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February 1, 2026
DAS/Indoor Wireless
Every discussion of cell signal strength involves dB and dBm, but what do these measurements actually mean? Whether you’re troubleshooting poor reception or planning a signal amplifier installation, understanding these units is crucial. Here’s a straightforward explanation of the difference between dB and dBm, and why they matter for your overall cellular connectivity.
What Is a dB?
The abbreviation dB refers to decibels. A decibel reading signifies the amount of increase or decrease in a signal.
Decibels are helpful for determining the amount of signal strength produced by a DAS system and how much signal will be produced by the system once it’s installed.
What is dBm?
The abbreviation dBm stands for decibel milliwatts. It refers to the amount of power that an antenna or amplifier is able to produce, or how much signal is present at a site.
Higher Means Stronger: The Power of Logarithmic Scales
It’s easy to underestimate how strong a signal is when you’re looking at a decibel reading. Both dB and dBm are logarithmic, not linear. This means the way most of us think about magnitude doesn’t apply.
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