Home Network Basis: Transmission Environments and Wired/Wireless Protocols

6.3. 100BaseT4

All versions of Ethernet with a transmission throughput of 100 Mbps belong to the group of 100BaseT. They include 100BaseT4 on four pairs of a Category 3 or better twisted pair cable, 100BaseTX on two pairs of a Category 5 twisted pair cable, 100BaseFX on two multimode fibers, and 100BaseT2 on two pairs of a Category 3 or better twisted pair cable. All twisted pair–based 100BaseT Ethernet will be discussed in the remainder of this chapter. All these twisted pair–based Ethernet versions use the same RJ-45 connector. To recognize each Ethernet transceiver's physical layer capabilities and to obtain the best performance match between multimode transceivers, an autonegotiation process, which will be discussed at the end of this chapter, ...