Pathway Connectivity
VIA 12 Manual
V3 – April 2015
15
Alternate Art-Net Mapping
This feature is used in conjunction with the ‘Broadcast Art-Net Trap-and-Convert to
sACN’, which is set from the Port Configuration menu. This feature does not affect
unicast Art-Net packets.
The Art-Net protocol uses two hexadecimal numbers, a ‘subnet’ and a ‘universe’, to
define its DMX universe numbering. Numbering is usually shown as # - # and the valid
range is from 0 - 0 (zero-zero) to F- F.
However, most other common protocols including sACN do not have a universe ‘zero’.
The issue is compounded because some Art-Net implementations are shown in a
straight decimal representation (1, 2, 3, 4…) without any indication if “1” corresponds to
Art-Net universe 0-0 or to 0-1.
By default, Art-Net Universe 0-0 is ignored by the VIA and the packets discarded. When
Alternate Art-Net Mapping is enabled, VIA switches will map Art-Net Universe 0-0 to
sACN Universe 1. When Alternate Art-Net Mapping is disabled, Art-Net Universe 0-0
will be ignored by the VIA and Art-Net Universe 0-1 will be routed as sACN Universe 1.
Quality of Service (QoS)
Quality of Service determines the relative priority of different data packets, which in turn
determines which packets should receive preferential routing from a VIA switch. QoS is
often used for the distribution of video and audio signals, including the Dante® audio
standard, to meet the signal’s required timing constraints. Please remember that giving
all data high priority is the same as treating all traffic equally.
Property
Explanation
Off (default)
Disables QoS-based routing. All traffic is treated equally.
Standard
Traffic priority is observed using a weighted algorithm to
ensure timely delivery of high priority traffic and eventual
delivery of lower priority packets.
Dante Strict
Traffic priority is strictly observed, using Dante-specified
weighting. Lower priority traffic may be dropped or ignored to
ensure delivery of Dante’s high priority packets.
For more information, please refer to the Appendix.
