Studio Technologies 44 - Manual (Page 4)

Issue 2, September 2006 Model 44 User Guide
Page 4 Studio Technologies, Inc.
Typical Application
A typical application would be to use the
Model 44 Interface with up to six of the
Model 212 Announcer’s Consoles. The
Model 212 features digital audio inputs and
outputs with support for both AES3id (75
ohm unbalanced) and AES3 (110 ohm bal-
anced) signals. To provide RJ45 interfacing
capability, an EtherCon® interface connec-
tor kit, available from Studio Technologies,
would be installed in one of the spare con-
nector locations on the back of the Model
212. Using jumper wire assemblies three of
the four cable pairs are assigned to Model
212 functions. One pair carries nominal 24
volt DC power from the Model 44 to the
Model 212’s circuitry. Two other pairs are
used to carry AES3 (110 ohm balanced) digi-
tal audio signals to and from the Model 212.
The fourth pair can remain unused, or be
used to implement a special function such
as a remote microphone on/off switch.
Installing and wiring the Model 44 in our
typical application is very simple. Standard
unshielded twisted-pair cable assemblies,
ubiquitous to the computer industry, can
be used to connect the Model 212 units
to the RJ45 jacks on the back panel of the
Model 44. Alternately, ruggedized cable
assemblies can be fabricated using Neutrik®
EtherCon connectors. A second set of six
RJ45 jacks, also located on the Model 44’s
back panel, are used to link the digital audio
input and output signals with other equip-
ment. For example, to interface with the
Riedel® Artist® intercom system would
require only the use of standard Ethernet-
type 4-pair cable assemblies. If the fourth
pair of the interconnecting cables has been
implemented with a Model 212 function,
its signals are accessible using the 25-pin
D-subminiature connector. The “D-sub”
connector, located on the Model 44’s back
panel, is also used for connecting to the
auxiliary 24 volt DC output and the external
24 volt DC input. To complete the installa-
tion typically requires only the power cord
to be connected to the designated source
of AC mains power.
Installation
In this section you will be installing and
interconnecting the Model 44. The one-
rack-space unit will be mounted in an
equipment rack. Connections to the an-
nouncer console units and associated
equipment will be made using twelve RJ45
jacks. Installer-selected input, output, or
control signals can be connected using
pins on the female 25-pin D-subminiature
connector. An external source of 24 volts
DC power can also be connected using
pins on the female 25-pin D-subminiature
connector. The same female 25-pin “D-sub”
is also used to access the auxiliary 24 volt
DC output. AC mains power is connected
by means of a detachable cord set that is
compatible with the Model 44’s 3-pin IEC
320 C14-type inlet connector.
System Components
The shipping carton contains the Model 44
Interface and associated user guide. Units
destined for North America and Japan also
include an AC mains cord. Your dealer or
distributor should provide an AC mains
cord for other destinations.
Locating the Model 44
In most cases the 100 meter cable length
limit for AES3 digital audio signals will
dictate the Model 44’s mounting location.
One cable will link the Model 44 to the
announcer’s console units. A second cable
will connect the Model 44 to the associated
digital audio equipment. Ensure that the