📡 How to Choose the Right AOC Connector? A Single Chart Explains the Differences Between SFP+, QSFP28, and QSFP56
Active optical cables (AOCs) are becoming increasingly common in data center cabling and server interconnections. However, many people struggle to distinguish between the SFP+, QSFP28, and QSFP56 connectors and are unsure which one is the best choice.
⚡ Key Differences Between Versions
QSFP56 uses PAM4 modulation, doubling the data rate, and requires OM4/OM5 fiber and new DSP chips.
QSFP28 currently offers the best value for money and supports breakout splitting (1 port to 4 x 25G).
SFP+ is simple and affordable, suitable for 10GbE environments, with nearly negligible power consumption.
✅ Selection Recommendations (Just Follow These Guidelines)
🖥️ 10G data centers / storage networks → Choose SFP+ AOC
🏢 100G top-of-rack (TOR) or aggregation layer → Choose QSFP28 AOC
🚀 New 200G clusters / 400G evolution → Choose QSFP56 AOC
🔀 Mixed equipment environments → Use adapter branch cables + verify compatibility
📌 One-Sentence Summary
SFP+ holds the 10G throne, QSFP28 dominates 100G, and QSFP56 leads the way for 200G.
Simply match your switch speed and projected bandwidth needs for the next 2–3 years to the appropriate option.
For more detailed information, please read the article: AOC Cable Interface Classification
