The Overview page is a comprehensive page that aims to report in a single place most of the data needed to verify basic configuration settings and hardware status. The overview page is split in paragraphs
Ethernet ports state
There are multiple type of icons whose led colours represents the interface speed:
Amber = 10Mbps
The internal part of the icon turns to grey for half-duplex or black for full-duplex.
The blinking led always matches the speed colour and the flashing is hard-coded hence not linked to real network activity.