10G-EPON vs. XGS-PON: What's the difference

There are two standards being used in fiber deployments to provide 10 gigabit upload and download speeds on a shared fiber network. But what are the differences between 10G-EPON and XGS-PON? Kevin Noll with CableLabs breaks it down in this great article on the CableLabs website. It's a quick read and very enlightening.