Power loss in typical office materials

[ctam]

Could you share the loss in typical office materials? e.g. fiber wool ceiling and dry wall, brick wall, concrete wall with metal inside.

Lok

[Rob Huffman · Accepted solution]

Ho Lok,

Signal attenuation or signal loss occurs even as the signal passes through air. The loss of signal strength is more pronounced as the signal passes through different objects. A transmit power of 20 mW is equivalent to 13 dBm. Therefore, if the transmitted power at the entry point of a plasterboard wall is at 13 dBm, the signal strength will be reduced to 10 dBm when exiting that wall.Here some examples;

Plasterboard wall Signal Attenuation 3 dB

Glass wall with metal frame Signal Attenuation 6 dB

Cinder block wall Signal Attenuation 4 dB

Office window Signal Attenuation 3 dB

Metal door Signal Attenuation 6 dB

Metal door in brick wall Signal Attenuation 12 dB

Human body Signal Attenuation 3 dB

From this good site survey doc;

http://www.cisco.com/en/US/products/hw/phones/ps379/products_implementation_design_guide_chapter09186a00802a09e0.html

Hope this helps!

Rob

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