Toshiba Strara CTX Series, Installation And Maintenance Manual, Page: 235 / 290

Station Apparatus
7-37
Strata CTX I&M September 2002
Telephone Speaker Off-hook Call Announce Upgrade (DVSU)
To receive Speaker Off-hook Call Announce (OCA) calls over the digital telephone speaker, a 2000/
2500-series digital telephone must be upgraded with a DVSU; the telephone making the call does not
require a DVSU. Digital telephones do not require an additional wire pair to receive Speaker OCA
call.
BVSU/DVSU Upgrade Installation
See Figures 7-25 and 7-31 and follow these steps:
1. Loosen the four captive screws on the
telephone base and remove the base.
2. For the BVSU only, make sure that the SW1
and SW2 pins are set per Tables 7-9 and
Tables 7-10 .
3. Position the BVSU/DVSU PCB on the
standoffs, and secure with the four provided
screws.
4. Connect the BVSU/DVSU wire plugs to the
DVSU connectors on the PCB inside the
phone.
5. Reinstall the telephone base and secure it
with its four captive screws.
Figure 7-32 Speaker Off-hook Call Announce Upgrade (BVSU1A)
T o P C I/V S U
C onnec tors
on T elephone
R ed W ire
F asten
F our
S c rews
6072
Figure 7-31 BVSU/DVSU Installation
6073
BVSU1A
HF U
S P F
SW
2
S W 1
20 Mu
20 A
30
Move jumper to
the middle position
(20 Mu) for
DKT2000 phones