Datasheet
Studio Technologies, Inc. Model 5205 Interface, Issue 2, Page 2
5205 can’t reside within an equipment rack or be mounted,
using optional brackets, underneath a table or on-air studio
set. In a conference room setting the unit can be permanently
connected to a PoE-enabled Ethernet port, ready to accept a
signal source from various user-provided devices.
Mic/Line Inputs
Two microphone or line-level analog audio signals can be
connected to the Model 5205’s 3-pin female XLR connectors.
The preamplifier gain of each channel can be independently
adjusted from among six settings: 0 (line), 20, 30, 40, 50, or
60 dB. To support condenser microphones P48 phantom power
can be independently selected as required for each channel.
LEDs are provided to display the configuration of the gain and
P48 phantom power functions.
Six pushbutton switches, located on the Model 5205’s front
panel, allow local selection of the preamplifier gain and P48
phantom power on/off status. The STcontroller application
allows personal computer users to both view and change the
gain of the preamplifiers and the on/off status of the P48
phantom power sources.
Audio Quality
The Model 5205’s audio performance is very good. The low-
noise, wide dynamic-range preamplifier circuitry ensures
that input audio quality is preserved. The outputs of the pre
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amplifiers are routed to high-performance analog-to-digital
conversion (ADC) sections that support sampling rate of
44.1, 48, 88.2, and 96 kHz with a bit depth of 24. A preci-
sion voltage-reference integrated circuit supports the ADC
circuitry in performing accurate signal conversion. The audio
signals, now in the digital domain, are connected to the Dante
interface section where they are packetized and prepared for
transport over Ethernet. The P48 phantom power source is
extremely low noise, providing microphone power while caus
-
ing little signal degradation. This is important for demanding
applications.
The mic/line inputs were carefully designed for use in per
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manent, as well as portable and field, applications. Extensive
filtering minimizes the chance that radio frequency (RF) energy
will interfere with the audio input signals. Other components
were included to specifically address ESD (“static”) situations,
helping to ensure long-term reliable operation.
Metering
Two 8-step LED meters provide a real-time level indication of
the two Dante transmitter (output) channels. Scaled in dBFS
(decibels referenced to full scale digital) the meters offer a
direct view of the audio signal levels as they are transported
via Dante in the digital domain. This is important as optimal
audio performance requires transporting signals at their
proper levels — without an accurate indication this can be
difficult to achieve.
Ethernet Data and PoE
The Model 5205 connects to an Ethernet data network using a
standard 100 Mb/s twisted-pair Ethernet interface. The physi
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cal interconnection is made by way of a Neutrik® etherCON
RJ45 connector. While compatible with standard RJ45 plugs,
etherCON allows a ruggedized and locking interconnection
for harsh or high-reliability environments. An LED displays
the status of the network connection.
The Model 5205’s operating power is provided by way of the
Ethernet interface using the 802.3af Power-over-Ethernet
(PoE) standard. This allows fast and efficient interconnec-
tion with the associated data network. To support PoE power
management, the Model 5205’s PoE interface reports to the
power sourcing equipment (PSE) that it’s a class 2 (low power)
device. An LED is provided to indicate when power is being
supplied to the Model 5205. If a PoE-enabled Ethernet port
can’t be provided by the associated Ethernet switch a low-cost
PoE midspan power injector can be utilized.
Dante Audio-over-Ethernet
Audio data is sent from the Model 5205 using the Dante Audio-
over-Ethernet media networking technology. As a Dante-com
-
pliant device, the Model 5205’s two transmit audio channels
can be assigned to other devices using the Dante Controller
software application. The bit depth is 24 and sample rates of
44.1, 48, 88.2, and 96 kHz are supported. Two bi-color LEDs
provide an indication of the Dante connection status.