Please help with understanding of fast poller

[new-to-linux]

Hi I would like to know the set up of the fast poller,

I understand that the fast poller updates cacti internal host up down status and threhold email based on this for downed hosts.

What I would like to know is where I can configure how the fast poller pings or find out what it currently does.
Does it send out only one ping if there is no response it is classed as down, does it send out a series of pings, what is the milli seconds time out etc


Thanks for all your great work