Autosync; Digital Routing; Source Switch - Apogee AD-8000 Operating Manual

At power-up, the microprocessor will recall the last selected sync source and determine if it is active (via the
measurement circuitry.) If it is active, then the AD-8000 will lock to it, preferably at the old sample rate, or if
that is not possible, at the present sample rate. If it is not active, then the microprocessor will default to CRYS-
TAL at 48 kHz.
With no optional modules, four selections are available:
Crystal:
Word clock:
AES:
S/PDIF
With the Video Sync Module, one further selection becomes available:
Video:
Note: the microprocessor measures the horizontal sync rate and sets the NTSC/PAL/Mono LEDs accordingly.
With Module A, B, C, or D, up to four more selections become available:
AMBus A:
AMBus B:
AMBus C:
AMBus D:

Autosync

Autosync switches the sync sources automatically to digital input synchronization when at least one digital
input is selected. It also returns the sync source to the original setting when the last digital input is deselected
(ie all inputs are analog). Autosync is set to ON or OFF with rear panel DIP switch #10. When SW10 is in the
default (DOWN or OFF) position, autosync is ENABLED. You can DISABLE autosync by switching SW10 to ON
(UP). Autosync should be disabled in environments in which you explicitly want one type of sync all the time, eg
video or Word Clock.

Digital Routing

Channel routing LED matrix.
Rows are input source (digital or analog), and columns are the output channel number. If all channels are in
A/D mode (analog in), then only the top row of LEDs is illuminated. If, for example, channels 3/4 are selected
as digital in, then two of the digital source LEDs are illuminated, under columns 3 and 4. In any column, only
one LED will normally be illuminated.
The DEST column indicates the AMBus destinations for channels 1–8. In general, digital output will be
mapped to every available output port, so as many as 6 LEDs in this column may be illuminated, depending on
whether output modules for A, B, C, and D slots are plugged in.

Source switch

Six selections:
AES in: Stereo digital data in from AES input jack is mapped to any selected 'Digital In' channel pair.
S/PDIF in: Stereo digital data in from S/PDIF input jack is mapped to any selected 'Digital In' channel pair.
AMBUS A: Digital data from A module mapped to selected 'Digital In' channel pair. If module A has 2 input
channels, mapping is similar to 'AES In'. If A module has 8 input channels, mapping is 1:1 for
those channels that are selected as digital.
AMBUS B: Same as for AMBUS A
AMBUS C: Same as for AMBUS A
AMBUS D: Same as for AMBUS A
Blinking SYNC SOURCE LED
When a SYNC SOURCE LED is lit while another is blinking, then the blinking SYNC SOURCE LED may be
selected as SYNC SOURCE by pressing the SOURCE button.
For example: Starting with CRYSTAL selected as SYNC SOURCE and AES/EBU selected as SOURCE, press the
SYNC SOURCE button three times. The AES/EBU SYNC SOURCE LED will remain lit while the S/PDIF SYNC
SOURCE LED blinks. This condition indicates that S/PDIF may be selected as SYNC SOURCE if the SOURCE
AD-8000 Operating Manual
sync to internal crystal
sync to external word clock
sync to AES input
sync to S/PDIF input
sync to external video source (PAL, Monochrome, NTSC)
sync from AMBus module A
sync from AMBus module B
sync from AMBus module C
sync from AMBus module D
Page 18