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Highlights
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Standard RJ45 connectors
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Individual current-limited DC outputs
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Redundant internal power supplies
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Universal mains input powering
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Single rack-space mounting
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Six independent circuits
Introduction
The Model
44 is designed to work with 200-series announcer’s console products from
Studio Technologies. The unit serves as an interconnection “hub,”
providing power and signal routing for up to six announcer’s consoles.
The Model 44 is appropriate for in-studio as well as field broadcast
applications. Of special note is its applicability for use in the live
television sports industry. The compact, one-rack-space enclosure is
constructed using heavy-gauge steel components.
For
installation simplicity the Model 44 connects to the announcer’s
consoles using Ethernet-type twisted-pair cable assemblies. Each of the
Model 44’s six channels connects to its associated announcer’s console
using an RJ45 jack. Of the four pairs in the jack, two are intended for
transmission of digital audio signals. A third pair can be used to carry
digital or analog audio signals, as well as being used for special
installation-specific applications. The fourth pair is used to carry 24
volt DC, 150 milliamperes nominal maximum, to the announcer’s console.
The power provided by each of the Model 44’s six channels is
individually over-current and short-circuit protected. This minimizes
the chance that an error on one channel will impact the others.
A second
set of six RJ45 jacks provides access to two pairs from the announcer’s
consoles’ RJ45 jacks. These jacks are normally used to connect the
digital audio input and output signals to the main broadcast system
equipment, such as a digital matrix intercom system, an audio console,
or a routing switcher. The Model 44 also provides a 25-pin
D-subminiature connector that is used to provide access to a third cable
pair from the announcer’s consoles’ RJ45 jacks.
The
unit’s mains power input can be in the range of 100 to 230 volts, 50/60
hertz. This “universal input” ensures correct operation virtually
anywhere in the world. Two 24 volt nominal, 30 watt internal power
supplies provide redundancy for critical broadcast applications. For
special applications an external source of 24 volts DC can also be
connected. This allows, for example, battery operation of the Model 44
and associated announcer’s consoles. Three LED indicators, located on
the unit’s front panel, provide status indication of the two internal
and one external power sources. For special applications the Model 44
provides a nominal 24 volt, 70 milliamperes nominal maximum power
source. This source could be useful when connecting devices such as
“tally” status indicators.
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 balanced) signals. To provide RJ45 interfacing
capability, EtherCon® interface connector kits, available from
Studio Technologies, would be installed in one of the spare
connector 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) digital 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 equipment. For example, to interface with
the Riedel® Artist® intercom system would require only the use of
standard 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 a 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
installation requires only the power cord to be connected to the
designated source of AC mains power.
Model
44 Specifications
Applications:
designed
to work with up to six Model 200-series announcer’s consoles from Studio
Technologies
Announcer’s Console Power Sources:
6
24 volts DC nominal (26 volts actual with internal power supplies
active), 150 milliamperes nominal maximum; over-current and short-circuit protected
Interconnection Cable Limit:
designed
to correctly support 200-series announcer’s consoles located up to 100
meters from Model 44 when using standard computer-type unshielded
twisted-pair cabling
Auxiliary 24 Volt DC Output:
24 volts
DC nominal (26 volts actual with internal power supplies active), 70
milliamperes nominal maximum; over-current and short circuit protected
External 24 Volt DC Input:
24 volts
nominal (24-28 volts acceptable), 1.2 amperes minimum
Connectors:
Announcer’s Console: 6, RJ45 (8-position modular)
System: 6, RJ45 (8-position modular)
Aux In/Out, Aux 24 Volt DC Output, External 24 Volt DC Input:
25-pin D-subminiature female, 4-40 threads
AC Mains: 3-blade, IEC 320 C14-compatible (mates with IEC 320 C13)
AC Mains Requirement:
100-230
volts, 50/60 Hz, 0.8 A maximum @ 100 volts, 0.5 A maximum @ 230 volts
Dimensions (Overall):
19.00 inches wide (48.3 cm)
1.72 inches high (4.4 cm)
9.58 inches deep (24.3 cm)
Mounting:
one space in a standard 19-inch rack
Weight:
6.3 pounds (2.9 kg)
Specifications
subject to change without notice.
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