Manual
Model 391 User Guide Issue 2, December 2018
Studio Technologies, Inc. Page 9
or an etherCON protected RJ45 plug. If
desired, the Model 391’s analog line-level
output may be interfaced with other equip-
ment using a cable terminated with a stan-
dard 3-pin female XLR connector.
Ethernet Connection with PoE
A 100BASE-TX Ethernet connection that
supports Power-over-Ethernet (PoE) is
required for Model 391 operation. This one
connection will provide both the Ethernet
data interface and power for the Model
391’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 391 supports Ether-
net switch power management, enumerat-
ing itself as a PoE class 1 device.
The Ethernet connection is made by way
of a Neutrik etherCON protected RJ45
connector that is located on the back of
the Model 391’s enclosure. This allows
connection by way of a cable-mounted
etherCON connector or a standard RJ45
plug. The Model 391’s Ethernet interface
supports auto MDI/MDI-X so that a “cross-
over” or “reversing” cable will never be
required.
Ethernet Connection without PoE
As previously discussed in this guide, the
Model 391 was designed such that the
Ethernet connection will provide both data
and Power-over-Ethernet (PoE) power.
There may be situations where the asso-
ciated Ethernet switch does not provide
PoE power. In such cases an external PoE
midspan power injector can be used. If the
selected midspan power injector is 802.3af-
compatible it should function correctly.
Midspan units are available from a variety
of sources, including many online retailers.
Line Output
A cable-mounted 3-pin female XLR connec-
tor is used to interface with the Model 391’s
line-level analog output. The electronically-
balanced output has a nominal level of
0 dBu with significant headroom. It allows
connection to a variety of amplified speak-
ers, audio consoles, wired or wireless IFB
systems, etc.
Dante
Configuration
For call signaling tones and audio signals
to pass to the Model 391, several Dante-
related parameters must be configured.
These configuration settings will be stored
in non-volatile memory within the Model
391’s circuitry. Configuration will typically
be done with the Dante Controller software
application which is available for download
free of charge at www.audinate.com. Ver-
sions of Dante Controller are available to
support Windows and OS X® operating
systems. The Model 391 uses the Ultimo
integrated circuit to implement the Dante
architecture. The Model 391 can also be
configured to meet the requirements of the
AES67 standard. This requires a setting to
be enabled within the Device Info section
of the Dante Controller application.
Audio from one or two Dante transmitter
(Tx) channels can be routed to the Model
391’s two Dante receiver (Rx) channels.
(The Model 391 does not have any Dante
transmitter (output) channels.) The trans-
mitter channel(s) on associated equipment
are used to supply the Model 391 with the
call signaling tones and, if applicable, the
audio signals to be sent to the unit’s line
output. Some applications will need only