HELIOS LED Processing Platform - USER GUIDE 103
Redundancy Modes
One of the three operating modes must also be selected; None, Failover or Seamless.
Figure 137: Mode selection
None - HELIOS will not be expecting a backup processor. If the backup processor goes away HELIOS will not throw
any errors. If HELIOS detects a backup processor on the network it will still be able to make use of it.
Failover - Tiles are set to receive video from one processor only, the main processor. This provides tiles with a
predictable signal path. Tiles will re-associate to the backup processor if the main processor stops sending
video or the input fails. Since tiles only accept videos from one processor, a failure event will have a slight
perceptible disruption in the content as the affected tiles associate with the backup processor.
Seamless - Tiles are automatically associated with the highest priority processor available to them during startup. In this
mode, the tiles in the display are allowed to receive video simultaneously from both processors. The image
that a tile displays can be made up of data from both the main and backup processor. When using the
Seamless mode, the input video to each of these HELIOS Processors must be identical and frame synced. This
is so that there will be no perceptible difference in the image, as tiles use data from both processors. Since
the system is using both processors simultaneously, failures have a near imperceptible impact. However,
Seamless mode does not do well in situations where a complicated upstream video pipeline can make it
difcult to detect input failures.
Override test pattern (when in backup role)
An alternate processor test pattern can be assigned to backup processors. This feature is primarily designed to help
technicians during setup see clearly which processor a tile is currently connected to. The default mode is to follow the
main test pattern (the rst option in the list).
Figure 138: Test pattern override
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