SCore Live
Modules 3-11Date printed: 26.05.08
3.4 Ext. Sync Card 1.943.331
The Ext. Sync card acts as a connector panel for audio clock syn-
chronization inputs and outputs. Three inputs (VIDEO IN, WCLK IN, and AES
SYNC IN) can be used; their signals are sent to the sync bus on the
backplane. While the video sync is separated on the card, the other signals
are just driven onto the bus. A green LED indicates that the applied external
sync is used by the system. The system clock can be used from the WCLK
OUT and AES 3x OUT outputs.
Important: If the system is using MADI links, the deviation of the external sync signal
from the nominal clock frequency must not exceed ±100 ppm. If no MADI
links are used, a deviation of ±2500 ppm is tolerated.
Sync Priority The sync source is automatically selected according to the following table:
Clock Source Priority
Video 1
AES/EBU 2
Wordclock 3
Internal 4
Ext. clock frequency deviation (system with MADI links) ±100 ppm
(system without MADI links) ±2500 ppm
Current consumption (5 V) approx. 100 mA
Operating temperature 0...40° C
Backplane
Sync Bus
Video Ref.
Input
EXT SYNC CARD
Video
Sync
Separator
WCLK In
AES/EBU In
AES/EBU
Out1
AES/EBU
Out2
AES/EBU
Out3
WCLK Out
EXT LOCK
LED
