physical layer
Sign in to saveAlso known as OSI layer 1, layer 1
the lowest-level electronic or optical transmission functions of a network
Wikidata facts
- Part of
- OSI model
- Followed by
- data-link layer
- Official website
- www.iso.org/ics/35.100.10/x
Show 4 more facts
- Commons category
- Physical layer
- Stack Exchange tag
- networkengineering.stackexchange.com/tags/layer1
- standards body
- International Organization for Standardization
- topic's main category
- Category:Physical layer protocols
Sources (3)
via Wikidata · CC0
~9 min read
Encyclopedic overview
In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer: the layer most closely associated with the physical connection between devices. The physical layer provides an electrical, mechanical, and procedural interface to the transmission medium. The shapes and properties of the electrical connectors, the frequencies to transmit on, the line code to use and similar low-level parameters are specified by the physical layer.
At the electrical layer, the physical layer is commonly implemented in a dedicated PHY chip or, in electronic design automation (EDA), by a design block. In mobile computing, the MIPI Alliance *-PHY family of interconnect protocols are widely used.
Excerpted from Wikipedia’s “physical layer” article, available under the CC BY-SA 4.0 licence.