Vega 30 Router User Manual
Architecture and Signal Flow
Product Overview 3.4
Issue1 Revision 1
Page 19
© 2017 SAM
3.4.3 Video Reference
The Vega 30 Router auto-detects a bi-level or tri-level analogue reference sync signal and
reports the video standard. The Vega 30 Router has one video reference input. There is a
reference loop-through output and a selectable termination to 75R.
The video reference signal is used as the timing basis for video line switching. Switching is
then done independently for each router input (to SMPTE RP-168-2009).
The video standards for the Vega 30 reference input signal and for route switching are
defined as part of the unit configuration.
3.4.4 Timed Video Switching
The Vega 30 does timed switching to SMPTE RP-168-2009 for video input signals which are
compliant with SMPTE RP-168-2009 and which share the same frame rate. The router will
switch between inputs on the switching line according to the video switching standard of the
signal being switched to.
Using one video reference signal, the video switching standard can be configured separately
for each input. For example, with a 1080i50 analogue reference signal, 1080i50, 1080p50 and
625i25 signals can be timed-switched.
3.4.5 Line Synchronizing and Offset from Reference
Each switched video output can be independently line-synchronized and, if required, can be
further delayed from the reference timing.
•
Line Synchronizing
- synchronizes the router output to the video reference
according to the routed input’s timing switching standard.
•
Delay
- if required, delay can be added into each router output to offset the output
signal timing from the reference signal timing.
See Section 6 "Output Video Timing - Line Sync and Offset" on page 45 for more information.
Note:
The Vega 30 Router carries out timed-switching which is only supported for a single frame
rate at any one time.
For example, with a 50Hz reference, 59.94Hz and 60Hz frame rate signals cannot be
timed-switched.
Important:
If there is no reference input signal,
the router will crash-switch upon receiving a routing switch command.
If a video input signal is inconsistent with the configured video switching standard set up for
that input, then the signal will be crash-switched.
When using an interlaced reference signal, progressive video sources are only switched on
the first field of the reference signal.
