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Appendix 3: Quad Speed ADD-ON Bus
Scope
The internal audio ADD-ON bus needs an upgrade for certain applications. We want more channels (32
per video stream seems possible in the near future). And we want the bus to be bidirectional, i.e. 32
channels in and 32 channels out at the same time.
The new interface needs to be compatible with all existing hardware (frames) and in the implementation
of the master card it needs to be backward compatible with the original ADD-ON bus.
The MASTER-CARD is now firmware enhanced to run 32 channels in either direction (64 channels total)
instead of 16 channels in one direction.
Features
Some master cards will have two modes and others will only have the Quad Speed mode, whereas the
logical ADD-ON cards are only available in Quad Speed mode:
Dual mode master cards have a menu item to select the appropriate mode. If a mode is
selected, all ADD-ON cards to that master need to be in the same mode.
The following features and rules apply:
• Up to 32 channels output from the master card, with looping to up to 3 ADD-ON cards
The ADD-ON card chooses the channels it wants to process.
Some ADD-ON cards will have the possibility to re-inject processed audio onto the next ADD-ON
card.
• Up to 32 channels input on the master card
40 | November 2021 | Issue 1.00.B