Grass Valley NV8500 Series v.3.5 - Manual (Page 68)

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Inputs and Outputs
I/O Cards
bedder and embedder cards. The audio from several standard input cards can be recombined
and re-embedded on output.
DHP allows you to populate the router with several relatively inexpensive standard I/O cards and
just a few hybrid I/O cards and still have the benefits of hybrid routing.
For more information about using DHP, see the DHP Reference Manual .
Input
For NV8500 routers other than the NV8140, the hybrid disembedder card and the frame sync
input card receive up to 8 video streams composed of either SD, HD or 3Gig signals.
For the NV8140, the hybrid disembedder card receives up to 16 video streams composed of
either SD, HD or 3Gig signals. (The NV8140 does not have frame sync cards.)
Each stream can carry up to 16 embedded audio channels for a total of 128 audio channels or, in
the case of the NV8140, up to 256 audio channels.
Each video stream is forwarded to a cable equalizer and then to a disembedder. The card auto-
matically detects whether the video format has embedded audio. Embedded audio channels
are forwarded to an audio TDM MUX and then to the motherboard for distribution to the cross-
point cards. Similarly, the video signals are forwarded to the motherboard, which distributes the
signals to the crosspoint cards.
With the exception of the NV8140, the input card also distributes one signal to a monitor
selector for distribution to a monitor card. (See
Monitoring on page 89). The NV8140 does not
support monitoring.
Output of Embedder Cards
The hybrid embedder card receives 16 video signals (SD, HD or 3Gig) from the crosspoint cards
(via the motherboard). It accepts 256 audio signals from the TDM matrix. The card has 16
embedders. Each embedder embeds 16 audio (AES or Dolby E) channels from multiple sources
into a video stream. The embedder then forwards the output to a reclocker. The card’s reclockers
sends one copy of each signal to the monitor selector and another copy to the cable drivers, ulti-
mately to the output connectors. Except in the NV8140, the monitor selector is 16×1 MUX that
sends its output to a monitor card. The NV8140 does support monitoring. (See
Monitoring on
page 89.)
Note: Hybrid embedder cards mute during a control card fail-over.
Note: It is possible in MRC to cause the reclockers on the output card either to be used or to
be bypassed individually for each output of the router. These attributes are specified in the
‘Output Attributes’ page of MRC.
The following diagram shows the flow of a signal through hybrid embedder cards. Video signals
are routed through the crosspoint matrix. Audio signals are routed through the TDM matrix.
Fig. 2-18: Block Diagram of Hybrid 3Gig Signal F low
16 video
Embedder Cards
Monitor
Selector
Embedder
Cable
Driver
(with 256 audio
embedded)
to Monitor
Card
TDM
Matrix
(Audio)
Crosspoint
Matrix
(Video)
Reclocker
16 video
256 audio
video
audio
(There are no monitor
cards in the NV8140)