Panasonic KX-TD500 System Reference Manual page 47

20.00 OPX Card
Functions
OPX (KX-T96185) -----Off Premise Extension.
(4 OPX Lines / card)
OPX Power Unit is
necessary.
OPX Power Unit should be connected with OPX
card, and Single Line Telephones for OPX should
be connected with OPX card.
21.00 DPH Card
Functions
Doorphone card (KX-T96161)
(1) Doorphone interface (4 circuits / card)
4 doorphones can be connected using a
modular connector.
(2) Door opener interface (4 circuits / card)
DPH card has 4 relays for door opener.
(220VAC, 1A)
The relay opens for doorlock, closes for door
release. It also opens in the case of power
failure.
Operation
Terminal plate on the DPH card has 8 terminals,
2 leads from door opener are directly connected
to two of 8 terminals.
1-E-11