Fast Ethernet is one of the three transmission media standards at present, and the other two are 100BASE-T4 and 100BASE-FX. 100BASE-TX, 100BASE-FX, where full-duplex mode is supported. 100Mbps port works in full-duplex mode, which can have data inflow and outflow ports at the same time, and bidirectional data flow can enjoy the bandwidth of 100Mbps, such as the port based on 100BASE-TX standard, and the bandwidth of the port working in full-duplex mode is 200Mbps. 100BASE-TX adopts five types of unshielded twisted pair, with two impedances of 100 ohm and the maximum transmission distance of 100 meter. One pair is used to send data and the other pair is used to receive data. 100BASE-TX adopts 4B/5B coding mode, that is, every 4 bits of data is represented by a 5-bit coding group, and the symbol utilization rate of this coding mode =4/5* 100%=80%. 4B/5B are then encoded into NRZI for transmission. The physical topology of 100BASE-TX is star-shaped. In the current networking mode, the network card with 100BASE-TX standard is the most widely used, and only supports RJ-45 standard, which is mostly used in backbone networks. The appearance of 100BASE-TX standard has played a key role in promoting the development of network structured cabling technology. Fast Ethernet supporting 10M/ 100M auto-negotiation 100BASE-T4 is one of the three major standards on transmission media at present, and the other two are 100BASE-TX and 100BASE-FX. The latter two support full duplex mode. 100BASE-T4 uses 4 pairs of unshielded twisted-pair cables of Class 3, and the maximum transmission distance is 100m. Among them, three pairs of wires are used to transmit data (the data transmission rate of each pair of wires is 33.3Mbps), and one pair of wires is used to check the collision and send and receive control signals. The signal of 100BASE-T4 adopts 8B/6T coding mode, that is, a group of 8-bit data is converted into a group of 6-bit ternary code groups, and the information transmission rate of each output channel is 33.3Mbps*6/8=25Mbaud.
100Base-FX
It is a 100 Mbps Ethernet standard implemented on optical fiber, where f stands for optical fiber, IEEE standard is 802.3u, and 100Base-FX runs on optical cable, which makes it very suitable for trunk and long-distance transmission. 100Base-TX, 100Base-T4 and 10Base-Thub can all be connected to the optical fiber backbone by using appropriate hardware devices such as bridges and routers. 100Base-FX also supports full-duplex operation. In order to realize the clock/data recovery (CDR) function, 100Base-FX uses the 4B5B encoding mechanism. See 100BaseT. Fast Ethernet is one of the three transmission media standards at present, and the other two are 100BASE-T4 and 100BASE-TX. 100BASE-TX and 100BASE-FX support full-duplex mode. 100Mbps port works in full-duplex mode, which can have data inflow and outflow ports at the same time, and bidirectional data flow can enjoy the bandwidth of 100Mbps, such as the port based on 100BASE-TX standard, and the bandwidth of the port working in full-duplex mode is 200Mbps. 100Base-FX uses two optical fibers, one for sending data and the other for receiving data. Single mode fiber or multimode fiber can be used. In the case of full duplex, the maximum transmission distance of single-mode fiber is 40 kilometers, and that of multimode fiber is 2 kilometers. 100Base-FX signal is encoded in the same 4B/5B NRZI scheme as 100Base-TX.
100base-t
100base-t Fast Ethernet: The difference with 10BASE-T is that the network speed is increased by 10 times, that is,100M ... adopts the PMD protocol of FDDI, but the price is cheaper than FDDI. The standard of 10BASE-T is formulated by IEEE802.3. It adopts the same media access technology, similar step size rules and the same outgoing line as 10BASE-T, and is easy to integrate with10base-t. Only two repeaters are allowed in each network segment, and the maximum network span is 2 10. 100 base-t:100 Mbps, baseband, twisted pair. In short, 100Base-T is a local area network (LAN) standard working at 100Mbps, which is usually called Fast Ethernet and uses UTP (Unshielded Twisted Pair) copper cable. There are three basic implementations of fast Ethernet: 100Base-FX, 100Base-TX and 100Base-T4. Except for the interface circuit, each specification is the same, and the interface circuit determines the type of cable they use. In order to realize the clock/data recovery (CDR) function, 100Base-T adopts 4B/5B Manchester coding mechanism.
100BASE-T4
Fast Ethernet is one of the three standards of transmission media at present, and the other two are 100BASE-TX and 100BASE-FX. The latter two support full duplex mode. 100BASE-T4 uses 4 pairs of unshielded twisted-pair cables of Class 3, and the maximum transmission distance is 100m. Among them, three pairs of wires are used to transmit data (the data transmission rate of each pair of wires is 33.3Mbps), and one pair of wires is used to check the collision and send and receive control signals. The signal of 100BASE-T4 adopts 8B/6T coding mode, that is, a group of 8-bit data is converted into a group of 6-bit ternary code groups, and the information transmission rate of each output channel is 33.3Mbps*6/8=25Mbaud.
100BASE-VG
100Base-VG Fast Ethernet deviates from the original Ethernet standard and runs on voice-level lines. 100Base-VG supports the isochronous transmission of voice and video by using dedicated bandwidth and priority protocol, so it can provide strong support for the development of networked multimedia applications. In addition, the technology of 100Base-VG can run on IBM token ring network, which is quite beneficial to the popularization of 100Base-VG. At present, 1000Mbps fast Ethernet has been commercialized, and1000 Mbps fast Ethernet has also entered the laboratory stage. Of course, as a transitional scheme, the existing local area network can also support multimedia communication by properly segmenting the existing local area network and reasonably limiting the number of users in each segment. For example, in theory, the IBM token ring network of 16Mbps can transmit at least four MPEG-II encoded video streams at the same time.
100BASE-T fast Ethernet
100BASE-T Fast Ethernet: The difference with 10BASE-T is that the network speed is increased by 10 times, that is,100M ... adopts the PMD protocol of FDDI, but the price is cheaper than FDDI. The standard of 10BASE-T is formulated by IEEE802.3. It adopts the same media access technology, similar step size rules and the same outgoing line as 10BASE-T, and is easy to integrate with10base-t. Only two repeaters are allowed in each network segment. What is the maximum network capacity? 10 meter.