PD Dante
version 2.02 rev a - 31/10/18
39
Incorrect redundant network configuration
There are a few ways to incorrectly configure a redundant network. More than one of these
can be present at the same time.
•
Connecting the secondary interface of a Dante device to the primary network
o
Most commonly by either misunderstanding how redundancy works, and
using only one switch with all cables connected to it; or correctly using two
switches or networks, but accidentally connecting one secondary cable to a
primary network switch
•
Joining the primary and secondary Dante networks
o
By connecting primary and secondary switches, or perhaps just using one
switch.
•
Multiple interfaces on the same device using the same IP address subnet
o
Possibly by having the same DHCP server on both primary and secondary
networks, or both DHCP servers configured to serve the same IP addresses.
Also, mixing DHCP and Link Local on the same network can cause issues. It is
often necessary to have all devices and the computer on either DHCP or Link
Local.
Dante Latency will depend upon the number of switches the signal is being routed through
and on average a signal takes 100uS to travel through a switch (Please remember that each
Dante device contains one switch)
In a simple Dante network with just one external switch latencies below 0.25mS will be
easily attainable.
Note that Multicast streams will always have a latency of 1mS
For complex networks, it is recommended to set some values in DSCP part of the QoS
(Quality of Service) in managed routers/switches
There are 64 parameters in DSCP set all to Low Priority except for the following:
•
#8
(Control Data)
set to Medium Priority
•
#46 (Audio Data)
set to High Priority
•
#56 (Clock)
set to High Priority
You will need to refer to your router manual for how to adjust these settings
If using Multicast streams, Wi-Fi and/or 100Mbs it would be also advisable to use IGMP
snooping if it is available on your router as this will significantly reduce the overall data rate
on your network and only send data to the IP address that requests it rather than to all IP
addresses.
For Dante Cable Copper:
•
Use CAT5e or CAT6, solid core, shielded
•
Never use a copper cable longer than 100m
•
Use cable with solid copper cores whenever possible
•
Stranded copper cores are more flexible, but not so good at long distance
transmission
•
Keep 60m maximum with stranded cable
•
A lot of rugged “stage-cable” is stranded, so take care.
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