Grass Valley NV8500 Series v.3.5 - Manual (Page 70)

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Inputs and Outputs
I/O Cards
Note: the routers can receive and transmit Dolby E as a pair of channels in a MADI stream.
Hybrid I/O cards require the installation of hybrid control cards and hybrid crosspoint cards in
the router. Although the installation of one or more hybrid 3Gig/TDM output cards is recom-
mended, it is possible to switch outgoing audio signals from MADI inputs to hybrid embedder
cards.
An NV8900 interface can be used with MADI (3Gig/TDM) cards to convert your facility’s AES
signals or analog audio signals into a MADI stream, or to convert an outgoing MADI stream into
discrete AES signals or analog audio signals.
NV8900 MADI Interfaces
The NV8900 MADI interfaces convert discrete audio signals to MADI and vice versa. There are 6
NV8900 models:
AES, balanced to MADI MADI to AES, balanced DB25 connectors
AES, unbalanced to MADI MADI to AES, unbalanced Coax connectors
Analog audio to MADI MADI to analog audio DB25 connectors
All are 1RU interfaces.
The MADI converters allow you to (1) concentrate discrete audio signals in a MADI stream,
conserving router inputs and outputs, and (2) pass discrete audio signals through a router’s TDM
switching matrix, where they can be re-combined. (Signals on AES async cards are not passed
through the TDM matrix.)
The NV8900 AES-to-MADI converters receive 32 AES pairs and multiplex them into one MADI
stream.
The NV8900 AA-to-MADI converter receives 64 analog signals pairs and multiplexes them into
one MADI stream.
The NV8900 MADI-to-AES converters extracts 32 AES pairs from a MADI stream.
The NV8900 MADI-to-AA converters extracts 64 analog signals from a MADI stream.
Input
For all NV8500 routers except the NV8140, the 3Gig/TDM input card receives 8 3Gig video
signals (SD, HD or 3Gig) and one MADI stream composed of up to 64 (mono) channels through 9
DIN 1.0/2.3 connectors. Each card has 8 cable equalizers, one for each of the 8 video signals.
For the NV8140, the 3Gig/TDM input card receives 16 3Gig video signals (SD, HD or 3Gig) and 2
MADI streams, each composed of up to 64 (mono) channels through 9 DIN 1.0/2.3 connectors.
Each card has 16 cable equalizers, one for each of the 16 video signals.
Each cable equalizer distributes the video signal to the motherboard. The motherboard
forwards the signal to the hybrid crosspoint cards for distribution to output cards. An incoming
signal can be distributed to any or all hybrid output cards. The card’s video inputs can also be
distributed to any standard output card. The card also distributes a video signal to a monitor
selector for distribution to a monitor card. (See
Monitoring on page 89.)
Any embedded audio in the video stream is passed through the router with the video signal.
The audio is not disembedded.
One MADI stream is received though one input connector at a sample rate of 48 kHz (i.e.,
samples per second). The router can receive any number of MADI channels (up to 64) in a
stream.