Verizon FIOS - plugs straight into the D-Link router.
I'm connecting both wired and wirelessly - doesn't matter, as the router stops passing traffic of all types.
I am using mixed - I could try straight G or N (but shouldn't have to).
There are a few other WIFI in the area, as with most civilized outposts

We do have Siemens Gigaset 8845 cordless phones in the house - 2.4GHZ
I don't experience interference - the router hangs and has to be rebooted.
Thanks,
-B