PHYSICAL LAYER
Layer 1 in the OSI Reference Model, this layer sends bits along the media, and involves the signalling and physical topology. This layer, along with Layers 2 and 3, forms the Transport or Network Service.
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Layer 1 in the OSI Reference Model, this layer sends bits along the media, and involves the signalling and physical topology. This layer, along with Layers 2 and 3, forms the Transport or Network Service.
More: Physical Layer