Figure 4.12 Multilevel:4D-PAM5 scheme 00011110 1 Gbps 250 Mbps Wire 1(125 MBd) 250 Mbps Wire 2(125 MBd) +2 +1 250 Mbps Wire 3(125 MBd) 250 Mbps >Wire 4(125 MBd) 4.33 4.33 Figure 4.12 Multilevel: 4D-PAM5 scheme