Panasonic KX-TD500 System Reference Manual page 85

2) Connection to the PLC card (KX-T96172)
OHCA card
1. Make sure that the extensions which use OHCA function have OHCA cards.
2. Insert the connector (plug) on the OHCA card into the connector (jack) on the PLC
card.
3. Install the PLC card to a free slot. See page 2-C-22.
Two extensions are available for the OHCA function with one OHCA card. Refer to
page 2-C-8.
The OHCA function is provided with the following PITS telephones only:
KX-T123235, KX-T123230D or KX-T7130.
PLC card
2-C-7
9-pin connector
(plug)
5-pin connector
(plug)
4-pin connector
(plug)
9-pin connector
(jack)
5-pin connector
(jack)
4-pin connector
(jack)