OSI Model Made Easy - Layer 1 - Physical

The animated TECHTip Tutorial is available here.

Layer 1 - Physical connects wires/wireless

This is the physical layer which is considered to be the “railroad track” and consists of equipment such as wiring, connectors and add-on boards that are necessary for sending data across the network. Here are some of the key elements in layer one.

• Interconnects physical elements

• Defines signals - radio, optical, electrical
• Defines physical shapes - jacks, connectors

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