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STRATA DK
GENERAL DESCRIPTION
DECEMBER 1990
can also be upgraded with off-hook call
anounce, loud ringing bell, and headset inter-
face capability.
l
Simultaneous Voice and Data: Digital
telephones may be upgraded with an inte-
grated data interface unit (PDIU-DI) to
receive and transmit simultaneous voice
and data; data and voice calls can be
made independently of each other. The
PDIU-DI (Figure 5) is easily installed,
replacing the usual digital telephone base.
Asynchronous data devices, such as per-
sonal computers and terminals, can be
connected to the standard RS-232 connec-
tor of the PDIU-DI. Station users are able
to transmit and receive RS-232 data over
the PDIU-DI-equipped digital telephone’s
single twisted wire pair. 2B+D technology
enables the digital telephone and the
PDIU-DI to share the same wire pair and
station port (see Table D).
FIGURE 54NTEGRATED DATA INTERFACE UNIT
(PDIU-DI)
NOTE:
The PDIU-DI will function with all slots,
except slots 11 w 14 in DK96.
l
Off-hook Call Announce Upgrade: If
equipped with an off-hook call announce
(OCA) upgrade assembly, each digital tele-
phone may receive intercom calls when
the handset is off-hook.
l The OCA upgrade assembly for digital
t Requires Release 3 software
telephones is a small printed circuit
board, DVSU, which installs inside the
telephone base-with plug-in cormectors.
l Only those telephones programmed to
receive OCA announcements require a
DVSU.
l An extra wire pair is not required for
digital telephones to receive or originate
OCA, and no other subassemblies are
required for the Digital Telephone
Interface PCB (PDKU).
l Loud Ringing Bell/Headset Upgrade:
Each digital telephone may also be
upgraded to provide a loud ringing bell
interface and a modular headset interface.
To accomplish this, an upgrade assembly
consisting of a small PCB (HHEU) installs
inside the phone with a plug-in connector.
The loud ringing bell and headset options
are available simultaneously on a digital
telephone.
l Loud Ringing Bell: An external speak-
er (HESB) can be directly connected to
the upgraded phone. When the phone
e
rings, the HESB produces a loud tone
that mimics the phone’s ring. On voice
first intercom calls, the HESB amplifies
the caller’s voice announcement. See
the External Speaker option.
l Headset: Most standard headsets plug
into the HHEU jack and are compatible
with the digital telephone.
Option Combinations: A digital telephone may
use most of the .available upgrade options
simultaneously. For example, the same station
may be upgraded with a digital DSS console,
OCA, loud ringing bell, and headset. Digital
telephones upgraded with the PDIU-DI cannot
be wall mounted or upgraded with the loud
ringing bell, headset, or OCA interface, but
can be connected with digital DSS consoles.
Digital Direct Station Selection Consolet: The
Digital Direct Station Selection (DDSS) con-
sole is an optional, dedicated answering sta-
tion incorporating
a’busy
lainp field (Figure 6),
(
and can only be used with a digital telephone.
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