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5
Frequently Asked Questions
SL-Dante-SPK
User Guide
When do I need to use QoS in a Dante network?
QoS is required when using Dante in networks that have 100 Mbps devices and is
optional in networks with gigabit devices. We recommend that QoS be enabled in all
Dante networks in order to ensure proper operation under all possible conditions.
How does Dante manage QoS?
Dante uses standard Voice over IP (VoIP) Quality of Service (QoS) switch features
to prioritize clock sync and audio traffic over other network traffic. QoS is available
in many inexpensive and enterprise Ethernet switches. Any switch that supports
Diffserv (DSCP) QoS with strict priority and four queues and has gigabit ports for
inter-switch connections should be appropriate for use with Dante.
How does Dante use DSCP / Diffserv priority values when configuring QoS?
Switches prioritize packets using what are called DSCP/Diffserv values. Although
Dante packet priority values have been chosen to make it simple to configure QoS
with many switches, some switches require special configuration to recognize and
prioritize specific DSCP values.
The table below shows how Dante uses various Diffserv Code Points (DSCP) packet
priority values:
Priority
Usage
DSCP
Label
Hex
Decimal
Binary
High
Time critical
PTP events
CS7
0x38
56
111000
Medium
Audio, PTP
EF
0x2E
46
101110
Low
(reserved)
CS1
0x08
8
001000
None
Other
traffic
BestEffort
0x00
0
000000
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or registered trademarks of PreSonus Software Ltd. Mac and Mac OS are registered trademarks of Apple, Inc., in the U.S. and other countries. Windows is a registered trademark of
Microsoft, Inc., in the U.S. and other countries. Temporal EQ and TQ are trademarks of Fulcrum Acoustic. Other product names mentioned herein may be trademarks of their respective
companies. All specifications subject to change without notice...except the recipe, which is a classic.
