Grass Valley DAP-1781 - Manual (Page 54)

GUIDE TO INSTALLATION AND OPERATION
54 | DAP-1781
4.11 A-BUS
The DAP-1781 can be used stand alone or as a
companion to provide additional audio channels
for other Densité cards. The A-BUS (audio bus)
links the DAP-1781 to the other cards and is used
to configure the system and to display the
presence of other installed cards.
A-BUS Config:
Select whether the A-BUS is to be disabled, and
whether this DAP-1781 is Master, Slave 1 or Slave
2 in the A-BUS configuration.
• Not connected to Audio Bus – when the A-
BUS is disabled, it is not possible to detect
other attached cards in the system.
• Slave 1 of Video Card – used for a two-card
system when the other card is a video
processor.
• Slave 1 of Video Card, Slave 2 is present –
used for a three-card system, with a video
processor and another audio processor
configured as Slave2.
• Slave 2 of Video Card, Slave 1 is present –
used for a three-card system, with a video
processor and another audio processor
configured as Slave1.
• Slave 2 of Video Card, Slave 1 is present, Serial Mode – used for a three-card system, with a video
processor and another audio processor configured as Slave1. The card Slave 2 is in Serial Mode.
• Master – the card is standalone, or used as a master for another audio processor configured as Slave.
This mode is not available when a video card is attached to the A-BUS.
• Slave of Audio Master Card – used for a two-card system when the other card is a audio processor
configured as Master.
Status:
• V Presence – turns green to monitor the presence of a video card in the A-BUS configuration.
• A2 Presence - monitors the presence of another audio card in the A-BUS configuration. The icon is
labeled A2 if this card is Slave1, and is labeled A1 if this card is Slave2.
Tracking Delay: When a DAP-1781 is a slave of a video card, the variable delay applied to the video signal
by the synchronization process is always applied to the audio signals. This tracking delay will also be applied
to a Metadata signal extracted by the Dolby decoder module; the Metadata output will stay synchronized with
its associated audio. The Tracking delay is not applied to a Slave card in Serial Mode.