Manual

Model 391 User Guide Issue 2, December 2018
Studio Technologies, Inc. Page 7
The Model 391 includes an audio sounder
whose output will “cut through” ambi-
ent audio to gain the attention of nearby
personnel. The character of the sounder
was selected to be effective at gaining
attention rather than being pleasant. The
overall level range of the sounder can be
configured while the precise value can be
set by the user by way of a rotary potenti-
ometer. The action of the sounder can be
configured from among multiple choices,
including continuous, beep, and pulse.
A delay can also be selected so that the
visual indicator can activate first while the
sounder will enable only after the selected
period of time has elapsed. This could help
prevent users from being annoyed by the
sounder if they are able to quickly respond
to the visual alert.
A unique Model 391 feature is the line
output. Interfaced using a standard 3-pin
XLR audio connector, the balanced analog
line-level output signal is compatible with
inputs on devices such as audio consoles
and amplified speakers. A configuration
choice allows the on/off status of the line
output to be selected. One choice desig-
nates that the line output be active only
when a call signal is received. This al-
lows voice signals to be provided to users
simultaneously with visual and sounder ac-
tivation. The line output can also be config-
ured to be continuously active, acting as a
general-purpose analog output signal from
either of the two Dante input channels.
The Model 391 provides two operating
modes, each with a fully-independent op-
erating configuration. A pushbutton switch
and two associated LED indicators on the
Model 391’s front panel allows observa-
tion and selection of the desired operat-
ing mode. By allowing two independent
configurations the Model 391 can offer two
unique sets of application-specific alerting
conditions. As an example, Mode 1 might
be considered a “rehearsal” mode where
both a bright visual indicator and a loud
sounder output are desired whenever a
call signal is received. Mode 2 could be
configured as a “performance” mode and
enabled whenever an event is actively tak-
ing place. The configuration for this mode
might have the audio sounder disabled
and the intensity, color, and action of the
visual indicator selected to be unobtrusive.
Dante Audio-over-Ethernet
Audio and related data is sent to the Model
391 using the Dante audio-over-Ethernet
media networking technology. As a Dante-
compliant device, the Model 391’s two
input (Dante receiver) audio channels
can be assigned (routed) from source de-
vices using the Dante Controller software
application. The Model 391 is compatible
with Dante digital audio sources that have
a sampling rate of 48 kHz and a bit depth
of up to 24. Two bi-color LEDs provide an
indication of the Dante connection status.
Ethernet Data and PoE
The Model 391 connects to an Ethernet
data network using a standard 100 Mb/s
twisted-pair Ethernet interface. The physi-
cal interconnection is made by way of a
Neutrik® etherCON® RJ45 connector.
While compatible with standard RJ45
plugs, etherCON allows a ruggedized and
locking interconnection for harsh or high-
reliability environments. An LED displays
the status of the network connection.
The Model 391’s operating power is pro-
vided by way of the Ethernet interface us-
ing the 802.3af Power-over-Ethernet (PoE)