Panasonic VA-123210 Installation And Programming Manual page 13

Be sure the power switch is off, before installing or removing the cards.
Make connections of an CO/PBX line cards and to respective CO/PBX line according to the following procedure. When insert-
ing the CO/PBX line cards, make sure that the card top and bottom ribs are aligned with the respective slots located at the
regular positions inside the key service unit.
line cards
Insert the CO/PBX line cards into the
key service unit. This one card makes
four CO/PBX lines operable.
Co~~~~~io~ of central office lines
Connect the central office lines to the
respective jacks on the card. COL
Nos. 9, 10, 12 and 12 assigned to the
connectors in order from the top.
COL12
COLll
COL 10
COL9