1.5 TELEPHONE LINE WIRING – SINGLE UNIT
If any alarm systems are installed on the phone line, be sure that the alarm interface precedes the
1812 by-pass switch interface.
DOORKING
1875-010
GND
C.O.
1 2
PH IN
3 4
PH OUT
5 6
HOME
7 8
ENTRY
BY-PASS
Ground
C.O.
Demarcation
Home
Telephones
Phone In - 1
Phone In - 2
Case Ground - 3
Phone Out - 4
Phone Out - 5
1812 #1
Main
Terminal
Use only twisted pair telephone wire that is
rated for direct underground burial. Do not use
wire designed for indoor applications.
Phone In - 1
Phone In - 2
Case Ground - 3
Phone Out - 4
Phone Out - 5
.022pf
.022pf
DSL Filters
1. Connect PHONE IN wires from the BY-PASS switch to 1812 main terminals 1 and 2.
2. Connect PHONE OUT wires from the BY-PASS switch to 1812 main terminals 4 and 5.
3. Connect a ground wire to terminal 3.
4. Check for polarity on the phone "IN" wires, terminals 1 and 2. Terminal 2 must be positive
with respect to terminal 1. Set a VOM meter to measure DC volts. Place the positive lead
on terminal 2 and the negative lead on terminal 1. If the meter shows a positive voltage -
OK. If the meter shows a negative voltage (needle moves off scale to the left), reverse
the wires on terminals 1 and 2.
5. Surge protection is recommended on both the phone in and phone out lines. Use
DoorKing phone line surge suppressers (p/n 1877-010) or equivalent.
DSL Filters
: The 1812 has been tested with several different types of DSL services. In most of these
applications, the DSL service did not interfere with the performance or operation of the 1812 system.
However, there may be an affect with some DSL services. With reference to this, the following
modification should correct any problems. Capacitors are DoorKing Part Number 3501-037.
1. Install a .022 uf capacitor across terminals 1 and 5.
2. Install a .022 uf capacitor across terminals 2 and 4.
3. Be sure that the capacitor leads do not short to each other or to the case. We
recommend that these leads be insulated.
1812-065-M-3-07
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