Hello!
I will introduce you the difference between 100BASE-T4 and 100BASE-TX.
Fast Ethernet currently has three standards for transmission media: 100BASE-T4, 100BASE-TX, and 100BASE-FX. The latter two support full-duplex mode.
100BASE-T4 uses 4 pairs of category 3 unshielded twisted-pair wires, and the maximum transmission distance is 100 meters. Three pairs of lines are used to transmit data (the data transmission rate of each pair of lines is 33.3 Mbps), and one pair of lines is used for collision detection and control signal transmission and reception. The signal of 100BASE-T4 adopts 8B / 6T coding method, that is, every 8 bits are converted into a group of data every 6 bits, and the ternary code group is set every 6 bits. The information transmission rate of each output channel is 33.3Mbps * 6/8 = 25Mbaud.
100Base-T4: cable type: 4 pairs of unshielded twisted pairs or shielded twisted pairs of 3, 4, and 5; the number of bundles: 4 pairs; the maximum segment length: 100M; the maximum diameter of the network: 200M.
100BASE-TX uses two pairs of Category 5 unshielded twisted-pair cables with an impedance of 100 ohms. The maximum transmission distance is 100 meters. One pair is used to send data and the other is used to receive data. 100BASE-TX uses a 4B / 5B encoding method, that is, each 4 bits of data is represented by a 5-bit encoding group, and the symbol utilization rate of this encoding method is 4/5 * 100% = 80%. Then encode 4B / 5B into NRZI for transmission.
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