Panasonic KX-NS500 Installation Manual page 74

4.2.5 Installing/Removing the Optional Service Cards
3.
Insert the spacers into the holes on the card, and tighten the spacers to secure the card.
Note
When using larger sized cards with smaller sized cards, install the larger sized cards in the bottom.
4.
Connect cables to appropriate ports of the card. For details about pin assignments, refer to the appropriate
section in "4.5 Physical Trunk and Extension Cards".
Note
Make sure to connect cables after installing the card in the PBX, not before.
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