How frame expansion works, Introduction – Grass Valley NV7512 v.1.3 User Manual
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Rev 1.3 • 10 Oct 08
1. Introduction
Frame Expansion
How Frame Expansion Works
Each NV7512 router frame can manage up to 512 inputs x 512 outputs (AES synchronous unbal-
anced). Every set of four output cards requires one crosspoint card. On the crosspoint card, memory
is divided into four segments, one for the local inputs and three for signals received from connected
router frames. For example, one segment of memory is used for Router 1, the current frame, the
next segment is used for connected Router 2, the next segment for connected Router 3, and so on.
Each frame can contain up to 16 input cards and 16 output cards, and up to four crosspoint cards.
When another frame is added that also contains 512 x 512, each crosspoint card has one expansion
output cable and one expansion input cable connected from every frame to every other frame.
To connect multiple frames, the following connections need to be made:
• I/O Signals
—
Each frame has 24 signal expansion connections, each forwarding up to 512 ste-
reo or 1,024 mono input signals. Connections are made between each connected router. See
• Router Control System
—
One router is connected directly to the router control system. Using
control system expansion connections, control system connections are made between the con-
nected routers. This enables the router control system to communicate with all routers through
one router control system connection. See
Router Control System Expansion Connections
Depending on your switching configuration, each frame may have one, two, three or four cross-
point cards, up to 16 input cards, and up to 16 output cards. For more information about switching
configurations, see
Figure 1-24
shows the flow of signals between four connected routers. The signals are forwarded to
the connected router through signal expansion connections.
Figure 1-24. Frame Expansion Diagram
Router 1
Router 2
Router 3
Router 4