Manual

Model 44D User Guide Issue 3, August 2018
Studio Technologies, Inc. Page 11
front panel without interference. To allow
vertical clearance in the associated rack,
remove the four “bump on” protectors
from the bottom of the chassis. They
are removed by using the fingers to
rotate them counterclockwise; no tool
is required. It’s probably a good idea to
carefully protect and store the standard
front panel, along with the “bump on”
protectors, for possible later use.
Mounting a Model 44D to a dual-unit rack-
mount panel follows the same procedure
but will apply to two units. Store both of
the removed standard front panels and
the eight “bump on” protectors for possi-
ble later use. Note that on the rack-panel’s
graphics the Model 44D unit that’s on the
left is designated as A while the unit on
the right is designated as B. This is pro-
vided so that each can be easily identified
during installation, troubleshooting, and
operation.
Once the desired one or two Model 44D
units have been installed in a rack-mount
front panel, the assembly can be mounted
into the designated equipment rack.
One space (“1U” or 1.75 vertical inches)
in a standard 19-inch equipment rack
is required. Secure the front panel into
the equipment rack using two mounting
screws per side.
Ethernet Connection
An Ethernet connection that supports
100BASE-TX (100 Mb/s over twisted-pair)
is required for the Model 44D’s Dante
audio-over-Ethernet connectivity. A
10BASE-T connection is not sufficient
for Model 44D 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 pro-
vide both data and operating power for
the Model 44D. To support power man-
agement functionality on an associated
PoE switch (PSE) the Model 44D will
enumerate itself as a PoE class 1 (very
low power) device. If PoE is not available
an external 12 volt DC power source can
be connected. This will be discussed in a
later sub-section of the guide.
The 100BASE-TX Ethernet connection
is made by way of a Neutrik etherCON
protected RJ45 connector that is located
on the back panel of the Model 44D. This
allows connection by way of a cable-
mounted etherCON plug or a standard
RJ45 plug. The Model 44D’s Ethernet
interface supports auto MDI/MDI-X and,
as such, using a crossover or “reversing”
cable will not be required.
External 12 Volt DC Input
An external source of 12 volts DC can be
connected to the Model 44D by way of a
4-pin male XLR connector which is located
on the back panel. While the require-
ment for the external source is nominally
12 volts, correct operation will take place
with any source that has a range of 10 to
18 volts DC. The Model 44D requires 300
milliamperes maximum 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
allows connection to a 100-240 volts,
50/60 Hz source and its 12 volt DC, 1.5
amperes maximum output is terminated
on a 4-pin female connector.