Technology
Understanding Mobile Signal Strength: Why –81 dBm Is Good (and Why It’s Negative)
Understanding Mobile Signal Strength: Why –81 dBm Is Good (and Why It’s Negative) When checking mobile network diagnostics on a phone, LTE router, or modem, you may encounter signal readings such as: Signal strength: –81 dBm (57 ASU) At first glance, this can be confusing—especially the negative number.