Aviom ASI - Manual (Page 12)

11 A
bout
A-N
et
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 word clock.
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™
(VDC). 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.
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/RS‑422, and GPIO. And as with audio signals, VDC control
data can be input anywhere and output anywhere else in the network.
The exact complement of VDC I/O connectivity varies per product.
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 application.
Each A-Net port carries bidirectional data at all times.