Datasheet
RJ45 connector. While compatible with standard RJ45
plugs, etherCON allows a ruggedized and locking inter
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connection for harsh or high-reliability environments. The
Model 44D’s operating power can be provided by way of
the Ethernet interface using the Power-over-Ethernet (PoE)
standard. This allows fast and efficient interconnection
with the associated data network. To support PoE power
management, the Model 44D’s PoE interface reports to the
power sourcing equipment (PSE) that it is a class 1 (very
low power) device. The unit can also be powered using an
external source of 12 volts DC. Four LEDs on the back
panel display the status of the network connection, Dante
interface, and PoE power source.
Simple Installation
The Model 44D uses standard connectors to allow fast
and convenient interconnections. An Ethernet signal
is connected 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 connector. Line input
and line output connections are made using 3-pin XLR
connectors. A 9-pin female D-subminiature (DE-9F) con
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nector provides access to the two GPI, two GPO, and
auxiliary DC output functions. The Model 44D is housed in a
rugged yet lightweight aluminum enclosure that is designed
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 44D was designed so that its capabilities can
be enhanced in the future. A USB connector, located on
the unit’s main circuit board (underneath the unit’s cover),
allows the application firmware (embedded software) to be
updated using a USB flash drive.
To implement the Dante interface the Model 44D uses
Audinate’s Ultimo™ integrated circuit. The firmware in this
integrated circuit can be updated via the unit’s Ethernet
connection, helping to ensure that its capabilities remain
up to date.
Power Sources:
Power-over-Ethernet (PoE): class 1 (very low power,
≤3.84 watts) per IEEE 802.3af
External: 10 to 18 volts DC, 0.3 amp maximum at
12 volts DC
Network Audio Technology:
Type: Dante audio-over-Ethernet
Bit Depth: up to 24
Sample Rates: 44.1 and 48 kHz
Number of Receiver (Input) Channels: 2
Number of Transmitter (Output) Channels: 2
Dante Audio Flows: 4; 2 receiver, 2 transmitter
Network Interface:
Type: twisted-pair Ethernet, Power-over-Ethernet (PoE)
supported
Data Rate: 100 Mb/s (10 Mb/s not supported;
1000 Mb/s “GigE” Ethernet not supported unless
falls back to 100 Mb/s)
Line Inputs: 2
Type: analog, electronically balanced, capacitor coupled
Impedance: 20 k ohms, nominal
Nominal Level: +4 dBu, reference –20 dBFS or 0 dBu,
reference –18 dBFS, configurable
Specifications
Maximum Level: +24 dBu when configured for +4 dBu
nominal, +18 dBu when configured for 0 dBu nominal
Dynamic Range: >114 dB, A-weighted
Distortion (THDS+N): <0.002% (–95 dB), measured
at –1 dBFS, 22 kHz bandwidth
Frequency Response: +0.0 dB/–0.5 dB, 20 Hz to
20 kHz; 10 kHz low-pass filters disabled
Low-Pass Filters: –3 dB @ 10 kHz, –55 dB @ 20 kHz,
configurable on or off in tandem with line output filters
Line Outputs: 2
Type: analog, electronically balanced, capacitor coupled,
intended to drive balanced or unbalanced loads of 2 k
ohms or greater.
Source Impedance: 200 ohms
Nominal Level: +4 dBu, reference –20 dBFS, or0 dBu,
reference –18 dBFS, configurable
Maximum Level: +24 dBu when configured for +4 dBu
nominal, +18 dBu when configured for 0 dBu nominal
Dynamic Range: >114 dB, A-weighted
Distortion (THDS+N): 0.003% (–90 dB), measured at
–1 dBFS, 22 kHz bandwidth
Frequency Response: ±0.1 dB, 20 Hz to 20 kHz, 10 kHz
low-pass filter disabled
Low-Pass Filters: –3 dB @ 10 kHz, –55 dB @ 20 kHz,
configurable on or off in tandem with line input filters
Studio Technologies, Inc. Model 44D Audio Interface, Issue 3, Page 4