You might be living on borrowed Time!!
the 540 means 19 slots times 12 = 228(1 cab)it doesn't matter if You are using the "port"
or not a port can be anything, Digitial station, Analog station, DTMF Receiver, Trunk , Or the CNF which are used for Conference's (they might do something else as well) an empty slot is also taking up part of the 540!
540/12= 45 slots = 2 full cab's and 7 slots in the 3rd cab... You say You have 10 cards installed in the 3rd cabinet, do the card Identifers show up on the left hand side of the ' F ' screen?
