P.O.D. = P = padded cell

packet over air

[common among backbone ISPs] The protocol notionally being used by Internet data attempting to traverse a physical gap or break in the network, such as might be caused by a fiber-seeking backhoe. "I see why you're dropping packets. You seem to have a packet over air problem."

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.