Grass Valley NV8500 Series v.3.5 - Manual (Page 79)

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Crosspoints
The crosspoint cards of the router form the switching matrix of the router.
These are the video matrix sizes for standard routers:
NV8144 144×144
NV8140 144×288
NV8280 288×576
NV8576 576×1152
NV8576-Plus, stand-alone 576×576
NV8576-Plus, expanded 1152×1152.
The router matrix is distributed across one or more crosspoint cards.
Hybrid routers have the same video crosspoint matrix as do standard routers, and additionally a
audio “matrix” for switching synchronous audio. The audio “matrix” can be as large as
18432×18432.
Hybrid I/O does not use the entire port space of the router. Some ports in the space go unused.
The crosspoint card(s) receive signals from input cards and switch the signals to the appropriate
output cards as directed by the router’s control card.
Standard crosspoint cards can be used only with standard I/O cards. Hybrid crosspoint cards can
be used with both hybrid I/O cards and standard I/O cards. If the router has at least one hybrid
card, all crosspoint cards must also be hybrid and the control cards must be hybrid. A frame can
only have one type of crosspoint installed, either all standard or all hybrid.
For a list of crosspoint cards available and their part numbers, see Crosspoint Cards on page 218.
Topics
Overview of Crosspoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Installing Crosspoint Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Redundant Crosspoint Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Null Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Pass-Through Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Switching Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Overview of Crosspoints
The NV8144 has two slots for crosspoint cards: one active and one stand-by. All signals pass
through the active crosspoint card. The active crosspoint card switches all inputs to all outputs.
The stand-by crosspoint card takes over switching should the active crosspoint card fail.
The NV8140 has 3 slots for crosspoint cards: two primary and one redundant for backup. The
redundant card occupies the middle crosspoint card slot. All signals pass through the active
crosspoint cards. Together, the crosspoint cards switch any input to any output. One of the cros-
spoint cards targets the upper 9 outputs of output cards. The other crosspoint card targets the