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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 broadcast on, the line code to use and similar low-level parameters, are specified by the physical layer. Role The physical layer consists of the electronic circuit transmission technologies of a network.[2] It is a fundamental layer underlying the higher level functions in a network, and can be implemented The physical layer is responsible for the communication of unstructured raw data streams over a physical medium. It defines a range of aspects, including: Electrical, mechanical, and physical systems and networking devices that include specifications such as cable size, signal frequency, voltages, etc. Topologies such as Bus, Star, Ring, and Mesh. Without much prior knowledge of physical layer testing the descriptions and figures can be somewhat confusing at first glance. There are five defined points with transmit and receive versions of each. The five are α (alpha), β (beta), γ (gamma), δ (delta), ε (epsilon). For generic testing only three of these will be considered: β •Hard Drives mechanism. Physical layer is the only layer of OSI network model which actually deals with the physical connectivity of two different stations. This layer defines the hardware equipment, cabling, wiring, frequencies, pulses used to represent binary signals etc. Physical layer provides its services to Data-link layer. Data-link layer hands over frames to physical What is Physical Layer. Definition: Physical layer is a layer 1 in the OSI model that plays major activity for interacting along with hardware components and signal mechanism system. This layer actually deals with making connection of two distinct station points. Physical layer specifies the hardware resources, frequencies, pulse, and cabling which are represented to binary signal like as 0's and 1's.