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3. When the system begins to ring, press [HOLD] to place the first call on hold.
4. Answer the ringing CO line. You should hear the MOH from the previous (now
holding) CO line.
5. Adjust the music level at the source. That is, use the volume control of the radio (or
other music source) to adjust the MOH level to a desirable level.
6. If the music begins to sound distorted do not increase the source level any further.
Rather, adjust the source level down slightly and use the trim POT (labeled VR1) for
further adjustment.
7. If a comfortable desired music level cannot be obtained using these techniques, it is
likely that the music source is not properly matched to the MOH input circuitry. You
may add a 60 ohm matching transformer to properly interface the music source.
14. Loud Bell Control
The system provides a dry contact closure to signal externally powered alerting devices
for any incoming CO Line call. Transferred CO Lines that recall system wide will also
activate the LBC, in the same cadence as for an incoming CO Line ring.
Installation
1. Determine which CO lines should operate the LBC relay. Program each of these lines
separately for LOUD BELL = Y.
2. Cut a length of cable to run from the MDF to the Main Processor Board.
3. Attach a male 1/8 in. phono plug to one end of the cable.
4. Insert the 1/8 in. phono plug into the J8 jack (along the right edge of the Main
Processor Board).
5. Terminate the other end of the cable on an industry standard 66M1-50 block for
interconnection to the loud bell and power source.
6. Terminate the Loud Bell and power supply leads on an industry standard 66M1-50
block.
If using a radio as the music source, place it 5 to 10 feet away from the KSU.
Battery/Power
1/8 in. phono plug
the LBC jack on
Option Module
Figure 3-16: Loud Bell Control Installation
Supply
Bell
DHS-E Installation
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