PHY SNR Margin

In Emergent Vision cameras, the PHY SNR Margin feature reveals Ethernet PHY signal-to-noise headroom, ensuring robust, error-free links for high-speed imaging.

Positive values above +3 dB indicate a healthy link, while readings below +3 dB may precede packet loss. The feature appears only on Eros HE-T (RJ-45 Base-T) models.

PHYSNRMargin node

• Access mode: Read Only
• Node type: Int32
• Range: –200 … +200 (raw units = 0.1 dB; e.g., 127 → 12.7 dB)
• Typical values:
  
  • 4–13 dB (raw 40–130) Normal for 1–100 meters Cat-6/6A links
  • 3 dB (raw 30) Edge of spec (100 meters limit)
  • < 3 dB Risk of dropped packets, so shorten or upgrade cabling

You can use the eSDK API functions to get the node’s value.

For more information about related features, see Device Information Features.