3
Operation
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3
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1. Universal AC Power Input: The unit accepts any input power in the range of 100-240 VAC, 50/
60 Hz.
2. Connector to ES-4000A: This connector carries power to the ES-4000A expansion station, and
carries the four audio channels of the ES-4000A. When a telex ES-4000A is connected to the
PS-4001, each of the four channels of auido is “broken out” to the respective channel connec-
tor.
3. Intercom Channel Connectors: These connectors carry power to the intercom system and
provide termination for the audio signal of each individual intercom channel.
4. Channel Status Indicators: The indicators are green for normal operation and red when there is
an overload or short circuit. The circuitry in the unit will automatically reset when the overload
or short circuit is located and fixed, and the LED will go back to green..
5. BAL / UNBAL Selector Switch: This selector switch allows the user to configure the unit for
use in either an Audiocom® (BALANCED) or Clear-Com (UNBALANCED) system. Com-
patibility includes channel connector pin-outs, channel power requirements, and call signaling
requirements. The default setting for this switch is in the Audiocom® (BAL) position.
