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INSTALLATION-STATION APPARATUS
SECTION 100-816-206
MARCH 1993
6-6
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 6-1) and remove the
base.
2) Loosen the four captive screws securing the
metal plate to the standoffs inside the base
where the DVSU will be installed (Figure 6-6).
Remove the plate, which can be discarded.
3) Position the DVSU PCB on the standoffs
(Figure 6-6), and secure with the four pro-
vided screws.
4A) If installing the DVSU into a 2000-series digital
telephone, refer to Figure 6-7 (DKT2010-H)
or Figure 6-8 (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 6-9, 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
(HHEU)
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; ear-
lier 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.
4. A Toshiba HESC-65A cable is required to
connect the HHEU in a digital telephone
to the HESB.
5. 1000-series digital telephones cannot be
equipped with the HHEU (any type or
RED
WIRE
RED WIRE
FIGURE 6-6
DVSU INSTALLATION FOR DIGITAL
TELEPHONES