External Power Straps; Electronic Telephone Upgrade Options; Off-Hook Call Announce Upgrade (Hvsu2 Or Hvsu/Hvsi) - Toshiba Strata DK24 Installation And Maintenance Manual

2) Refer to Figure 7-7, and install a strap in the
HS-BOV W409 location.
3) Reinstall the telephone base, and secure it
with its four captive screws.
NOTE:
To enable Busy Override tone and Camp-on
Ring tones over the handset or headset of a
DKT2010-SD, DKT2020-SD, DKT2020-S
model, hold down the
Redial
the up button. To block the tone, hold
Vol
down the Redial button and press the down
button.
Vol

3.80 External Power Straps

3.81 Digital telephones equipped with options
such as Integrated Data Interface Units require
two-pair wiring or external power to operate effi-
ciently at the maximum-allowed distance from the
key service unit (KSU). Two-pair wiring or external
power is also necessary for maximum cable run
lengths for digital telephones that are connected to
systems that must operate with reserve power.
(See Table 9-D in Section 400-096-209 for refer-
ence.)
Each Digital telephone has two external power
straps which can be cut for external power when
the cabling of the telephone is connected to an
external AC/DC power supply. Cut these straps in
accordance with the following procedure:
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) Depending on the telephone, refer to Figure
7-7, 7-8, or 7-9 and locate the EX.POW
straps, W101 and W102. Cut these straps.
3) Reinstall the telephone base, and secure it
with its four captive screws.
button and press
7-11
INSTALLATION-TELEPHONE
NOTE:
Refer to Section 400-096-209 for external
AC/DC power supply installation instructions.
4 ELECTRONIC TELEPHONE UPGRADE
OPTIONS
4.00 This section describes how to upgrade and
configure electronic telephones for features and
options.
4.10 Off-hook Call Announce Upgrade
(HVSU2 or HVSU/HVSI)
4.11 Electronic telephones equipped with either
the HVSU2 subassembly or the combined HVSU
and HVSI subassemblies can receive Off-hook
Call Announce (OCA) calls. These telephones
also require three-pair wiring to receive OCA,
instead of the standard two-pair. Telephones mak-
ing OCA calls do not require an upgrade or extra
wire pair.
4.12 HVSU2 Upgrade Installation. Install the
HVSU2 in accordance with the following steps:
1) Loosen the four captive screws securing the
telephone base (Figure 7-1), and remove the
base.
2) Position the HVSU2 on the standoffs inside
the base, and secure with the two provided
screws (Figure 7-12).
3) Connect the HVSU2 wire plug to the P2
connector on the printed circuit board (PCB)
in the telephone (Figure 7-13).
4.13 HVSU/HVSI Upgrade Installation. In-
stall the HVSU/HVSI subassemblies in accor-
dance with the following steps:
1) Loosen the four captive screws securing the
telephone base (Figure 7-1), and remove the
base.
2) Align the P5 connector on the HVSI subas-
sembly with the receptacle on the HVSU
subassembly (Figure 7-14). Apply firm, even
pressure to the PCBs to ensure that the
connectors mate properly (they should click).
SECTION 400-096-207
SEPTEMBER 1992