User Guide

Issue 4, February 2021 Model 374A User Guide
Page 14 Studio Technologies, Inc.
MODEL 374A
INTERCOM BELTPACK
Model 374A’s Dante configuration set-
tings should have been selected using the
Dante Controller software application. In
this way the unit’s four audio output chan-
nels (Dante transmitter channels) and four
audio input channels (Dante receiver chan-
nels) should have been routed, by way of
Dante “subscriptions,” to the receiver and
transmitter channels on associated Dante-
enabled equipment.
Initial Operation
The Model 374A will start to function
as soon as a Power-over-Ethernet (PoE)
power source is connected. However, it
may take 20 to 30 seconds for full opera-
tion to commence. Upon initial power up
the three status LEDs located on the bot-
tom panel below the etherCON RJ45 re-
ceptacle will begin to light as network and
Dante connections are established. The
green and orange LEDs that illuminate the
four pushbutton switches on the top panel
may initially light randomly and then will
light in a test sequence to indicate that the
application firmware (embedded software)
has started. Once the entire sequence has
completed and the Dante connection has
been established full operation will begin.
Ethernet and Dante Status
LEDs
Three status LEDs are located below the
etherCON RJ45 receptacle on the Model
374A’s bottom panel. The LINK ACT LED
will light green whenever an active connec-
tion to a 100 Mb/s Ethernet network has
been established. It will flash in response
to Ethernet data packet activity. The SYS
and SYNC LEDs display the operating sta-
tus of the Dante interface and associated
network. The SYS LED will light red upon
Model 374A power up to indicate that the
Dante interface is not ready. After a short
interval it will light green to indicate that it
is ready to pass data with another Dante
device. The SYNC LED will light red when
the Model 374A is not synchronized with
a Dante network. It will light solid green
when the Model 374A is synchronized
with a Dante network and an external
clock source (timing reference) is being
received. It will slowly flash green when
this specific Model 374A is serving as the
Leader clock for the network. It’s possible
that up to 30 seconds may be required for
the SYNC LED to reach its final state.
Compressor Active LED
A yellow LED indicator is located on the
bottom panel adjacent to the headset con-
nector. Labeled COMP, the LED displays
the status of the microphone audio com-
pressor function. It will light whenever the
input level from the microphone, along
with the configured preamplifier gain, is
such that the dynamic range of the talk
signal is being controlled. It’s perfectly
acceptable for this LED to light intermit-
tently whenever a user is talking at a
normal voice level into the associated
microphone. But if the COMP LED lights
solid while a user is talking at a normal
voice level this will typically indicate that
the mic preamp gain setting should be
reduced. Conversely, if the COMP LED
almost never lights when normal talking
is taking place, it’s possible that changing
the mic preamp gain to the higher setting
would be beneficial. Note that due to the
design of the circuitry the compressor ac-
tive LED will function whether or not any
of the four talk channels are active.