In order to install a digital card, does the system have to be powered down, or can this be done live? I guess what I mean is, are the cards hot swap capable?
If it is a new installation simply install the digital line card into a spare vacant slot. Then program an extension on this port. If an extension is not programed then the card will not be seen and will still be seen as a vacant slot.
If you are swapping out a digital line card for another you should disable the card then swap cards then re-enable the card again.
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