Restrictions for PTP on the SV-4K Media Players
Before you configure PTP on the SV-4K media players, consider the following
restrictions:
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PTP messages will not cross VLANs. Therefore, PTP master candidates need to
be identified for each VLAN and configured in the Management Dashboard.
NOTE:
For ease of configuration for venues with multiple VLANs,
the system is configured by default to list all SV-4K devices as
eligible PTP master candidates. However, be aware that
although this simplifies configuration, the time that it takes for the
SV-4Ks to arbitrate a master SV-4K device in each network will
vary, and depends on the number of eligible devices in each
network.
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Content synchronization for video playback on the SV-4K media player relies on
precise time across DMPs using PTP. The behavior is similar to content
synchronization on the Cisco DMP 4310G. If SV-4K devices are playing video
and one of the devices reboots, the rebooting unit will restart video playback from
the beginning and will only synchronize with the other players when the next item
in the playlist is rendered.
If SV-4Ks are participating in zone-based content synchronization for video walls,
with some enhanced synchronization capability, the rebooting unit will
synchronize with the current item being played by the device leader in the video
wall. For more information, see the “Working with Video Walls” section of the
Cisco StadiumVision Director Operations Guide
.
Guidelines for NTP and PTP on the SV-4K Media Players
Before you configure NTP and PTP on the SV-4K media players, consider the
following guidelines:
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For new installations of Cisco StadiumVision Director Release 4.0, PTP is the
default time source for the SV-4K media players, with NTP as the default time
source for the elected SV-4K PTP master.
NTP Guidelines
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Each SV-4K media player designated as PTP master (per VLAN) will use NTP as
its time source. The other SV-4K devices in the network operate using a
PTP reference clock from the elected PTP master.
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When PTP is disabled (not recommended), all SV-4K players use NTP to set their
local clock.
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