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School/Analyse/Layers/1. Physical Layer.md
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@ -119,4 +119,10 @@ This is also called signal to noise ratio (SNR)
## Transmission Media
These signals are send through a transmission medium. A transmission medium is a physical object that can carry the information from source to destination.
Transmission mediums are often space (air), metallic cable or fibv
Transmission mediums are often space (air), metallic cable or fiber optic cables.
Transmission media are divided in 2 groups.
### Guided media
### Unguided media