![]() ![]() The MAC may be linked to the PHY by a four-bit 25 MHz synchronous parallel interface known as a Media Independent Interface (MII), or by a two-bit 50 MHz variant called Reduced Media Independent Interface (RMII). The letter following the dash ("T" or "F") refers to the physical medium that carries the signal (twisted pair or fiber, respectively), while the last character ("X", "4", etc.) refers to the used encoding method.Ī Fast Ethernet adapter can be logically divided into a Media Access Controller (MAC), which deals with the higher-level issues of medium availability, and a Physical Layer Interface (PHY). The "100" in the media type designation refers to the transmission speed of 100 Mbit/s, while the "BASE" refers to baseband signalling. The standard specifies the use of CSMA/CD for media access control, although in practice all modern networks use Ethernet switches and operate in full-duplex mode. Fast Ethernet is sometimes referred to as 100BASE-X, where "X" is a placeholder for the FX and TX variants. Fast Ethernet provides compatibility with existing 10BASE-T systems, enabling plug-and-play upgrades from 10BASE-T. It runs on UTP data or optical fiber cable in a star wired bus topology, similar to 10BASE-T where all cables are attached to a hub. General designįast Ethernet is an extension of the existing Ethernet standard. Of the Fast Ethernet standards, 100BASE-TX is by far the most common.įast Ethernet was introduced in 1995 as the IEEE 802.3u standard and remained the fastest version of Ethernet for three years before it was superseded by the Gigabit Ethernet. In computer networking, Fast Ethernet is a collective term for a number of Ethernet standards that carry traffic at the nominal rate of 100 Mbit/s (the original Ethernet speed was 10 Mbit/s).
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