Off-Hook Call Announce Upgrade (Dvsu); Loud Ringing Bell/Headset Upgrade (Hheu) - Toshiba Strata DK24 Installation And Maintenance Manual

INSTALLATION-TELEPHONE
SECTION 400-096-207
SEPTEMBER 1992
RED
WIRE
RED WIRE
FIGURE 7-6
DVSU INSTALLATION FOR DIGITAL
TELEPHONES
Programs 20 and 22
•
Used for data interface unit assignments.
3.20 Off-hook Call Announce Upgrade
(DVSU)
3.21 To receive Off-hook Call Announce (OCA)
calls, a digital telephone must be upgraded with a
DVSU; the telephone making the call does not
require a DVSU. An additional wire pair is not
required for digital telephones that receive OCA
calls. The DVSU is compatible with both 2000-
series and 1000-series Digital Telephones.
NOTE:
Digital telephones cannot be equipped with a
DVSU and integrated data interface unit
(PDIU-DI or PDIU-DI2) at the same time.
3.22 DVSU Upgrade Installation. Install the
DVSU upgrade in accordance with the following
steps.
1) Loosen the four captive screws securing the
telephone base (Figure 7-1) and remove the
base.
NOTE:
Although Figure 7-1 specifically illustrates
how to remove an electronic telephone base,
it also applies to digital telephones.
2) Loosen the four captive screws securing the
metal plate to the standoffs inside the base
where the DVSU will be installed (Figure 7-6).
Remove the plate, which can be discarded.
3) Position the DVSU PCB on the standoffs
(Figure 7-6), and secure with the four pro-
vided screws.
4A) If installing the DVSU into a 2000-series digital
telephone, refer to Figures 7-7 (DKT2010-H)
or 7-8 (DKT2010-SD, DKT2020-S, DKT2020-
SD), and then connect the DVSU wire plugs
to the DVSU connectors on the printed circuit
board (PCB) inside the telephone.
4B) If installing the DVSU into a 1000-series digi-
tal telephone, refer to Figure 7-9, and connect
the DVSU wire plugs to the DVSU connectors
on the PCBs inside the telephone.
5) Reinstall the telephone base and secure it
with its four captive screws.
3.30 Loud Ringing Bell/Headset Upgrade
3.31 The loud ringing bell/headset upgrade (HHEU)
enables an external speaker (HESB) for the Loud
Ringing Bell feature and/or a headset to be con-
nected to both series of digital telephones.
NOTES:
1. There are two types of HHEU: the HHEU1
(which has four versions, V.1 ~ V.4) and
the HHEU2.
2. Both 2000- and 1000-series Digital Tele-
phones require either an HHEU2 or a V.3
or V.4 HHEU1 for HESB operation; earlier
HHEU1 versions are only sufficient for
headset operation only.
3. Only digital telephones equipped with an
HHEU2 can be wall mounted. The HHEU2
is identical to the V.4 HHEU1, except that
the HHEU2 has longer wires to accom-
modate wall mounting.
7-6