Zeta Alarm Systems.
ZNDC Installation and Operation Manual
Revision 1.0
Part # MAN-ZNDC-01
Page 11
3.5
Connecting Phone Lines
Connect ZNDC to phone lines using two RJ45 cables. The RJ45 cables should be standard 8-wire
cables. Connectors and crimps are included in the RJ45 Kit, or may be obtained independently.
See Illustration 4.5B for connector wiring diagram. The RJ45 cables will plug into the wall via
RJ31X jacks, which are installed by the phone company. There will need to be one RJ31X jack for
each phone line.
Pins 1 and 8 (“R1” and “T1”) of the RJ31X jack connect to Network (or, House) phone lines. Pins 4
and 5 (“R” and “T”) connect to the Telco (or, external) phone lines. When nothing is plugged into
the jack, shorting bars inside the jack will connect the incoming Telco lines to the Network Lines.
When the ZNDC is connected, the RJ45 plug will open the shorting bars inside the jack, allowing
the phone lines to run from the Telco lines, through the ZNDC, and out to the Network. When the
ZNDC needs to send an event, it will “seize” the phone line by disconnecting the Telco signals
from the Network. It will restore the connection when the event reporting is complete.
Figure No. 3.5A
1
2
3
4
5
6
7
8
T1
R1
T
R
To
TEL C O
L ine s
(Ou tsid e
W irin g)
To
N etw ork
(H o use
Lin es)
RJ31X JACK 1
6
T o
N e two rk
(H ou se
L in es)
R
T
3
2
1
4
5
R1
T1
To
TELC O
Lin es
(O utside
Wiring )
RJ31X JACK 2
7
8
(Secondary Lines)
(Primary Lines)
RJ45
MALE PLUG
CONNECTORS
Note:
RJ31X Jacks provided by telephone company. Shorting
bars inside RJ31X jacks rem ove during male plug insertion.
Wiring Phone Jacks
Illus. 3.5A
J1
Line 2
Line 1
Modular Female
Connectors
NDC
Wiring Phone Jacks
Illus. 3.5A
