physical level

OSI level

Also known as: physical layer

Learn about this topic in these articles:

In computer science: Networking and communication
…of the protocol lies the physical layer, containing rules for the transport of bits across a physical link. The data-link layer handles standard-sized “packets” of data and adds reliability in the form of error detection and flow control bits. The network and transport layers break messages into the standard-size packets…
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In telecommunications network: Data transfer
The physical layer is the transmission medium itself, along with various electric and mechanical specifications.
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