Manual

Issue 1, January 2020 Model 348 User Guide
Page 8 Studio Technologies, Inc.
MODEL 348
INTERCOM STATION
addition, it’s possible that a gooseneck
microphone will be attached via the ¼-inch
jack located on the top surface of the unit.
One or two Ethernet connections will be
made using either standard RJ45 patch
cables or etherCON protected RJ45 plugs.
The Ethernet data connection associated
with the primary RJ45 connector is compatible
with Power-over-Ethernet (PoE). If desired,
an Ethernet connection made to the second-
ary Ethernet connector can provide access
to a redundant Dante network. Or it can be
utilized as an active “loop through” connection
associated with the primary Ethernet connec-
tion. If PoE is not going to be utilized, or a
redundant source of power is desired, a
source of 12 volts DC can be connected by
way of a 4-conductor XLR connector.
A dual-channel or single-channel (dual- or
single-ear) headset can be connected using
a cable-mounted 5-pin male XLR connector.
Alternately, a “computer” headset with a
3.5 mm 4-conductor TRRS plug can be used.
An electret gooseneck microphone that has
an integrated ¼-inch plug can be connected.
One or Two Ethernet Connections
One 1000BASE-T (“GigE”) Ethernet connec-
tion is required for Model 348 operation. If
available and connected to the primary RJ45
connector, this connection can provide both
the Ethernet data interface and power for the
Model 348’s circuitry. A 10BASE-T connection
is not sufficient. A 100BASE-TX connection
may be adequate but not optimal.
A second 1000BASE-T (“GigE”) connection
can be made if redundant Dante is desired.
The Model 348’s network configuration must
be set for redundant for this functionality to be
active. PoE is not supported on the secondary
Ethernet connection. The secondary Ethernet
port can also be used as a “loop through” port
such as would be provided by an Ethernet
switch. This requires that the Model 348’s
network configuration is set for switched.
Switched mode is the default setting but using
the secondary port in this mode for applica-
tions other than troubleshooting is not rec-
ommended. It will function reliably but “daisy
chaining” Ethernet signals can limit flexibility
and present a failure point.
The Ethernet connections are made by way
of two Neutrik etherCON protected RJ45
connectors that are located on the back of
the Model 348’s enclosure. These allow con-
nection by way of cable-mounted etherCON
connectors or standard RJ45 plugs. The
Model 348’s Ethernet interface supports auto
MDI/MDI-X so that a crossover cable is not
required. The Model 348’s primary Ethernet
connection does not enumerate itself as a
specific PoE class. As such, a PoE power-
sourcing-equipment (PSE) port will consider
the device as a class 0 device which could
use up to 12.94 watts of power.
External 12 Volts DC Input
An external source of 12 volts DC can be
connected to the Model 348 by way of the
4-pin male XLR connector which is located on
the back panel. While the requirement for the
external source is nominally 12 volts, correct
operation will take place over a 10 to 18 volt
range. The Model 348 requires a maximum
of 600 milliamperes (0.6 amperes) at 12 volts
DC for correct operation. The DC source
should be terminated to a 4-pin female XLR
connector with pin 1 negative (–) and pin 4
positive (+).
If an external power source is required, the
PS-DC-02 power supply, available as an op-
tion from Studio Technologies, is directly com-
patible with the Model 348. Its AC mains input
allows connection to 100-240 volts, 50/60 Hz
with an output of 12 volts DC, 1.5 amperes
maximum. Its DC output is terminated on a
4-pin female XLR connector.