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analog or digital—on a piece of hardware (such as the 16 mic/line XLR input
jacks on the 6416m Mic Input Module). Each of these audio inputs can be
made active and added to the network individually, and it is only when
activated that they use any network resources (the A‑Net Slots). To enable this
powerful feature, Pro64 products separate the hardware resources from the
available network resources with a button that allows each hardware input
channel it to be added to the network as needed.
It is these activated hardware resources that are being referred to as “Slots.”
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 or complicated computer programming.
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 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
44.1kHz 64
48kHz 64
88.2kHz 32
96kHz 32
176.4kHz 16
192kHz 16
Even though the network sample rate may change the available number of
A‑Net Slots, the capacity of a hardware device does not change. That is, a
16‑channel input module in a 192kHz network can still have all of its channels
activated; all of its physical inputs can operate at 192kHz.
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 numbered 1 through
32 are available; the Slot range from 33 to 64 is inactive and unavailable at
that sample rate. Slot ranges outside the maximum for the current sample
rate can be selected, but attempting to activate a channel in an unavailable