Grass Valley 8920DMX - Manual (Page 13)

8920DMX Instruction Manual 13
Configuration
Configuration
The 8920DMX module can be configured locally using onboard switches or
remotely using the 8900NET network interface.
Configuration and adjustment items for the 8920DMX include:
• Remote control lockout (with onboard jumper JP10),
• AES balanced 110 Ω or unbalanced 75 Ω output (configured with
onboard jumpers),
• Audio channel extraction/deletion,
• Source of CRC/UVC generation, and
• Setup save and recall.
Refer to the following sections for configuration instructions:
• Configuration Summary ( page 13 )
• Onboard Module Configuration ( page 14 )
• Remote Control and Monitoring ( page 16 )
Configuration Summary
The 8920DMX module accepts an SD video input and can be configured by
the user to extract and pass or delete any one of four audio groups present
in the SD signal. This is done with the Audio Group Management controls.
The extracted audio group can be accessed at either AES balanced 110 Ω or
unbalanced 75 Ω outputs (jumper selected) from the module.
Note The 8920DMX extracts and deletes only one audio group. To change more
than one audio group in the SD stream, you can loop the input to multiple
modules and configure each module to manipulate one of the four groups
The module also provides a control for selecting CRC/UVC generation.
Normally, this control should be set to external. However, because of limi-
tations in the module’s hardware, if the AES 1 and AES 2 channels in an
audio group are out of time (> 1 audio clock), the CRC/UVC on the AES 2
output gets corrupted. In this case, CRC/UVC generation should be set to
internal. In this mode, the module strips the externally generated CRC
from the two audio streams and inserts an internally generated CRC/UVC,
avoiding possible CRC errors downstream.
Note With CRC/UVC generation set to internal, status bits on the AES output are
set to 48 kHz Professional (synchronous) and user bits are set to zero.