Studio Technologies 212 2006 - Manual (Page 13)

Model 212 User Guide Issue 3, July 2006
Studio Technologies, Inc. Page 13
The same content will be transmitted at
the same bit depth and clock rate. For full
isolation separate circuitry, including match-
ing transformers, is provided for the two
outputs.
AES3id Input
The AES3id input can be used to connect
digital audio signals to the Model 212.
The two audio channels associated with
the interface can serve as cue sources for
the stereo headphone output. The input,
physically a BNC connector located on the
Model 212’s back panel, allows a depth of
up to 24 bits to be supported; however any-
thing in the range of 16 to 24 bits will work
correctly. The input is “self-clocking” so
that compatibility with virtually any AES3id
source should be possible. It’s expected
that in most cases the Model 212 will be
used in professional audio environments
where the sample rate will be 48 kHz. How-
ever, any source with a sample rate from
32 to 96 kHz will work correctly.
For the AES3id input to be active a configu-
ration setting must be correctly made. This
topic is discussed in detail in the configu-
ration section of this user guide. It’s also
important to note that the selected digital
input source will also serve as the clock
source for the Model 212’s digital outputs.
Optional AES3 Input
Circuitry contained within the Model 212
allows a technician to add support for a
standard AES3 input. This type of interface
allows two channels of digital audio to be
received over a balanced, transformer-
coupled, 110 ohm circuit. In some Model
212 applications the AES3 input will be
implemented using a 3-pin female XLR-type
connector installed in the back panel. Other
applications may use a multi-pin connector,
such as the Neutrik EtherCon version of the
8-pin RJ45 jack.
As with the AES3id input, for the AES3
input to be active the appropriate configura-
tion DIP switches must be set. And as with
the AES3id input, in additional to providing
cue audio sources for the stereo head-
phone output, the AES3 input will also serve
as the clock source for the Model 212’s
digital outputs.
Bidirectional Digital Interface
The Model 212 includes a bidirectional
digital interface for use in special applica-
tions. Using a single 75 ohm, unbalanced
connection, two channels of digital audio
can be both sent and received. The two
channels of receive audio can be used
as cue sources for the stereo headphone
output. Bit depths of up to 24 and sample
rates of 32 to 96 kHz are supported. For the
bidirectional digital interface to be active
the appropriate configuration DIP switches
much be set.
The ability of the bidirectional digital inter-
face to send and receive digital audio sig-
nals over one cable makes interconnecting
the Model 212 with other equipment incred-
ibly simple. For example, the bidirectional
digital interface is directly compatible with
the Riedel Artist® digital matrix intercom
system. A single cable is all that is required
to interface an Artist digital port with the
Model 212.
Optional Analog Line Inputs
While the Model 212’s headphone sources
were designed primarily to be supplied
using one of the digital audio inputs, it’s
also possible to connect one or two analog
line-level audio sources. Please refer to the
Technical Notes section of this user guide
for details.