Datasheet

Studio Technologies, Inc. Model 374A Intercom Beltpack, Issue 3, Page 3
The gain of the microphone preamplifier can be selected
from among four choices. These allow compatibility with
a variety of microphones that are part of broadcast and
intercom headsets.
A unique Model 374A feature is the ability to individu
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ally configure the way in which the four talk pushbutton
switches function; four choices are available. For standard
intercom beltpack operation either
Push to Talk or Push to
Talk/Tap to Latch
operation can be selected. For situations
where only monitoring of an intercom channel is desired a
Talk Disabled mode is available. And for advanced monitor-
ing-only situations the
Talk Disabled/Phones Tap to Latch
mode can be selected such that a button will serve in an
audio on/off role.
Four audio channels arrive via Dante and are destined
for the 2-channel headphone output. Each input source
can be independently routed to the left headphone chan
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nel, right headphone channel, or both the left and right
headphone channels. This flexibility allows a variety of
listening environments to be created, including stereo,
single-channel monaural, and dual-channel monaural.
Ethernet Data and PoE
The Model 374A connects to an Ethernet data network
using a standard 100 Mb/s twisted-pair Ethernet inter
-
face. The physical interconnection is made by way of a
Neutrik® etherCON RJ45 receptacle. 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 374A’s operating power is provided by way
of the Ethernet interface using the 802.3af Power-over-
Ethernet (PoE) standard. This allows fast and efficient
interconnection with the associated data network. To
support PoE power management, the Model 374A’s PoE
interface reports to the power sourcing equipment (PSE)
that it’s a class 1 (very low power) device.
Future Capabilities and Firmware
Updating
The Model 374A was designed such that its capabilities and
performance can be enhanced in the future. A USB connec
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tor, located on the unit’s main circuit board (underneath the
unit’s cover), allows the application firmware (embedded
software) to be updated using a USB flash drive.
The Model 374A uses Audinate’s Ultimo™ integrated
circuit to implement the Dante interface. The firmware
in this integrated circuit can be updated via the Ethernet
connection, helping to ensure that its capabilities remain
up to date.