Ethernet - definition
Ethernet - definition
Ethernet is a network communication standard based on packet-switched data transmission technology, used to create local area networks (LANs) and Industrial Networks. Its architecture is based on the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) protocol, which enables multiple access to the transmission medium and collision detection to ensure efficient management of network traffic in a shared access environment.
The basis of Ethernet technology is the data frame, consisting of a header containing the MAC addresses of the sender and receiver, a field specifying the type of data to be transmitted and a CRC (Cyclic Redundancy Check) checksum to detect transmission errors.](/ca/en/news/library-articles/page/69482/) Higher bandwidth versions of Ethernet [implement flow control and packet prioritisation mechanisms, which minimise delays and increase the deterministic nature of transmission in real-time systems.
Others Ethernet's physical layer includes a variety of transmission standards, including wired connections based on twisted pair copper, fibre and coaxial connections, which vary in electrical performance and immunity to electromagnetic interference. The bandwidth of Ethernet standards has evolved from the original 10 Mbps (10BASE-T) through 100 Mbps (Fast Ethernet) and 1 Gbps (Gigabit Ethernet) to the advanced 10 GbE, 40 GbE and 100 GbE technologies that are used in high-performance networks and data centres.
At the data link layer, Ethernet uses switches that eliminate the problem of network collisions by segmenting traffic and dynamically mapping MAC addresses to physical ports. Modern Ethernet implementations use redundancy protocols such as RSTP (Rapid Spanning Tree Protocol) and PRP (Parallel Redundancy Protocol) to provide fault tolerance and uninterruptible switching between transmission paths.
In the context of Industrial Networks, an extension of classic Ethernet are deterministic technologies such as EtherCAT, PROFINET or Time-Sensitive Networking (TSN), which guarantee predictable latency and synchronisation timing, crucial for process control applications and robotics. The integration of Ethernet with IP communication systems enables its use in distributed control system infrastructures, smart buildings and IoT platforms, where scalability and interoperability with application layer protocols are key.
Ethernet developments include the implementation of energy-efficient standards such as IEEE 802.3az (Energy Efficient Ethernet), which reduce energy consumption during periods of low transmission activity. In the security context of Ethernet technology, access protection mechanisms such as VLAN (Virtual Local Area Network), IEEE 802.1X (port-based authentication) and IDS intrusion detection systems are being used to detect anomalies in network traffic and protect against Man-in-the-Middle attacks.
The use of Ethernet covers a wide range of environments, from home and office networks to telecommunications, industrial and military infrastructures. Its high scalability, transmission fault tolerance and ability to be implemented in low-latency environments mean that it remains the dominant networking technology in modern ICT systems.
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