physical layer

(redirected from OSI layer 1)

physical layer

(networking)
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.

physical layer

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 and physical layer switch.
References in periodicals archive ?
OSI Layer 1 defines the most basic way for the two hardware devices to communicate at the mechanical and electrical or optical level.
2B1Q is a transmission line code at OSI Layer 1 that accesses the medium of twisted pair.
LightPointe products operate at OSI Layer 1 and are easily integrated with Thales' Datacryptor(R) family of encryption devices to meet FIPS compliance.
The Loea radio operates at OSI Layer 1 (physical layer) and are compatible with the Thales Datacryptor(R) family.
Spirent Communications(TM), a wholly owned business group of Spirent plc (NYSE:SPM) (LSE:SPT), today announced that it has extended OSI Layer 1 capabilities in the optical network environment with the industry's first DWDM optical network physical layer simulator.