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STRATA DK
GENERALDESCRIPTION
DECEMBER1990
one 2B+D station port on a PDKU (see Printed
Circuit Boards) and will function on one wire
NOTES:
1. The PDIU-DS will function with all slots,
except slots 11 u 14 in DK96.
2. Modems, printers, and mainframes are
connected to the standard RS-232
DB25 connector on the PDIU-DS (see
Table 0).
Door Phone: In one of its most popular applica-
tions, the door phone (Figure 12) mounts out-
side a building, next to a locked door whose
entry requires screening. An individual located
outside the building who wants to speak with
someone inside simply presses the button on
the door phone. A distinctive tone will then
sound over the speakers of the digital and/or
electronic telephones defined to do so through
system programming. Any digital or electronic
telephone user can answer and converse with
the individual at the door phone. If the system
is properly configured, the user can allow entry
using a door lock button on the digital or elec-
tronic telephone.
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A door phone also functions as a sound
monitor. Any telephone can call the door
phone and listen to sounds within its
immediate area.
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Up to twelve door phones can be support-
FlGURE12-DOORPHONE
ed with a PCTU, up to nine with a PCTUS.
A door phone/lock control unit
- (HDCB-Figure 13) must be installed to
support up to three door phones (or two
door phones and one door lock control).
Each HDCB requires one station port on
an electronic telephone interface PCB
(PEKU or PESU). Only one HDCB can be
installed on a particular PEKU or PESU.
FlGURE13-DOORPHONE/LOCK
CONTROLUNlT(HDCB)
NOTE:
The PDKU cannot support an HDCB.
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Door lock control requires an optional
interface PCB (PIOU, PEPU, or PIOUS)
and/or an HDCB. Up to five door lock con-
trols can be installed, but each door lock
controlled by an HDCB reduces the door
phone capacity on that HDCB from three
to two.
External Speaker: The HESB external speaker
unit is a 6-inch, 3-watt speaker with a built-in
amplifier (Figure 14). A +12 VDC power supply
(HACU-120) is included with each external
speaker. It connects to the back panel with an
8-foot cord and plugs into a 117VAC, 60 Hz
outlet. The HESB has three applications:
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Amplified Paging Speaker: Allows the
HESB to be used as a paging speaker,
reducing the need for other manufacturers’
paging equipment.
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