From the images it looks like there are only ports near the base, two on each side. There might be some on the outside edge, but you can't really see any in the images that are floating around.
The cover of "A Ceremony of Losses
" shows these ports side ports. I wonder what that thing at the base of the pylon is, maybe a weapons emplacement?
Apparently those rings above and below the central core are magnetically suspended defence rings.