ATI Audio DDA212-BNC - Manual (Page 2)

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DESCRIPTION
DDA-212 Series 2 Digital Audio Distribution Amplifiers are designed to
regenerate, isolate and distribute digital audio data formatted in accordance with
specifications AES3-1992 and IEC 958. This is commonly called AES/EBU
formatting or AES3.
DDA-212 Series 2 units have two inputs and 12 outputs, with the assignment of
inputs and outputs configurable from a front panel switch. The unit may be
operated as a Dual 1X6 or as a 2-Input 1X12, depending on the Input Select
switch setting. The selected input feeds AES audio to either six or all 12 separate
outputs.
A front panel switch selects either re-clocking or non-reclocking of the input
signal. In most cases, re-clocking is preferred, as this feature improves the
integrity of weak or distorted input signals. Re-clocking may be switched off to
allow distribution of AES sync signals, Dolby E encoded AES signals, or other
signals that should not be re-clocked.
DDA-212 Series 2 units work with AES signals that contain sample rates from 27
through 192kHz and 16-bit through 24-bit density, thus permitting very high
resolution signals to be distributed.
The front panel displays full status of the input signal, including Sample rate,
Word Length, Digital Errors and Pro or Consumer Mode.
DDA-212 Series 2 units contain a unique automatic equalization function that can
adjust for extremely long input lines. Equalization works independently for each
input. A Front Panel Lock feature protects all your settings.
The Model DDA-212XLR uses XLR connectors and operates from and drives a
110-ohm balanced shielded twisted pair distribution system per AES3-1992.
The Model DDA-212BNC uses BNC connectors and operates from and drives
single-ended 75-ohm coaxial cable per AES-3id-1995 and is designed to
integrate easily into video facilities.
S/PDIF (consumer) formatted digital audio data differs primarily in the use of
consumer type "RCA" audio connectors in an unbalanced 75 ohm system and
can be handled by a DDA-212BNC with use of an RCA-to-BNC input cable.
Input Loop-through connections for each of the two inputs are provided to permit
multiple units to be stacked, or to insert the DDA-212 into your digital workflow.
Switchable line termination is provided. Standard practice dictates that the last
AES input be terminated; therefore, if you are not using the loop-through feature,
Input Termination should be switched ON.