Getting Started - Studio Technologies 373A User Manual

from among three choices: Push to Talk, Latching, or
Push to Talk/Tap to Latch. Two audio channels arrive
via Dante receivers (inputs) and are destined for the
2-channel headphone output. Each input source can
be independently routed to the left headphone chan-
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.
Note that the left headphone output is sent to both
the 4-pin male XLR connector (Headset A) and the
3.5 mm 4-conductor TRRS jack (Headset B). Howev-
er, the right headphone output channel only connects
to the 3.5 mm 4-conductor TRRS jack (Headset B).
Ethernet Data and PoE
The Model 373A connects to an Ethernet data net-
work using a standard 100 Mb/s twisted-pair Ethernet
interface. The physical interconnection is made
by way of a Neutrik etherCON RJ45 jack. While
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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 373A'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 373A'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 373A was designed such that its capabili-
ties and performance can be enhanced in the future.
A USB receptacle, located on the unit's main circuit
board (underneath the unit's cover), allows the appli-
cation firmware (embedded software) to be updated
using a USB flash drive.
The Model 373A uses Audinate's Ultimo™ integrated
circuit to implement the Dante interface. The firmware
in this integrated circuit can be updated via the Ether-
net connection, helping to ensure that its capabilities
remain up to date.
Model 373A User Guide
Studio Technologies, Inc.
Model 373A
INTERCOM BELTPACK

Getting Started

What's Included
Included in the shipping carton are a Model 373A
Intercom Beltpack and a printed copy of this guide.
As a device that is Power-over-Ethernet (PoE) pow-
ered, no external power source is provided. In most
applications an Ethernet switch with the required PoE
capability will be utilized.
Connections
In this section, signal interconnections may be made
using the three connectors located on the bottom of
the Model 373A's enclosure. An Ethernet data con-
nection with Power-over-Ethernet (PoE) capability will
be made using either a standard RJ45 patch cable
or an etherCON protected RJ45 plug. A monaural
(dual- or single-ear) headset will be connected using
a cable-mounted 4-pin female XLR connector. Alter-
nately, a stereo headset with a 3.5 mm 4-conductor
TRRS plug can be used. (The headset's plug needs
to follow the CTIA™/AHJ configuration standard.)
Ethernet Connection with PoE
A 100BASE-TX Ethernet connection that supports
Power-over-Ethernet (PoE) is required for Model
373A operation. This one connection will provide
both the Ethernet data interface and power for the
Model 373A's circuitry. A 10BASE-T connection is
not sufficient and a 1000BASE-T (GigE) connection
is not supported unless it can automatically "fall back"
to 100BASE-TX operation. The Model 373A supports
Ethernet switch power management, enumerating
itself as a PoE class 1 device. Any source that is
compliant with the IEEE
tion correctly. Should the selected Ethernet switch
port support Energy-Efficient Ethernet (EEE) it must
be disabled to help ensure reliable Dante operation.
The Ethernet connection is made by way of a Neutrik
etherCON protected RJ45 jack that is located on the
bottom of the Model 373A's enclosure. This allows
connection by way of a cable-mounted etherCON
connector or a standard RJ45 plug. The Model 373A's
Ethernet interface supports auto MDI/MDI-X so that
a crossover cable is not required.
Headset Connections
The Model 373A allows two different types of head-
sets to be connected. A 4-pin male XLR connector is
802.3af standard will func-
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Issue 2. June 2023
Page 7