Clear-Com ICS-21, Instruction Manual

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I C S - 2 1 / 2 1 D T S P E A K E R S T A T I O N
1 - 1
OPERATION
DESCRIPTION
The Clear-Com ICS-21/21DT speaker station is designed for use in theatres, live
performances, industrial environments, and small television facilities. It features
excellent speech intelligibility, even in high noise levels, and can be customized
through its programmable options.
The talk button operates in momentary mode. The integral microphone and
speaker offer half-duplex communication. The ICS-21/21DT offers both visible
and audible call signaling to attract the attention of operators.
A balanced program input allows the monitoring of external audio through the
speaker. This program input can also be used as a paging function.
The integral speaker’s volume level can be adjusted using a front-panel knob. An
internal control allows setting a minimum speaker level. An automatic speaker
switching circuit will quiet the speaker when the talk button is activated.
The ICS-21/21DT is powered locally. In permanent wall installations, a 16-VAC
doorbell transformer will provide a convenient source of power. In DT-Box
installations, a 14- to 18-VAC wall-mounted transformer will suffice. The
connections to this transformer are made to the circuit board’s two-terminal,
plug-on connector. The unit mounts either in a standard four-gang electrical
outlet box or in an optional Clear-Com DT-Box. The extra-thick front panel and
compact, surface-mounted circuitry results in a reduced size and lighter weight
package that maintains Clear-Com ruggedness. The Matrix frame connects to an
eight-wire modular jack.
OPERATION
Normal operation of the ICS-21/21DT speaker station only requires access to
the front-panel controls. The controls located elsewhere on the unit are intended
to be set-and-forget in nature. For intercom operation, set the intercom-level
control to the desired level and press the talk button when talking.
FRONT PANEL
The controls, indicators, and connectors on the ICS-21/21DT front panel are
shown in Figure 1 on page 1-2 and are described in the text that follows.
Talk Button and Light
This momentary-action button activates the panel microphone so that audio is
transmitted to the answer-back label or the programmed station/interface talk
label. This light must be on for audio to be transmitted. It lights when the talk
button is held.
• The ICS-21/21DT offers
simple operation.
• Fully operational from the
front panel.
• Features include a talk
button, answer-back
facility, and program-level
control.
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