Panasonic KX-TD500 System Reference Manual page 49

24.00 CONF Card
Functions
TSW Conference Expansion card (KX-TD50104)
Mounted on TSW card.
3 party x 64 conference circuits.
25.00 OHCA Card
Functions
OHCA (Off Hook Call Announcement) card
(KX-T96136)
This card is mounted on HLC card (KX-T96170)
or PLC card (KX-T96172)
This card includes 2 OHCA circuits.
Allows an extension user to intrude through the
speaker into another extension that is in
conversation using the handset.
This feature is available only the following PITS
telephones: KX-T123230D, KX-T123235, KX-
T7130.
26.00 DPITS OHCA (DOHCA)
Card
Functions
DPITS OHCA card (KX-TD50105)
This card is mounted on TSW card for OHCA
feature for DPITS.
This feature is available only the KX-T7235.
27.00 OPX Power Unit
Functions
OPX (Off Premise Extension) Power Unit
(KX-T96186).
Output is Ringing Signal (100VAC, 20Hz) and
48V DC for OPX Card.
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