Grass Valley NV7512 v.1.3 - Manual (Page 39)

NV7512 Audio Router • User’s Guide 29
1. Introduction
Frame Expansion
The Quad Mix output card is managed through a separate Quad Mix control panel (NV9660). The
Quad Mix control panel is used to set balance and gain levels. For more information, see the
NV9660 User’s Guide.
The Quad Mix card can receive up to 32 signals from the crosspoint cards. Each signal is forwarded
to one of 4 mixers, designated 1 though 4. Incoming data for mixer 1 comes from the first 8 outputs
associated with the output card’s location. Incoming data for mixer 2 comes from the next outputs
associated with the output card’s location, and so on. The mixer adjusts the balance and gain for
each signal according to settings entered in the NV9660 Quad Mix Control Panel (see the NV9660
User’s Guide). Each signal is then forwarded to a 16 x 1 Mux, which forwards two copies of the
signal. One copy is distributed as an AES signal through 4 BNC coaxial connectors. The other copy
is forwarded to a digital-to-analog converter and distributed as an analog signal through a DB25
connector. The Quad Mix output card does not send a copy of the outgoing signals to the monitor
card.
Figure 1-23 shows the signal flow for a Quad Mix output card.
Figure 1-23. Quad Mix Output Card Block Diagram
Status Reporting
All output cards feature a circuit that performs status reporting and drives the card’s functions. Five
LEDs on the front of each output card indicate the card’s status: alarm (Red), power good (Green).
For more information, see
Indicator LEDs on page 100.
Monitor Card
Using a monitor card, the quality of outgoing signals can be monitored. The monitor card
(EM0429-10) receives a single signal from each output card, except for the Quad Mix output card.
For analog signals, the digital signal prior to conversion to analog is sent to the monitor card, not
the analog signal. The monitor card then sends two outgoing signals for monitoring purposes. Mon-
itor cards only receive outgoing signals from the local router on which it is installed.
Frame Expansion
Up to four NV7512 router frames can be connected together, creating a maximum switching con-
figuration of 2048 inputs x 2048 outputs stereo (4096 inputs x 4096 outputs mono). The total num-
ber of signals in the configuration depends on the type of signal. For example, for AES unbalanced
signals, configurations can start at 32 inputs x 32 outputs, but analog signals start at 16 inputs x 16
outputs. For a complete list of signal inputs and outputs, see
Signal Types and Rates on page 4.
BNC
Connector
(4)
Mixer
(4)
16 x 1
MUX DB25
Connector
(1)
One
Crosspoint
Card
(Slot determines
signals forwarded
to output card)
Output Card
Digital to
Analog
Converter