NCI Technologies NCI 100 User Manual - page 3
In accordance with your particular system installation
and requirements, make the following connections at
the terminal block at the right.
A) Pins 1&2 – TEL/MIC (Balanced Input)
Connect to either the telephone system page port,
C.O. port, a telephone set or an external microphone
(600
Ω
balanced - shield to pin 3) to these terminals.
Depending on which source is used, DIP switches
1&2 need to be set accordingly.
This voice input can only be activated by the page
port dry contacts, the VOX circuit, the C.O. port talk
battery circuit or a strap across pins 5 & 6
See installation examples on pages 6.
CAUTION: This input must NOT be connected directly to
the telephone network.
B) Pins 3&4 – MUSIC (Unbalanced Input)
Connect a music source to these terminals noting
that pin 3 is a signal ground pin. Reversed
connection can cause oscillations. It is important that
shielded cable be used to avoid any induced hum.
See installation example F on page 6.
C) Pins 5&6 – MUSIC MUTE
Connect the telephone system page port dry relay
contacts to these pins. This will activate the voice
input of the amplifier and deactivate the music input
(Music mute) thus cutting off the background music.
These pins must be strapped if voice input on pins
1 & 2 is to be permanent.
D) Pins 6&7 - NITE RINGER Activation
Connect N.O. (normally open) dry relay contact
from KSU or PBX to these pins.
E) Pins 8&9 - NITE RINGER Activation
Connect Tip & Ring from Bell C.O. line or phone
system single line port.
1 2 3 4 5 6 7 8 9
OUTPUT
OUTPUT CONNECTIONS
Connect the speaker wiring to the terminal block at the left
marked OUTPUT. Follow the guidelines for Class 2 Wiring
making sure that the total load does not exceed the rated
maximum load as marked on the door of your particular
model amplifier.
NOTE:
To prevent any possible oscillations, ensure that
the speaker wires connected to the output
connector are kept away from any input wiring
connected to the terminal strip described below.
INPUT CONNECTIONS
Input
Connections
3
1
2
3
From
telephone
system
page port
or C.O. port
1
2
3
4
1
2
3
4
5
6
Aux
Tuner or Casette
Output
7
8
Signal Input
Signal Ground
9
1
2
3
4
5
6
Page Control
contacts
7
1
2
3
4
5
6
Dry Contact
7
8
9
Activation from
KSU or PBX
1
2
3
4
5
6
Tip
7
8
9
Activation from
Bell C.O. Line
or Single Line Port
Ring
1
2
3
4
5
6
7
8
9
Balanced
Microphone
A
B
D
C
E
1
2
3
4
5
6
7
8
9
Strap for permanent Voice Input