Audio clock cabling, Aspb audio clock cabling – Grass Valley Profile Composite I/O User Manual

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Analog Composite I/O Installation

Audio Clock Cabling

This section provides some general rules about audio clock cabling when either an
ASPB or an Audio I/O board is installed. Audio clock signals from the appropriate
video board synchronize the audio to the video during Record. Internal cabling
between connectors on the top of the video boards and connectors on the top of the
audio boards provide the clock signals to the audio boards.

ASPB Audio Clock Cabling

The ASPB provides for input of four audio clock signals to audio banks
Audio 1-Audio 4, where each bank consists of four audio channels. Audio clock
signals from video boards are prioritized by the slot locations of the video boards,
going from slot J5 to slot J15. ASPB Audio 1-Audio 4 connectors begin closest to
the rear panel and go toward the front.

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 one in J5 must be
connected to Audio 1 on the ASPB and the audio clock signal from the video board
in slot J11 must be connected to Audio 2 on the ASPB.

Figures 4 and 5 show examples of internal audio clock cabling with the ASPB. In
Figure 4, 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

Note that Figure 4 is an example with video boards only in slots J14 and J15. If you
have other video boards in lower numbered slots, you will have to determine how
you want to set your system up. You will have to remove any unused clock cables
and you may have to move boards around to accommodate your setup.