Panasonic KX-TD1232E Installation Manual page 26

1.4 Options
8-Station Line Unit (KX-TD170)
8 or 16 extensions
can be added.
4-CO Line Unit (KX-TD180) /
2-ISDN S0 Line Unit (KX-TD280) /
6-ISDN S0 Line Unit (KX-TD286)
4 CO lines / 2 ISDN S0 lines /
6 ISDN S0 lines can be added.
1-6 System Outline
Each unit adds eight extensions. One expansion unit for KX-
TD816, and up to two expansion units for KX-TD1232 can be
installed per system.
One of the following units can be installed per system.
KX-TD180 : Adds four CO lines.
KX-TD280 : Adds two ISDN S0 lines (Basic Rate Interface).
KX-TD286 : Adds six ISDN S0 lines (Basic Rate Interface).
D816 D816
DIGITAL SUPER HYBRID SYSTEM
8 extensions can
be added.
D816 D816
DIGITAL SUPER HYBRID SYSTEM
4 CO lines / 2 ISDN S0 lines /
6 ISDN S0 lines can be added.