Manual

Issue 5, December 2018 Model 215 User Guide
Page 12 Studio Technologies, Inc.
Headphone Output
The Model 215’s headphone output is
compatible with stereo or mono head-
phones, headsets, or earpieces. Connect-
ing devices with a nominal impedance
of 100 ohms or greater is preferred. This
shouldn’t prove to be an issue since essen-
tially all of the contemporary devices meet
this recommendation.
Devices are connected to the headphone
output by way of a ¼-inch 3-conductor
phone jack located on the Model 215’s
back panel. As is standard for stereo head-
phones, the left channel is connected to
the tip lead of the ¼-inch headphone jack.
The right channel is connected to the ring
lead of the jack. Common for both chan-
nels is connected to the sleeve lead.
Devices with ¼-inch 2-conductor “monau-
ral” plugs can also be used with the Model
215’s headphone output. In this arrange-
ment only the tip lead (left channel) will
be active. The 2-conductor plug will physi-
cally connect (“short”) the ring lead (right
channel) to the sleeve lead (common).
Technically this won’t damage the circuitry
associated with the right-channel head-
phone output since 10 ohm protection
resistors are electrically in series with the
headphone output circuits.
Ethernet Connection
An Ethernet connection that supports
100BASE-TX is required for the Model
215’s Dante audio-over-Ethernet connectiv-
ity. A 10BASE-T connection is not sufficient
for Model 215 operation. A 1000BASE-T
(“GigE”) connection is not supported
unless it can automatically “fall back”
to 100BASE-TX operation. An Ethernet
connection that supports Power-over-
Ethernet (PoE) is preferred as it will
provide operating power for the Model 215.
For Ethernet with PoE switch (PSE) power
management the Model 215 will enumer-
ate itself as a PoE class 2 device. If PoE is
not available an external 12 volt DC power
source can also be connected. This will be
discussed in the next section of this guide.
The 100 Mb/s twisted-pair Ethernet connec-
tion is made by way of a Neutrik etherCON
protected RJ45 connector that is located
on the back panel of the Model 215. This
allows connection by way of a cable-
mounted etherCON plug or a standard
RJ45 plug. The Model 215’s Ethernet inter-
face supports auto MDI/MDI-X so that most
cabling implementations will be directly
supported.
External 12 Volt DC Input
An external source of 12 volts DC can be
connected to the Model 215 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 215
requires 270 milliamperes at 12 volts DC for
correct operation. The DC source should
be terminated to a 4-pin female XLR con-
nector with pin 1 negative (–) and pin 4
positive (+). Purchased as an option, the
PS-DC-02 power supply is available from
Studio Technologies. Its AC mains input al-
lows connection to 100-240 volts, 50/60 Hz
and its 12 volt DC, 1.5 amperes maximum
output is terminated on a 4-pin female
connector.
As previously discussed in this guide, an
Ethernet connection that provides Power-
over-Ethernet (PoE) can serve as the Model
215’s power source. Alternately, an external
12 volt DC source can be connected. For
redundancy, both PoE and the external