Pro64 audio networks can potentially have a greater number of audio
channels and hardware I/O devices connected than the network can make
use of at one time. This provides flexibility without requiring constant re‑
patching.
Keep in mind that a Pro64 A‑Net network can only manage a specific number
of Slots at a time, and this number varies with the sample rate being used.
The maximums are 64 Slots in Auto Mode at the 48kHz sampling rate and
64x64 Slots in Manual Mode at 48kHz.
In summary, think of “channels” as hardware resources that can be added to
the network as needed and “Slots” as locations within the Pro64 digital audio
network pipeline that A‑Net uses to move data throughout the network.
Slots and Sample Rate
The current system‑wide sample rate will determine the number of A‑Net
Slots that are available. Auto Mode and Manual Mode have the same number
of Slots at each sample rate; only the direction of the data is different.
Sample Rate
A-Net Slots
Yamaha Compatibility
44.1kHz
64
Yes
48kHz
64
Yes
88.2kHz
32
Yes
96kHz
32
Yes
176.4kHz
16
No
192kHz
16
No
Even though the network sample rate may change the available number of
A‑Net Slots, the I/O capacity of a hardware device does not change. That is, a
16‑channel input module in a 96kHz network can still have all of its channels
activated; all of its physical inputs can operate at 96kHz.
The current sample rate will also affect the display of available A‑Net Slot
ranges. Slot ranges will always have the same maximum number as seen
in the sample rate chart. At 96kHz, for example, only Slots 1 through 32 are
available; the Slot range from 33 to 64 is inactive and unavailable at 96kHz.
Slot ranges outside the maximum for the current sample rate can be selected,
but attempting to activate a channel in an unavailable range will result in an
error message on hardware I/O modules (the selected channel button, A‑Net
Slot range, and sample rate LEDs will all flash). Note that console interfaces
such as the 6416Y2 card have no A‑Net Slot displays and cannot display these
error messages.
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