Editing Pulse-amplitude modulation (section)

===Ethernet===
Some versions of the [[Ethernet]] communication standard are an example of PAM usage. In particular, [[100BASE-T4]] and [[BroadR-Reach Ethernet standard]] use three-level PAM modulation (PAM-3), while [[1000BASE-T]] Gigabit Ethernet uses five-level PAM-5 modulation<ref>{{cite magazine |title=What PAM5 means to you |magazine=EDN |url=https://www.edn.com/what-pam5-means-to-you/ |author=George Schroeder |date=2003-04-01 |access-date=2022-02-16}}</ref>{{efn|The first use of PAM-5 in Ethernet was in [[100BASE-T2]]. Although not widely adopted, the technology developed for 100BASE-T2 was subsequently used in the popular 1000BASE-T Gigabit Ethernet standard.}} and [[10GBASE-T]] 10 Gigabit Ethernet uses a [[Tomlinson-Harashima precoding|Tomlinson-Harashima precoded]]{{technical inline|date=October 2022}} (THP) version of pulse-amplitude modulation with 16 discrete levels (PAM-16), encoded in a two-dimensional checkerboard pattern{{technical inline|date=October 2022}} known as DSQ128. [[25 Gigabit Ethernet]] and some copper variants of [[100 Gigabit Ethernet]] and [[200 Gigabit Ethernet]] use PAM-4 modulation.