Manual

Issue 3, August 2018 Model 44D User Guide
Page 10 Studio Technologies, Inc.
line outputs will be made using 3-pin male
and female XLR connectors. An Ethernet
data connection will be made using either
a standard RJ45 patch cable or an ether-
CON protected RJ45 plug. A 4-pin XLR
connector allows the connection of an
external source of 12 volts DC. Interfacing
with the GPI, GPO, and auxiliary DC out-
put functions can be made using a 9-pin
female D-subminiature (DE-9F) connector.
System Components
Included in the shipping carton are the
Model 44D Interface and a printed copy
of this guide. If a rack-mount front panel
is going to be used as part of the installa-
tion it will typically be shipped in a sepa-
rate carton. If the installation or specific
application requires an external source of
12 volts DC it needs to be provided sepa-
rately. A compatible power supply, the
Studio Technologies’ PS-DC-02, is avail-
able as an option.
Locating the Model 44D
The location of the Model 44D will primar-
ily depend on being within the 100-meter
(325-foot) twisted pair Ethernet cable limi-
tation. But that can be overcome by us-
ing a fiber-optic interconnect between the
Model 44D-related Ethernet switch and the
other Ethernet switches in the local-area-
network (LAN). The analog line input and
line output connections, typically being
wired as a differential (balanced) pair with
shield, can support lengthy cable runs
with negligible impact on audio quality.
Protecting the Enclosure
The Model 44D is shipped as a self-
contained unit suitable for portable
use or placement in a semi-permanent
location. Installed on the bottom of the
chassis are screw-on “bump on” protec-
tors (also known as “rubber feet”). These
are useful if the unit is going to be placed
on surfaces where scratching of either the
Model 44D or the surface material could
take place. The “feet” can be removed,
without the use of a tool, when rack- or
custom-mounting the unit.
Rack Mounting the Model 44D
For permanent or mobile applications it
might be desirable to mount one or two
Model 44D units into one space (1U)
of a 19-inch rack enclosure. A range of
rack-mount front panels, each purchased
separately, are available from Studio Tech-
nologies. The following provides details
on how to install Model 44D units to these
panels.
To attach a Model 44D unit to the single-
unit rack-mount panel, begin the process
by using a 5/64-inch hex wrench to re-
move the four 6-32 thread button-head
cap screws that hold the standard front
panel to the chassis. Note that the screws
might be quite tightly affixed. Ensure that
a good-quality hex wrench is used and
press and hold it firmly into each screw
head while turning counterclockwise. Un-
less this recommendation is followed the
hex wrench could “cam out” and the head
could be damaged (“stripped”).
Using the screws that were just removed,
attach the rack-adapter front panel to the
Model 44D’s chassis. To prevent damage
care is required when aligning the front
panel with the LEDs that protrude slightly
through both the Model 44D’s chassis
and front panel. Tighten the four screws
only after a careful inspection ensures
that all of the LEDs protrude through the