Panasonic KX-TD1232E Installation Manual page 72

2.4 Optional Cards and Units Installation
2.4.4 CO Line Connection (Optional Unit)
2.4.5 Extension Connection (Optional Unit)
2-36 Installation
To add four CO lines (KX-TD816: CO 5 through CO 8, KX-
TD1232: CO 9 through CO 12), use the optional 4-CO Line Unit
(KX-TD180).
To add two ISDN S0 lines, use the optional 2-ISDN S0 Line Unit
(KX-TD280).
To add six ISDN S0 lines, use the optional ISDN 6-S0 Line Unit
(KX-TD286). When the KX-TD286 is installed in the KX-TD816,
only four ISDN S0 lines are available for outside lines and the other
ports are for extension lines (ISDN extensions). Then the two basic
analog ports cannot be used.
One of these units can be installed in any of the two/three
expansion areas provided on the front of the main unit.
For Unit Installation, see Section 2.4.6 "Installing Expansion Unit."
To add eight extensions (KX-TD816: jacks 9 through 16, KX-
TD1232: jacks 17 through 24), use the optional 8-Station Line Unit
(KX-TD170).
To add 16 extensions (jacks 17 through 32),* use two 8-Station
Line Units.
This unit can be installed in any of the two/three expansion areas
provided on the front of the main unit.
For Unit Installation, see Section 2.4.6 "Installing Expansion Unit."
*: Available for KX-TD1232 only.