Ross DED-8420, User Manual, Page: 21 / 36

DED-8420 User Manual (Iss. 01) User Controls
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3-5
LED Color Display and Description
DOLBY 2 Yellow When lit, this LED indicates a Dolby signal is detected at AES2 IN.
ERROR 2 Red
When lit, this LED indicates that the AES/EBU input signal is
invalid on AES2 IN.
COM
Activity
Green
When lit, this LED indicates that the DED-8420 is communicating
with DashBoard.
Modes of Operation
This section describes the four modes of operation available on the DED-8420.
Single AES Input Mode
In this mode, the AES1 Input is a Dolby signal. The DED-8420 decodes the signal and the outputs
are locked to the sample rate of the input signal.
Single AES Input with SRC Mode
In this mode, the AES1 Input is a Dolby signal and the AES2 Input is the reference signal (AES
and not DARS). The DED-8420 decodes the Dolby signal, and the SRC (Sample Rate
Conversion) converts the output signals to the reference sample rate of the AES2 signal if an
AES2 signal is not present, the SRC of the outputs is locked to that of the incoming signal on the
AES1 Input.
Dual AES Inputs
In this mode, the AES1 Input is a Dolby signal and the AES2 Input is a PCM signal. The DED-
8420 routes the AES2 Input to the SAP output connector on the Rear Module. The Dolby signal
(AES1 Input) is decoded and routed to the appropriate connectors on the Rear Module. If a SAP
channel is detected in the AES1 signal, it is replaced by the AES2 signal.
Note The output signal sample rates will be the same as that of the individual input
signals. For example, if AES1 and AES2 Inputs had different sampling rates at the
input of the DED-8420, then the sampling rate of the SAP signal is the same as that
of the AES2 Input and the sampling rate of the remaining outputs will be the same as
that of the AES1 Input. If the AES Inputs are flipped, where AES1 Input is PCM
and AES2 Input is Dolby, DashBoard indicates an error but the DED-8420 will
continue to operate.
Dual AES Inputs with Auto Swap Mode
In this mode, both the AES Inputs have signal connected to them. The DED-8420 determines the
Dolby signal and routes the it to the decoder. If both AES Inputs are Dolby signals, AES1 takes
precedence and is routed. If neither AES Inputs are Dolby signals, AES1 takes precedence and is
routed to the required output.