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Peripheral Installation
Door Phone/Door Lock with DDCB Interface
12-14 Strata CTX I&M 06/04
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
12-15). 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 10 – MDF PCB Wiring. If using
24 AWG 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.
³ To mount the units
1. Locate the two mounting holes on the
right-hand side on the DDCB (see Figure
12-14).
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 12-16 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 12-14 Door Phone (DDCB) Installation