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The symbol rate is identical to that of 100BASE-TX (125 megabaud). On a copper based Gigabit Ethernet Network (1000BaseT), transmission uses four lanes over all four cable pairs for simultaneous transmission in both directions through the use of echo cancellation with adaptive equalization and five-level pulse amplitude modulation (PAM-5).
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When the 8b10b line coding is removed from the raw data stream by the Gigabit Ethernet chipset, this allows an uncoded payload of exactly 1.0Gbps. Line Coding is used to ensure “DC balance” of the data stream, remove long runs of consecutive 0’s and 1’s, which makes the physical transceivers easier to design, implement, and maximises performance of the fibre optic transceiver range capability.
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This raw data rate is chosen to include 8b10b Line Coding. On a Fibre Optic Gigabit Ethernet Network (1000BaseSX, 1000BaseLX), the raw line rate is 1.25Gbps. Also covered is how that relates to throughput of a Wireless Link with Gigabit Ethernet interfaces. Examining how much throughput of actual throughput can be achieved on a Gigabit Ethernet based network and how much this increases by using Jumbo Frames.