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physical layer

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The services in the OSI protocol stack (layer 1) that provide the transmission of bits over the network medium. Also known as the "PHY" layer. See OSI model.

(networking)

physical layer - Layer one, the lowest layer in the OSI seven layer model. The physical layer encompasses details such as electrical and mechanical connections to the network, transmission of binary data as changing voltage levels on wires or similar concepts on other connectors, and data rates.

The physical layer is used by the data link layer.

Example physical layer protocols are CSMA/CD, token ring and bus.

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References in periodicals archive

802.11h
air interface
Fibre Channel
layer 1
maximum segment size
media access control

peer
PHY
two-binary, one-quaternary
wire level protocol
wire protocol

Atmel Corporation (Nasdaq:ATML), a leader in the development and fabrication of advanced semiconductor solutions, announced recently the completion of a licensing agreement with National Semiconductor Corporation for a Gigabit Ethernet Physical Layer Core.

Atmel licenses industry-leading Gigabit Ethernet Physical Layer Core by EDP Weekly's IT Monitor

Technologies run into interoperability hurdles when every aspect of the technology is new, from the physical layer all the way up the stack.

Smooth sailing for SAS? Not all technologies are created equal by Woolf, David / Computer Technology Review

Engineering contractors, commissioning experts, plant operators and maintenance specialists gain visibility into the fieldbus physical layer for faster commissioning work, longer plant-uptime, true preventative maintenance and efficient troubleshooting.

Pepperl+Fuchs Advanced Diagnostics Module is Breakthrough Product of ... by Business Wire

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