Grass Valley DVCPRO Board Upgrade - Manual (Page 52)

DVCPRO Board Installation
52 DVCPRO Upgrade Installation
If your Profile unit has one ASPB, you can connect only four audio clock
references to it. If your Profile unit has two ASPBs installed, a total of eight audio
clocks can be connected.
In practice, if your Profile unit has more video inputs than the number of ASPB
clock inputs, you should connect audio clocks from video inputs that might
record video that is not genlocked to your house reference.
Any video inputs that are not supplying a record clock to the ASPB should be
locked to your house reference, if audio is to be associated with those inputs.
Otherwise, audio clock errors could occur during recording.
For more information on audio input clocking refer the Audio Configuration
information in the Profile Family User Manual.
Sharcnet Cabling
Serial digital I/O boards (SDI boards) with Sharcnet connectors have embedded
audio capability. These SDI boards extract audio from incoming video, route it to
the ASPB, and receive audio output from the ASPB to be embedded in the serial
digital stream. Sharcnet cables are used to route the audio between the ASPB and
SDI boards.
On both the ASPB and SDI board there are Sharcnet In and a Sharcnet Out
connectors. These are shown in Figure 9 on page 43. In general, ASPB Sharcnet
Outs are connected to SDI Sharcnet Ins, and ASPB Sharcnet Ins are connected to
SDI Sharcnet Outs. Simple enough, but connection order is important.
Here are the guidelines for making the Sharcnet connections:
• Beginning with the ASPB in the lowest numbered slot (ASPB1), Sharcnet
In1/Out1 are connected to Sharcnet Out /In of the serial digital video board
in the lowest numbered slot.
• Next, Sharcnet In2/Out2 are connected to Sharcnet Out/ In of the serial
digital video board in the next higher numbered slot.
• The pattern above continues for ASPB2 if two ASPBs are installed.
• The Exact number of Sharcnet cables will vary depending on how many
serial digital video I/O boards are installed.
• When two ASPBs are installed, Sharcnet Expansion 1 connectors on each
board are connected the Sharcnet Expansion 2 connectors on the other.