User guide
20
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 trac over other network trac. QoS is available
in many inexpensive and enterprise Ethernet switches. Any switch that supports
Diserv (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 / Diserv priority values when conguring QoS?
Switches prioritize packets using what are called DSCP/Diserv values. Although
Dante packet priority values have been chosen to make it simple to congure QoS
with many switches, some switches require special conguration to recognize and
prioritize specic DSCP values.
The table below shows how Dante uses various Diserv 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
trac
BestEort 0x00 0 000000
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companies. All specications subject to change without notice...except the recipe, which is a classic.