Physical Layer: Outline - cs cmu 2026

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The Physical Layer in the OSI Model (Layer 1) defines how data is physically transmitted across a network. Its key features include: Physical Connection: The Layer 1 deals with the actual physical components used to transmit data, such as cables, connectors, and signaling mechanisms.
The physical network consists of the cables (coaxial cable, twisted pair, fiber optic, and telephone lines) that connect the different hardware residing on the network, the adapter used on computers connected to the network (hosts), and any concentrators, repeaters, routers, or bridges used in the network.
The PHY layer defines the physical and electrical characteristics of the network. It is responsible for managing the hardware that modulates and demodulates the RF bits. The MAC layer is responsible for sending and receiving RF frames.
The physical layer is the first layer of the OSI model and includes the physical hardware required to connect your device to computer networks. By understanding its components, such as the topology, hardware, and functions, you can deepen your understanding of how computer systems work.
What are the network layers? Physical (e.g. cable, RJ45) Data Link (e.g. MAC, switches) Network (e.g. IP, routers) Transport (e.g. TCP, UDP, port numbers) Session (e.g. Syn/Ack) Presentation (e.g. encryption, ASCII, PNG, MIDI) Application (e.g. SNMP, HTTP, FTP)

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Frequently Asked Questions about Physical Layer The Physical Layers primary function is to transmit raw data bits over physical mediums like cables and fiber optics, converting digital data into signals for communication.
The logical layer defines how the tables dragged into the Relationship canvas are connected. Physical layer refers to the physical (i.e. tangible, or real) data sources. These are the actual data files, databases, or other data storage systems that can be related via joins, unions, pivots, and so forth.

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