100BaseT

100BaseT is a standard for Ethernet networking that operates at a data rate of 100 megabits per second (Mbps) over twisted pair cabling. It is part of the IEEE 802.3u standard, which was finalized in 1995. The "T" in 100BaseT refers to the use of twisted pair cabling, specifically Category 5 (Cat5) or higher, which is capable of supporting higher data rates and longer distances compared to earlier Ethernet standards.

100BaseT uses a star topology, with a central hub or switch connecting multiple devices. It employs a technique called 4B5B encoding to transmit data, which allows for efficient use of the available bandwidth and helps to minimize errors. The standard also includes support for full-duplex communication, which allows for simultaneous sending and receiving of data, thereby doubling the effective data rate.

100BaseT is widely used in modern Ethernet networks due to its high data rate, reliability, and compatibility with existing cabling infrastructure. It is often used in local area networks (LANs) to connect computers, printers, and other devices within a building or campus. The standard has been superseded by faster Ethernet standards such as 1000BaseT (Gigabit Ethernet) and 10GBaseT, but it remains an important part of the Ethernet ecosystem.