Manual

Model 391 User Guide Issue 2, December 2018
Studio Technologies, Inc. Page 5
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 detec-
tion 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 ac-
tivate 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 applica-
tion is used to select from a wide range of
operating choices. The compact, 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.
The Model 391 is directly compatible with
the call signals generated by the popular
Studio Technologies’ Model 370A and
Model 371A Intercom Beltpacks. These
Dante-connected user devices generate
20 kHz tones whenever their call button is
pressed. Model 391 applications 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 compatible 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 and
Model 371A.
Figure 1. Model 391 Dante Alerting Unit front and back views