Grass Valley NV8256-Plus v.1.2 - Manual (Page 31)

NV8256-Plus Digital Video Router • User’s Guide 21
2. Introduction
Active Cards
Figure 2-17 shows the signal flow for the standard output card.
Figure 2-17. Standard Output Card Block Diagram
SD-to-Analog Output Card
A SD-to-analog output card (EM0452) converts SMPTE 259M-C (4:2:2, 270
Mb/s) digital compo-
nent signals to PAL or NTSC composite video analog. Each output card receives 16 digital signals
from local crosspoint cards and distributes outgoing analog signals to coaxial connectors.
The SD-to-analog output cards perform the same functions as the standard output card, with one
exception: Instead of the 3×1 MUX sending the selected signal to a re-clocker, the 3×1 MUX for-
wards two copies of the signal. One copy is fed to a digital-to-analog converter, which converts the
signal to analog. The signal is then forwarded to a composite video encoder and an analog cable
driver, which sends the signals to a coaxial connector that distributes outgoing signals. The other
copy is sent to 16×1 MUX. The 16×1 MUX sends the output to the motherboard, which in turns
forwards the output to the monitor card for monitoring.
Figure 2-18 shows the signal flow for the SD-to-analog output card.
Figure 2-18. SD-to-Analog Output Card Block Diagram
Monitor Card
A monitor card receives one signal from each output card and then sends two outgoing signals.
These outgoing signals can be sent to monitoring equipment for the purpose of monitoring outgo-
ing signal quality. There are two monitoring cards available: one for SWB signals (1143408) and
one for 3Gig signals (EM0633).
The SWB monitor card receives video signal rates of 270 Mb/s and 1.5 Gb/s. The 3Gig monitor
card receives video signal rate of 270 Mb/s, 1.5 Gb/s and 3.0 Gb/s. All other rates pass through.
There are two monitor connections. Using UniConfig, each connection can correspond to a unique
signal level, enabling the control system to monitor two signal rates at the same time. For more
information on levels, see the UniConfig User’s Guide.
Motherboard
Re-clocker
Cable
Driver
16 x 1 Mux
Coaxial
Connectors
(16)
Monitor
Card
3 x 1
Mux
Crosspoint
Card
(16)
Crosspoint
Card
(16)
Crosspoint
Card
(16)
Motherboard
D/A
Con-
verter
Analog
Cable
Driver
16 x 1 Mux
Coaxial
Connectors
(16)
Monitor
3 x 1
Mux
Crosspoint
Card
(16)
Compo-
site
Video
Encoder