Samsung NX-308, Programming & Installation Manual

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The lock release mechanism controls door opening only and does not lock the door. The maximum
rating of the control signal connected to the system should be less than the specifications described
above.
Connecting PSTN Lines
NX 308 system operates with loop start C.O. lines which have no polarity. Three loop start C.O. or
PBX lines can be connected to the system.
Telephone company lines should be terminated on an LJU located near the KSU.
Connect PSTN lines to CO1, CO2, and CO3 by connecting the modular plug supplied to the system
PSTN modular jack. The other end of the cable should be connected to the LJU.
Cabling PSTN line cord
RJ11 BT
Connector Connector
Pin 1 Yellow TIP Pin 2
Pin 2 Green Pin 3
Pin 3 Red Pin 4
Pin 4 Black RING Pin 5
Note that the cable for trunk lines (C.O. or PBX lines) should be isolated from the cables for the
stations, preventing signal interference and surge inducement.
Power Failure Transfer
NX-308 system transfers two C.O. lines to the related single line telephones automatically during AC
power failure.
The first trunk line and the second trunk line are transferred to the 7th station and 8th station
respectively only when the stations are assigned to single line telephones.
Trunk 1 to Station 7
Trunk 2 to Station 8
For power failure transfer, you should assign DIP switch S7 on the base board correctly. The DIP
switch includes four levers and each telephone line requires two lever adjustments. Set to the ON
position to enable this feature (Figure 4).
If a facsimile station is installed at the system, assigning the FAX station to one of these ports is useful
because you can receive fax messages regardless of power failure.
AC Power Connection