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2. To make party line 1 connection, connect GREEN conductor of incoming and
outgoing cable's 18 AWG twisted pair GREEN ,WHITE/ GREEN to L1 and
WHITE/GREEN conductor to L2 terminal at location identified as PARTY 1 be-
tween terminal blocks L1 and L2.
3. For party line 2 connection, connect BROWN conductor of twisted pair BROWN,
WHITE/BROWN to L1 and WHITE/BROWN conductor to L2 terminal at PARTY
2. For party line 3, connect ORANGE conductor of ORANGE, WHITE/ORANGE
twisted pair to L1 and WHITE/ORANGE to L2 at PARTY 3. For party line 4,
connect VIOLET conductor of twisted pair VIOLET, WHITE/VIOLET to L1 and
WHITE/VIOLET to L2 at location PARTY 4 and for party line 5, connect con-
ductor GRAY to L1 and WHITE/GRAY to L2 terminals at PARTY 5 location.
d. Paging Speaker Connection
As output to the speaker from the speaker amplifier of the SelectFone station is less then 11
volts RMS, the speaker wires falls into CLASS II of the NEC code and, hence, conduit is not
required except for mechanical protection. To minimize power loss in the speaker cable, the
length of the speaker cable should be as short as possible. The table in this section shows the
wire size and corresponding maximum length of speaker cable allowed to maintain a cable
power loss under 20% (1db).
As shown in the Figure 1, the connection to the 8 ohm or 16 ohm paging speaker is made at
the terminal block marked JP2. Using 18 AWG twisted pair cable connect -VE terminal of
the speaker to the terminal marked C at the terminal block JP2 and connect +VE of the
speaker terminal to the terminal marked 8 for 8 ohm impedance speaker or to the terminal
marked 16 for 16 ohm impedance speaker.
It is recommended that when the Push-to-Page switch is pressed, the paging speaker con-
nected to that station is silenced (muted) to prevent acoustic feedback to the handset micro-
phone. This is why there is a jumper placed between terminals marked IN and OUT of the
terminal block marked JP2. This does not prevent the speaker connected to the muted station
from announcing the paging messages originated at other stations while channel line conver-
sations are being carried out at the muted station.
Removing the jumper between IN and OUT terminals will disable the mute feature.
Wire Size
#18 AWG
#16 AWG
#14 AWG
e. Line Balance Assembly Connection
One line balance assembly Model SF-1000LB must be installed with each SelectFone sys-
tem. It should be located at the electrical center of the system. The line balance assembly
properly loads the page line and all channel line circuits. Locate the line balance assembly
unit within 12 inches of the SelectFone station located at the electrical center of the intercom
system. See Fig. 6.
1. Remove the cover by loosening the four screws.
2. Place the rear of the housing against the mounting surface. Using the four mount-
ing holes located in each corner of the enclosure as a template, scribe mounting
hole locations on the mounting surface.
8 OHM output
75 FEET(25 M)
120 FEET (35 M)
200 FEET (60 M)
-7-
16 OHM Output
150 FEET (50 M)
240 FEET (75 M)
400 FEET (120 M)
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