why in example"Architectural 112G PAM4 ADC-Based SerDes Model",symbol time is set to 18.8235e-12,which is 106GHz

1÷18.8235（ps） = 53.125G ，cause is PAM4 ，2* 53.125 = 106.25GHz ，which is not equal to 112

Answer 1

[Walter Roberson]

The previous generation used a signaling rate of 53.125 GBd . This generation is twice that signaling rate.

https://www.ieee802.org/3/ck/public/19_03/sun_3ck_04b_0319.pdf

[xufei wang]

ok，now I know that in the spec it is exactly 53.125GBd. thank you!

Whether the example's title is incorrect?

[Walter Roberson]

There are multiple bits per symbol.