Description

Farsince 400G QSFP‑DD to 2×QSFP56 AOC is a factory‑terminated multimode fiber harness that breaks out a single QSFP‑DD interface on the host side to two independent QSFP56 optical ends on the device side. The assembly carries eight 50G PAM4 lanes at 850 nm on the QSFP‑DD side and maps them into two groups of 4×50G for dual 200G SR4 links. It plugs directly into QSFP‑DD cages on switches or accelerator servers and connects to QSFP56 ports on TOR switches, NICs or storage, enabling efficient 400G‑to‑200G fan‑out in leaf‑spine, AI/HPC and large‑scale data center fabrics.

The lightweight optical design reduces cable bulk and eliminates EMI concerns common to copper breakouts, while pull‑tab latches and hot‑swap mechanics support fast service in dense racks. Power draw is under 10 W from a 3.3 V supply, with monitoring via CMIS 4.0 over I2C. Standard lengths from 1 to 50 meters support short‑reach deployments. Farsince offers customization for overall and leg lengths, labeling/serialization and project kitting to streamline rollouts and maintenance.

Specifications

• Product Type: QSFP‑DD to 2×QSFP56 Active Optical Cable (AOC)
• Cable Direction: QSFP‑DD (host) to dual QSFP56 (devices)
• Data Rate: 400 Gb/s aggregate; each leg 200 Gb/s (4×50G PAM4)
• Electrical Interface: 400GAUI‑8
• Wavelength: 850 nm VCSEL/PIN optics
• Cable Structure: SR8 to dual SR4 multimode fiber harness
• Cable Length: 1–50 m options
• Supply Voltage: 3.3 V
• Power Consumption: ≤10 W per cable
• Operating Temperature: 0–70°C
• Management: CMIS 4.0 over I2C
• Application: Breakout of 400G ports to two 200G switch/NIC links
• Compatibility: QSFP‑DD MSA hosts and QSFP56 SR4 ports
• Compliance: RoHS, REACH
• Customization: Lengths, leg split, labeling/ID, deployment kits