Toshiba Strara CTX Series, Installation And Maintenance Manual, Page: 260 / 290

Peripheral Installation
8-14
Strata CTX I&M September 2002
Door Phone/Door Lock with DDCB Interface
The Strata CTX supports up to eight DDCB door phone control
boxes. Each DDCB supports up to three MDFB door phones which
provides a total of up to 24 door phones (see
Figure 8-15 ). Each
DDCB can provide a door unlock control relay in place of one of the
door phones.
DDCB and MDFB Cabling
For DDCB and MDFB wiring/interconnecting details and door lock
control installation procedures and secondary protection
information, refer to
Chapter 6 – MDF PCB Wiring . If using
CW1308 0.5 cable, the length of the cable run from the Strata CTX
to the MDFB (via the DDCB) must not exceed 1,000 feet (305
meters).
◆
DDCB cable runs must not have cable splits (single or double),
cable bridges (of any length) or high resistance or faulty cable
splices.
DDCB Wall Mounting
The DDCB is designed to be mounted on a wall or
other vertical surface.
➤
To mount the units
1. Locate the two mounting holes on the right-
hand side on the DDCB (see Figure 8-14 ).
2. Remove the side cover from the DDCB to
expose the two left-hand mounting holes.
3. Position the DDCB adjacent to the Base KSU
with regard to wiring needs.
4. Secure the DDCB to the mounting surface
with four one-inch panhead wood screws.
Door Phone Wire Connections
Up to 24 door phones can be connected to the Strata CTX system. Door phones are connected as
follows: Up to three MDFB, door phones can connect to a single DDCB door phone control box,
which in turn connects to a single DKT interface port (See
Figure 8-16 for door phone wiring
diagram). Only one of the three connected door phones can be active at a given point in time.
1873
1874
KSU
A
B
C
DOOR
PHONE
Mounting
Screws (4)
External Power Straps
(DDCB Only)
KSU
Jack
MDFB
Jack
A~C
1493
Figure 8-14 Door Phone (DDCB) Installation