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Redbox User Handbook No 1
AES/EBU Output
The digital output XLR 3 pin socket has an impedance of 110 ohms. It has the following
connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
The signals on this connector will comply with the IEC 60968 specification
S/PDIF Output
The digital output S/PDIF phono output has an impedance of 75 ohms.
Rear Panel Controls
Status Select Switches
These switches are used to determine the content of the channel status bits embedded
within the digital audio stream (switches 1 and 2) and to select the source for the digital
sync signal from either digital audio input or TTL word clock (switch 3).
The channel status bits will be forced to Professional Mode for the highest 3 sample rates
as they are not supported by consumer mode. For the lowest three rate these status bits
can be either set to follow the input signal type (switch 1 off) or can be forced to either
professional or consumer mode (switch 1 on and switch 2 either off or on). These settings
are summarised in Fig 3-4 and are also on top of the unit.
Status Select Switch Settings
1
On
Force channel status type to...
1
Off
Follow input
2
On
Professional output
2
Off
Consumer output
3
On
Digital sync
3
Off
Word-clock sync
Fig 3-4: RB-SC1 Status Switches
Digital Input Select Buttons
These buttons are used to switch the digital connection between the AES/EBU XLR
connector (button out) and the S/PDIF phono connector (button in) for the digital source,
the digital sync input and the digital output
Frequency and Sync Mode Rotary Switch
This rotary switch is used to select the synchronisation mode and to select the frequency of
the digital output when using the on-board clock generator. There are 4 modes of operation
:- Master mode, Auto Sync Mode, Auto Lock Sync Mode & Slave Mode.
DIGITAL AUDIO CONVERTERS
3
DIGIT
AL A
UDIO C
ONVERTERS - RB
-SC1
