DB loss and real world examples.
| Signal Strength |
Description |
Required for |
| -30 dBm |
Max achievable signal strength. The
client can only be a few feet from the AP to achieve this. Not typical or
desirable in the real world. |
N/A |
| -67 dBm |
Minimum signal strength for
applications that require very reliable, timely packet delivery. |
VoIP/VoWiFi, streaming video |
| -70 dBm |
Minimum signal strength for reliable
packet delivery. |
Email, web |
| -80 dBm |
Minimum signal strength for basic
connectivity. Packet delivery may be unreliable. |
N/A |
| -90 dBm |
Approaching or drowning in the noise
floor. Any functionality is highly unlikely. |
N/A |
Chart listing some materials and approximate DB loss when transmitting through them.
| Material |
DB loss |
| Plasterboard
wall |
3dB |
| Glass wall
with metal frame |
6dB |
| Cinder block wall |
4dB |
| Office window |
3dB |
| Metal door |
6dB |
| Metal door in
brick wall |
12.4dB |
References:
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