivers.

Founded in 2008, Hong Kong Starsurge Group Co., Limited is a technology-driven supplier of network hardware, IT services, and system integration solutions. We serve global customers with products including network switches, NICs, wireless access points, controllers, high-speed cables, and complementary networking equipment. Our experienced sales and technical teams support government, healthcare, manufacturing, education, finance, and enterprise sectors. Starsurge also delivers IoT solutions, network management systems, custom software development, and multilingual global delivery. With a customer-first philosophy, we provide reliable quality, responsive service, and tailored solutions to build efficient, scalable network infrastructure.

As an authorized partner of leading brands including NVIDIA / Mellanox, Starsurge ensures genuine products with full traceability and fast lead times.

• Confirm switch or server has OSFP cages supporting 800G or 2x400G breakout.
• Check required length: MCA4J80-N005 = 5m; for shorter runs consider N003 or N004.
• Ensure cable bend radius fits rack layout (minimum 89mm near connectors).
• Verify protocol (InfiniBand or Ethernet) — no configuration needed but ensure switch profile matches.
• ESD precautions: trained staff, grounded environment.

• NVIDIA Cable Management Guidelines & FAQ Application Note
• OSFP MSA Specification Rev 1.12 Overview
• InfiniBand NDR Performance Tuning Guide
• FCC Class A & EMC compliance notes for data center installations