Manual
Model 45DC User Guide Issue 3, March 2016
Studio Technologies, Inc. Page 9
using a Neutrik etherCON RJ45. If Power-
over-Ethernet (PoE) is available operation
will commence immediately. An external
12 volt DC power source can also be
connected by way of a 4-pin XLR. Party-
line intercom connections are made us-
ing two 3-pin male XLR connectors. The
Model 45DC is housed in a rugged yet
lightweight aluminum enclosure that is de-
signed to be “field tough.” It can be used
as a standalone portable unit, supporting
what’s known in the broadcast world as
“throw-down” applications. Rack-mount
options are also available allowing one or
two units to be mounted in one space (1U)
of a standard 19-inch rack enclosure.
Future Capabilities and
Firmware Updating
The Model 45DC was designed so that its
capabilities can be enhanced in the future.
A USB connector, located on the Model
45DC’s back panel, allows the applica-
tion firmware (embedded software) to be
updated using a USB flash drive. To imple-
ment the Dante interface the Model 45DC
uses Audinate’s Ultimo™ integrated cir-
cuit. The firmware in this integrated circuit
can be updated via the Ethernet connec-
tion, helping to ensure that its capabilities
remain up to date.
Installation
In this section signal interconnections will
be made using the connectors located on
the back panel of the Model 45DC. Con-
nections to one or more party-line user
devices or one or two existing party-line
intercom circuits will be made using the
3-pin 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.
System Components
Included in the shipping carton are the
Model 45DC Intercom Interface and a user
guide. If a rack-mount front panel is going
to be used as part of the installation it will
typically be shipped in a separate carton.
If the installation or specific application
requires an external source of 12 volts DC
it needs to be provided separately. An ap-
plicable power supply, the Studio Technol-
ogies PS-DC-02, is available as an option.
Locating the Model 45DC
The location of the Model 45DC will de-
pend on the length of the cable runs
needed to link the unit with the associated
party-line intercom devices. This type of
circuit carries unbalanced audio which can
be susceptible to interference and cross-
talk issues. And since party-line intercom
circuits typically carry DC power a voltage
drop due to resistive loss can become an
issue. In general, minimizing the length
of the party-line intercom cables will help
ensure more reliable and consistent inter-
com system performance. Of equal impor-
tance is the 100-meter (325-foot) Ethernet
cable limitation. A final location criterion is
to ensure that access to the Model 45DC’s
front panel is available. An optimal loca-
tion will allow convenient use of the auto
null pushbutton and easy observation of
the status and level meters LEDs.
Protecting the Enclosure
The Model 45DC is shipped as a self-
contained unit suitable for portable use