Understanding SNR (Signal-to-Noise Ratio) in Your Modem

Signal vs. Noise

Think of your internet connection like a conversation in a room. Signal is the voice of the person speaking to you. Noise is the background chatter.

The Magic Numbers

For cable internet (DOCSIS):

• SNR > 40dB: Excellent. Crystal clear signal.
• SNR 35dB - 40dB: Good. Standard for most homes.
• SNR < 33dB: Trouble. Expect random disconnects and packet loss.

How to Check

Most modems have a status page at 192.168.100.1. Login and look for the SNR or Rx power columns. If your numbers are low, check for loose coax cables or unnecessary splitters in your house wiring.