ASL INTERCOM BS 217 Посібник користувача - Сторінка 5
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The power supply is fully protected against wiring mistakes (reverse power), short circuit
or dangerous thermal condition. Should one of these conditions occur, the unit shuts
down. Once the fault condition has been removed, the unit resets automatically and
power is restored.
Each channel has a Volume control, a TALK and a CALL button with LED indicators.
With side tone trimmers one adjusts the listen level of one's voice in one's headset.
With a headset connected to the XLR-4 headset connector one can talk and listen to each
channel separately or to both channels simultaneously.
The unique ASL Call system provides both a flashing red LED and a very distinctive sound
signal. A slight touch of the CALL button makes the call LED flash, whilst holding the button
for 2 seconds the call sound signal is activated.
An Aux input connector with Ground Lift switch at the rear panel allows injecting external
line level audio signals into the intercom lines.
Special attention has been paid to the intelligibility of speech. By applying low noise/high
speed circuitry, a speech presence filter and a specially designed headphone amplifier,
communication is very comfortable even in environments with high background noise
levels.
3.0
MECHANICAL INSTALLATION
For the BS 217 a vertical rack space of 1RU (1.75", 44mm) is required. It is not necessary
to provide rear support by extra bracing or shelving. Adequate ventilation must be pro-
vided by allowing sufficient space around the sides and rear of the unit to ensure free
circulation of air. Forced cooling is not required.
The power supply regulator is mounted on the rear of the unit; after a period of time it
will feel hot to the touch. This is quite normal, and should be no cause for alarm.
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