Telos Alliance Linear Acoustic SDI XNODE, User Manual

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| Section 4
Synchronization and QoS Page
The Synchronization and QoS page is where the L network and SDI xNode reference clock is configured,
along with network QoS configuration.
L’s clocking system is automatic and largely transparent to end users. If no clock is present on the network,
L 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.
Figure 33 - Synchronization and QoS page
Clock mode
L IP low rate (the default setting) is suggested for a typical L network. L IP “STL” is an
option for an application where a node is at the remote end of an STL link (Live streams not supported while in
this mode). L IP high rate tasks the node to synchronize to the fast clock is not needed in most cases. 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. NTP slave for special applications that synchronize
from an NTP source (Live streams not supported under NTP mode).
Note!
If an xNode becomes PTP master and the L clock master priority is set to a value greater
than 0, the xNode will change its priority to 7. This allows for the xNode to also become the master
source for L clock, ensuring a single clock source in the network.