NVision NV8288, Руководство пользователя

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NV8288 and NV8288-Plus Digital Video Routers • User’s Guide 19
2. Introduction
Active Cards
local 2×1 Mux, which in turn feeds the signals to one of 6 reclockers. The reclocker creates two
copies of the input, feeding one output to a cable driver and one output to a 6×1 MUX. The cable
driver forwards the output to the coaxial connector to distribute outgoing signals. The Mux sends
the output to the motherboard, which in turns forwards the signal to the monitor cardset for moni-
toring.
Standard output cards on the local router and standard output cards on the connected router “mir-
ror” each other, performing identical tasks. To illustrate, the standard output cards receive and dis-
tribute signals as follows, where Router 1 is the local router and Router 2 is the connected router:
• Router 1 receives 6 signals from the top crosspoint card (one copy of the local input). These
signals are sent to both the monitor cardset and to coaxial connectors as outgoing signals
• Router 1 receives 6 signals from the bottom crosspoint card (one copy of the local input). These
signals are sent to the expansion connections and forwarded to Router 2.
• Router 1 receives 6 signals from Router 2 through the expansion connections.
• At the same time, Router 2 performs the exact same tasks Router 1 is performing.
Figure 2-18 shows the flow of a signal through the standard output card. For signal re-clocking
rates, see
Signal Rates and Flow on page 4.
Figure 2-18. Standard 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 the output card indicate the card’s status: alarm (Red), power good (Green),
FPGA loaded (Amber), good communication with the control card (Green) and bad communication
with the control card (Red). For more information, see
Indicator LEDs on page 56.
Monitor Card Set
A monitor cardset (EM0546), composed of two cards, 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 outgoing signal quality.
There are two monitor connections: one for SD signals and one for SWB signals. Using UniConfig,
you can set up a SD level and a SWB level and monitor both simultaneously through the control
system. For more information on setting up levels, see the UniConfig User’s Guide.
Motherboard
(6)
Re-clocker
Cable
Driver
Top Crosspoint
Card
6 x 1 Mux
Coaxial
Connector
(6)
Monitor
Outgoing Signal
Expansion
Cable
Connector
(6)
Output to
Expansion Cable
From Expansion
Cable
Cable
Receiver
2 x 1 Mux
Bottom Crosspoint
Card
Motherboard
(6)
Cable
Driver