Grass Valley NVISION Compact CQX - Manual (Page 97)

Compact Router System Configurator • User’s Guide 85
12. Tutorials
Products
Figure 12-18 shows a simplified view of the CQX digital video router:
Figure 12-18. Block Diagram of the CQX Digital Video Router
The video routers perform input equalization and perform reclocking of outputs. Router outputs are
switched in sync with an external video reference if it is present. The video reference also provides
sync for embedded audio.
All CQX video routers accept bi-level or tri-level video references (sync) and switch according to
SMPTE RP168-2002.
The CQX video routers provide a bypass path for non-synchronous input signals. If the two sources
chosen for a clean and quiet switch are not of the same format, are off-rate, are not at the same
frame rate as the video reference, or do not meet the timing window specified by the user, the video
processor enters non-sync mode where the clean and quiet output behaves like an aux output in
which there is no video or audio processing. Switches still occur at the specified switchpoint for the
video reference, but they will not be “clean and quiet.”
Where two sources are not of the same format but are both synchronous with the video reference,
the switch still occurs in the video processor. This allows any eligible subsequent switches to be
clean and quiet and it also allows frame alignment of the output.
Where one or both of the sources is off-rate or at a frame rate different from that of the video refer-
ence, the output will bypass the video processor.
If a clean and quiet output is in a non-sync state but conditions change so that a clean switch is pos-
sible, the processor waits for one frame of video before switching to processed video to ensure that
the processed video has enough time to pass through the video processing path.
The CQX video routers have a removable fan unit. The fan unit is not visible when a CQX panel is
mounted on the router.
Figure 12-19. Front View of the CQX Video Router
Customers should have no reason to remove the fan unit.
clean 2
clean 1
Reclock
Bypass 2
CQX 2
6
6
µP Logic
Inputs
(Equalized)
Aux Outputs
Control
Panel
Video Reference
Automation
Ethernet
(optional)
16
Mix 1
Mix 2
Reclock
Bypass 1
CQX 1
Reclock
GPIO
Recessed Fan unit 16-pos Mode Switch
16-pos Frame ID Switch