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Section 1 - Installation
1.1 General Information
The DoorKing Model 1820 telephone intercom system provides communication to, and control of, a
door (or gate) for up to 1200 users without the need for a dedicated Central Office (C.O.) phone line.
This eliminates monthly line charges and equipment lease payments to the telephone company. The
system is used widely with housing authority projects and low income housing because the system
will provide all building residents, whether they have central office phone service or not, with
communication and control of the door or gate.
This manual describes the installation and wiring of the 1820 main and auxiliary control cabinets, and
the RJ71C phone block(s) only. For installation instructions on the front lobby panel(s) that are to be
used with the system, refer to the manual that is included with the lobby panel. The main and
auxiliary cabinets should be mounted close to the RJ71C phone blocks required for interfacing the
telephone lines with the system.
Central Office Phone Line.
Although a C.O. phone line is not required for normal system operation, having a C.O. line installed to
the 1820 main control cabinet will allow the use of the advanced features of the system. It should be
noted that this C.O. line is not used for normal lobby panel to resident communication and an access
code is required to utilize the C.O. line. Additionally, if a PC programmable telephone entry system
(DKS models 1833, 1834, 1835, 1837) is used as the lobby panel, installing the C.O. line will enable
programming of the system from an off site location. Order your telephone line at least two weeks
prior to the planned installation date. This will assure that a phone line is available when the unit is
installed. The telephone company will require the following information from you:
Type: Touch Tone, Loop Start
Ringer Equivalence: 0.0 A
Jack Type: RJ11C
FCC Registration (US): DUF6VT-12874-OT-T
DOC (Canada): 1736 4528 A
• Prior to starting the installation of this system, it is highly recommended that you become
familiar with the illustrations, instructions and wiring diagrams in this manual.
• It is recommended that the local telephone company install and wire the RJ71C phone blocks
required with this system.
1820-065-B-2-06 Page 9