3: The xNode in depth • 17
© 2016 Axia Audio - Rev 2.0
If operating with Bank 1, and you wish to upload a different version, you will select the “commit this version to
Bank 0” and press Apply button. This will move the code to Bank 0 and empty Bank 1.
QOS (Audio xNodes)
Synchronization: Livewire’s clocking system is automatic and largely transparent to end users. If no clock is pres-
ent on the network, Axia devices negotiate a master by means of priority settings and the lowest MAC address. If a
device comes online into a network that has a clock present, it will not generate clock unless it has priority setting of
7. The xNode does permit variance in determining the source of clock.
Clock mode: Livewire clock priority 3 (the default setting) is suggested for a typical Livewire network. The higher
the priority number given to a node denes the preferred device to become clock master. A value of 7 insists the de-
vice becomes master. Livewire STL Snake mode, Master or Slave, are options for applications where a node is at the
remote end of an STL link. (Live streams are not supported while in this mode.) If the application is two dedicated
nodes at either end of a link, one will be selected to Master and the other to Slave. If the remote node is to connect
to a larger network at the studio side, the option to select is Slave—you don’t want the remote node creating clock
for the larger facility. PTP/IEEE 1588 ARB clock class 248 is the option to enable the xNode to participate in the
execution of the best master clock algorithm for a PTP (Precision Time Protocol) network (enabling it to be a master
PTP clock). PTP/IEEE 1588 slave enables the xNode to synchronize to a PTP network. There are various options
in the PTP category to allow the node to be a master of both PTP and the Livewire network or to be a slave to a
PTP grand master but a master to the Livewire network. This permits the xNode to behave as a gateway of sorts for
network synchronization between AES67 devices and legacy Livewire devices. NTP slave is for special applications
that synchronize from an NTP source. (Live streams are not supported under NTP mode.)
PTP characterizations
PTP domain number: (0 – 127) A domain is one or more PTP devices communicating with each other. A domain
association is used to dene communication messages. A value of 0 is standard.
PTP delay mechanism: (E2E or P2P) PTP supports two methods of time correction which alter messaging be-
tween devices. All devices within the network should use the same mechanism. The recommended setting is to use
End-to-End (E2E) since more networked devices prefer to support this option.
PTP clock priority1/priority2: Priority setting from 0-255 is used in the best master clock algorithm (BMC) to
determine a Grandmaster. Lower numbers have higher priority.
PTP clock sync interval: Is the time for sending synchronization messages. A setting of -4 is 16 messages in 1
second. A setting of 1 is 1 message in 2 seconds. The default setting is 0, 1 message per second.
AES Sync Source: Used to select the desired input to be utilized as an external clock source. This typically would
be used to sync the output ports to a rate different than 48kHz. (Only available on AES/EBU node.)
AES Output Sync: Denes the clock for the AES/EBU digital audio output ports (AES/EBU xNode and mixed
xNode). The default is to follow the internal 48kHz clock. If an alternate rate is needed, select the other option.
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