Grass Valley Profile Enhanced Disk Recorder - Manual (Page 24)

Enhanced Disk Recorder Installation
16 Enhanced Disk Recorder Installation
Audio Clock Cabling
NOTE: Although the Slave EDR board does not require audio clock cabling, the
information is included here in case you have to move other boards to make room for
the Slave EDR board.
This section provides information about audio clock cabling. In general, if all the
audio/video devices are connected to house reference, audio clock cabling is not
required. The need for audio clock cabling arises when an external audio clock signal
from the appropriate video board must be used to synchronize the audio to the video.
Cabling between connectors on the top of the video boards and connectors on the top
of the ASPB provide the external audio clock signals.
ASPB Audio Clock Cabling
The ASPB provides input of four external audio clock signals, one to each
Audio 1–Audio 4 bank, where each bank consists of four audio channels. ASPB
Audio 1–Audio 4 connectors begin closest to the rear panel and go toward the front
panel.
In general, the video board in the lowest numbered slot must provide the audio clock
signal to the Audio 1 bank, the video board in the next lowest numbered slot must
provide the audio clock signal to the Audio 2 bank, etc. For example, if you have video
boards in slots J5 and J11, the audio clock signal from the video board in J5 must be
connected to Audio 1 on the ASPB and the audio clock signal from the video board in
J11 must be connected to Audio 2 on the ASPB. If, however, the video board in J5 has
two audio clock signals, those signals must be connected to Audio 1 and Audio 2,
respectively, on the ASPB and the audio clock signal from the video board in J11 must
be connected to Audio 3.
Figure 4 (page 17) and Figure 5 (page 18) show examples of external audio clock
cabling with the ASPB. In Figure 4, the Analog Composite I/O boards, installed in slots
J14 and J15, are the only video boards. The audio clock cable connections are:
• Channel A of the board in slot J14 to Audio 1 on the ASPB in slot J13.
• Channel B of the board in slot J14 to Audio 2 on the ASPB in slot J13.
• Channel A of the board in slot J15 to Audio 3 on the ASPB in slot J13.
• Channel B of the board in slot J15 to Audio 4 on the ASPB in slot J13.