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6About A-net
rates, from 44.1/48kHz± to 192kHz±. Because no sample rate converters are
used, audio transmission is kept fast and clean, eliminating the audio artifacts
and signal degradation inherent to sample rate conversion—even when
syncing to an external clock source.
Any Pro64 I/O module can be designated the Clock Master for the network,
generating and distributing its internal clock. Digital I/O modules are capable
of syncing to and distributing an external clock from a Word Clock or AES3
source to the network.
Control Data
The Pro64 Series has built‑in, dedicated bandwidth for 14 channels of
non‑audio control data through the use of Aviom’s innovative Virtual Data
Cables™. These data streams are always available to carry MIDI, RS‑232, RS‑
422, or GPIO (General Purpose I/O), and they never compete with the audio
channels for network resources, regardless of the system configuration. (Not
all VDC™ data types are supported on every Pro64 module.)
Because VDC inputs are simply incorporated into the A‑Net stream, these
control signals can be transmitted over very long cable runs and even across
an entire Pro64 network, significantly expanding the applications possible
with MIDI, RS‑232/422, and GPIO. And as with audio signals, VDC control data
can be input anywhere and output anywhere else in the network.
A-Net Ports
Pro64 I/O modules have dual A‑Net ports, labeled A and B. Both ports carry
a bidirectional A‑Net stream at all times. (That is, both ports are always
transmitting and receiving A‑Net data.) Pro64 networks can be configured in
one of two operational modes, Auto Mode or Manual Mode, depending on
the requirements of a particular system.
In Auto Mode, there are no connection rules; connect a Cat‑5e cable to either
the A or B port and the system does the rest. Auto Mode provides a true
audio network with 64 available “Slots” for transporting audio (at 44.1/48kHz).
Every audio Slot is available everywhere in the system, with no upstream/
downstream restrictions.
In Manual Mode, the Pro64 network becomes a 64x64 system (at 48kHz),
similar to a traditional stage‑to‑FOH snake. At every point in the Manual
Mode network, two 64‑channel streams are available on the cable and in
each module. The configuration of the cables and ports has an impact on
the makeup of the network and the distribution of audio signals. The user
can direct A‑Net data from an input module to a specific port (A, B, or both).
Output modules can be configured to output audio signals received from a
specific A‑Net port (A or B).