Datasheet

50660-0320, Issue 3
Model 391 Dante
®
Alerting Unit
The Model 391 is directly compatible with the call signals generated
by the popular Studio Technologies’ Dante-enabled beltpacks and
intercom stations. These Dante-connected user devices generate
20 kHz tones whenever their call button is pressed. Model 391 ap
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plications can also employ the Studio Technologies’ Model 45DC or
Model 45DR Intercom Interface units to provide compatibility with
legacy analog PL intercom systems. The Model 45DC is compat
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ible with Clear-Com® PL circuits that use a DC voltage to indicate
call activity. The Model 45DR supports the TW-series PL intercom
circuits from RTS® which directly use 20 kHz tones for call activity.
Both interfaces will convert the associated analog PL circuit’s audio
and call signals to Dante digital audio. Once in the Dante “world”
the call signals and user audio is compatible with the Model 391
Dante Alerting Unit as well as user beltpacks such as the Model
370A, Model 371A, and Model 374A. In addition, the Model 348
Intercom Station can send and receive compatible call signals.
Applications
The most-typical application for the Model 391 is to alert users that
a call signal on an intercom channel is active. Some technicians
and engineers associated with theater, entertainment, and corpo
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rate events won’t always stay “on headset” and may need to be
alerted when their presence on the production’s intercom system
is needed. As an example, a front-of-house audio mixer could find
value by placing a Model 391 unit on their audio console or associ
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ated equipment rack. They would then be able to quickly respond
to an intercom call request while not having to continuously wear
a headset that would interfere with their normal work.
The Model 391 can also be used as a general-purpose status indi
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cator for various live-event applications. Instead of responding to
intercom call signals, the STcontroller application can be used to
Introduction
The Model 391 Dante Alerting Unit builds on the limited capabilities
of the “beacon” or “strobe” devices that are ubiquitous with analog
party-line (PL) intercom systems and adds a broad range of new
and enhanced features. The Model 391 responds to audio “call”
signals that are present in the unit’s Dante audio input channels.
With an 18-23 kHz detection range, it will detect tone call signals
that are commonly utilized in both legacy analog and modern digital
PL intercom circuits.
Upon detecting a call signal the Model 391 can provide a visual
indicator, enable an audio sounder output, and even activate an
analog line output. Each of the Model 391’s alerting resources
can be individually optimized to meet the unique requirements of
many applications. The STcontroller personal computer application
is used to select from a wide range of operating choices. The com
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pact, portable unit is compatible with Dante audio-over-Ethernet
installations and requires only an Ethernet connection with Power-
over-Ethernet (PoE) capabilities for operation. Typically applications
will find the Model 391 applicable for use in theater, sports, and
broadcast facilities.
Key Features
• Dante audio-over-Ethernet technology
• Compatible with Studio Technologies’ Dante beltpacks
• Responds to standard 20 kHz call signals
• Visual and audio call indications
• General-purpose analog line output
• Configured using STcontroller application
• Power-over-Ethernet (PoE) powered