Grass Valley NV8500 Series v.3.5 - Manual (Page 82)

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Crosspoints
Overview of Crosspoints
NV8140
An NV8140 has slots for two normal crosspoint cards and a redundant crosspoint card. Both
crosspoint cards and the redundant crosspoint card receive all inputs. The redundant crosspoint
card is in stand-by mode; it does nothing unless one of the normal crosspoints fails.
The active crosspoint cards send their outputs to the output cards.
If fail-over is automatic and an active card fails, the NV8140’s control card causes the redundant
card to take over for the failed active card. When the redundant card becomes active, it sends its
outputs to the output cards.
The redundant crosspoint is installed in the middle crosspoint slot:
NV8280
In an NV8280, the router’s switching matrix is distributed across 8 crosspoint cards. Each card
switches a specific subset of the inputs or outputs. Crosspoint cards are installed in crosspoint
slots 1–4 and 7–10. The optional redundant crosspoint module is installed in slots 5 and 6:
Fig. 3-1: NV8280 (Front View)
FAN
INPUTS
1–144
(8 cards)
SEC. CONTROL PRIM. CONTROL
(16 cards)
RED. XPT
XPT
B
POWER SUPPLY POWER SUPPLY
OUTPUTS
1–288
XPT
A
Inputs 1–144 are received by crosspoint
cards A and B.
Crosspoint card A distributes the upper 9
outputs of all the output cards. (Those are
outputs 1–9, 19–27, and so on.)
Crosspoint card B distributes the lower 9
outputs of all the output cards. (Those are
outputs 10–18, 28–36, and so on.)
INPUTS 145–288 INPUTS 145–288
INPUTS 1–144 INPUTS 1–144 INPUTS 1–144 INPUTS 1–144
FAN
INPUTS
1–144
INPUT MONITOR
(16 cards)
OUTPUTS
1–288
OUTPUTS
289–576 OUTPUT MONITOR
(16 cards)
INPUTS
145–288
(16 cards)
SECONDARY CONTROL
CROSSPOINT CARDS
INPUTS 145–288 INPUTS 145–288 REDUNDANT CROSSPOINT
(16 cards)
OUTPUTS 289–576
1 2 3 4 7 8 9 10 5, 6
OUTPUTS 1–288
PRIMARY CONTROL
Inputs 1–144 are received by
crosspoint cards 1, 2, 7, and 8.
Inputs 145–288 are received by
crosspoint cards 3, 4, 9, and 10.
Outputs 1–288 are distributed
by crosspoint cards 1–4.
Outputs 289–576 are distributed
by crosspoint cards 7–10.